ha_innodb.cc 178 KB
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/* Copyright (C) 2000 MySQL AB & Innobase Oy
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   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
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   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
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   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */

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/* This file defines the InnoDB handler: the interface between MySQL and
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InnoDB
NOTE: You can only use noninlined InnoDB functions in this file, because we
have disables the InnoDB inlining in this file. */
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/* TODO list for the InnoDB handler in 4.1:
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  - Remove the flag innodb_active_trans from thd and replace it with a
    function call innodb_active_trans(thd), which looks at the InnoDB
    trx struct state field
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  - Find out what kind of problems the OS X case-insensitivity causes to
    table and database names; should we 'normalize' the names like we do
    in Windows?
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*/
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#ifdef __GNUC__
#pragma implementation				// gcc: Class implementation
#endif

#include "mysql_priv.h"
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#include "slave.h"
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#ifdef HAVE_INNOBASE_DB
#include <m_ctype.h>
#include <hash.h>
#include <myisampack.h>
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#include <mysys_err.h>
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#include <my_sys.h>
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#define MAX_ULONG_BIT ((ulong) 1 << (sizeof(ulong)*8-1))

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#include "ha_innodb.h"
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pthread_mutex_t innobase_mutex;
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bool innodb_inited= 0;
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/* Store MySQL definition of 'byte': in Linux it is char while InnoDB
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uses unsigned char; the header univ.i which we include next defines
'byte' as a macro which expands to 'unsigned char' */

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typedef byte	mysql_byte;
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#define INSIDE_HA_INNOBASE_CC

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/* Include necessary InnoDB headers */
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extern "C" {
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#include "../innobase/include/univ.i"
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#include "../innobase/include/os0file.h"
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#include "../innobase/include/os0thread.h"
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#include "../innobase/include/srv0start.h"
#include "../innobase/include/srv0srv.h"
#include "../innobase/include/trx0roll.h"
#include "../innobase/include/trx0trx.h"
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#include "../innobase/include/trx0sys.h"
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#include "../innobase/include/mtr0mtr.h"
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#include "../innobase/include/row0ins.h"
#include "../innobase/include/row0mysql.h"
#include "../innobase/include/row0sel.h"
#include "../innobase/include/row0upd.h"
#include "../innobase/include/log0log.h"
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#include "../innobase/include/lock0lock.h"
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#include "../innobase/include/dict0crea.h"
#include "../innobase/include/btr0cur.h"
#include "../innobase/include/btr0btr.h"
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#include "../innobase/include/fsp0fsp.h"
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#include "../innobase/include/sync0sync.h"
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#include "../innobase/include/fil0fil.h"
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#include "../innobase/include/trx0xa.h"
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}

#define HA_INNOBASE_ROWS_IN_TABLE 10000 /* to get optimization right */
#define HA_INNOBASE_RANGE_COUNT	  100

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uint 	innobase_init_flags 	= 0;
ulong 	innobase_cache_size 	= 0;
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ulong 	innobase_large_page_size = 0;
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/* The default values for the following, type long, start-up parameters
are declared in mysqld.cc: */

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long innobase_mirrored_log_groups, innobase_log_files_in_group,
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     innobase_log_file_size, innobase_log_buffer_size,
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     innobase_buffer_pool_awe_mem_mb,
     innobase_buffer_pool_size, innobase_additional_mem_pool_size,
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     innobase_file_io_threads, innobase_lock_wait_timeout,
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     innobase_thread_concurrency, innobase_force_recovery,
     innobase_open_files;
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/* The default values for the following char* start-up parameters
are determined in innobase_init below: */
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char*	innobase_data_home_dir			= NULL;
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char*	innobase_data_file_path 		= NULL;
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char*	innobase_log_group_home_dir		= NULL;
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char*	innobase_log_arch_dir			= NULL;/* unused */
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/* The following has a misleading name: starting from 4.0.5, this also
affects Windows: */
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char*	innobase_unix_file_flush_method		= NULL;

/* Below we have boolean-valued start-up parameters, and their default
values */

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uint	innobase_flush_log_at_trx_commit	= 1;
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my_bool innobase_log_archive			= FALSE;/* unused */
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my_bool innobase_use_doublewrite    = TRUE;
my_bool innobase_use_checksums      = TRUE;
my_bool innobase_use_large_pages    = FALSE;
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my_bool	innobase_use_native_aio			= FALSE;
my_bool	innobase_fast_shutdown			= TRUE;
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my_bool innobase_very_fast_shutdown		= FALSE; /* this can be set to
							 1 just prior calling
							 innobase_end() */
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my_bool	innobase_file_per_table			= FALSE;
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my_bool innobase_locks_unsafe_for_binlog        = FALSE;
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my_bool innobase_create_status_file		= FALSE;
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static char *internal_innobase_data_file_path	= NULL;
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/* The following counter is used to convey information to InnoDB
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about server activity: in selects it is not sensible to call
srv_active_wake_master_thread after each fetch or search, we only do
it every INNOBASE_WAKE_INTERVAL'th step. */

#define INNOBASE_WAKE_INTERVAL	32
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ulong	innobase_active_counter	= 0;
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char*	innobase_home 	= NULL;

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char    innodb_dummy_stmt_trx_handle = 'D';

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static HASH 	innobase_open_tables;
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#ifdef __NETWARE__  	/* some special cleanup for NetWare */
bool nw_panic = FALSE;
#endif

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static mysql_byte* innobase_get_key(INNOBASE_SHARE *share,uint *length,
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			      my_bool not_used __attribute__((unused)));
static INNOBASE_SHARE *get_share(const char *table_name);
static void free_share(INNOBASE_SHARE *share);

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/*********************************************************************
Commits a transaction in an InnoDB database. */

void
innobase_commit_low(
/*================*/
	trx_t*	trx);	/* in: transaction handle */

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struct show_var_st innodb_status_variables[]= {
  {"buffer_pool_pages_data",
  (char*) &export_vars.innodb_buffer_pool_pages_data,     SHOW_LONG},
  {"buffer_pool_pages_dirty",
  (char*) &export_vars.innodb_buffer_pool_pages_dirty,    SHOW_LONG},
  {"buffer_pool_pages_flushed",
  (char*) &export_vars.innodb_buffer_pool_pages_flushed,  SHOW_LONG},
  {"buffer_pool_pages_free",
  (char*) &export_vars.innodb_buffer_pool_pages_free,     SHOW_LONG},
  {"buffer_pool_pages_latched",
  (char*) &export_vars.innodb_buffer_pool_pages_latched,  SHOW_LONG},
  {"buffer_pool_pages_misc",
  (char*) &export_vars.innodb_buffer_pool_pages_misc,     SHOW_LONG},
  {"buffer_pool_pages_total",
  (char*) &export_vars.innodb_buffer_pool_pages_total,    SHOW_LONG},
  {"buffer_pool_read_ahead_rnd",
  (char*) &export_vars.innodb_buffer_pool_read_ahead_rnd, SHOW_LONG},
  {"buffer_pool_read_ahead_seq",
  (char*) &export_vars.innodb_buffer_pool_read_ahead_seq, SHOW_LONG},
  {"buffer_pool_read_requests",
  (char*) &export_vars.innodb_buffer_pool_read_requests,  SHOW_LONG},
  {"buffer_pool_reads",
  (char*) &export_vars.innodb_buffer_pool_reads,          SHOW_LONG},
  {"buffer_pool_wait_free",
  (char*) &export_vars.innodb_buffer_pool_wait_free,      SHOW_LONG},
  {"buffer_pool_write_requests",
  (char*) &export_vars.innodb_buffer_pool_write_requests, SHOW_LONG},
  {"data_fsyncs",
  (char*) &export_vars.innodb_data_fsyncs,                SHOW_LONG},
  {"data_pending_fsyncs",
  (char*) &export_vars.innodb_data_pending_fsyncs,        SHOW_LONG},
  {"data_pending_reads",
  (char*) &export_vars.innodb_data_pending_reads,         SHOW_LONG},
  {"data_pending_writes",
  (char*) &export_vars.innodb_data_pending_writes,        SHOW_LONG},
  {"data_read",
  (char*) &export_vars.innodb_data_read,                  SHOW_LONG},
  {"data_reads",
  (char*) &export_vars.innodb_data_reads,                 SHOW_LONG},
  {"data_writes",
  (char*) &export_vars.innodb_data_writes,                SHOW_LONG},
  {"data_written",
  (char*) &export_vars.innodb_data_written,               SHOW_LONG},
  {"dblwr_pages_written",
  (char*) &export_vars.innodb_dblwr_pages_written,        SHOW_LONG},
  {"dblwr_writes",
  (char*) &export_vars.innodb_dblwr_writes,               SHOW_LONG},
  {"log_waits",
  (char*) &export_vars.innodb_log_waits,                  SHOW_LONG},
  {"log_write_requests",
  (char*) &export_vars.innodb_log_write_requests,         SHOW_LONG},
  {"log_writes",
  (char*) &export_vars.innodb_log_writes,                 SHOW_LONG},
  {"os_log_fsyncs",
  (char*) &export_vars.innodb_os_log_fsyncs,              SHOW_LONG},
  {"os_log_pending_fsyncs",
  (char*) &export_vars.innodb_os_log_pending_fsyncs,      SHOW_LONG},
  {"os_log_pending_writes",
  (char*) &export_vars.innodb_os_log_pending_writes,      SHOW_LONG},
  {"os_log_written",
  (char*) &export_vars.innodb_os_log_written,             SHOW_LONG},
  {"page_size",
  (char*) &export_vars.innodb_page_size,                  SHOW_LONG},
  {"pages_created",
  (char*) &export_vars.innodb_pages_created,              SHOW_LONG},
  {"pages_read",
  (char*) &export_vars.innodb_pages_read,                 SHOW_LONG},
  {"pages_written",
  (char*) &export_vars.innodb_pages_written,              SHOW_LONG},
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  {"row_lock_waits",
  (char*) &export_vars.innodb_row_lock_waits,             SHOW_LONG},
  {"row_lock_current_waits",
  (char*) &export_vars.innodb_row_lock_current_waits,     SHOW_LONG},
  {"row_lock_time",
  (char*) &export_vars.innodb_row_lock_time,              SHOW_LONGLONG},
  {"row_lock_time_max",
  (char*) &export_vars.innodb_row_lock_time_max,          SHOW_LONG},
  {"row_lock_time_avg",
  (char*) &export_vars.innodb_row_lock_time_avg,          SHOW_LONG},
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  {"rows_deleted",
  (char*) &export_vars.innodb_rows_deleted,               SHOW_LONG},
  {"rows_inserted",
  (char*) &export_vars.innodb_rows_inserted,              SHOW_LONG},
  {"rows_read",
  (char*) &export_vars.innodb_rows_read,                  SHOW_LONG},
  {"rows_updated",
  (char*) &export_vars.innodb_rows_updated,               SHOW_LONG},
  {NullS, NullS, SHOW_LONG}};
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/* General functions */

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/**********************************************************************
Save some CPU by testing the value of srv_thread_concurrency in inline
functions. */
inline
void
innodb_srv_conc_enter_innodb(
/*=========================*/
	trx_t*	trx)	/* in: transaction handle */
{
	if (srv_thread_concurrency >= 500) {

		return;
	}

	srv_conc_enter_innodb(trx);
}

/**********************************************************************
Save some CPU by testing the value of srv_thread_concurrency in inline
functions. */
inline
void
innodb_srv_conc_exit_innodb(
/*========================*/
	trx_t*	trx)	/* in: transaction handle */
{
	if (srv_thread_concurrency >= 500) {

		return;
	}

	srv_conc_exit_innodb(trx);
}

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/**********************************************************************
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Releases possible search latch and InnoDB thread FIFO ticket. These should
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be released at each SQL statement end, and also when mysqld passes the
control to the client. It does no harm to release these also in the middle
of an SQL statement. */
inline
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void
innobase_release_stat_resources(
/*============================*/
	trx_t*	trx)	/* in: transaction object */
{
	if (trx->has_search_latch) {
		trx_search_latch_release_if_reserved(trx);
	}

	if (trx->declared_to_be_inside_innodb) {
		/* Release our possible ticket in the FIFO */

		srv_conc_force_exit_innodb(trx);
	}
}

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/************************************************************************
Call this function when mysqld passes control to the client. That is to
avoid deadlocks on the adaptive hash S-latch possibly held by thd. For more
documentation, see handler.cc. */

void
innobase_release_temporary_latches(
/*===============================*/
        void*   innobase_tid)
{
        innobase_release_stat_resources((trx_t*)innobase_tid);
}

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/************************************************************************
Increments innobase_active_counter and every INNOBASE_WAKE_INTERVALth
time calls srv_active_wake_master_thread. This function should be used
when a single database operation may introduce a small need for
server utility activity, like checkpointing. */
inline
void
innobase_active_small(void)
/*=======================*/
{
	innobase_active_counter++;

	if ((innobase_active_counter % INNOBASE_WAKE_INTERVAL) == 0) {
		srv_active_wake_master_thread();
	}
}

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/************************************************************************
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Converts an InnoDB error code to a MySQL error code and also tells to MySQL
about a possible transaction rollback inside InnoDB caused by a lock wait
timeout or a deadlock. */
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static
int
convert_error_code_to_mysql(
/*========================*/
			/* out: MySQL error code */
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	int	error,	/* in: InnoDB error code */
	THD*	thd)	/* in: user thread handle or NULL */
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{
	if (error == DB_SUCCESS) {

		return(0);

  	} else if (error == (int) DB_DUPLICATE_KEY) {

    		return(HA_ERR_FOUND_DUPP_KEY);

 	} else if (error == (int) DB_RECORD_NOT_FOUND) {

    		return(HA_ERR_NO_ACTIVE_RECORD);

 	} else if (error == (int) DB_ERROR) {

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    		return(-1); /* unspecified error */
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 	} else if (error == (int) DB_DEADLOCK) {
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 		/* Since we rolled back the whole transaction, we must
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 		tell it also to MySQL so that MySQL knows to empty the
 		cached binlog for this transaction */

 		if (thd) {
 			ha_rollback(thd);
 		}
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    		return(HA_ERR_LOCK_DEADLOCK);

 	} else if (error == (int) DB_LOCK_WAIT_TIMEOUT) {

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		/* Since we rolled back the whole transaction, we must
		tell it also to MySQL so that MySQL knows to empty the
		cached binlog for this transaction */
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		if (thd) {
			ha_rollback(thd);
		}
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   		return(HA_ERR_LOCK_WAIT_TIMEOUT);
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 	} else if (error == (int) DB_NO_REFERENCED_ROW) {

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    		return(HA_ERR_NO_REFERENCED_ROW);
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 	} else if (error == (int) DB_ROW_IS_REFERENCED) {

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    		return(HA_ERR_ROW_IS_REFERENCED);
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        } else if (error == (int) DB_CANNOT_ADD_CONSTRAINT) {
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    		return(HA_ERR_CANNOT_ADD_FOREIGN);
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        } else if (error == (int) DB_CANNOT_DROP_CONSTRAINT) {

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    		return(HA_ERR_ROW_IS_REFERENCED); /* TODO: This is a bit
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						misleading, a new MySQL error
						code should be introduced */
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        } else if (error == (int) DB_COL_APPEARS_TWICE_IN_INDEX) {

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    		return(HA_ERR_CRASHED);
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 	} else if (error == (int) DB_OUT_OF_FILE_SPACE) {

    		return(HA_ERR_RECORD_FILE_FULL);

 	} else if (error == (int) DB_TABLE_IS_BEING_USED) {

    		return(HA_ERR_WRONG_COMMAND);

 	} else if (error == (int) DB_TABLE_NOT_FOUND) {

    		return(HA_ERR_KEY_NOT_FOUND);

  	} else if (error == (int) DB_TOO_BIG_RECORD) {

    		return(HA_ERR_TO_BIG_ROW);
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  	} else if (error == (int) DB_CORRUPTION) {

    		return(HA_ERR_CRASHED);
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  	} else if (error == (int) DB_NO_SAVEPOINT) {

    		return(HA_ERR_NO_SAVEPOINT);
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  	} else if (error == (int) DB_LOCK_TABLE_FULL) {

    		return(HA_ERR_LOCK_TABLE_FULL);
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    	} else {
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    		return(-1);			// Unknown error
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    	}
}

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/*****************************************************************
If you want to print a thd that is not associated with the current thread,
you must call this function before reserving the InnoDB kernel_mutex, to
protect MySQL from setting thd->query NULL. If you print a thd of the current
thread, we know that MySQL cannot modify thd->query, and it is not necessary
to call this. Call innobase_mysql_end_print_arbitrary_thd() after you release
the kernel_mutex.
NOTE that /mysql/innobase/lock/lock0lock.c must contain the prototype for this
function! */
extern "C"
void
innobase_mysql_prepare_print_arbitrary_thd(void)
/*============================================*/
{
	VOID(pthread_mutex_lock(&LOCK_thread_count));
}

/*****************************************************************
Relases the mutex reserved by innobase_mysql_prepare_print_arbitrary_thd().
NOTE that /mysql/innobase/lock/lock0lock.c must contain the prototype for this
function! */
extern "C"
void
innobase_mysql_end_print_arbitrary_thd(void)
/*========================================*/
{
	VOID(pthread_mutex_unlock(&LOCK_thread_count));
}

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/*****************************************************************
Prints info of a THD object (== user session thread) to the
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standard output. NOTE that /mysql/innobase/trx/trx0trx.c must contain
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the prototype for this function! */
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extern "C"
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void
innobase_mysql_print_thd(
/*=====================*/
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	FILE*   f,	/* in: output stream */
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        void*   input_thd)/* in: pointer to a MySQL THD object */
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{
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	const THD*	thd;
	const char*	s;
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	char		buf[301];
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        thd = (const THD*) input_thd;
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  	fprintf(f, "MySQL thread id %lu, query id %lu",
		thd->thread_id, thd->query_id);
	if (thd->host) {
		putc(' ', f);
		fputs(thd->host, f);
	}
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	if (thd->ip) {
		putc(' ', f);
		fputs(thd->ip, f);
	}
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  	if (thd->user) {
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		putc(' ', f);
		fputs(thd->user, f);
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  	}

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	if ((s = thd->proc_info)) {
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		putc(' ', f);
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		fputs(s, f);
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	}
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	if ((s = thd->query)) {
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		/* determine the length of the query string */
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		uint32 i, len;
		
		len = thd->query_length;

		if (len > 300) {
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			len = 300;	/* ADDITIONAL SAFETY: print at most
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					300 chars to reduce the probability of
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					a seg fault if there is a race in
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					thd->query_length in MySQL; after
					May 14, 2004 probably no race any more,
					but better be safe */
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		}
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                /* Use strmake to reduce the timeframe
                   for a race, compared to fwrite() */
		i= (uint) (strmake(buf, s, len) - buf);
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		putc('\n', f);
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		fwrite(buf, 1, i, f);
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	}
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	putc('\n', f);
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}

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/**********************************************************************
Determines whether the given character set is of variable length.

NOTE that the exact prototype of this function has to be in
/innobase/data/data0type.ic! */
extern "C"
ibool
innobase_is_mb_cset(
/*================*/
	ulint	cset)	/* in: MySQL charset-collation code */
{
	CHARSET_INFO*	cs;
	ut_ad(cset < 256);

	cs = all_charsets[cset];

	return(cs && cs->mbminlen != cs->mbmaxlen);
}

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/**********************************************************************
Compares NUL-terminated UTF-8 strings case insensitively.

NOTE that the exact prototype of this function has to be in
/innobase/dict/dict0dict.c! */
extern "C"
int
innobase_strcasecmp(
/*================*/
				/* out: 0 if a=b, <0 if a<b, >1 if a>b */
	const char*	a,	/* in: first string to compare */
	const char*	b)	/* in: second string to compare */
{
	return(my_strcasecmp(system_charset_info, a, b));
}

/**********************************************************************
Makes all characters in a NUL-terminated UTF-8 string lower case.

NOTE that the exact prototype of this function has to be in
/innobase/dict/dict0dict.c! */
extern "C"
void
innobase_casedn_str(
/*================*/
	char*	a)	/* in/out: string to put in lower case */
{
	my_casedn_str(system_charset_info, a);
}

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/*************************************************************************
Creates a temporary file. */
extern "C"
int
innobase_mysql_tmpfile(void)
/*========================*/
			/* out: temporary file descriptor, or < 0 on error */
{
	char	filename[FN_REFLEN];
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	int	fd2 = -1;
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	File	fd = create_temp_file(filename, NullS, "ib",
#ifdef __WIN__
				O_BINARY | O_TRUNC | O_SEQUENTIAL |
				O_TEMPORARY | O_SHORT_LIVED |
#endif /* __WIN__ */
				O_CREAT | O_EXCL | O_RDWR,
				MYF(MY_WME));
	if (fd >= 0) {
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#ifndef __WIN__
		/* On Windows, open files cannot be removed, but files can be
		created with the O_TEMPORARY flag to the same effect
		("delete on close"). */
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		unlink(filename);
#endif /* !__WIN__ */
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		/* Copy the file descriptor, so that the additional resources
		allocated by create_temp_file() can be freed by invoking
		my_close().

		Because the file descriptor returned by this function
		will be passed to fdopen(), it will be closed by invoking
		fclose(), which in turn will invoke close() instead of
		my_close(). */
		fd2 = dup(fd);
		if (fd2 < 0) {
			DBUG_PRINT("error",("Got error %d on dup",fd2));
			my_errno=errno;
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                        my_error(EE_OUT_OF_FILERESOURCES,
                                 MYF(ME_BELL+ME_WAITTANG),
                                 filename, my_errno);
                }
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		my_close(fd, MYF(MY_WME));
	}
	return(fd2);
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}

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/*************************************************************************
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Gets the InnoDB transaction handle for a MySQL handler object, creates
an InnoDB transaction struct if the corresponding MySQL thread struct still
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lacks one. */
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static
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trx_t*
check_trx_exists(
/*=============*/
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			/* out: InnoDB transaction handle */
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	THD*	thd)	/* in: user thread handle */
{
	trx_t*	trx;

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	ut_ad(thd == current_thd);
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	trx = (trx_t*) thd->transaction.all.innobase_tid;
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	if (trx == NULL) {
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	        DBUG_ASSERT(thd != NULL);
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		trx = trx_allocate_for_mysql();
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		trx->mysql_thd = thd;
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		trx->mysql_query_str = &((*thd).query);
		
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		thd->transaction.all.innobase_tid = trx;
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		/* The execution of a single SQL statement is denoted by
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		a 'transaction' handle which is a dummy pointer: InnoDB
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		remembers internally where the latest SQL statement
		started, and if error handling requires rolling back the
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		latest statement, InnoDB does a rollback to a savepoint. */
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		thd->transaction.stmt.innobase_tid =
		                  (void*)&innodb_dummy_stmt_trx_handle;
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	} else {
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		if (trx->magic_n != TRX_MAGIC_N) {
			mem_analyze_corruption((byte*)trx);

			ut_a(0);
		}
	}

	if (thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
		trx->check_foreigns = FALSE;
	} else {
		trx->check_foreigns = TRUE;
	}

	if (thd->options & OPTION_RELAXED_UNIQUE_CHECKS) {
		trx->check_unique_secondary = FALSE;
	} else {
		trx->check_unique_secondary = TRUE;
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	}

	return(trx);
}

/*************************************************************************
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Updates the user_thd field in a handle and also allocates a new InnoDB
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transaction handle if needed, and updates the transaction fields in the
prebuilt struct. */
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inline
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int
ha_innobase::update_thd(
/*====================*/
			/* out: 0 or error code */
	THD*	thd)	/* in: thd to use the handle */
{
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	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	trx_t*		trx;
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	trx = check_trx_exists(thd);

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	if (prebuilt->trx != trx) {
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		row_update_prebuilt_trx(prebuilt, trx);
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	}

	user_thd = thd;
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	return(0);
}

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/*   BACKGROUND INFO: HOW THE MYSQL QUERY CACHE WORKS WITH INNODB
     ------------------------------------------------------------

1) The use of the query cache for TBL is disabled when there is an
uncommitted change to TBL.

2) When a change to TBL commits, InnoDB stores the current value of
its global trx id counter, let us denote it by INV_TRX_ID, to the table object
in the InnoDB data dictionary, and does only allow such transactions whose
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id <= INV_TRX_ID to use the query cache.
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3) When InnoDB does an INSERT/DELETE/UPDATE to a table TBL, or an implicit
modification because an ON DELETE CASCADE, we invalidate the MySQL query cache
of TBL immediately.

How this is implemented inside InnoDB:

1) Since every modification always sets an IX type table lock on the InnoDB
table, it is easy to check if there can be uncommitted modifications for a
table: just check if there are locks in the lock list of the table.

2) When a transaction inside InnoDB commits, it reads the global trx id
counter and stores the value INV_TRX_ID to the tables on which it had a lock.

3) If there is an implicit table change from ON DELETE CASCADE or SET NULL,
InnoDB calls an invalidate method for the MySQL query cache for that table.

How this is implemented inside sql_cache.cc:

1) The query cache for an InnoDB table TBL is invalidated immediately at an
INSERT/UPDATE/DELETE, just like in the case of MyISAM. No need to delay
invalidation to the transaction commit.

2) To store or retrieve a value from the query cache of an InnoDB table TBL,
any query must first ask InnoDB's permission. We must pass the thd as a
parameter because InnoDB will look at the trx id, if any, associated with
that thd.

3) Use of the query cache for InnoDB tables is now allowed also when
AUTOCOMMIT==0 or we are inside BEGIN ... COMMIT. Thus transactions no longer
put restrictions on the use of the query cache.
*/

/**********************************************************************
The MySQL query cache uses this to check from InnoDB if the query cache at
the moment is allowed to operate on an InnoDB table. The SQL query must
be a non-locking SELECT.

The query cache is allowed to operate on certain query only if this function
returns TRUE for all tables in the query.

If thd is not in the autocommit state, this function also starts a new
transaction for thd if there is no active trx yet, and assigns a consistent
read view to it if there is no read view yet. */

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my_bool
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innobase_query_caching_of_table_permitted(
/*======================================*/
				/* out: TRUE if permitted, FALSE if not;
				note that the value FALSE does not mean
				we should invalidate the query cache:
				invalidation is called explicitly */
	THD*	thd,		/* in: thd of the user who is trying to
				store a result to the query cache or
				retrieve it */
	char*	full_name,	/* in: concatenation of database name,
				the null character '\0', and the table
				name */
	uint	full_name_len)	/* in: length of the full name, i.e.
				len(dbname) + len(tablename) + 1 */
{
	ibool	is_autocommit;
	trx_t*	trx;
	char	norm_name[1000];

	ut_a(full_name_len < 999);

	if (thd->variables.tx_isolation == ISO_SERIALIZABLE) {
		/* In the SERIALIZABLE mode we add LOCK IN SHARE MODE to every
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		plain SELECT if AUTOCOMMIT is not on. */
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		return((my_bool)FALSE);
	}

	trx = (trx_t*) thd->transaction.all.innobase_tid;

	if (trx == NULL) {
		trx = check_trx_exists(thd);
	}

	innobase_release_stat_resources(trx);

	if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {

		is_autocommit = TRUE;
	} else {
		is_autocommit = FALSE;

	}

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	if (is_autocommit && trx->n_mysql_tables_in_use == 0) {
		/* We are going to retrieve the query result from the query
		cache. This cannot be a store operation to the query cache
		because then MySQL would have locks on tables already.

		TODO: if the user has used LOCK TABLES to lock the table,
		then we open a transaction in the call of row_.. below.
		That trx can stay open until UNLOCK TABLES. The same problem
		exists even if we do not use the query cache. MySQL should be
		modified so that it ALWAYS calls some cleanup function when
		the processing of a query ends!

		We can imagine we instantaneously serialize this consistent
		read trx to the current trx id counter. If trx2 would have
		changed the tables of a query result stored in the cache, and
		trx2 would have already committed, making the result obsolete,
		then trx2 would have already invalidated the cache. Thus we
		can trust the result in the cache is ok for this query. */
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		return((my_bool)TRUE);
	}
	
	/* Normalize the table name to InnoDB format */

	memcpy(norm_name, full_name, full_name_len);

	norm_name[strlen(norm_name)] = '/'; /* InnoDB uses '/' as the
					    separator between db and table */
	norm_name[full_name_len] = '\0';
#ifdef __WIN__
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	innobase_casedn_str(norm_name);
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#endif
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	/* The call of row_search_.. will start a new transaction if it is
	not yet started */

	thd->transaction.all.innodb_active_trans = 1;

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	if (row_search_check_if_query_cache_permitted(trx, norm_name)) {

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		/* printf("Query cache for %s permitted\n", norm_name); */
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		return((my_bool)TRUE);
	}

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	/* printf("Query cache for %s NOT permitted\n", norm_name); */
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	return((my_bool)FALSE);
}

/*********************************************************************
Invalidates the MySQL query cache for the table.
NOTE that the exact prototype of this function has to be in
/innobase/row/row0ins.c! */
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extern "C"
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void
innobase_invalidate_query_cache(
/*============================*/
	trx_t*	trx,		/* in: transaction which modifies the table */
	char*	full_name,	/* in: concatenation of database name, null
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				char '\0', table name, null char'\0';
				NOTE that in Windows this is always
				in LOWER CASE! */
	ulint	full_name_len)	/* in: full name length where also the null
				chars count */
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{
	/* Argument TRUE below means we are using transactions */
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#ifdef HAVE_QUERY_CACHE
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	query_cache.invalidate((THD*)(trx->mysql_thd),
					(const char*)full_name,
					(uint32)full_name_len,
					TRUE);
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#endif
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}
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/*********************************************************************
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Get the quote character to be used in SQL identifiers.
This definition must match the one in innobase/ut/ut0ut.c! */
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extern "C"
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int
mysql_get_identifier_quote_char(
/*============================*/
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				/* out: quote character to be
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				used in SQL identifiers; EOF if none */
	trx_t*		trx,	/* in: transaction */
	const char*	name,	/* in: name to print */
	ulint		namelen)/* in: length of name */
{
	if (!trx || !trx->mysql_thd) {
		return(EOF);
	}
	return(get_quote_char_for_identifier((THD*) trx->mysql_thd,
						name, namelen));
}

/**************************************************************************
Obtain a pointer to the MySQL THD object, as in current_thd().  This
definition must match the one in sql/ha_innodb.cc! */
extern "C"
void*
innobase_current_thd(void)
/*======================*/
			/* out: MySQL THD object */
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{
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	return(current_thd);
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}

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/*********************************************************************
Call this when you have opened a new table handle in HANDLER, before you
call index_read_idx() etc. Actually, we can let the cursor stay open even
over a transaction commit! Then you should call this before every operation,
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fetch next etc. This function inits the necessary things even after a
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transaction commit. */

void
ha_innobase::init_table_handle_for_HANDLER(void)
/*============================================*/
{
        row_prebuilt_t* prebuilt;

        /* If current thd does not yet have a trx struct, create one.
        If the current handle does not yet have a prebuilt struct, create
        one. Update the trx pointers in the prebuilt struct. Normally
        this operation is done in external_lock. */

        update_thd(current_thd);

        /* Initialize the prebuilt struct much like it would be inited in
        external_lock */

        prebuilt = (row_prebuilt_t*)innobase_prebuilt;

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	innobase_release_stat_resources(prebuilt->trx);

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        /* If the transaction is not started yet, start it */

        trx_start_if_not_started_noninline(prebuilt->trx);

        /* Assign a read view if the transaction does not have it yet */

        trx_assign_read_view(prebuilt->trx);

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	/* Set the MySQL flag to mark that there is an active transaction */

	current_thd->transaction.all.innodb_active_trans = 1;

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        /* We did the necessary inits in this function, no need to repeat them
        in row_search_for_mysql */

        prebuilt->sql_stat_start = FALSE;

        /* We let HANDLER always to do the reads as consistent reads, even
        if the trx isolation level would have been specified as SERIALIZABLE */

        prebuilt->select_lock_type = LOCK_NONE;
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        prebuilt->stored_select_lock_type = LOCK_NONE;
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        /* Always fetch all columns in the index record */

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        prebuilt->hint_need_to_fetch_extra_cols = ROW_RETRIEVE_ALL_COLS;
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        /* We want always to fetch all columns in the whole row? Or do
	we???? */

        prebuilt->read_just_key = FALSE;
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	prebuilt->used_in_HANDLER = TRUE;
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	prebuilt->keep_other_fields_on_keyread = FALSE;
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}

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/*************************************************************************
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Opens an InnoDB database. */
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bool
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innobase_init(void)
/*===============*/
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			/* out: TRUE if error */
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{
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	static char	current_dir[3];		/* Set if using current lib */
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	int		err;
	bool		ret;
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	char 	        *default_path;
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  	DBUG_ENTER("innobase_init");

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  	os_innodb_umask = (ulint)my_umask;
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	/* First calculate the default path for innodb_data_home_dir etc.,
	in case the user has not given any value.

	Note that when using the embedded server, the datadirectory is not
	necessarily the current directory of this program. */

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	if (mysqld_embedded) {
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		default_path = mysql_real_data_home;
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		fil_path_to_mysql_datadir = mysql_real_data_home;
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	} else {
	  	/* It's better to use current lib, to keep paths short */
	  	current_dir[0] = FN_CURLIB;
	  	current_dir[1] = FN_LIBCHAR;
	  	current_dir[2] = 0;
	  	default_path = current_dir;
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	}

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	ut_a(default_path);

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	if (specialflag & SPECIAL_NO_PRIOR) {
	        srv_set_thread_priorities = FALSE;
	} else {
	        srv_set_thread_priorities = TRUE;
	        srv_query_thread_priority = QUERY_PRIOR;
	}
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	/* Set InnoDB initialization parameters according to the values
	read from MySQL .cnf file */
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	/*--------------- Data files -------------------------*/
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	/* The default dir for data files is the datadir of MySQL */
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	srv_data_home = (innobase_data_home_dir ? innobase_data_home_dir :
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			 default_path);
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	/* Set default InnoDB data file size to 10 MB and let it be
  	auto-extending. Thus users can use InnoDB in >= 4.0 without having
	to specify any startup options. */

	if (!innobase_data_file_path) {
  		innobase_data_file_path = (char*) "ibdata1:10M:autoextend";
	}

	/* Since InnoDB edits the argument in the next call, we make another
	copy of it: */

	internal_innobase_data_file_path = my_strdup(innobase_data_file_path,
						   MYF(MY_WME));

	ret = (bool) srv_parse_data_file_paths_and_sizes(
				internal_innobase_data_file_path,
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				&srv_data_file_names,
				&srv_data_file_sizes,
				&srv_data_file_is_raw_partition,
				&srv_n_data_files,
				&srv_auto_extend_last_data_file,
				&srv_last_file_size_max);
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	if (ret == FALSE) {
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	  	sql_print_error(
			"InnoDB: syntax error in innodb_data_file_path");
	  	DBUG_RETURN(TRUE);
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	}
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	/* -------------- Log files ---------------------------*/

	/* The default dir for log files is the datadir of MySQL */
	
	if (!innobase_log_group_home_dir) {
	  	innobase_log_group_home_dir = default_path;
	}
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#ifdef UNIV_LOG_ARCHIVE	  	
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	/* Since innodb_log_arch_dir has no relevance under MySQL,
	starting from 4.0.6 we always set it the same as
	innodb_log_group_home_dir: */

	innobase_log_arch_dir = innobase_log_group_home_dir;

	srv_arch_dir = innobase_log_arch_dir;
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#endif /* UNIG_LOG_ARCHIVE */
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	ret = (bool)
		srv_parse_log_group_home_dirs(innobase_log_group_home_dir,
						&srv_log_group_home_dirs);
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	if (ret == FALSE || innobase_mirrored_log_groups != 1) {
		fprintf(stderr,
		"InnoDB: syntax error in innodb_log_group_home_dir\n"
		"InnoDB: or a wrong number of mirrored log groups\n");
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		DBUG_RETURN(TRUE);
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	}
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	/* --------------------------------------------------*/

	srv_file_flush_method_str = innobase_unix_file_flush_method;
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	srv_n_log_groups = (ulint) innobase_mirrored_log_groups;
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	srv_n_log_files = (ulint) innobase_log_files_in_group;
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	srv_log_file_size = (ulint) innobase_log_file_size;

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#ifdef UNIV_LOG_ARCHIVE
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	srv_log_archive_on = (ulint) innobase_log_archive;
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#endif /* UNIV_LOG_ARCHIVE */
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	srv_log_buffer_size = (ulint) innobase_log_buffer_size;
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	srv_flush_log_at_trx_commit = (ulint) innobase_flush_log_at_trx_commit;
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        /* We set srv_pool_size here in units of 1 kB. InnoDB internally
        changes the value so that it becomes the number of database pages. */
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        if (innobase_buffer_pool_awe_mem_mb == 0) {
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                /* Careful here: we first convert the signed long int to ulint
                and only after that divide */
 
                srv_pool_size = ((ulint) innobase_buffer_pool_size) / 1024;
        } else {
                srv_use_awe = TRUE;
                srv_pool_size = (ulint)
                                (1024 * innobase_buffer_pool_awe_mem_mb);
                srv_awe_window_size = (ulint) innobase_buffer_pool_size;
 
                /* Note that what the user specified as
                innodb_buffer_pool_size is actually the AWE memory window
                size in this case, and the real buffer pool size is
                determined by .._awe_mem_mb. */
        }
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	srv_mem_pool_size = (ulint) innobase_additional_mem_pool_size;

	srv_n_file_io_threads = (ulint) innobase_file_io_threads;
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	srv_lock_wait_timeout = (ulint) innobase_lock_wait_timeout;
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	srv_force_recovery = (ulint) innobase_force_recovery;

	srv_fast_shutdown = (ibool) innobase_fast_shutdown;
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  srv_use_doublewrite_buf = (ibool) innobase_use_doublewrite;
  srv_use_checksums = (ibool) innobase_use_checksums;

  os_use_large_pages = (ibool) innobase_use_large_pages;
  os_large_page_size = (ulint) innobase_large_page_size;
  
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	srv_file_per_table = (ibool) innobase_file_per_table;
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        srv_locks_unsafe_for_binlog = (ibool) innobase_locks_unsafe_for_binlog;
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	srv_max_n_open_files = (ulint) innobase_open_files;
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	srv_innodb_status = (ibool) innobase_create_status_file;
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	srv_print_verbose_log = mysqld_embedded ? 0 : 1;
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		/* Store the default charset-collation number of this MySQL
	installation */
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	data_mysql_default_charset_coll = (ulint)default_charset_info->number;
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	data_mysql_latin1_swedish_charset_coll =
					(ulint)my_charset_latin1.number;

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	/* Store the latin1_swedish_ci character ordering table to InnoDB. For
	non-latin1_swedish_ci charsets we use the MySQL comparison functions,
	and consequently we do not need to know the ordering internally in
	InnoDB. */
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	ut_a(0 == strcmp((char*)my_charset_latin1.name,
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						(char*)"latin1_swedish_ci"));
	memcpy(srv_latin1_ordering, my_charset_latin1.sort_order, 256);
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	/* Since we in this module access directly the fields of a trx
        struct, and due to different headers and flags it might happen that
	mutex_t has a different size in this module and in InnoDB
	modules, we check at run time that the size is the same in
	these compilation modules. */

	srv_sizeof_trx_t_in_ha_innodb_cc = sizeof(trx_t);

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	err = innobase_start_or_create_for_mysql();
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	if (err != DB_SUCCESS) {

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		DBUG_RETURN(1);
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	}
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	(void) hash_init(&innobase_open_tables,system_charset_info, 32, 0, 0,
			 		(hash_get_key) innobase_get_key, 0, 0);
	pthread_mutex_init(&innobase_mutex, MY_MUTEX_INIT_FAST);
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	innodb_inited= 1;
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	/* If this is a replication slave and we needed to do a crash recovery,
	set the master binlog position to what InnoDB internally knew about
	how far we got transactions durable inside InnoDB. There is a
	problem here: if the user used also MyISAM tables, InnoDB might not
	know the right position for them.

	THIS DOES NOT WORK CURRENTLY because replication seems to initialize
	glob_mi also after innobase_init. */
	
/*	if (trx_sys_mysql_master_log_pos != -1) {
		ut_memcpy(glob_mi.log_file_name, trx_sys_mysql_master_log_name,
				1 + ut_strlen(trx_sys_mysql_master_log_name));
		glob_mi.pos = trx_sys_mysql_master_log_pos;
	}
*/
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  	DBUG_RETURN(0);
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}

/***********************************************************************
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Closes an InnoDB database. */
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bool
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innobase_end(void)
/*==============*/
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				/* out: TRUE if error */
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{
1216
	int	err= 0;
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	DBUG_ENTER("innobase_end");

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#ifdef __NETWARE__ 	/* some special cleanup for NetWare */
	if (nw_panic) {
		set_panic_flag_for_netware();
	}
#endif
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	if (innodb_inited)
	{
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	  if (innobase_very_fast_shutdown) {
	    srv_very_fast_shutdown = TRUE;
	    fprintf(stderr,
"InnoDB: MySQL has requested a very fast shutdown without flushing\n"
"InnoDB: the InnoDB buffer pool to data files. At the next mysqld startup\n"
"InnoDB: InnoDB will do a crash recovery!\n");

	  }

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	  innodb_inited= 0;
	  if (innobase_shutdown_for_mysql() != DB_SUCCESS)
	    err= 1;
	  hash_free(&innobase_open_tables);
	  my_free(internal_innobase_data_file_path,MYF(MY_ALLOW_ZERO_PTR));
	  pthread_mutex_destroy(&innobase_mutex);
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	}
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  	DBUG_RETURN(err);
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}

/********************************************************************
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Flushes InnoDB logs to disk and makes a checkpoint. Really, a commit flushes
the logs, and the name of this function should be innobase_checkpoint. */
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bool
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innobase_flush_logs(void)
/*=====================*/
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				/* out: TRUE if error */
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{
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  	bool 	result = 0;
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  	DBUG_ENTER("innobase_flush_logs");

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	log_buffer_flush_to_disk();
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  	DBUG_RETURN(result);
}

/*********************************************************************
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Commits a transaction in an InnoDB database. */
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void
innobase_commit_low(
/*================*/
	trx_t*	trx)	/* in: transaction handle */
{
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        if (trx->conc_state == TRX_NOT_STARTED) {
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                return;
        }
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#ifdef HAVE_REPLICATION
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        if (current_thd->slave_thread) {
                /* Update the replication position info inside InnoDB */
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                trx->mysql_master_log_file_name
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                                        = active_mi->rli.group_master_log_name;
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                trx->mysql_master_log_pos= ((ib_longlong)
                   			    active_mi->rli.future_group_master_log_pos);
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        }
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#endif /* HAVE_REPLICATION */
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	trx_commit_for_mysql(trx);
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}

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/*********************************************************************
Creates an InnoDB transaction struct for the thd if it does not yet have one.
Starts a new InnoDB transaction if a transaction is not yet started. And
assigns a new snapshot for a consistent read if the transaction does not yet
have one. */

int
innobase_start_trx_and_assign_read_view(
/*====================================*/
			/* out: 0 */
	THD*	thd)	/* in: MySQL thread handle of the user for whom
			the transaction should be committed */
{
	trx_t*	trx;

  	DBUG_ENTER("innobase_start_trx_and_assign_read_view");

	/* Create a new trx struct for thd, if it does not yet have one */

	trx = check_trx_exists(thd);

	/* This is just to play safe: release a possible FIFO ticket and
	search latch. Since we will reserve the kernel mutex, we have to
	release the search system latch first to obey the latching order. */

	innobase_release_stat_resources(trx);

	/* If the transaction is not started yet, start it */

	trx_start_if_not_started_noninline(trx);

	/* Assign a read view if the transaction does not have it yet */

	trx_assign_read_view(trx);

	/* Set the MySQL flag to mark that there is an active transaction */

	current_thd->transaction.all.innodb_active_trans = 1;

	DBUG_RETURN(0);
}

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/*********************************************************************
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Commits a transaction in an InnoDB database or marks an SQL statement
ended. */
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int
innobase_commit(
/*============*/
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			/* out: 0 */
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	THD*	thd,	/* in: MySQL thread handle of the user for whom
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			the transaction should be committed */
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	void*	trx_handle)/* in: InnoDB trx handle or
			&innodb_dummy_stmt_trx_handle: the latter means
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			that the current SQL statement ended */
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{
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	trx_t*		trx;
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  	DBUG_ENTER("innobase_commit");
  	DBUG_PRINT("trans", ("ending transaction"));

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	trx = check_trx_exists(thd);
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	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */
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	innobase_release_stat_resources(trx);
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	/* The flag thd->transaction.all.innodb_active_trans is set to 1 in
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	1. ::external_lock(),
	2. ::start_stmt(),
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	3. innobase_query_caching_of_table_permitted(),
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	4. innobase_savepoint(),
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	5. ::init_table_handle_for_HANDLER(),
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	6. innobase_start_trx_and_assign_read_view(),
	7. ::transactional_table_lock()
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	and it is only set to 0 in a commit or a rollback. If it is 0 we know
	there cannot be resources to be freed and we could return immediately.
	For the time being, we play safe and do the cleanup though there should
	be nothing to clean up. */
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	if (thd->transaction.all.innodb_active_trans == 0
	    && trx->conc_state != TRX_NOT_STARTED) {
	    
	        fprintf(stderr,
"InnoDB: Error: thd->transaction.all.innodb_active_trans == 0\n"
"InnoDB: but trx->conc_state != TRX_NOT_STARTED\n");
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	}
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	if (trx_handle != (void*)&innodb_dummy_stmt_trx_handle
	    || (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))) {
	        
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 		/* We were instructed to commit the whole transaction, or
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		this is an SQL statement end and autocommit is on */

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		innobase_commit_low(trx);
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		thd->transaction.all.innodb_active_trans = 0;
	} else {
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	        /* We just mark the SQL statement ended and do not do a
		transaction commit */

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		if (trx->auto_inc_lock) {
			/* If we had reserved the auto-inc lock for some
			table in this SQL statement we release it now */
		  	
			row_unlock_table_autoinc_for_mysql(trx);
		}
		/* Store the current undo_no of the transaction so that we
		know where to roll back if we have to roll back the next
		SQL statement */

		trx_mark_sql_stat_end(trx);
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	}
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	/* Tell the InnoDB server that there might be work for utility
	threads: */
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	srv_active_wake_master_thread();

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	DBUG_RETURN(0);
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}

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/*********************************************************************
This is called when MySQL writes the binlog entry for the current
transaction. Writes to the InnoDB tablespace info which tells where the
MySQL binlog entry for the current transaction ended. Also commits the
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transaction inside InnoDB but does NOT flush InnoDB log files to disk.
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To flush you have to call innobase_commit_complete(). We have separated
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flushing to eliminate the bottleneck of LOCK_log in log.cc which disabled
InnoDB's group commit capability. */
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int
innobase_report_binlog_offset_and_commit(
/*=====================================*/
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                                /* out: 0 */
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        THD*    thd,            /* in: user thread */
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        void*   trx_handle,     /* in: InnoDB trx handle */
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        char*   log_file_name,  /* in: latest binlog file name */
        my_off_t end_offset)    /* in: the offset in the binlog file
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                                   up to which we wrote */
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{
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	trx_t*	trx;

	trx = (trx_t*)trx_handle;
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	ut_a(trx != NULL);

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	trx->mysql_log_file_name = log_file_name;  	
	trx->mysql_log_offset = (ib_longlong)end_offset;
	
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	trx->flush_log_later = TRUE;

  	innobase_commit(thd, trx_handle);

	trx->flush_log_later = FALSE;

	return(0);
}

/*********************************************************************
This is called after MySQL has written the binlog entry for the current
transaction. Flushes the InnoDB log files to disk if required. */

int
innobase_commit_complete(
/*=====================*/
                                /* out: 0 */
        void*   trx_handle)     /* in: InnoDB trx handle */
{
	trx_t*	trx;

	if (srv_flush_log_at_trx_commit == 0) {

	        return(0);
	}

	trx = (trx_t*)trx_handle;

	ut_a(trx != NULL);

  	trx_commit_complete_for_mysql(trx);

	return(0);
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}

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/*********************************************************************
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Rolls back a transaction or the latest SQL statement. */
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int
innobase_rollback(
/*==============*/
			/* out: 0 or error number */
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	THD*	thd,	/* in: handle to the MySQL thread of the user
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			whose transaction should be rolled back */
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	void*	trx_handle)/* in: InnoDB trx handle or a dummy stmt handle;
			the latter means we roll back the latest SQL
			statement */
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{
	int	error = 0;
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	trx_t*	trx;
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	DBUG_ENTER("innobase_rollback");
	DBUG_PRINT("trans", ("aborting transaction"));

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	trx = check_trx_exists(thd);
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	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */

	innobase_release_stat_resources(trx);

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        if (trx->auto_inc_lock) {
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		/* If we had reserved the auto-inc lock for some table (if
		we come here to roll back the latest SQL statement) we
		release it now before a possibly lengthy rollback */
		
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		row_unlock_table_autoinc_for_mysql(trx);
	}

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	if (trx_handle != (void*)&innodb_dummy_stmt_trx_handle
	    || (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))) {
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		error = trx_rollback_for_mysql(trx);
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		thd->transaction.all.innodb_active_trans = 0;
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	} else {
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		error = trx_rollback_last_sql_stat_for_mysql(trx);
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	}
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	DBUG_RETURN(convert_error_code_to_mysql(error, NULL));
}

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/*********************************************************************
Rolls back a transaction */

int
innobase_rollback_trx(
/*==================*/
			/* out: 0 or error number */
	trx_t*	trx)	/*  in: transaction */
{
	int	error = 0;

	DBUG_ENTER("innobase_rollback_trx");
	DBUG_PRINT("trans", ("aborting transaction"));

	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */

	innobase_release_stat_resources(trx);

        if (trx->auto_inc_lock) {
		/* If we had reserved the auto-inc lock for some table (if
		we come here to roll back the latest SQL statement) we
		release it now before a possibly lengthy rollback */
		
		row_unlock_table_autoinc_for_mysql(trx);
	}

	error = trx_rollback_for_mysql(trx);

	DBUG_RETURN(convert_error_code_to_mysql(error, NULL));
}

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/*********************************************************************
Rolls back a transaction to a savepoint. */

int
innobase_rollback_to_savepoint(
/*===========================*/
				/* out: 0 if success, HA_ERR_NO_SAVEPOINT if
				no savepoint with the given name */
	THD*	thd,		/* in: handle to the MySQL thread of the user
				whose transaction should be rolled back */
	char*	savepoint_name,	/* in: savepoint name */
	my_off_t* binlog_cache_pos)/* out: position which corresponds to the
				savepoint in the binlog cache of this
				transaction, not defined if error */
{
	ib_longlong mysql_binlog_cache_pos;
	int	    error = 0;
	trx_t*	    trx;

	DBUG_ENTER("innobase_rollback_to_savepoint");

	trx = check_trx_exists(thd);

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	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */
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	innobase_release_stat_resources(trx);
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	error = trx_rollback_to_savepoint_for_mysql(trx, savepoint_name,
						&mysql_binlog_cache_pos);
	*binlog_cache_pos = (my_off_t)mysql_binlog_cache_pos;
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	DBUG_RETURN(convert_error_code_to_mysql(error, NULL));
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}

/*********************************************************************
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Sets a transaction savepoint. */

int
innobase_savepoint(
/*===============*/
				/* out: always 0, that is, always succeeds */
	THD*	thd,		/* in: handle to the MySQL thread */
	char*	savepoint_name,	/* in: savepoint name */
	my_off_t binlog_cache_pos)/* in: offset up to which the current
				transaction has cached log entries to its
				binlog cache, not defined if no transaction
				active, or we are in the autocommit state, or
				binlogging is not switched on */
{
	int	error = 0;
	trx_t*	trx;

	DBUG_ENTER("innobase_savepoint");

	if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {
		/* In the autocommit state there is no sense to set a
		savepoint: we return immediate success */
	        DBUG_RETURN(0);
	}

	trx = check_trx_exists(thd);

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	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */

	innobase_release_stat_resources(trx);

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	/* Setting a savepoint starts a transaction inside InnoDB since
	it allocates resources for it (memory to store the savepoint name,
	for example) */

	thd->transaction.all.innodb_active_trans = 1;

	error = trx_savepoint_for_mysql(trx, savepoint_name,
					     (ib_longlong)binlog_cache_pos);

	DBUG_RETURN(convert_error_code_to_mysql(error, NULL));
}

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/*********************************************************************
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Frees a possible InnoDB trx object associated with the current THD. */
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int
innobase_close_connection(
/*======================*/
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			/* out: 0 or error number */
	THD*	thd)	/* in: handle to the MySQL thread of the user
			whose transaction should be rolled back */
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{
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	trx_t*	trx;
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	trx = (trx_t*)thd->transaction.all.innobase_tid;
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	if (NULL != trx) {
	        innobase_rollback(thd, (void*)trx);
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		trx_free_for_mysql(trx);
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		thd->transaction.all.innobase_tid = NULL;
	}
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	return(0);
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}
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/*****************************************************************************
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** InnoDB database tables
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*****************************************************************************/

/********************************************************************
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Gives the file extension of an InnoDB single-table tablespace. */
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const char**
ha_innobase::bas_ext() const
/*========================*/
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				/* out: file extension string */
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{
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	static const char* ext[] = {".ibd", NullS};
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	return(ext);
}

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/*********************************************************************
Normalizes a table name string. A normalized name consists of the
database name catenated to '/' and table name. An example:
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test/mytable. On Windows normalization puts both the database name and the
table name always to lower case. */
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static
void
normalize_table_name(
/*=================*/
	char*		norm_name,	/* out: normalized name as a
					null-terminated string */
	const char*	name)		/* in: table name string */
{
	char*	name_ptr;
	char*	db_ptr;
	char*	ptr;

	/* Scan name from the end */

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	ptr = strend(name)-1;
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	while (ptr >= name && *ptr != '\\' && *ptr != '/') {
		ptr--;
	}

	name_ptr = ptr + 1;

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	DBUG_ASSERT(ptr > name);
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	ptr--;
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	while (ptr >= name && *ptr != '\\' && *ptr != '/') {
		ptr--;
	}

	db_ptr = ptr + 1;

	memcpy(norm_name, db_ptr, strlen(name) + 1 - (db_ptr - name));

	norm_name[name_ptr - db_ptr - 1] = '/';
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#ifdef __WIN__
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	innobase_casedn_str(norm_name);
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#endif
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}
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/*********************************************************************
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Creates and opens a handle to a table which already exists in an InnoDB
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database. */

int
ha_innobase::open(
/*==============*/
					/* out: 1 if error, 0 if success */
	const char*	name,		/* in: table name */
	int 		mode,		/* in: not used */
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	uint 		test_if_locked)	/* in: not used */
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{
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	dict_table_t*	ib_table;
  	char		norm_name[1000];
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	THD*		thd;
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	DBUG_ENTER("ha_innobase::open");

	UT_NOT_USED(mode);
	UT_NOT_USED(test_if_locked);

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	thd = current_thd;
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	normalize_table_name(norm_name, name);

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	user_thd = NULL;

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	last_query_id = (ulong)-1;

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	if (!(share=get_share(name))) {

		DBUG_RETURN(1);
	}
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	/* Create buffers for packing the fields of a record. Why
	table->reclength did not work here? Obviously, because char
	fields when packed actually became 1 byte longer, when we also
	stored the string length as the first byte. */
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	upd_and_key_val_buff_len = table->s->reclength + table->s->max_key_length
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							+ MAX_REF_PARTS * 3;
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	if (!(mysql_byte*) my_multi_malloc(MYF(MY_WME),
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				     &upd_buff, upd_and_key_val_buff_len,
				     &key_val_buff, upd_and_key_val_buff_len,
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				     NullS)) {
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	  	free_share(share);
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	  	DBUG_RETURN(1);
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  	}

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	/* Get pointer to a table object in InnoDB dictionary cache */
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	ib_table = dict_table_get_and_increment_handle_count(
				      		     norm_name, NULL);
 	if (NULL == ib_table) {
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	        ut_print_timestamp(stderr);
	        fprintf(stderr, "  InnoDB error:\n"
"Cannot find table %s from the internal data dictionary\n"
"of InnoDB though the .frm file for the table exists. Maybe you\n"
"have deleted and recreated InnoDB data files but have forgotten\n"
"to delete the corresponding .frm files of InnoDB tables, or you\n"
"have moved .frm files to another database?\n"
"Look from section 15.1 of http://www.innodb.com/ibman.html\n"
"how you can resolve the problem.\n",
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			  norm_name);
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	        free_share(share);
    		my_free((char*) upd_buff, MYF(0));
    		my_errno = ENOENT;
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    		DBUG_RETURN(1);
  	}

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 	if (ib_table->ibd_file_missing && !thd->tablespace_op) {
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	        ut_print_timestamp(stderr);
	        fprintf(stderr, "  InnoDB error:\n"
"MySQL is trying to open a table handle but the .ibd file for\n"
"table %s does not exist.\n"
"Have you deleted the .ibd file from the database directory under\n"
"the MySQL datadir, or have you used DISCARD TABLESPACE?\n"
"Look from section 15.1 of http://www.innodb.com/ibman.html\n"
"how you can resolve the problem.\n",
			  norm_name);
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	        free_share(share);
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    		my_free((char*) upd_buff, MYF(0));
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    		my_errno = ENOENT;
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    		DBUG_RETURN(1);
  	}

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	innobase_prebuilt = row_create_prebuilt(ib_table);
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	((row_prebuilt_t*)innobase_prebuilt)->mysql_row_len = table->s->reclength;
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	/* Looks like MySQL-3.23 sometimes has primary key number != 0 */

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 	primary_key = table->s->primary_key;
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	key_used_on_scan = primary_key;
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	/* Allocate a buffer for a 'row reference'. A row reference is
	a string of bytes of length ref_length which uniquely specifies
        a row in our table. Note that MySQL may also compare two row
        references for equality by doing a simple memcmp on the strings
        of length ref_length! */
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  	if (!row_table_got_default_clust_index(ib_table)) {
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	        if (primary_key >= MAX_KEY) {
	                fprintf(stderr,
		    "InnoDB: Error: table %s has a primary key in InnoDB\n"
		    "InnoDB: data dictionary, but not in MySQL!\n", name);
		}
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		((row_prebuilt_t*)innobase_prebuilt)
				->clust_index_was_generated = FALSE;
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 		/*
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		  MySQL allocates the buffer for ref. key_info->key_length
		  includes space for all key columns + one byte for each column
		  that may be NULL. ref_length must be as exact as possible to
		  save space, because all row reference buffers are allocated
		  based on ref_length.
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		*/
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  		ref_length = table->key_info[primary_key].key_length;
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	} else {
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	        if (primary_key != MAX_KEY) {
	                fprintf(stderr,
		    "InnoDB: Error: table %s has no primary key in InnoDB\n"
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		    "InnoDB: data dictionary, but has one in MySQL!\n"
		    "InnoDB: If you created the table with a MySQL\n"
                    "InnoDB: version < 3.23.54 and did not define a primary\n"
                    "InnoDB: key, but defined a unique key with all non-NULL\n"
                    "InnoDB: columns, then MySQL internally treats that key\n"
                    "InnoDB: as the primary key. You can fix this error by\n"
		    "InnoDB: dump + DROP + CREATE + reimport of the table.\n",
				name);
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		}

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		((row_prebuilt_t*)innobase_prebuilt)
				->clust_index_was_generated = TRUE;

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  		ref_length = DATA_ROW_ID_LEN;
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		/*
		  If we automatically created the clustered index, then
		  MySQL does not know about it, and MySQL must NOT be aware
		  of the index used on scan, to make it avoid checking if we
		  update the column of the index. That is why we assert below
		  that key_used_on_scan is the undefined value MAX_KEY.
		  The column is the row id in the automatical generation case,
		  and it will never be updated anyway.
		*/
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		if (key_used_on_scan != MAX_KEY) {
	                fprintf(stderr,
"InnoDB: Warning: table %s key_used_on_scan is %lu even though there is no\n"
"InnoDB: primary key inside InnoDB.\n",
1886
				name, (ulong)key_used_on_scan);
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1887
		}
1888
	}
1889

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1890 1891 1892
	block_size = 16 * 1024;	/* Index block size in InnoDB: used by MySQL
				in query optimization */

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1893
	/* Init table lock structure */
1894
	thr_lock_data_init(&share->lock,&lock,(void*) 0);
1895 1896

  	info(HA_STATUS_NO_LOCK | HA_STATUS_VARIABLE | HA_STATUS_CONST);
1897

1898 1899 1900 1901
  	DBUG_RETURN(0);
}

/**********************************************************************
1902
Closes a handle to an InnoDB table. */
1903 1904 1905 1906 1907 1908 1909 1910 1911 1912

int
ha_innobase::close(void)
/*====================*/
				/* out: error number */
{
  	DBUG_ENTER("ha_innobase::close");

	row_prebuilt_free((row_prebuilt_t*) innobase_prebuilt);

1913
    	my_free((char*) upd_buff, MYF(0));
1914 1915
        free_share(share);

1916
	/* Tell InnoDB server that there might be work for
1917 1918 1919 1920 1921 1922 1923
	utility threads: */

	srv_active_wake_master_thread();

  	DBUG_RETURN(0);
}

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1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996
/* The following accessor functions should really be inside MySQL code! */

/******************************************************************
Gets field offset for a field in a table. */
inline
uint
get_field_offset(
/*=============*/
			/* out: offset */
	TABLE*	table,	/* in: MySQL table object */
	Field*	field)	/* in: MySQL field object */
{
	return((uint) (field->ptr - (char*) table->record[0]));
}

/******************************************************************
Checks if a field in a record is SQL NULL. Uses the record format
information in table to track the null bit in record. */
inline
uint
field_in_record_is_null(
/*====================*/
			/* out: 1 if NULL, 0 otherwise */
	TABLE*	table,	/* in: MySQL table object */
	Field*	field,	/* in: MySQL field object */
	char*	record)	/* in: a row in MySQL format */
{
	int	null_offset;

	if (!field->null_ptr) {

		return(0);
	}

	null_offset = (uint) ((char*) field->null_ptr
					- (char*) table->record[0]);

	if (record[null_offset] & field->null_bit) {

		return(1);
	}

	return(0);
}

/******************************************************************
Sets a field in a record to SQL NULL. Uses the record format
information in table to track the null bit in record. */
inline
void
set_field_in_record_to_null(
/*========================*/
	TABLE*	table,	/* in: MySQL table object */
	Field*	field,	/* in: MySQL field object */
	char*	record)	/* in: a row in MySQL format */
{
	int	null_offset;

	null_offset = (uint) ((char*) field->null_ptr
					- (char*) table->record[0]);

	record[null_offset] = record[null_offset] | field->null_bit;
}

/******************************************************************
Resets SQL NULL bits in a record to zero. */
inline
void
reset_null_bits(
/*============*/
	TABLE*	table,	/* in: MySQL table object */
	char*	record)	/* in: a row in MySQL format */
{
1997
	bzero(record, table->s->null_bytes);
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1998 1999
}

2000 2001
extern "C" {
/*****************************************************************
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2002 2003 2004 2005
InnoDB uses this function to compare two data fields for which the data type
is such that we must use MySQL code to compare them. NOTE that the prototype
of this function is in rem0cmp.c in InnoDB source code! If you change this
function, remember to update the prototype there! */
2006 2007 2008

int
innobase_mysql_cmp(
2009
/*===============*/
2010 2011
					/* out: 1, 0, -1, if a is greater,
					equal, less than b, respectively */
2012
	int		mysql_type,	/* in: MySQL type */
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2013
	uint		charset_number,	/* in: number of the charset */
2014 2015 2016 2017 2018 2019 2020
	unsigned char*	a,		/* in: data field */
	unsigned int	a_length,	/* in: data field length,
					not UNIV_SQL_NULL */
	unsigned char*	b,		/* in: data field */
	unsigned int	b_length)	/* in: data field length,
					not UNIV_SQL_NULL */
{
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	CHARSET_INFO*		charset;
2022
	enum_field_types	mysql_tp;
2023
	int                     ret;
2024

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2025 2026
	DBUG_ASSERT(a_length != UNIV_SQL_NULL);
	DBUG_ASSERT(b_length != UNIV_SQL_NULL);
2027 2028 2029 2030 2031

	mysql_tp = (enum_field_types) mysql_type;

	switch (mysql_tp) {

2032
	case MYSQL_TYPE_STRING:
2033
	case MYSQL_TYPE_VAR_STRING:
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	case FIELD_TYPE_TINY_BLOB:
	case FIELD_TYPE_MEDIUM_BLOB:
	case FIELD_TYPE_BLOB:
	case FIELD_TYPE_LONG_BLOB:
2038
        case MYSQL_TYPE_VARCHAR:
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		/* Use the charset number to pick the right charset struct for
		the comparison. Since the MySQL function get_charset may be
		slow before Bar removes the mutex operation there, we first
		look at 2 common charsets directly. */

		if (charset_number == default_charset_info->number) {
			charset = default_charset_info;
		} else if (charset_number == my_charset_latin1.number) {
			charset = &my_charset_latin1;
		} else {
			charset = get_charset(charset_number, MYF(MY_WME));

			if (charset == NULL) {
				fprintf(stderr,
"InnoDB: fatal error: InnoDB needs charset %lu for doing a comparison,\n"
"InnoDB: but MySQL cannot find that charset.\n", (ulong)charset_number);
				ut_a(0);
			}
		}

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                /* Starting from 4.1.3, we use strnncollsp() in comparisons of
                non-latin1_swedish_ci strings. NOTE that the collation order
                changes then: 'b\0\0...' is ordered BEFORE 'b  ...'. Users
                having indexes on such data need to rebuild their tables! */

                ret = charset->coll->strnncollsp(charset,
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2065
                                  a, a_length,
2066
                                                 b, b_length, 0);
2067
		if (ret < 0) {
2068
		        return(-1);
2069
		} else if (ret > 0) {
2070
		        return(1);
2071
		} else {
2072
		        return(0);
2073
	        }
2074 2075 2076 2077 2078 2079 2080 2081 2082
	default:
		assert(0);
	}

	return(0);
}
}

/******************************************************************
2083
Converts a MySQL type to an InnoDB type. */
2084 2085
inline
ulint
2086 2087 2088
get_innobase_type_from_mysql_type(
/*==============================*/
			/* out: DATA_BINARY, DATA_VARCHAR, ... */
2089 2090
	Field*	field)	/* in: MySQL field */
{
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2091 2092 2093
	/* The following asserts try to check that the MySQL type code fits in
	8 bits: this is used in ibuf and also when DATA_NOT_NULL is ORed to
	the type */
2094 2095

	switch (field->type()) {
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2096 2097
	        /* NOTE that we only allow string types in DATA_MYSQL
		and DATA_VARMYSQL */
2098 2099
                case MYSQL_TYPE_VAR_STRING:
                case MYSQL_TYPE_VARCHAR: if (field->binary()) {
2100 2101
						return(DATA_BINARY);
					} else if (strcmp(
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						  field->charset()->name,
						 "latin1_swedish_ci") == 0) {
2104
						return(DATA_VARCHAR);
2105 2106
					} else {
						return(DATA_VARMYSQL);
2107
					}
2108
		case MYSQL_TYPE_STRING: if (field->binary()) {
2109 2110 2111

						return(DATA_FIXBINARY);
					} else if (strcmp(
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						   field->charset()->name,
						   "latin1_swedish_ci") == 0) {
2114
						return(DATA_CHAR);
2115 2116
					} else {
						return(DATA_MYSQL);
2117
					}
2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128
		case FIELD_TYPE_LONG:
		case FIELD_TYPE_LONGLONG:
		case FIELD_TYPE_TINY:
		case FIELD_TYPE_SHORT:
		case FIELD_TYPE_INT24:
		case FIELD_TYPE_DATE:
		case FIELD_TYPE_DATETIME:
		case FIELD_TYPE_YEAR:
		case FIELD_TYPE_NEWDATE:
		case FIELD_TYPE_ENUM:
		case FIELD_TYPE_SET:
2129 2130 2131
		case FIELD_TYPE_TIME:
		case FIELD_TYPE_TIMESTAMP:
					return(DATA_INT);
2132
		case FIELD_TYPE_FLOAT:
2133
					return(DATA_FLOAT);
2134
		case FIELD_TYPE_DOUBLE:
2135
					return(DATA_DOUBLE);
2136
		case FIELD_TYPE_DECIMAL:
2137 2138 2139 2140 2141 2142
					return(DATA_DECIMAL);
		case FIELD_TYPE_TINY_BLOB:
		case FIELD_TYPE_MEDIUM_BLOB:
		case FIELD_TYPE_BLOB:
		case FIELD_TYPE_LONG_BLOB:
					return(DATA_BLOB);
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		default:
					assert(0);
	}

	return(0);
}
2149

2150
/***********************************************************************
2151
Stores a key value for a row to a buffer. */
2152 2153 2154 2155 2156 2157 2158

uint
ha_innobase::store_key_val_for_row(
/*===============================*/
				/* out: key value length as stored in buff */
	uint 		keynr,	/* in: key number */
	char*		buff,	/* in/out: buffer for the key value (in MySQL
2159 2160
				format) */
	uint		buff_len,/* in: buffer length */
2161
	const mysql_byte* record)/* in: row in MySQL format */
2162 2163 2164 2165 2166
{
	KEY*		key_info 	= table->key_info + keynr;
  	KEY_PART_INFO*	key_part	= key_info->key_part;
  	KEY_PART_INFO*	end		= key_part + key_info->key_parts;
	char*		buff_start	= buff;
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	enum_field_types mysql_type;
	Field*		field;
	ulint		blob_len;
	byte*		blob_data;
	ibool		is_null;
2172

2173 2174
  	DBUG_ENTER("store_key_val_for_row");

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	/* The format for storing a key field in MySQL is the following:

	1. If the column can be NULL, then in the first byte we put 1 if the
	field value is NULL, 0 otherwise.

	2. If the column is of a BLOB type (it must be a column prefix field
	in this case), then we put the length of the data in the field to the
	next 2 bytes, in the little-endian format. If the field is SQL NULL,
	then these 2 bytes are set to 0. Note that the length of data in the
	field is <= column prefix length.

	3. In a column prefix field, prefix_len next bytes are reserved for
	data. In a normal field the max field length next bytes are reserved
	for data. For a VARCHAR(n) the max field length is n. If the stored
	value is the SQL NULL then these data bytes are set to 0. */	

2191 2192 2193
	/* We have to zero-fill the buffer so that MySQL is able to use a
	simple memcmp to compare two key values to determine if they are
	equal. MySQL does this to compare contents of two 'ref' values. */
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2195
	bzero(buff, buff_len);
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2196

2197
  	for (; key_part != end; key_part++) {
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2198
	        is_null = FALSE;
2199 2200 2201 2202

    		if (key_part->null_bit) {
      			if (record[key_part->null_offset]
						& key_part->null_bit) {
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				*buff = 1;
				is_null = TRUE;
      			} else {
				*buff = 0;
			}
			buff++;
2209
    		}
2210

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		field = key_part->field;
		mysql_type = field->type();

		if (mysql_type == FIELD_TYPE_TINY_BLOB
		    || mysql_type == FIELD_TYPE_MEDIUM_BLOB
		    || mysql_type == FIELD_TYPE_BLOB
		    || mysql_type == FIELD_TYPE_LONG_BLOB) {
2218

2219
			ut_a(key_part->key_part_flag & HA_PART_KEY_SEG);
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		        if (is_null) {
				 buff += key_part->length + 2;
				 
				 continue;
			}
		    
		        blob_data = row_mysql_read_blob_ref(&blob_len,
				(byte*) (record
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				+ (ulint)get_field_offset(table, field)),
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					(ulint) field->pack_length());

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			ut_a(get_field_offset(table, field)
						     == key_part->offset);
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			if (blob_len > key_part->length) {
			        blob_len = key_part->length;
			}

			/* MySQL reserves 2 bytes for the length and the
			storage of the number is little-endian */

			ut_a(blob_len < 256);
2242
			*((byte*)buff) = (byte)blob_len;
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			buff += 2;

			memcpy(buff, blob_data, blob_len);

			buff += key_part->length;
		} else {
		        if (is_null) {
				 buff += key_part->length;
				 
				 continue;
			}
			memcpy(buff, record + key_part->offset,
							key_part->length);
			buff += key_part->length;
		}
2258 2259
  	}

2260
	ut_a(buff <= buff_start + buff_len);
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	DBUG_RETURN((uint)(buff - buff_start));
2263 2264 2265
}

/******************************************************************
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2266 2267
Builds a 'template' to the prebuilt struct. The template is used in fast
retrieval of just those column values MySQL needs in its processing. */
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2268
static
2269
void
2270 2271 2272 2273 2274 2275 2276 2277 2278
build_template(
/*===========*/
	row_prebuilt_t*	prebuilt,	/* in: prebuilt struct */
	THD*		thd,		/* in: current user thread, used
					only if templ_type is
					ROW_MYSQL_REC_FIELDS */
	TABLE*		table,		/* in: MySQL table */
	ulint		templ_type)	/* in: ROW_MYSQL_WHOLE_ROW or
					ROW_MYSQL_REC_FIELDS */
2279
{
2280 2281
	dict_index_t*	index;
	dict_index_t*	clust_index;
2282
	mysql_row_templ_t* templ;
2283
	Field*		field;
2284 2285
	ulint		n_fields;
	ulint		n_requested_fields	= 0;
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2286
	ibool		fetch_all_in_key	= FALSE;
2287 2288 2289 2290 2291 2292 2293
	ibool		fetch_primary_key_cols	= TRUE; /* The ROR code in
						opt_range.cc assumes that the
						primary key cols are always
						retrieved. Starting from
						MySQL-5.0.2, let us always
						fetch them, even though it
						wastes some CPU. */ 
2294
	ulint		i;
2295

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2296 2297 2298 2299
	if (prebuilt->select_lock_type == LOCK_X) {
		/* We always retrieve the whole clustered index record if we
		use exclusive row level locks, for example, if the read is
		done in an UPDATE statement. */
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	        templ_type = ROW_MYSQL_WHOLE_ROW;
	}

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	if (templ_type == ROW_MYSQL_REC_FIELDS) {
	     if (prebuilt->hint_need_to_fetch_extra_cols
						== ROW_RETRIEVE_ALL_COLS) {
2307

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2308 2309
		/* We know we must at least fetch all columns in the key, or
		all columns in the table */
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2311
		if (prebuilt->read_just_key) {
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2312
			/* MySQL has instructed us that it is enough to
2313 2314 2315 2316 2317
			fetch the columns in the key; looks like MySQL
			can set this flag also when there is only a
			prefix of the column in the key: in that case we
			retrieve the whole column from the clustered
			index */
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2319 2320 2321 2322
			fetch_all_in_key = TRUE;
		} else {
			templ_type = ROW_MYSQL_WHOLE_ROW;
		}
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	    } else if (prebuilt->hint_need_to_fetch_extra_cols
						== ROW_RETRIEVE_PRIMARY_KEY) {
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		/* We must at least fetch all primary key cols. Note that if
		the clustered index was internally generated by InnoDB on the
		row id (no primary key was defined), then
		row_search_for_mysql() will always retrieve the row id to a
		special buffer in the prebuilt struct. */
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		fetch_primary_key_cols = TRUE;
	    }
2333 2334
	}

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	clust_index = dict_table_get_first_index_noninline(prebuilt->table);
2336

2337
	if (templ_type == ROW_MYSQL_REC_FIELDS) {
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2338
		index = prebuilt->index;
2339 2340
	} else {
		index = clust_index;
2341
	}
2342

2343 2344 2345 2346 2347 2348 2349
	if (index == clust_index) {
		prebuilt->need_to_access_clustered = TRUE;
	} else {
		prebuilt->need_to_access_clustered = FALSE;
		/* Below we check column by column if we need to access
		the clustered index */
	}
2350

2351
	n_fields = (ulint)table->s->fields; /* number of columns */
2352 2353 2354 2355 2356 2357

	if (!prebuilt->mysql_template) {
		prebuilt->mysql_template = (mysql_row_templ_t*)
						mem_alloc_noninline(
					n_fields * sizeof(mysql_row_templ_t));
	}
2358

2359
	prebuilt->template_type = templ_type;
2360
	prebuilt->null_bitmap_len = table->s->null_bytes;
2361

2362 2363
	prebuilt->templ_contains_blob = FALSE;

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	/* Note that in InnoDB, i is the column number. MySQL calls columns
	'fields'. */
2366
	for (i = 0; i < n_fields; i++) {
2367
		templ = prebuilt->mysql_template + n_requested_fields;
2368 2369
		field = table->field[i];

2370 2371
                ibool index_contains_field=
                  dict_index_contains_col_or_prefix(index, i);
2372 2373 2374

		if (templ_type == ROW_MYSQL_REC_FIELDS && 
                    ((prebuilt->read_just_key && !index_contains_field) ||
2375 2376 2377 2378
		     (!(fetch_all_in_key && index_contains_field) &&
		      !(fetch_primary_key_cols &&
			dict_table_col_in_clustered_key(index->table, i)) &&
		      thd->query_id != field->query_id))) {
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2379 2380

			/* This field is not needed in the query, skip it */
2381 2382 2383 2384 2385

			goto skip_field;
		}

		n_requested_fields++;
2386

2387
		templ->col_no = i;
2388

2389 2390 2391
		if (index == clust_index) {
			templ->rec_field_no = (index->table->cols + i)
								->clust_pos;
2392
		} else {
2393 2394
			templ->rec_field_no = dict_index_get_nth_col_pos(
								index, i);
2395 2396
		}

2397 2398 2399 2400 2401 2402 2403 2404
		if (templ->rec_field_no == ULINT_UNDEFINED) {
			prebuilt->need_to_access_clustered = TRUE;
		}

		if (field->null_ptr) {
			templ->mysql_null_byte_offset =
				(ulint) ((char*) field->null_ptr
					- (char*) table->record[0]);
2405

2406 2407 2408 2409
			templ->mysql_null_bit_mask = (ulint) field->null_bit;
		} else {
			templ->mysql_null_bit_mask = 0;
		}
2410

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2411 2412 2413
		templ->mysql_col_offset = (ulint)
					get_field_offset(table, field);

2414 2415 2416
		templ->mysql_col_len = (ulint) field->pack_length();
		templ->type = get_innobase_type_from_mysql_type(field);
		templ->is_unsigned = (ulint) (field->flags & UNSIGNED_FLAG);
2417

2418 2419
		if (templ->type == DATA_BLOB) {
			prebuilt->templ_contains_blob = TRUE;
2420
		}
2421 2422 2423
skip_field:
		;
	}
2424

2425
	prebuilt->n_template = n_requested_fields;
2426

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2427
	if (index != clust_index && prebuilt->need_to_access_clustered) {
2428 2429 2430 2431
		/* Change rec_field_no's to correspond to the clustered index
		record */
		for (i = 0; i < n_requested_fields; i++) {
			templ = prebuilt->mysql_template + i;
2432

2433 2434 2435
			templ->rec_field_no =
			    (index->table->cols + templ->col_no)->clust_pos;
		}
2436
	}
2437 2438 2439
}

/************************************************************************
2440
Stores a row in an InnoDB database, to the table specified in this
2441 2442 2443 2444 2445
handle. */

int
ha_innobase::write_row(
/*===================*/
2446 2447
				/* out: error code */
	mysql_byte* 	record)	/* in: a row in MySQL format */
2448
{
2449
	row_prebuilt_t* prebuilt = (row_prebuilt_t*)innobase_prebuilt;
2450
  	int 		error;
2451
	longlong	auto_inc;
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2452
	longlong	dummy;
2453 2454
	ibool           incremented_auto_inc_for_stat = FALSE;
	ibool           incremented_auto_inc_counter = FALSE;
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2455
	ibool           auto_inc_used= FALSE;
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2456

2457
  	DBUG_ENTER("ha_innobase::write_row");
2458

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2459 2460 2461 2462
	if (prebuilt->trx !=
			(trx_t*) current_thd->transaction.all.innobase_tid) {
		fprintf(stderr,
"InnoDB: Error: the transaction object for the table handle is at\n"
2463 2464 2465 2466 2467 2468 2469 2470 2471
"InnoDB: %p, but for the current thread it is at %p\n",
			prebuilt->trx,
			current_thd->transaction.all.innobase_tid);
		fputs("InnoDB: Dump of 200 bytes around prebuilt: ", stderr);
		ut_print_buf(stderr, ((const byte*)prebuilt) - 100, 200);
		fputs("\n"
			"InnoDB: Dump of 200 bytes around transaction.all: ",
			stderr);
		ut_print_buf(stderr,
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2472
			((byte*)(&(current_thd->transaction.all))) - 100, 200);
2473 2474
		putc('\n', stderr);
		ut_error;
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2475
	}
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2476

2477 2478
  	statistic_increment(current_thd->status_var.ha_write_count,
			    &LOCK_status);
2479

2480 2481
        if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_INSERT)
                table->timestamp_field->set_time();
2482

2483
	if (user_thd->lex->sql_command == SQLCOM_ALTER_TABLE
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2484
	    && num_write_row >= 10000) {
2485 2486 2487 2488 2489 2490 2491 2492
		/* ALTER TABLE is COMMITted at every 10000 copied rows.
		The IX table lock for the original table has to be re-issued.
		As this method will be called on a temporary table where the
		contents of the original table is being copied to, it is
		a bit tricky to determine the source table.  The cursor
		position in the source table need not be adjusted after the
		intermediate COMMIT, since writes by other transactions are
		being blocked by a MySQL table lock TL_WRITE_ALLOW_READ. */
2493

2494
		dict_table_t*	src_table;
2495 2496
		ibool		mode;

2497
		num_write_row = 0;
2498

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2499 2500
		/* Commit the transaction.  This will release the table
		locks, so they have to be acquired again. */
2501 2502 2503 2504 2505 2506 2507 2508 2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520

		/* Altering an InnoDB table */
		/* Get the source table. */
		src_table = lock_get_src_table(
				prebuilt->trx, prebuilt->table, &mode);
		if (!src_table) {
		no_commit:
			/* Unknown situation: do not commit */
			/*
			ut_print_timestamp(stderr);
			fprintf(stderr,
				"  InnoDB error: ALTER TABLE is holding lock"
				" on %lu tables!\n",
				prebuilt->trx->mysql_n_tables_locked);
			*/
			;
		} else if (src_table == prebuilt->table) {
			/* Source table is not in InnoDB format:
			no need to re-acquire locks on it. */

2521 2522 2523 2524 2525 2526
			/* Altering to InnoDB format */
			innobase_commit(user_thd, prebuilt->trx);
			/* Note that this transaction is still active. */
			user_thd->transaction.all.innodb_active_trans = 1;
			/* We will need an IX lock on the destination table. */
		        prebuilt->sql_stat_start = TRUE;
2527 2528 2529 2530 2531
		} else {
			/* Ensure that there are no other table locks than
			LOCK_IX and LOCK_AUTO_INC on the destination table. */
			if (!lock_is_table_exclusive(prebuilt->table,
							prebuilt->trx)) {
2532 2533 2534 2535 2536 2537 2538 2539 2540
				goto no_commit;
			}

			/* Commit the transaction.  This will release the table
			locks, so they have to be acquired again. */
			innobase_commit(user_thd, prebuilt->trx);
			/* Note that this transaction is still active. */
			user_thd->transaction.all.innodb_active_trans = 1;
			/* Re-acquire the table lock on the source table. */
2541
			row_lock_table_for_mysql(prebuilt, src_table, mode);
2542 2543 2544
			/* We will need an IX lock on the destination table. */
		        prebuilt->sql_stat_start = TRUE;
		}
2545 2546
	}

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2547 2548
	num_write_row++;

2549 2550 2551
	if (last_query_id != user_thd->query_id) {
	        prebuilt->sql_stat_start = TRUE;
                last_query_id = user_thd->query_id;
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2552 2553

		innobase_release_stat_resources(prebuilt->trx);
2554 2555
	}

2556
  	if (table->next_number_field && record == table->record[0]) {
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2557 2558
		/* This is the case where the table has an
		auto-increment column */
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2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583

		/* Initialize the auto-inc counter if it has not been
		initialized yet */

		if (0 == dict_table_autoinc_peek(prebuilt->table)) {

			/* This call initializes the counter */
		        error = innobase_read_and_init_auto_inc(&dummy);

			if (error) {
				/* Deadlock or lock wait timeout */

				goto func_exit;
			}

			/* We have to set sql_stat_start to TRUE because
			the above call probably has called a select, and
			has reset that flag; row_insert_for_mysql has to
			know to set the IX intention lock on the table,
			something it only does at the start of each
			statement */

			prebuilt->sql_stat_start = TRUE;
		}

2584 2585 2586 2587 2588 2589
		/*
                  We must use the handler code to update the auto-increment
                  value to be sure that increment it correctly.
                */
    		update_auto_increment();
                auto_inc_used= 1;
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2590

2591
	}
2592

2593 2594 2595 2596
	if (prebuilt->mysql_template == NULL
			|| prebuilt->template_type != ROW_MYSQL_WHOLE_ROW) {
		/* Build the template used in converting quickly between
		the two database formats */
2597

2598 2599
		build_template(prebuilt, NULL, table, ROW_MYSQL_WHOLE_ROW);
	}
2600

2601
	innodb_srv_conc_enter_innodb(prebuilt->trx);
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Merge  
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2602

2603
	error = row_insert_for_mysql((byte*) record, prebuilt);
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Merge  
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2604

2605
	if (error == DB_SUCCESS && auto_inc_used) {
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Merge  
monty@donna.mysql.fi committed
2606

2607
        /* Fetch the value that was set in the autoincrement field */
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2608

2609 2610 2611
          auto_inc = table->next_number_field->val_int();

          if (auto_inc != 0) {
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2612 2613 2614
			/* This call will calculate the max of the current
			value and the value supplied by the user and
			update the counter accordingly */
2615 2616 2617 2618 2619 2620 2621 2622

			/* We have to use the transactional lock mechanism
			on the auto-inc counter of the table to ensure
			that replication and roll-forward of the binlog
			exactly imitates also the given auto-inc values.
			The lock is released at each SQL statement's
			end. */

2623
            error = row_lock_table_autoinc_for_mysql(prebuilt);
2624

2625
            if (error != DB_SUCCESS) {
2626

2627 2628 2629 2630 2631 2632
              error = convert_error_code_to_mysql(error, user_thd);
              goto func_exit;
            }
            dict_table_autoinc_update(prebuilt->table, auto_inc);
          }
        }
2633

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2634
	innodb_srv_conc_exit_innodb(prebuilt->trx);
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Merge  
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2635

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2636
	error = convert_error_code_to_mysql(error, user_thd);
2637

2638
	/* Tell InnoDB server that there might be work for
2639
	utility threads: */
2640
func_exit:
2641
	innobase_active_small();
2642 2643 2644 2645

  	DBUG_RETURN(error);
}

2646

2647
/******************************************************************
2648
Converts field data for storage in an InnoDB update vector. */
2649 2650 2651 2652 2653 2654 2655 2656 2657 2658
inline
mysql_byte*
innobase_convert_and_store_changed_col(
/*===================================*/
				/* out: pointer to the end of the converted
				data in the buffer */
	upd_field_t*	ufield,	/* in/out: field in the update vector */
	mysql_byte*	buf,	/* in: buffer we can use in conversion */
	mysql_byte*	data,	/* in: column data to store */
	ulint		len,	/* in: data len */
2659
	ulint		col_type,/* in: data type in InnoDB type numbers */
2660
	ulint		is_unsigned)/* in: != 0 if an unsigned integer type */
2661
{
2662 2663 2664 2665
	uint	i;

	if (len == UNIV_SQL_NULL) {
		data = NULL;
2666 2667 2668 2669 2670 2671
        } else if (col_type == DATA_VARCHAR || col_type == DATA_BINARY
                   || col_type == DATA_VARMYSQL) {
                /* Remove trailing spaces */
                while (len > 0 && data[len - 1] == ' ') {
                        len--;
                }
2672
	} else if (col_type == DATA_INT) {
2673
		/* Store integer data in InnoDB in a big-endian
2674
		format, sign bit negated, if signed */
2675

2676 2677 2678 2679 2680 2681 2682 2683 2684 2685 2686
		for (i = 0; i < len; i++) {
			buf[len - 1 - i] = data[i];
		}

		if (!is_unsigned) {
			buf[0] = buf[0] ^ 128;
		}

		data = buf;

		buf += len;
2687
	}
2688 2689 2690 2691 2692 2693 2694 2695 2696 2697 2698 2699 2700 2701 2702 2703 2704 2705

	ufield->new_val.data = data;
	ufield->new_val.len = len;

	return(buf);
}

/**************************************************************************
Checks which fields have changed in a row and stores information
of them to an update vector. */
static
int
calc_row_difference(
/*================*/
					/* out: error number or 0 */
	upd_t*		uvect,		/* in/out: update vector */
	mysql_byte* 	old_row,	/* in: old row in MySQL format */
	mysql_byte* 	new_row,	/* in: new row in MySQL format */
2706 2707
	struct st_table* table,		/* in: table in MySQL data
					dictionary */
2708
	mysql_byte*	upd_buff,	/* in: buffer to use */
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2709
	ulint		buff_len,	/* in: buffer length */
2710
	row_prebuilt_t*	prebuilt,	/* in: InnoDB prebuilt struct */
2711 2712
	THD*		thd)		/* in: user thread */
{
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2713
	mysql_byte*	original_upd_buff = upd_buff;
2714
	Field*		field;
2715 2716 2717
	uint		n_fields;
	ulint		o_len;
	ulint		n_len;
2718 2719 2720
	byte*	        o_ptr;
        byte*	        n_ptr;
        byte*	        buf;
2721
	upd_field_t*	ufield;
2722 2723
	ulint		col_type;
	ulint		is_unsigned;
2724
	ulint		n_changed = 0;
2725
	uint		i;
2726

2727
	n_fields = table->s->fields;
2728

2729
	/* We use upd_buff to convert changed fields */
2730
	buf = (byte*) upd_buff;
2731

2732 2733 2734
	for (i = 0; i < n_fields; i++) {
		field = table->field[i];

2735
		/* if (thd->query_id != field->query_id) { */
2736 2737
			/* TODO: check that these fields cannot have
			changed! */
2738

2739 2740
		/*	goto skip_field;
		}*/
2741

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2742 2743
		o_ptr = (byte*) old_row + get_field_offset(table, field);
		n_ptr = (byte*) new_row + get_field_offset(table, field);
2744 2745 2746
		o_len = field->pack_length();
		n_len = field->pack_length();

2747
		col_type = get_innobase_type_from_mysql_type(field);
2748
		is_unsigned = (ulint) (field->flags & UNSIGNED_FLAG);
2749 2750 2751 2752 2753 2754 2755 2756 2757 2758

		switch (col_type) {

		case DATA_BLOB:
			o_ptr = row_mysql_read_blob_ref(&o_len, o_ptr, o_len);
			n_ptr = row_mysql_read_blob_ref(&n_len, n_ptr, n_len);
			break;
		case DATA_VARCHAR:
		case DATA_BINARY:
		case DATA_VARMYSQL:
2759 2760 2761 2762
			o_ptr = row_mysql_read_var_ref_noninline(&o_len,
								o_ptr);
			n_ptr = row_mysql_read_var_ref_noninline(&n_len,
								n_ptr);
2763 2764 2765
		default:
			;
		}
2766

2767
		if (field->null_ptr) {
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2768 2769
			if (field_in_record_is_null(table, field,
							(char*) old_row)) {
2770 2771
				o_len = UNIV_SQL_NULL;
			}
2772

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2773 2774
			if (field_in_record_is_null(table, field,
							(char*) new_row)) {
2775 2776 2777 2778 2779 2780 2781 2782 2783 2784
				n_len = UNIV_SQL_NULL;
			}
		}

		if (o_len != n_len || (o_len != UNIV_SQL_NULL &&
					0 != memcmp(o_ptr, n_ptr, o_len))) {
			/* The field has changed */

			ufield = uvect->fields + n_changed;

2785 2786 2787 2788
			buf = (byte*)
                          innobase_convert_and_store_changed_col(ufield,
					  (mysql_byte*)buf,
					  (mysql_byte*)n_ptr, n_len, col_type,
2789
						is_unsigned);
2790
			ufield->exp = NULL;
2791 2792
			ufield->field_no =
					(prebuilt->table->cols + i)->clust_pos;
2793 2794 2795 2796 2797 2798 2799
			n_changed++;
		}
	}

	uvect->n_fields = n_changed;
	uvect->info_bits = 0;

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2800 2801
	ut_a(buf <= (byte*)original_upd_buff + buff_len);

2802 2803 2804 2805 2806 2807 2808
	return(0);
}

/**************************************************************************
Updates a row given as a parameter to a new value. Note that we are given
whole rows, not just the fields which are updated: this incurs some
overhead for CPU when we check which fields are actually updated.
2809
TODO: currently InnoDB does not prevent the 'Halloween problem':
2810 2811
in a searched update a single row can get updated several times
if its index columns are updated! */
2812

2813 2814 2815 2816
int
ha_innobase::update_row(
/*====================*/
					/* out: error number or 0 */
2817 2818
	const mysql_byte* 	old_row,/* in: old row in MySQL format */
	mysql_byte* 		new_row)/* in: new row in MySQL format */
2819 2820 2821 2822 2823
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	upd_t*		uvect;
	int		error = 0;

2824
	DBUG_ENTER("ha_innobase::update_row");
2825

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2826 2827
	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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2828

2829 2830
        if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_UPDATE)
                table->timestamp_field->set_time();
2831

2832 2833 2834
	if (last_query_id != user_thd->query_id) {
	        prebuilt->sql_stat_start = TRUE;
                last_query_id = user_thd->query_id;
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2835 2836

		innobase_release_stat_resources(prebuilt->trx);
2837 2838
	}

2839 2840 2841 2842 2843
	if (prebuilt->upd_node) {
		uvect = prebuilt->upd_node->update;
	} else {
		uvect = row_get_prebuilt_update_vector(prebuilt);
	}
2844 2845 2846 2847

	/* Build an update vector from the modified fields in the rows
	(uses upd_buff of the handle) */

2848
	calc_row_difference(uvect, (mysql_byte*) old_row, new_row, table,
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2849 2850 2851
			upd_buff, (ulint)upd_and_key_val_buff_len,
			prebuilt, user_thd);

2852 2853 2854
	/* This is not a delete */
	prebuilt->upd_node->is_delete = FALSE;

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2855
	assert(prebuilt->template_type == ROW_MYSQL_WHOLE_ROW);
2856

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2857
	innodb_srv_conc_enter_innodb(prebuilt->trx);
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Merge  
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2858

2859
	error = row_update_for_mysql((byte*) old_row, prebuilt);
2860

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2861
	innodb_srv_conc_exit_innodb(prebuilt->trx);
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Merge  
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2862

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2863
	error = convert_error_code_to_mysql(error, user_thd);
2864

2865
	/* Tell InnoDB server that there might be work for
2866 2867
	utility threads: */

2868
	innobase_active_small();
2869 2870 2871 2872 2873 2874 2875 2876 2877 2878

	DBUG_RETURN(error);
}

/**************************************************************************
Deletes a row given as the parameter. */

int
ha_innobase::delete_row(
/*====================*/
2879 2880
					/* out: error number or 0 */
	const mysql_byte* record)	/* in: a row in MySQL format */
2881 2882 2883 2884
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	int		error = 0;

2885
	DBUG_ENTER("ha_innobase::delete_row");
2886

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2887 2888
	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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2890 2891 2892
	if (last_query_id != user_thd->query_id) {
	        prebuilt->sql_stat_start = TRUE;
                last_query_id = user_thd->query_id;
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		innobase_release_stat_resources(prebuilt->trx);
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	}

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	if (!prebuilt->upd_node) {
		row_get_prebuilt_update_vector(prebuilt);
	}
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	/* This is a delete */
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	prebuilt->upd_node->is_delete = TRUE;
2904

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	innodb_srv_conc_enter_innodb(prebuilt->trx);
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	error = row_update_for_mysql((byte*) record, prebuilt);
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	innodb_srv_conc_exit_innodb(prebuilt->trx);
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	error = convert_error_code_to_mysql(error, user_thd);
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	/* Tell the InnoDB server that there might be work for
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	utility threads: */

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	innobase_active_small();
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	DBUG_RETURN(error);
}

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/**************************************************************************
Deletes a lock set to a row */

void
ha_innobase::unlock_row(void)
/*=========================*/
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;

	DBUG_ENTER("ha_innobase::unlock_row");

	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);

	if (last_query_id != user_thd->query_id) {
		ut_print_timestamp(stderr);
		fprintf(stderr,
"  InnoDB: Error: last_query_id is %lu != user_thd_query_id is %lu\n",
			(ulong)last_query_id, (ulong)user_thd->query_id);
		mem_analyze_corruption((byte *) prebuilt->trx);
		ut_error;
	}

	row_unlock_for_mysql(prebuilt);
}

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/**********************************************************************
Initializes a handle to use an index. */

int
ha_innobase::index_init(
/*====================*/
			/* out: 0 or error number */
	uint 	keynr)	/* in: key (index) number */
{
	int 	error	= 0;
  	DBUG_ENTER("index_init");

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	error = change_active_index(keynr);
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  	DBUG_RETURN(error);
}

/**********************************************************************
2965
Currently does nothing. */
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int
ha_innobase::index_end(void)
/*========================*/
{
	int 	error	= 0;
  	DBUG_ENTER("index_end");
2973
        active_index=MAX_KEY;
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  	DBUG_RETURN(error);
}

/*************************************************************************
Converts a search mode flag understood by MySQL to a flag understood
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by InnoDB. */
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inline
ulint
convert_search_mode_to_innobase(
/*============================*/
	enum ha_rkey_function	find_flag)
{
	switch (find_flag) {
  		case HA_READ_KEY_EXACT:		return(PAGE_CUR_GE);
  			/* the above does not require the index to be UNIQUE */
  		case HA_READ_KEY_OR_NEXT:	return(PAGE_CUR_GE);
		case HA_READ_KEY_OR_PREV:	return(PAGE_CUR_LE);
		case HA_READ_AFTER_KEY:		return(PAGE_CUR_G);
		case HA_READ_BEFORE_KEY:	return(PAGE_CUR_L);
		case HA_READ_PREFIX:		return(PAGE_CUR_GE);
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	        case HA_READ_PREFIX_LAST:       return(PAGE_CUR_LE);
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                case HA_READ_PREFIX_LAST_OR_PREV:return(PAGE_CUR_LE);
		  /* In MySQL-4.0 HA_READ_PREFIX and HA_READ_PREFIX_LAST always
		  pass a complete-field prefix of a key value as the search
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		  tuple. I.e., it is not allowed that the last field would
		  just contain n first bytes of the full field value.
		  MySQL uses a 'padding' trick to convert LIKE 'abc%'
		  type queries so that it can use as a search tuple
		  a complete-field-prefix of a key value. Thus, the InnoDB
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		  search mode PAGE_CUR_LE_OR_EXTENDS is never used.
		  TODO: when/if MySQL starts to use also partial-field
		  prefixes, we have to deal with stripping of spaces
		  and comparison of non-latin1 char type fields in
		  innobase_mysql_cmp() to get PAGE_CUR_LE_OR_EXTENDS to
		  work correctly. */

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		default:			assert(0);
	}

	return(0);
}
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/*
   BACKGROUND INFO: HOW A SELECT SQL QUERY IS EXECUTED
   ---------------------------------------------------
The following does not cover all the details, but explains how we determine
the start of a new SQL statement, and what is associated with it.

For each table in the database the MySQL interpreter may have several
table handle instances in use, also in a single SQL query. For each table
handle instance there is an InnoDB  'prebuilt' struct which contains most
of the InnoDB data associated with this table handle instance.

  A) if the user has not explicitly set any MySQL table level locks:

  1) MySQL calls ::external_lock to set an 'intention' table level lock on
the table of the handle instance. There we set
prebuilt->sql_stat_start = TRUE. The flag sql_stat_start should be set
true if we are taking this table handle instance to use in a new SQL
statement issued by the user. We also increment trx->n_mysql_tables_in_use.

  2) If prebuilt->sql_stat_start == TRUE we 'pre-compile' the MySQL search
instructions to prebuilt->template of the table handle instance in
::index_read. The template is used to save CPU time in large joins.

  3) In row_search_for_mysql, if prebuilt->sql_stat_start is true, we
allocate a new consistent read view for the trx if it does not yet have one,
or in the case of a locking read, set an InnoDB 'intention' table level
lock on the table.

  4) We do the SELECT. MySQL may repeatedly call ::index_read for the
same table handle instance, if it is a join.

  5) When the SELECT ends, MySQL removes its intention table level locks
in ::external_lock. When trx->n_mysql_tables_in_use drops to zero,
 (a) we execute a COMMIT there if the autocommit is on,
 (b) we also release possible 'SQL statement level resources' InnoDB may
have for this SQL statement. The MySQL interpreter does NOT execute
autocommit for pure read transactions, though it should. That is why the
table handler in that case has to execute the COMMIT in ::external_lock.

  B) If the user has explicitly set MySQL table level locks, then MySQL
does NOT call ::external_lock at the start of the statement. To determine
when we are at the start of a new SQL statement we at the start of
::index_read also compare the query id to the latest query id where the
table handle instance was used. If it has changed, we know we are at the
start of a new SQL statement. Since the query id can theoretically
overwrap, we use this test only as a secondary way of determining the
start of a new SQL statement. */


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/**************************************************************************
Positions an index cursor to the index specified in the handle. Fetches the
row if any. */

int
ha_innobase::index_read(
/*====================*/
					/* out: 0, HA_ERR_KEY_NOT_FOUND,
					or error number */
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	mysql_byte*		buf,	/* in/out: buffer for the returned
3075
					row */
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	const mysql_byte* 	key_ptr,/* in: key value; if this is NULL
3077
					we position the cursor at the
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					start or end of index; this can
					also contain an InnoDB row id, in
					which case key_len is the InnoDB
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					row id length; the key value can
					also be a prefix of a full key value,
					and the last column can be a prefix
					of a full column */
3085
	uint			key_len,/* in: key value length */
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	enum ha_rkey_function find_flag)/* in: search flags from my_base.h */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	ulint		mode;
	dict_index_t*	index;
	ulint		match_mode 	= 0;
	int 		error;
	ulint		ret;

  	DBUG_ENTER("index_read");
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	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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  	statistic_increment(current_thd->status_var.ha_read_key_count,
			    &LOCK_status);
3102

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	if (last_query_id != user_thd->query_id) {
	        prebuilt->sql_stat_start = TRUE;
                last_query_id = user_thd->query_id;
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		innobase_release_stat_resources(prebuilt->trx);
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	}

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	index = prebuilt->index;
3111

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	/* Note that if the index for which the search template is built is not
        necessarily prebuilt->index, but can also be the clustered index */
3114

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	if (prebuilt->sql_stat_start) {
		build_template(prebuilt, user_thd, table,
							ROW_MYSQL_REC_FIELDS);
	}
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	if (key_ptr) {
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	        /* Convert the search key value to InnoDB format into
		prebuilt->search_tuple */

3124
		row_sel_convert_mysql_key_to_innobase(prebuilt->search_tuple,
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					(byte*) key_val_buff,
					(ulint)upd_and_key_val_buff_len,
					index,
					(byte*) key_ptr,
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					(ulint) key_len, prebuilt->trx);
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	} else {
		/* We position the cursor to the last or the first entry
		in the index */

 		dtuple_set_n_fields(prebuilt->search_tuple, 0);
	}
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	mode = convert_search_mode_to_innobase(find_flag);

	match_mode = 0;

	if (find_flag == HA_READ_KEY_EXACT) {
		match_mode = ROW_SEL_EXACT;

	} else if (find_flag == HA_READ_PREFIX
				|| find_flag == HA_READ_PREFIX_LAST) {
		match_mode = ROW_SEL_EXACT_PREFIX;
	}

	last_match_mode = match_mode;

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	innodb_srv_conc_enter_innodb(prebuilt->trx);
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	ret = row_search_for_mysql((byte*) buf, mode, prebuilt, match_mode, 0);
3154

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	innodb_srv_conc_exit_innodb(prebuilt->trx);
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	if (ret == DB_SUCCESS) {
		error = 0;
		table->status = 0;

	} else if (ret == DB_RECORD_NOT_FOUND) {
		error = HA_ERR_KEY_NOT_FOUND;
		table->status = STATUS_NOT_FOUND;

	} else if (ret == DB_END_OF_INDEX) {
		error = HA_ERR_KEY_NOT_FOUND;
		table->status = STATUS_NOT_FOUND;
	} else {
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		error = convert_error_code_to_mysql(ret, user_thd);
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		table->status = STATUS_NOT_FOUND;
	}
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	DBUG_RETURN(error);
}

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/***********************************************************************
The following functions works like index_read, but it find the last
row with the current key value or prefix. */
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int
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ha_innobase::index_read_last(
/*=========================*/
			           /* out: 0, HA_ERR_KEY_NOT_FOUND, or an
				   error code */
        mysql_byte*       buf,     /* out: fetched row */
        const mysql_byte* key_ptr, /* in: key value, or a prefix of a full
				   key value */
	uint              key_len) /* in: length of the key val or prefix
				   in bytes */
3190
{
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        return(index_read(buf, key_ptr, key_len, HA_READ_PREFIX_LAST));
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}

3194
/************************************************************************
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Changes the active index of a handle. */
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int
ha_innobase::change_active_index(
/*=============================*/
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			/* out: 0 or error code */
	uint 	keynr)	/* in: use this index; MAX_KEY means always clustered
			index, even if it was internally generated by
3203
			InnoDB */
3204
{
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	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	KEY*		key=0;
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	statistic_increment(current_thd->status_var.ha_read_key_count,
			    &LOCK_status);
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	DBUG_ENTER("change_active_index");
3210

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	ut_ad(user_thd == current_thd);
	ut_ad(prebuilt->trx ==
	     (trx_t*) current_thd->transaction.all.innobase_tid);
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	active_index = keynr;
3216

3217
	if (keynr != MAX_KEY && table->s->keys > 0) {
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		key = table->key_info + active_index;
3219

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		prebuilt->index = dict_table_get_index_noninline(
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						     prebuilt->table,
						     key->name);
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        } else {
		prebuilt->index = dict_table_get_first_index_noninline(
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							   prebuilt->table);
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	}
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	if (!prebuilt->index) {
	       sql_print_error(
"Innodb could not find key n:o %u with name %s from dict cache for table %s",
	      keynr, key ? key->name : "NULL", prebuilt->table->name);
	      DBUG_RETURN(1);
	}
3234

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	assert(prebuilt->search_tuple != 0);
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	dtuple_set_n_fields(prebuilt->search_tuple, prebuilt->index->n_fields);
3238

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	dict_index_copy_types(prebuilt->search_tuple, prebuilt->index,
3240
			prebuilt->index->n_fields);
3241

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	/* MySQL changes the active index for a handle also during some
	queries, for example SELECT MAX(a), SUM(a) first retrieves the MAX()
	and then calculates the sum. Previously we played safe and used
	the flag ROW_MYSQL_WHOLE_ROW below, but that caused unnecessary
	copying. Starting from MySQL-4.1 we use a more efficient flag here. */
3247

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	build_template(prebuilt, user_thd, table, ROW_MYSQL_REC_FIELDS);
3249

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	DBUG_RETURN(0);
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}

/**************************************************************************
Positions an index cursor to the index specified in keynr. Fetches the
row if any. */
/* ??? This is only used to read whole keys ??? */

int
ha_innobase::index_read_idx(
/*========================*/
					/* out: error number or 0 */
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	mysql_byte*	buf,		/* in/out: buffer for the returned
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					row */
	uint 		keynr,		/* in: use this index */
3265
	const mysql_byte* key,		/* in: key value; if this is NULL
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					we position the cursor at the
					start or end of index */
	uint		key_len,	/* in: key value length */
	enum ha_rkey_function find_flag)/* in: search flags from my_base.h */
{
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	if (change_active_index(keynr)) {

		return(1);
	}
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	return(index_read(buf, key, key_len, find_flag));
}

/***************************************************************************
Reads the next or previous row from a cursor, which must have previously been
positioned using index_read. */

int
ha_innobase::general_fetch(
/*=======================*/
				/* out: 0, HA_ERR_END_OF_FILE, or error
				number */
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	mysql_byte* 	buf,	/* in/out: buffer for next row in MySQL
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				format */
	uint 	direction,	/* in: ROW_SEL_NEXT or ROW_SEL_PREV */
	uint	match_mode)	/* in: 0, ROW_SEL_EXACT, or
				ROW_SEL_EXACT_PREFIX */
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	ulint		ret;
	int		error	= 0;
3297

3298
	DBUG_ENTER("general_fetch");
3299

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	ut_ad(prebuilt->trx ==
	     (trx_t*) current_thd->transaction.all.innobase_tid);
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	innodb_srv_conc_enter_innodb(prebuilt->trx);
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	ret = row_search_for_mysql((byte*)buf, 0, prebuilt, match_mode,
								direction);
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	innodb_srv_conc_exit_innodb(prebuilt->trx);
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	if (ret == DB_SUCCESS) {
		error = 0;
		table->status = 0;

	} else if (ret == DB_RECORD_NOT_FOUND) {
		error = HA_ERR_END_OF_FILE;
		table->status = STATUS_NOT_FOUND;

	} else if (ret == DB_END_OF_INDEX) {
		error = HA_ERR_END_OF_FILE;
		table->status = STATUS_NOT_FOUND;
	} else {
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		error = convert_error_code_to_mysql(ret, user_thd);
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		table->status = STATUS_NOT_FOUND;
	}
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	DBUG_RETURN(error);
}

/***************************************************************************
Reads the next row from a cursor, which must have previously been
positioned using index_read. */

int
ha_innobase::index_next(
/*====================*/
				/* out: 0, HA_ERR_END_OF_FILE, or error
				number */
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	mysql_byte* 	buf)	/* in/out: buffer for next row in MySQL
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				format */
{
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  	statistic_increment(current_thd->status_var.ha_read_next_count,
			    &LOCK_status);
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	return(general_fetch(buf, ROW_SEL_NEXT, 0));
}

/***********************************************************************
Reads the next row matching to the key value given as the parameter. */

int
ha_innobase::index_next_same(
/*=========================*/
				/* out: 0, HA_ERR_END_OF_FILE, or error
				number */
3354 3355
	mysql_byte* 	buf,	/* in/out: buffer for the row */
	const mysql_byte* key,	/* in: key value */
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	uint 		keylen)	/* in: key value length */
{
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  	statistic_increment(current_thd->status_var.ha_read_next_count,
			    &LOCK_status);
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	return(general_fetch(buf, ROW_SEL_NEXT, last_match_mode));
}

/***************************************************************************
Reads the previous row from a cursor, which must have previously been
positioned using index_read. */

int
ha_innobase::index_prev(
/*====================*/
				/* out: 0, HA_ERR_END_OF_FILE, or error
				number */
3373
	mysql_byte* 	buf)	/* in/out: buffer for previous row in MySQL
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				format */
{
	return(general_fetch(buf, ROW_SEL_PREV, 0));
}

/************************************************************************
Positions a cursor on the first record in an index and reads the
corresponding row to buf. */

int
ha_innobase::index_first(
/*=====================*/
3386
				/* out: 0, HA_ERR_END_OF_FILE,
3387 3388
				or error code */
	mysql_byte*	buf)	/* in/out: buffer for the row */
3389 3390 3391 3392
{
	int	error;

  	DBUG_ENTER("index_first");
3393 3394
  	statistic_increment(current_thd->status_var.ha_read_first_count,
			    &LOCK_status);
3395 3396 3397

  	error = index_read(buf, NULL, 0, HA_READ_AFTER_KEY);

3398 3399 3400 3401 3402 3403
        /* MySQL does not seem to allow this to return HA_ERR_KEY_NOT_FOUND */

  	if (error == HA_ERR_KEY_NOT_FOUND) {
  		error = HA_ERR_END_OF_FILE;
  	}

3404 3405 3406 3407 3408 3409 3410 3411 3412 3413
  	DBUG_RETURN(error);
}

/************************************************************************
Positions a cursor on the last record in an index and reads the
corresponding row to buf. */

int
ha_innobase::index_last(
/*====================*/
3414 3415
				/* out: 0, HA_ERR_END_OF_FILE, or error code */
	mysql_byte*	buf)	/* in/out: buffer for the row */
3416 3417 3418
{
	int	error;

3419
  	DBUG_ENTER("index_last");
3420 3421
  	statistic_increment(current_thd->status_var.ha_read_last_count,
			    &LOCK_status);
3422 3423 3424

  	error = index_read(buf, NULL, 0, HA_READ_BEFORE_KEY);

3425
        /* MySQL does not seem to allow this to return HA_ERR_KEY_NOT_FOUND */
3426 3427 3428 3429 3430 3431 3432 3433 3434 3435 3436 3437 3438 3439 3440

  	if (error == HA_ERR_KEY_NOT_FOUND) {
  		error = HA_ERR_END_OF_FILE;
  	}

  	DBUG_RETURN(error);
}

/********************************************************************
Initialize a table scan. */

int
ha_innobase::rnd_init(
/*==================*/
			/* out: 0 or error number */
3441
	bool	scan)	/* in: ???????? */
3442
{
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Merge  
monty@donna.mysql.fi committed
3443
	int	err;
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3444

3445
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
3446

3447 3448 3449
	/* Store the active index value so that we can restore the original
	value after a scan */

3450
	if (prebuilt->clust_index_was_generated) {
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Merge  
monty@donna.mysql.fi committed
3451
		err = change_active_index(MAX_KEY);
3452
	} else {
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Merge  
monty@donna.mysql.fi committed
3453
		err = change_active_index(primary_key);
3454
	}
3455

3456
  	start_of_scan = 1;
3457

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Merge  
monty@donna.mysql.fi committed
3458
 	return(err);
3459 3460 3461
}

/*********************************************************************
3462
Ends a table scan. */
3463 3464 3465 3466 3467 3468

int
ha_innobase::rnd_end(void)
/*======================*/
				/* out: 0 or error number */
{
3469
	return(index_end());
3470 3471 3472 3473 3474 3475 3476 3477 3478 3479
}

/*********************************************************************
Reads the next row in a table scan (also used to read the FIRST row
in a table scan). */

int
ha_innobase::rnd_next(
/*==================*/
			/* out: 0, HA_ERR_END_OF_FILE, or error number */
3480
	mysql_byte* buf)/* in/out: returns the row in this buffer,
3481 3482
			in MySQL format */
{
3483
	int	error;
3484 3485

  	DBUG_ENTER("rnd_next");
3486 3487
  	statistic_increment(current_thd->status_var.ha_read_rnd_next_count,
			    &LOCK_status);
3488

3489
  	if (start_of_scan) {
3490 3491 3492 3493
		error = index_first(buf);
		if (error == HA_ERR_KEY_NOT_FOUND) {
			error = HA_ERR_END_OF_FILE;
		}
3494
		start_of_scan = 0;
3495
	} else {
3496
		error = general_fetch(buf, ROW_SEL_NEXT, 0);
3497
	}
3498

3499 3500 3501 3502
  	DBUG_RETURN(error);
}

/**************************************************************************
3503
Fetches a row from the table based on a row reference. */
3504

3505 3506 3507
int
ha_innobase::rnd_pos(
/*=================*/
3508 3509 3510
				/* out: 0, HA_ERR_KEY_NOT_FOUND,
				or error code */
	mysql_byte* 	buf,	/* in/out: buffer for the row */
3511 3512 3513 3514 3515
	mysql_byte*	pos)	/* in: primary key value of the row in the
				MySQL format, or the row id if the clustered
				index was internally generated by InnoDB;
				the length of data in pos has to be
				ref_length */
3516
{
3517 3518 3519
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	int		error;
	uint		keynr	= active_index;
3520
	DBUG_ENTER("rnd_pos");
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3521
	DBUG_DUMP("key", (char*) pos, ref_length);
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3522

3523 3524
	statistic_increment(current_thd->status_var.ha_read_rnd_count,
			    &LOCK_status);
3525

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heikki@hundin.mysql.fi committed
3526 3527
	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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3528

3529 3530 3531 3532
	if (prebuilt->clust_index_was_generated) {
		/* No primary key was defined for the table and we
		generated the clustered index from the row id: the
		row reference is the row id, not any key value
3533
		that MySQL knows of */
3534

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Merge  
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3535
		error = change_active_index(MAX_KEY);
3536
	} else {
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Merge  
monty@donna.mysql.fi committed
3537
		error = change_active_index(primary_key);
3538
	}
3539

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Merge  
monty@donna.mysql.fi committed
3540
	if (error) {
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3541
	        DBUG_PRINT("error",("Got error: %ld",error));
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3542 3543
		DBUG_RETURN(error);
	}
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3544

3545 3546 3547 3548
	/* Note that we assume the length of the row reference is fixed
        for the table, and it is == ref_length */

	error = index_read(buf, pos, ref_length, HA_READ_KEY_EXACT);
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monty@hundin.mysql.fi committed
3549 3550 3551 3552
	if (error)
	{
	  DBUG_PRINT("error",("Got error: %ld",error));
	}
3553
	change_active_index(keynr);
3554

3555 3556 3557 3558
  	DBUG_RETURN(error);
}

/*************************************************************************
3559
Stores a reference to the current row to 'ref' field of the handle. Note
3560 3561
that in the case where we have generated the clustered index for the
table, the function parameter is illogical: we MUST ASSUME that 'record'
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heikki@hundin.mysql.fi committed
3562
is the current 'position' of the handle, because if row ref is actually
3563
the row id internally generated in InnoDB, then 'record' does not contain
3564 3565
it. We just guess that the row id must be for the record where the handle
was positioned the last time. */
3566 3567 3568 3569

void
ha_innobase::position(
/*==================*/
3570
	const mysql_byte*	record)	/* in: row in MySQL format */
3571
{
3572 3573
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	uint		len;
3574

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3575 3576
	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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heikki@hundin.mysql.fi committed
3577

3578 3579 3580 3581
	if (prebuilt->clust_index_was_generated) {
		/* No primary key was defined for the table and we
		generated the clustered index from row id: the
		row reference will be the row id, not any key value
3582
		that MySQL knows of */
3583 3584 3585 3586 3587

		len = DATA_ROW_ID_LEN;

		memcpy(ref, prebuilt->row_id, len);
	} else {
3588 3589
		len = store_key_val_for_row(primary_key, (char*)ref,
							 ref_length, record);
3590
	}
3591

3592 3593 3594
	/* Since we do not store len to the buffer 'ref', we must assume
	that len is always fixed for this table. The following assertion
	checks this. */
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3595
  
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3596 3597 3598
	if (len != ref_length) {
	        fprintf(stderr,
	 "InnoDB: Error: stored ref len is %lu, but table ref len is %lu\n",
3599
		  (ulong)len, (ulong)ref_length);
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3600
	}
3601 3602 3603
}

/*********************************************************************
3604
Creates a table definition to an InnoDB database. */
3605 3606 3607 3608
static
int
create_table_def(
/*=============*/
3609
	trx_t*		trx,		/* in: InnoDB transaction handle */
3610 3611
	TABLE*		form,		/* in: information on table
					columns and indexes */
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3612
	const char*	table_name,	/* in: table name */
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3613
	const char*	path_of_temp_table,/* in: if this is a table explicitly
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3614 3615 3616 3617 3618 3619 3620
					created by the user with the
					TEMPORARY keyword, then this
					parameter is the dir path where the
					table should be placed if we create
					an .ibd file for it (no .ibd extension
					in the path, though); otherwise this
					is NULL */
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3621
	ibool		comp)		/* in: TRUE=compact record format */
3622 3623 3624 3625 3626 3627
{
	Field*		field;
	dict_table_t*	table;
	ulint		n_cols;
  	int 		error;
  	ulint		col_type;
3628 3629
  	ulint		nulls_allowed;
	ulint		unsigned_type;
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3630
	ulint		binary_type;
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heikki@hundin.mysql.fi committed
3631
	ulint		charset_no;
3632
  	ulint		i;
3633

3634 3635 3636
  	DBUG_ENTER("create_table_def");
  	DBUG_PRINT("enter", ("table_name: %s", table_name));

3637
	n_cols = form->s->fields;
3638

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3639 3640
	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */
3641

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3642
	table = dict_mem_table_create(table_name, 0, n_cols, comp);
3643

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3644 3645 3646 3647 3648
	if (path_of_temp_table) {
		table->dir_path_of_temp_table =
			mem_heap_strdup(table->heap, path_of_temp_table);
	}

3649 3650 3651
	for (i = 0; i < n_cols; i++) {
		field = form->field[i];

3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 3663
		col_type = get_innobase_type_from_mysql_type(field);
		if (field->null_ptr) {
			nulls_allowed = 0;
		} else {
			nulls_allowed = DATA_NOT_NULL;
		}

		if (field->flags & UNSIGNED_FLAG) {
			unsigned_type = DATA_UNSIGNED;
		} else {
			unsigned_type = 0;
		}
3664

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3665
		if (field->binary()) {
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3666 3667 3668 3669 3670
			binary_type = DATA_BINARY_TYPE;
		} else {
			binary_type = 0;
		}

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3671 3672 3673 3674 3675 3676 3677 3678 3679 3680
		charset_no = 0;	

		if (dtype_is_string_type(col_type)) {

			charset_no = (ulint)field->charset()->number;

			ut_a(charset_no < 256); /* in ut0type.h we assume that
						the number fits in one byte */
		}

3681
		dict_mem_table_add_col(table, (char*) field->field_name,
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3682 3683
					col_type, dtype_form_prtype( 
					(ulint)field->type()
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3684
					| nulls_allowed | unsigned_type
3685
					| binary_type,
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3686
					+ charset_no),
3687 3688 3689 3690 3691
					field->pack_length(), 0);
	}

	error = row_create_table_for_mysql(table, trx);

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3692
	error = convert_error_code_to_mysql(error, NULL);
3693 3694 3695 3696 3697

	DBUG_RETURN(error);
}

/*********************************************************************
3698
Creates an index in an InnoDB database. */
3699 3700
static
int
3701 3702
create_index(
/*=========*/
3703
	trx_t*		trx,		/* in: InnoDB transaction handle */
3704 3705 3706 3707 3708
	TABLE*		form,		/* in: information on table
					columns and indexes */
	const char*	table_name,	/* in: table name */
	uint		key_num)	/* in: index number */
{
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3709
	Field*		field;
3710
	dict_index_t*	index;
3711
  	int 		error;
3712 3713 3714 3715
	ulint		n_fields;
	KEY*		key;
	KEY_PART_INFO*	key_part;
	ulint		ind_type;
3716 3717
	ulint		col_type;
	ulint		prefix_len;
3718
  	ulint		i;
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heikki@hundin.mysql.fi committed
3719
  	ulint		j;
3720

3721
  	DBUG_ENTER("create_index");
3722

3723 3724 3725
	key = form->key_info + key_num;

    	n_fields = key->key_parts;
3726

3727 3728
    	ind_type = 0;

3729
    	if (key_num == form->s->primary_key) {
3730 3731
		ind_type = ind_type | DICT_CLUSTERED;
	}
3732

3733 3734 3735 3736
	if (key->flags & HA_NOSAME ) {
		ind_type = ind_type | DICT_UNIQUE;
	}

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3737 3738
	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */
3739 3740 3741 3742 3743 3744

	index = dict_mem_index_create((char*) table_name, key->name, 0,
						ind_type, n_fields);
	for (i = 0; i < n_fields; i++) {
		key_part = key->key_part + i;

3745
		/* (The flag HA_PART_KEY_SEG denotes in MySQL a column prefix
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heikki@hundin.mysql.fi committed
3746 3747 3748 3749 3750 3751
		field in an index: we only store a specified number of first
		bytes of the column to the index field.) The flag does not
		seem to be properly set by MySQL. Let us fall back on testing
		the length of the key part versus the column. */
		
		field = NULL;
3752
		for (j = 0; j < form->s->fields; j++) {
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3753 3754 3755

			field = form->field[j];

3756 3757 3758
			if (0 == innobase_strcasecmp(
					field->field_name,
					key_part->field->field_name)) {
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3759 3760 3761 3762 3763 3764
				/* Found the corresponding column */

				break;
			}
		}

3765
		ut_a(j < form->s->fields);
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3766 3767 3768 3769 3770 3771

		col_type = get_innobase_type_from_mysql_type(key_part->field);

		if (DATA_BLOB == col_type
		    || key_part->length < field->pack_length()) {

3772 3773 3774 3775 3776 3777 3778 3779
		        prefix_len = key_part->length;

			if (col_type == DATA_INT
			    || col_type == DATA_FLOAT
			    || col_type == DATA_DOUBLE
			    || col_type == DATA_DECIMAL) {
			        fprintf(stderr,
"InnoDB: error: MySQL is trying to create a column prefix index field\n"
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heikki@hundin.mysql.fi committed
3780 3781
"InnoDB: on an inappropriate data type. Table name %s, column name %s.\n",
				  table_name, key_part->field->field_name);
3782 3783 3784 3785 3786
			        
			        prefix_len = 0;
			}
		} else {
		        prefix_len = 0;
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3787 3788
		}

3789 3790
		/* We assume all fields should be sorted in ascending
		order, hence the '0': */
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3791

3792
		dict_mem_index_add_field(index,
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3793 3794
				(char*) key_part->field->field_name,
				0, prefix_len);
3795 3796 3797 3798
	}

	error = row_create_index_for_mysql(index, trx);

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3799
	error = convert_error_code_to_mysql(error, NULL);
3800 3801 3802 3803 3804

	DBUG_RETURN(error);
}

/*********************************************************************
3805
Creates an index to an InnoDB table when the user has defined no
3806
primary index. */
3807 3808
static
int
3809 3810
create_clustered_index_when_no_primary(
/*===================================*/
3811
	trx_t*		trx,		/* in: InnoDB transaction handle */
3812 3813 3814
	const char*	table_name)	/* in: table name */
{
	dict_index_t*	index;
3815 3816
  	int 		error;

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3817 3818
	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */
3819

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3820 3821 3822
	index = dict_mem_index_create((char*) table_name,
				      (char*) "GEN_CLUST_INDEX",
				      0, DICT_CLUSTERED, 0);
3823 3824
	error = row_create_index_for_mysql(index, trx);

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3825
	error = convert_error_code_to_mysql(error, NULL);
3826

3827
	return(error);
3828 3829 3830
}

/*********************************************************************
3831
Creates a new table to an InnoDB database. */
3832 3833 3834 3835 3836 3837 3838 3839

int
ha_innobase::create(
/*================*/
					/* out: error number */
	const char*	name,		/* in: table name */
	TABLE*		form,		/* in: information on table
					columns and indexes */
3840 3841 3842
	HA_CREATE_INFO*	create_info)	/* in: more information of the
					created table, contains also the
					create statement string */
3843 3844 3845
{
	int		error;
	dict_table_t*	innobase_table;
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3846
	trx_t*		parent_trx;
3847
	trx_t*		trx;
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3848
	int		primary_key_no;
3849
	uint		i;
3850 3851
	char		name2[FN_REFLEN];
	char		norm_name[FN_REFLEN];
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3852
	THD		*thd= current_thd;
3853
	ib_longlong     auto_inc_value;
3854

3855 3856
  	DBUG_ENTER("ha_innobase::create");

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3857
	DBUG_ASSERT(thd != NULL);
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3858

3859
	if (form->s->fields > 1000) {
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3860 3861 3862
		/* The limit probably should be REC_MAX_N_FIELDS - 3 = 1020,
		but we play safe here */

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3863
	        DBUG_RETURN(HA_ERR_TO_BIG_ROW);
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3864 3865
	} 

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	/* Get the transaction associated with the current thd, or create one
	if not yet created */
	
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3869
	parent_trx = check_trx_exists(current_thd);
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3870 3871 3872 3873 3874 3875

	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(parent_trx);	
	
3876
	trx = trx_allocate_for_mysql();
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3877 3878 3879
		
	trx->mysql_thd = thd;
	trx->mysql_query_str = &((*thd).query);
3880

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3881
	if (thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
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3882 3883 3884
		trx->check_foreigns = FALSE;
	}

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3885
	if (thd->options & OPTION_RELAXED_UNIQUE_CHECKS) {
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		trx->check_unique_secondary = FALSE;
	}

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3889 3890 3891 3892 3893
	if (lower_case_table_names) {
		srv_lower_case_table_names = TRUE;
	} else {
		srv_lower_case_table_names = FALSE;
	}
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monty@mashka.mysql.fi committed
3894

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heikki@hundin.mysql.fi committed
3895
	fn_format(name2, name, "", "", 2);	// Remove the .frm extension
3896 3897

	normalize_table_name(norm_name, name2);
3898

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heikki@hundin.mysql.fi committed
3899
	/* Latch the InnoDB data dictionary exclusively so that no deadlocks
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heikki@hundin.mysql.fi committed
3900
	or lock waits can happen in it during a table create operation.
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heikki@hundin.mysql.fi committed
3901
	Drop table etc. do this latching in row0mysql.c. */
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3902

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heikki@hundin.mysql.fi committed
3903
	row_mysql_lock_data_dictionary(trx);
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heikki@hundin.mysql.fi committed
3904 3905

	/* Create the table definition in InnoDB */
3906

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marko@hundin.mysql.fi committed
3907 3908
	error = create_table_def(trx, form, norm_name,
		create_info->options & HA_LEX_CREATE_TMP_TABLE ? name2 : NULL,
3909
		form->s->row_type != ROW_TYPE_REDUNDANT);
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heikki@hundin.mysql.fi committed
3910

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heikki@hundin.mysql.fi committed
3911
  	if (error) {
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heikki@hundin.mysql.fi committed
3912
		innobase_commit_low(trx);
3913

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3914
		row_mysql_unlock_data_dictionary(trx);
3915 3916 3917 3918 3919 3920

  		trx_free_for_mysql(trx);

 		DBUG_RETURN(error);
 	}

3921 3922
	/* Look for a primary key */

3923 3924
	primary_key_no= (table->s->primary_key != MAX_KEY ?
			 (int) table->s->primary_key : 
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3925
			 -1);
3926

3927 3928 3929
	/* Our function row_get_mysql_key_number_for_index assumes
	the primary key is always number 0, if it exists */

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3930
	DBUG_ASSERT(primary_key_no == -1 || primary_key_no == 0);
3931

3932 3933
	/* Create the keys */

3934
	if (form->s->keys == 0 || primary_key_no == -1) {
3935 3936
		/* Create an index which is used as the clustered index;
		order the rows by their row id which is internally generated
3937
		by InnoDB */
3938

3939
		error = create_clustered_index_when_no_primary(trx,
3940
							norm_name);
3941
  		if (error) {
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3942 3943
			innobase_commit_low(trx);

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3944
			row_mysql_unlock_data_dictionary(trx);
3945

3946 3947 3948 3949
			trx_free_for_mysql(trx);

			DBUG_RETURN(error);
      		}
3950 3951 3952
	}

	if (primary_key_no != -1) {
3953
		/* In InnoDB the clustered index must always be created
3954
		first */
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3955 3956
	    	if ((error = create_index(trx, form, norm_name,
					  (uint) primary_key_no))) {
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heikki@hundin.mysql.fi committed
3957 3958
			innobase_commit_low(trx);

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3959
			row_mysql_unlock_data_dictionary(trx);
3960 3961 3962 3963 3964 3965 3966

  			trx_free_for_mysql(trx);

			DBUG_RETURN(error);
      		}
      	}

3967
	for (i = 0; i < form->s->keys; i++) {
3968 3969 3970

		if (i != (uint) primary_key_no) {

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monty@donna.mysql.fi committed
3971
    			if ((error = create_index(trx, form, norm_name, i))) {
3972

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monty@mashka.mysql.fi committed
3973
			  	innobase_commit_low(trx);
3974

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heikki@hundin.mysql.fi committed
3975
				row_mysql_unlock_data_dictionary(trx);
3976 3977 3978 3979 3980

  				trx_free_for_mysql(trx);

				DBUG_RETURN(error);
      			}
3981
      		}
3982
  	}
3983

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heikki@hundin.mysql.fi committed
3984
	if (current_thd->query != NULL) {
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marko@hundin.mysql.fi committed
3985
		LEX_STRING q;
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3986

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3987 3988 3989 3990 3991 3992 3993 3994 3995 3996 3997
		if (thd->convert_string(&q, system_charset_info,
					current_thd->query,
					current_thd->query_length,
					current_thd->charset())) {
			error = HA_ERR_OUT_OF_MEM;
		} else {
			error = row_table_add_foreign_constraints(trx,
					q.str, norm_name);

			error = convert_error_code_to_mysql(error, NULL);
		}
3998

3999 4000
		if (error) {
			innobase_commit_low(trx);
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heikki@hundin.mysql.fi committed
4001

4002
			row_mysql_unlock_data_dictionary(trx);
4003

4004
  			trx_free_for_mysql(trx);
4005

4006 4007
			DBUG_RETURN(error);
		}
4008 4009
	}

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heikki@hundin.mysql.fi committed
4010 4011
  	innobase_commit_low(trx);

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heikki@hundin.mysql.fi committed
4012
	row_mysql_unlock_data_dictionary(trx);
4013

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Merge  
monty@donna.mysql.fi committed
4014 4015 4016
	/* Flush the log to reduce probability that the .frm files and
	the InnoDB data dictionary get out-of-sync if the user runs
	with innodb_flush_log_at_trx_commit = 0 */
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monty@hundin.mysql.fi committed
4017

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heikki@hundin.mysql.fi committed
4018
	log_buffer_flush_to_disk();
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Merge  
monty@donna.mysql.fi committed
4019

4020
	innobase_table = dict_table_get(norm_name, NULL);
4021

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monty@hundin.mysql.fi committed
4022
	DBUG_ASSERT(innobase_table != 0);
4023

4024
	if ((thd->lex->create_info.used_fields & HA_CREATE_USED_AUTO) &&
4025 4026
	   (thd->lex->create_info.auto_increment_value != 0)) {

4027 4028
		/* Query was ALTER TABLE...AUTO_INCREMENT = x; or 
		CREATE TABLE ...AUTO_INCREMENT = x; Find out a table
4029 4030
		definition from the dictionary and get the current value
		of the auto increment field. Set a new value to the
4031 4032
		auto increment field if the value is greater than the
		maximum value in the column. */
4033 4034 4035 4036 4037

		auto_inc_value = thd->lex->create_info.auto_increment_value;
		dict_table_autoinc_initialize(innobase_table, auto_inc_value);
	}

4038
	/* Tell the InnoDB server that there might be work for
4039 4040 4041 4042 4043 4044 4045 4046 4047
	utility threads: */

	srv_active_wake_master_thread();

  	trx_free_for_mysql(trx);

	DBUG_RETURN(0);
}

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4048 4049 4050 4051 4052 4053 4054 4055 4056 4057
/*********************************************************************
Discards or imports an InnoDB tablespace. */

int
ha_innobase::discard_or_import_tablespace(
/*======================================*/
				/* out: 0 == success, -1 == error */
	my_bool discard)	/* in: TRUE if discard, else import */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
4058
	dict_table_t*	dict_table;
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4059 4060 4061 4062 4063 4064 4065 4066 4067
	trx_t*		trx;
	int		err;

 	DBUG_ENTER("ha_innobase::discard_or_import_tablespace");

	ut_a(prebuilt->trx && prebuilt->trx->magic_n == TRX_MAGIC_N);
	ut_a(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);

4068
	dict_table = prebuilt->table;
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4069 4070 4071
	trx = prebuilt->trx;

	if (discard) {
4072
		err = row_discard_tablespace_for_mysql(dict_table->name, trx);
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4073
	} else {
4074
		err = row_import_tablespace_for_mysql(dict_table->name, trx);
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4075 4076
	}

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4077
	err = convert_error_code_to_mysql(err, NULL);
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4078

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4079
	DBUG_RETURN(err);
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4080 4081
}

4082
/*********************************************************************
4083
Drops a table from an InnoDB database. Before calling this function,
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monty@donna.mysql.com committed
4084 4085
MySQL calls innobase_commit to commit the transaction of the current user.
Then the current user cannot have locks set on the table. Drop table
4086 4087
operation inside InnoDB will remove all locks any user has on the table
inside InnoDB. */
4088 4089 4090 4091

int
ha_innobase::delete_table(
/*======================*/
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4092 4093
				/* out: error number */
	const char*	name)	/* in: table name */
4094 4095 4096
{
	ulint	name_len;
	int	error;
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4097
	trx_t*	parent_trx;
4098
	trx_t*	trx;
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4099
	THD     *thd= current_thd;
4100
	char	norm_name[1000];
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4101

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4102
 	DBUG_ENTER("ha_innobase::delete_table");
4103

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4104 4105 4106
	/* Get the transaction associated with the current thd, or create one
	if not yet created */
	
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4107
	parent_trx = check_trx_exists(current_thd);
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4108 4109 4110 4111 4112 4113

	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(parent_trx);	

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4114 4115 4116 4117 4118 4119
	if (lower_case_table_names) {
		srv_lower_case_table_names = TRUE;
	} else {
		srv_lower_case_table_names = FALSE;
	}

4120 4121
	trx = trx_allocate_for_mysql();

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4122 4123
	trx->mysql_thd = current_thd;
	trx->mysql_query_str = &((*current_thd).query);
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4124

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4125 4126 4127 4128 4129 4130 4131 4132
	if (thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
		trx->check_foreigns = FALSE;
	}

	if (thd->options & OPTION_RELAXED_UNIQUE_CHECKS) {
		trx->check_unique_secondary = FALSE;
	}

4133 4134 4135
	name_len = strlen(name);

	assert(name_len < 1000);
4136

4137 4138
	/* Strangely, MySQL passes the table name without the '.frm'
	extension, in contrast to ::create */
4139

4140 4141
	normalize_table_name(norm_name, name);

4142
  	/* Drop the table in InnoDB */
4143

4144
	error = row_drop_table_for_mysql(norm_name, trx,
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monty@mishka.local committed
4145
		thd->lex->sql_command == SQLCOM_DROP_DB);
4146

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Merge  
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4147 4148 4149
	/* Flush the log to reduce probability that the .frm files and
	the InnoDB data dictionary get out-of-sync if the user runs
	with innodb_flush_log_at_trx_commit = 0 */
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monty@hundin.mysql.fi committed
4150

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heikki@hundin.mysql.fi committed
4151
	log_buffer_flush_to_disk();
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Merge  
monty@donna.mysql.fi committed
4152

4153
	/* Tell the InnoDB server that there might be work for
4154 4155 4156 4157
	utility threads: */

	srv_active_wake_master_thread();

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heikki@hundin.mysql.fi committed
4158
  	innobase_commit_low(trx);
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4159

4160 4161
  	trx_free_for_mysql(trx);

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4162
	error = convert_error_code_to_mysql(error, NULL);
4163 4164 4165 4166

	DBUG_RETURN(error);
}

4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179
/*********************************************************************
Removes all tables in the named database inside InnoDB. */

int
innobase_drop_database(
/*===================*/
			/* out: error number */
	char*	path)	/* in: database path; inside InnoDB the name
			of the last directory in the path is used as
			the database name: for example, in 'mysql/data/test'
			the database name is 'test' */
{
	ulint	len		= 0;
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	trx_t*	parent_trx;
4181 4182 4183
	trx_t*	trx;
	char*	ptr;
	int	error;
4184
	char*	namebuf;
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	/* Get the transaction associated with the current thd, or create one
	if not yet created */
	
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4189
	parent_trx = check_trx_exists(current_thd);
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	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(parent_trx);	

4196
	ptr = strend(path) - 2;
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4197

4198 4199 4200 4201 4202 4203
	while (ptr >= path && *ptr != '\\' && *ptr != '/') {
		ptr--;
		len++;
	}

	ptr++;
4204
	namebuf = my_malloc(len + 2, MYF(0));
4205 4206 4207 4208

	memcpy(namebuf, ptr, len);
	namebuf[len] = '/';
	namebuf[len + 1] = '\0';
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4209
#ifdef  __WIN__
4210
	innobase_casedn_str(namebuf);
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4211
#endif
4212
	trx = trx_allocate_for_mysql();
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4213 4214
	trx->mysql_thd = current_thd;
	trx->mysql_query_str = &((*current_thd).query);
4215

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4216 4217 4218 4219
	if (current_thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
		trx->check_foreigns = FALSE;
	}

4220
  	error = row_drop_database_for_mysql(namebuf, trx);
4221
	my_free(namebuf, MYF(0));
4222

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Merge  
monty@donna.mysql.fi committed
4223 4224 4225
	/* Flush the log to reduce probability that the .frm files and
	the InnoDB data dictionary get out-of-sync if the user runs
	with innodb_flush_log_at_trx_commit = 0 */
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monty@hundin.mysql.fi committed
4226

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heikki@hundin.mysql.fi committed
4227
	log_buffer_flush_to_disk();
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Merge  
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4228

4229 4230 4231 4232 4233
	/* Tell the InnoDB server that there might be work for
	utility threads: */

	srv_active_wake_master_thread();

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4234
  	innobase_commit_low(trx);
4235 4236
  	trx_free_for_mysql(trx);

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4237
	error = convert_error_code_to_mysql(error, NULL);
4238 4239 4240 4241

	return(error);
}

4242
/*************************************************************************
4243
Renames an InnoDB table. */
4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 4254

int
ha_innobase::rename_table(
/*======================*/
				/* out: 0 or error code */
	const char*	from,	/* in: old name of the table */
	const char*	to)	/* in: new name of the table */
{
	ulint	name_len1;
	ulint	name_len2;
	int	error;
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	trx_t*	parent_trx;
4256
	trx_t*	trx;
4257 4258
	char	norm_from[1000];
	char	norm_to[1000];
4259

4260 4261
  	DBUG_ENTER("ha_innobase::rename_table");

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	/* Get the transaction associated with the current thd, or create one
	if not yet created */
	
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4265
	parent_trx = check_trx_exists(current_thd);
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	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(parent_trx);	

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	if (lower_case_table_names) {
		srv_lower_case_table_names = TRUE;
	} else {
		srv_lower_case_table_names = FALSE;
	}

4278
	trx = trx_allocate_for_mysql();
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	trx->mysql_thd = current_thd;
	trx->mysql_query_str = &((*current_thd).query);
4281 4282 4283 4284 4285 4286

	name_len1 = strlen(from);
	name_len2 = strlen(to);

	assert(name_len1 < 1000);
	assert(name_len2 < 1000);
4287

4288 4289 4290
	normalize_table_name(norm_from, from);
	normalize_table_name(norm_to, to);

4291
  	/* Rename the table in InnoDB */
4292

4293
  	error = row_rename_table_for_mysql(norm_from, norm_to, trx);
4294

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Merge  
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4295 4296 4297
	/* Flush the log to reduce probability that the .frm files and
	the InnoDB data dictionary get out-of-sync if the user runs
	with innodb_flush_log_at_trx_commit = 0 */
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	log_buffer_flush_to_disk();
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Merge  
monty@donna.mysql.fi committed
4300

4301
	/* Tell the InnoDB server that there might be work for
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	utility threads: */

	srv_active_wake_master_thread();

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  	innobase_commit_low(trx);
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  	trx_free_for_mysql(trx);

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	error = convert_error_code_to_mysql(error, NULL);
4310 4311 4312 4313 4314 4315 4316 4317 4318 4319

	DBUG_RETURN(error);
}

/*************************************************************************
Estimates the number of index records in a range. */

ha_rows
ha_innobase::records_in_range(
/*==========================*/
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						/* out: estimated number of
						rows */
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	uint 			keynr,		/* in: index number */
        key_range		*min_key,	/* in: start key value of the
                                                   range, may also be 0 */
	key_range		*max_key)	/* in: range end key val, may
                                                   also be 0 */
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{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	KEY*		key;
	dict_index_t*	index;
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	mysql_byte*	key_val_buff2 	= (mysql_byte*) my_malloc(
4332 4333
						  table->s->reclength
      						+ table->s->max_key_length + 100,
4334
								MYF(MY_WME));
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	ulint		buff2_len = table->s->reclength
      						+ table->s->max_key_length + 100;
4337
	dtuple_t*	range_start;
4338
	dtuple_t*	range_end;
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	ib_longlong	n_rows;
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	ulint		mode1;
	ulint		mode2;
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	void*           heap1;
	void*           heap2;
4344

4345
   	DBUG_ENTER("records_in_range");
4346

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	prebuilt->trx->op_info = (char*)"estimating records in index range";

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	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(prebuilt->trx);
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	active_index = keynr;

	key = table->key_info + active_index;
4357

4358
	index = dict_table_get_index_noninline(prebuilt->table, key->name);
4359

4360
	range_start = dtuple_create_for_mysql(&heap1, key->key_parts);
4361
 	dict_index_copy_types(range_start, index, key->key_parts);
4362

4363
	range_end = dtuple_create_for_mysql(&heap2, key->key_parts);
4364
 	dict_index_copy_types(range_end, index, key->key_parts);
4365

4366
	row_sel_convert_mysql_key_to_innobase(
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				range_start, (byte*) key_val_buff,
				(ulint)upd_and_key_val_buff_len,
				index,
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				(byte*) (min_key ? min_key->key :
                                         (const mysql_byte*) 0),
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				(ulint) (min_key ? min_key->length : 0),
				prebuilt->trx);
4374

4375
	row_sel_convert_mysql_key_to_innobase(
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				range_end, (byte*) key_val_buff2,
				buff2_len, index,
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				(byte*) (max_key ? max_key->key :
                                         (const mysql_byte*) 0),
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				(ulint) (max_key ? max_key->length : 0),
				prebuilt->trx);
4382 4383 4384 4385 4386

	mode1 = convert_search_mode_to_innobase(min_key ? min_key->flag :
                                                HA_READ_KEY_EXACT);
	mode2 = convert_search_mode_to_innobase(max_key ? max_key->flag :
                                                HA_READ_KEY_EXACT);
4387

4388
	n_rows = btr_estimate_n_rows_in_range(index, range_start,
4389
						mode1, range_end, mode2);
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	dtuple_free_for_mysql(heap1);
	dtuple_free_for_mysql(heap2);
4392

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    	my_free((char*) key_val_buff2, MYF(0));

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	prebuilt->trx->op_info = (char*)"";

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	/* The MySQL optimizer seems to believe an estimate of 0 rows is
	always accurate and may return the result 'Empty set' based on that.
	The accuracy is not guaranteed, and even if it were, for a locking
	read we should anyway perform the search to set the next-key lock.
	Add 1 to the value to make sure MySQL does not make the assumption! */

	if (n_rows == 0) {
	        n_rows = 1;
	}

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	DBUG_RETURN((ha_rows) n_rows);
}

4410 4411
/*************************************************************************
Gives an UPPER BOUND to the number of rows in a table. This is used in
4412
filesort.cc. */
4413 4414

ha_rows
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4415
ha_innobase::estimate_rows_upper_bound(void)
4416
/*======================================*/
4417
			/* out: upper bound of rows */
4418 4419
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
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	dict_index_t*	index;
	ulonglong	estimate;
4422
	ulonglong	local_data_file_length;
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4424
 	DBUG_ENTER("estimate_rows_upper_bound");
4425

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	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

	update_thd(current_thd);

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	prebuilt->trx->op_info = (char*)
	                         "calculating upper bound for table rows";

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	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(prebuilt->trx);
4439

4440
	index = dict_table_get_first_index_noninline(prebuilt->table);
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4441

4442
	local_data_file_length = ((ulonglong) index->stat_n_leaf_pages)
4443
    							* UNIV_PAGE_SIZE;
4444

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4445 4446
	/* Calculate a minimum length for a clustered index record and from
	that an upper bound for the number of rows. Since we only calculate
4447 4448
	new statistics in row0mysql.c when a table has grown by a threshold
	factor, we must add a safety factor 2 in front of the formula below. */
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4449

4450 4451
	estimate = 2 * local_data_file_length /
					 dict_index_calc_min_rec_len(index);
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4452

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	prebuilt->trx->op_info = (char*)"";

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4455
	DBUG_RETURN((ha_rows) estimate);
4456 4457
}

4458 4459 4460 4461 4462 4463 4464 4465 4466 4467 4468 4469
/*************************************************************************
How many seeks it will take to read through the table. This is to be
comparable to the number returned by records_in_range so that we can
decide if we should scan the table or use keys. */

double
ha_innobase::scan_time()
/*====================*/
			/* out: estimated time measured in disk seeks */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;

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	/* Since MySQL seems to favor table scans too much over index
	searches, we pretend that a sequential read takes the same time
	as a random disk read, that is, we do not divide the following
	by 10, which would be physically realistic. */
	
	return((double) (prebuilt->table->stat_clustered_index_size));
4476 4477
}

4478 4479 4480
/**********************************************************************
Calculate the time it takes to read a set of ranges through an index
This enables us to optimise reads for clustered indexes. */
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4481

4482 4483 4484 4485 4486 4487 4488
double
ha_innobase::read_time(
/*===================*/
			/* out: estimated time measured in disk seeks */
	uint    index,	/* in: key number */
	uint	ranges,	/* in: how many ranges */
	ha_rows rows)	/* in: estimated number of rows in the ranges */
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4489
{
4490 4491 4492
	ha_rows total_rows;
	double  time_for_scan;
  
4493
	if (index != table->s->primary_key)
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	  return handler::read_time(index, ranges, rows); // Not clustered

	if (rows <= 2)
	  return (double) rows;

	/* Assume that the read time is proportional to the scan time for all
	rows + at most one seek per range. */

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4502
	time_for_scan = scan_time();
4503

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	if ((total_rows = estimate_rows_upper_bound()) < rows)
4505 4506 4507
	  return time_for_scan;

	return (ranges + (double) rows / (double) total_rows * time_for_scan);
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}

4510 4511 4512 4513 4514 4515 4516 4517 4518 4519 4520 4521
/*************************************************************************
Returns statistics information of the table to the MySQL interpreter,
in various fields of the handle object. */

void
ha_innobase::info(
/*==============*/
	uint flag)	/* in: what information MySQL requests */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	dict_table_t*	ib_table;
	dict_index_t*	index;
4522
	ha_rows		rec_per_key;
4523 4524
	ulong		j;
	ulong		i;
4525 4526
	char		path[FN_REFLEN];
	os_file_stat_t  stat_info;
4527

4528 4529
 	DBUG_ENTER("info");

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4530 4531 4532 4533 4534 4535
        /* If we are forcing recovery at a high level, we will suppress
	statistics calculation on tables, because that may crash the
	server if an index is badly corrupted. */

        if (srv_force_recovery >= SRV_FORCE_NO_IBUF_MERGE) {

4536
                DBUG_VOID_RETURN;
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4537 4538
        }

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	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

	update_thd(current_thd);

	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

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	prebuilt->trx->op_info = (char*)"returning various info to MySQL";

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4550
	trx_search_latch_release_if_reserved(prebuilt->trx);
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4551

4552 4553 4554 4555 4556 4557
 	ib_table = prebuilt->table;

 	if (flag & HA_STATUS_TIME) {
 		/* In sql_show we call with this flag: update then statistics
 		so that they are up-to-date */

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	        prebuilt->trx->op_info = (char*)"updating table statistics";

4560
 		dict_update_statistics(ib_table);
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		prebuilt->trx->op_info = (char*)
		                          "returning various info to MySQL";
4564 4565 4566 4567 4568 4569 4570 4571 4572 4573 4574 4575 4576 4577

		if (ib_table->space != 0) {
			my_snprintf(path, sizeof(path), "%s/%s%s",
				    mysql_data_home, ib_table->name,
				    ".ibd");
			unpack_filename(path,path);
		} else {
			my_snprintf(path, sizeof(path), "%s/%s%s", 
				    mysql_data_home, ib_table->name,
				    reg_ext);
		
			unpack_filename(path,path);
		}

4578 4579 4580
		/* Note that we do not know the access time of the table, 
		nor the CHECK TABLE time, nor the UPDATE or INSERT time. */

4581 4582 4583
		if (os_file_get_status(path,&stat_info)) {
			create_time = stat_info.ctime;
		}
4584 4585 4586
 	}

	if (flag & HA_STATUS_VARIABLE) {
4587
    		records = (ha_rows)ib_table->stat_n_rows;
4588 4589 4590 4591 4592 4593 4594 4595 4596 4597 4598 4599 4600
    		deleted = 0;
    		data_file_length = ((ulonglong)
				ib_table->stat_clustered_index_size)
    					* UNIV_PAGE_SIZE;
    		index_file_length = ((ulonglong)
				ib_table->stat_sum_of_other_index_sizes)
    					* UNIV_PAGE_SIZE;
    		delete_length = 0;
    		check_time = 0;

    		if (records == 0) {
    			mean_rec_length = 0;
    		} else {
4601
    			mean_rec_length = (ulong) (data_file_length / records);
4602 4603 4604 4605 4606 4607 4608 4609 4610
    		}
    	}

	if (flag & HA_STATUS_CONST) {
		index = dict_table_get_first_index_noninline(ib_table);

		if (prebuilt->clust_index_was_generated) {
			index = dict_table_get_next_index_noninline(index);
		}
4611

4612
		for (i = 0; i < table->s->keys; i++) {
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4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623
			if (index == NULL) {
				ut_print_timestamp(stderr);
			        fprintf(stderr,
"  InnoDB: Error: table %s contains less indexes inside InnoDB\n"
"InnoDB: than are defined in the MySQL .frm file. Have you mixed up\n"
"InnoDB: .frm files from different installations? See section\n"
"InnoDB: 15.1 at http://www.innodb.com/ibman.html\n",
				   ib_table->name);
				break;
			}

4624 4625
			for (j = 0; j < table->key_info[i].key_parts; j++) {

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4626 4627 4628 4629 4630 4631 4632 4633
				if (j + 1 > index->n_uniq) {
				        ut_print_timestamp(stderr);
			                fprintf(stderr,
"  InnoDB: Error: index %s of %s has %lu columns unique inside InnoDB\n"
"InnoDB: but MySQL is asking statistics for %lu columns. Have you mixed up\n"
"InnoDB: .frm files from different installations? See section\n"
"InnoDB: 15.1 at http://www.innodb.com/ibman.html\n",
						index->name,
4634 4635
						ib_table->name,
						(unsigned long) index->n_uniq,
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4636 4637 4638 4639
						j + 1);
				        break;
				}

4640 4641 4642 4643
				if (index->stat_n_diff_key_vals[j + 1] == 0) {

					rec_per_key = records;
				} else {
4644
					rec_per_key = (ha_rows)(records /
4645 4646 4647
   				         index->stat_n_diff_key_vals[j + 1]);
				}

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				/* Since MySQL seems to favor table scans
				too much over index searches, we pretend
				index selectivity is 2 times better than
				our estimate: */

				rec_per_key = rec_per_key / 2;

4655 4656 4657
				if (rec_per_key == 0) {
					rec_per_key = 1;
				}
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4659 4660 4661
 				table->key_info[i].rec_per_key[j]=
				  rec_per_key >= ~(ulong) 0 ? ~(ulong) 0 :
				  rec_per_key;
4662
			}
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4663

4664
			index = dict_table_get_next_index_noninline(index);
4665 4666
		}
	}
4667 4668

  	if (flag & HA_STATUS_ERRKEY) {
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4669 4670
		ut_a(prebuilt->trx && prebuilt->trx->magic_n == TRX_MAGIC_N);

4671
		errkey = (unsigned int) row_get_mysql_key_number_for_index(
4672 4673
				       (dict_index_t*)
				       trx_get_error_info(prebuilt->trx));
4674 4675
  	}

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	prebuilt->trx->op_info = (char*)"";

4678 4679 4680
  	DBUG_VOID_RETURN;
}

4681
/**************************************************************************
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4682 4683
Updates index cardinalities of the table, based on 8 random dives into
each index tree. This does NOT calculate exact statistics on the table. */
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int
ha_innobase::analyze(
/*=================*/			 
					/* out: returns always 0 (success) */
	THD*		thd,		/* in: connection thread handle */
	HA_CHECK_OPT*	check_opt)	/* in: currently ignored */
{
	/* Simply call ::info() with all the flags */
	info(HA_STATUS_TIME | HA_STATUS_CONST | HA_STATUS_VARIABLE);

	return(0);
}

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4698
/**************************************************************************
4699 4700
This is mapped to "ALTER TABLE tablename TYPE=InnoDB", which rebuilds
the table in MySQL. */
4701

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int
ha_innobase::optimize(
/*==================*/
	THD*		thd,		/* in: connection thread handle */
	HA_CHECK_OPT*	check_opt)	/* in: currently ignored */
4707
{
4708
        return(HA_ADMIN_TRY_ALTER);
4709 4710
}

4711 4712 4713 4714 4715 4716 4717 4718 4719 4720 4721 4722 4723 4724 4725 4726
/***********************************************************************
Tries to check that an InnoDB table is not corrupted. If corruption is
noticed, prints to stderr information about it. In case of corruption
may also assert a failure and crash the server. */

int
ha_innobase::check(
/*===============*/
					/* out: HA_ADMIN_CORRUPT or
					HA_ADMIN_OK */
	THD* 		thd,		/* in: user thread handle */
	HA_CHECK_OPT* 	check_opt)	/* in: check options, currently
					ignored */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	ulint		ret;
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4727

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4728
	ut_a(prebuilt->trx && prebuilt->trx->magic_n == TRX_MAGIC_N);
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4729 4730
	ut_a(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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4732 4733 4734 4735 4736 4737 4738 4739 4740 4741 4742 4743
	if (prebuilt->mysql_template == NULL) {
		/* Build the template; we will use a dummy template
		in index scans done in checking */

		build_template(prebuilt, NULL, table, ROW_MYSQL_WHOLE_ROW);
	}

	ret = row_check_table_for_mysql(prebuilt);

	if (ret == DB_SUCCESS) {
		return(HA_ADMIN_OK);
	}
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4744

4745 4746 4747
  	return(HA_ADMIN_CORRUPT); 
}

4748
/*****************************************************************
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Merge  
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4749 4750 4751
Adds information about free space in the InnoDB tablespace to a table comment
which is printed out when a user calls SHOW TABLE STATUS. Adds also info on
foreign keys. */
4752 4753 4754 4755

char*
ha_innobase::update_table_comment(
/*==============================*/
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4756 4757 4758
				/* out: table comment + InnoDB free space +
				info on foreign keys */
        const char*	comment)/* in: table comment defined by user */
4759
{
4760 4761 4762
	uint	length			= strlen(comment);
	char*				str;
	row_prebuilt_t*	prebuilt	= (row_prebuilt_t*)innobase_prebuilt;
4763

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4764 4765 4766 4767
	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

4768 4769 4770 4771
	if(length > 64000 - 3) {
		return((char*)comment); /* string too long */
	}

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	update_thd(current_thd);

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	prebuilt->trx->op_info = (char*)"returning table comment";

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	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(prebuilt->trx);
4780
	str = NULL;
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	if (FILE* file = os_file_create_tmpfile()) {
4783
		long	flen;
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		/* output the data to a temporary file */
		fprintf(file, "InnoDB free: %lu kB",
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      		   (ulong) fsp_get_available_space_in_free_extents(
      					prebuilt->table->space));
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		dict_print_info_on_foreign_keys(FALSE, file,
				prebuilt->trx, prebuilt->table);
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		flen = ftell(file);
		if(length + flen + 3 > 64000) {
			flen = 64000 - 3 - length;
		}
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		ut_ad(flen > 0);
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		/* allocate buffer for the full string, and
		read the contents of the temporary file */
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		str = my_malloc(length + flen + 3, MYF(0));
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		if (str) {
			char* pos	= str + length;
			if(length) {
				memcpy(str, comment, length);
				*pos++ = ';';
				*pos++ = ' ';
			}
			rewind(file);
			flen = fread(pos, 1, flen, file);
			pos[flen] = 0;
		}

		fclose(file);
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	}
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        prebuilt->trx->op_info = (char*)"";

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  	return(str ? str : (char*) comment);
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}

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/***********************************************************************
Gets the foreign key create info for a table stored in InnoDB. */

char*
ha_innobase::get_foreign_key_create_info(void)
/*==========================================*/
			/* out, own: character string in the form which
			can be inserted to the CREATE TABLE statement,
			MUST be freed with ::free_foreign_key_create_info */
{
	row_prebuilt_t* prebuilt = (row_prebuilt_t*)innobase_prebuilt;
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	char*	str	= 0;
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	ut_a(prebuilt != NULL);
4838

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	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

	update_thd(current_thd);

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	if (FILE* file = os_file_create_tmpfile()) {
4846
		long	flen;
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		prebuilt->trx->op_info = (char*)"getting info on foreign keys";
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		/* In case MySQL calls this in the middle of a SELECT query,
		release possible adaptive hash latch to avoid
		deadlocks of threads */
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		trx_search_latch_release_if_reserved(prebuilt->trx);
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		/* output the data to a temporary file */
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		dict_print_info_on_foreign_keys(TRUE, file,
				prebuilt->trx, prebuilt->table);
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		prebuilt->trx->op_info = (char*)"";

		flen = ftell(file);
		if(flen > 64000 - 1) {
			flen = 64000 - 1;
		}

		ut_ad(flen >= 0);

		/* allocate buffer for the string, and
		read the contents of the temporary file */

		str = my_malloc(flen + 1, MYF(0));

		if (str) {
			rewind(file);
			flen = fread(str, 1, flen, file);
			str[flen] = 0;
		}

		fclose(file);
	} else {
		/* unable to create temporary file */
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          	str = my_malloc(1, MYF(MY_ZEROFILL));
4883
	}
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  	return(str);
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}
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int 
ha_innobase::get_foreign_key_list(THD *thd, List<FOREIGN_KEY_INFO> *f_key_list)
{
  dict_foreign_t* foreign;

  DBUG_ENTER("get_foreign_key_list");
  row_prebuilt_t* prebuilt = (row_prebuilt_t*)innobase_prebuilt;
  ut_a(prebuilt != NULL);
  update_thd(current_thd);
  prebuilt->trx->op_info = (char*)"getting list of foreign keys";
  trx_search_latch_release_if_reserved(prebuilt->trx);
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  mutex_enter_noninline(&(dict_sys->mutex));
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  foreign = UT_LIST_GET_FIRST(prebuilt->table->foreign_list);

  while (foreign != NULL) 
  {
    uint i;
    FOREIGN_KEY_INFO f_key_info;
    LEX_STRING *name= 0;
    const char *tmp_buff;

    tmp_buff= foreign->id;
    i= 0;
    while (tmp_buff[i] != '/')
      i++;
    tmp_buff+= i + 1;
    f_key_info.forein_id= make_lex_string(thd, f_key_info.forein_id,
                                          tmp_buff, strlen(tmp_buff), 1);
    tmp_buff= foreign->referenced_table_name;
    i= 0;
    while (tmp_buff[i] != '/')
      i++;
    f_key_info.referenced_db= make_lex_string(thd, f_key_info.referenced_db,
                                              tmp_buff, i, 1);
    tmp_buff+= i + 1;
    f_key_info.referenced_table= make_lex_string(thd, 
                                                 f_key_info.referenced_table,
                                                 tmp_buff, strlen(tmp_buff), 1);

    for (i= 0;;)
    {
      tmp_buff= foreign->foreign_col_names[i];
      name= make_lex_string(thd, name, tmp_buff, strlen(tmp_buff), 1);
      f_key_info.foreign_fields.push_back(name);
      tmp_buff= foreign->referenced_col_names[i];
      name= make_lex_string(thd, name, tmp_buff, strlen(tmp_buff), 1);
      f_key_info.referenced_fields.push_back(name);
      if (++i >= foreign->n_fields)
        break;
    }

    ulong length= 0;
    if (foreign->type == DICT_FOREIGN_ON_DELETE_CASCADE)
    {
      length=17;
      tmp_buff= "ON DELETE CASCADE";
    }	
    else if (foreign->type == DICT_FOREIGN_ON_DELETE_SET_NULL)
    {
      length=18;
      tmp_buff= "ON DELETE SET NULL";
    }
    else if (foreign->type == DICT_FOREIGN_ON_DELETE_NO_ACTION)
    {
      length=19;
      tmp_buff= "ON DELETE NO ACTION";
    }
    else if (foreign->type == DICT_FOREIGN_ON_UPDATE_CASCADE)
    {
      length=17;
      tmp_buff= "ON UPDATE CASCADE";
    }
    else if (foreign->type == DICT_FOREIGN_ON_UPDATE_SET_NULL)
    {
      length=18;
      tmp_buff= "ON UPDATE SET NULL";
    }
    else if (foreign->type == DICT_FOREIGN_ON_UPDATE_NO_ACTION)
    {
      length=19;
      tmp_buff= "ON UPDATE NO ACTION";
    }
    f_key_info.constraint_method= make_lex_string(thd,
                                                  f_key_info.constraint_method,
                                                  tmp_buff, length, 1);

    FOREIGN_KEY_INFO *pf_key_info= ((FOREIGN_KEY_INFO *) 
                                    thd->memdup((gptr) &f_key_info,
                                                sizeof(FOREIGN_KEY_INFO)));
    f_key_list->push_back(pf_key_info);
    foreign = UT_LIST_GET_NEXT(foreign_list, foreign);
  }
4981
  mutex_exit_noninline(&(dict_sys->mutex));
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  prebuilt->trx->op_info = (char*)"";
  DBUG_RETURN(0);
}

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/***********************************************************************
Checks if a table is referenced by a foreign key. The MySQL manual states that
a REPLACE is either equivalent to an INSERT, or DELETE(s) + INSERT. Only a
delete is then allowed internally to resolve a duplicate key conflict in
REPLACE, not an update. */

uint
ha_innobase::referenced_by_foreign_key(void)
/*========================================*/
			/* out: > 0 if referenced by a FOREIGN KEY */
{
	row_prebuilt_t* prebuilt = (row_prebuilt_t*)innobase_prebuilt;

	if (dict_table_referenced_by_foreign_key(prebuilt->table)) {

		return(1);
	}

	return(0);
}
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/***********************************************************************
Frees the foreign key create info for a table stored in InnoDB, if it is
non-NULL. */

void
ha_innobase::free_foreign_key_create_info(
/*======================================*/
	char*	str)	/* in, own: create info string to free  */
{
	if (str) {
5017
		my_free(str, MYF(0));
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	}
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}

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/***********************************************************************
Tells something additional to the handler about how to do things. */

int
ha_innobase::extra(
/*===============*/
			   /* out: 0 or error number */
	enum ha_extra_function operation)
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                           /* in: HA_EXTRA_RETRIEVE_ALL_COLS or some
			   other flag */
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{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;

	/* Warning: since it is not sure that MySQL calls external_lock
	before calling this function, the trx field in prebuilt can be
	obsolete! */

	switch (operation) {
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                case HA_EXTRA_FLUSH:
                        if (prebuilt->blob_heap) {
                                row_mysql_prebuilt_free_blob_heap(prebuilt);
                        }
                        break;
                case HA_EXTRA_RESET:
                        if (prebuilt->blob_heap) {
                                row_mysql_prebuilt_free_blob_heap(prebuilt);
                        }
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                        prebuilt->keep_other_fields_on_keyread = 0;
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                        prebuilt->read_just_key = 0;
                        break;
  		case HA_EXTRA_RESET_STATE:
5052
	        	prebuilt->keep_other_fields_on_keyread = 0;
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	        	prebuilt->read_just_key = 0;
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    	        	break;
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		case HA_EXTRA_NO_KEYREAD:
    			prebuilt->read_just_key = 0;
    			break;
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	        case HA_EXTRA_RETRIEVE_ALL_COLS:
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			prebuilt->hint_need_to_fetch_extra_cols
					= ROW_RETRIEVE_ALL_COLS;
			break;
	        case HA_EXTRA_RETRIEVE_PRIMARY_KEY:
			if (prebuilt->hint_need_to_fetch_extra_cols == 0) {
				prebuilt->hint_need_to_fetch_extra_cols
					= ROW_RETRIEVE_PRIMARY_KEY;
			}
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			break;
	        case HA_EXTRA_KEYREAD:
	        	prebuilt->read_just_key = 1;
	        	break;
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		case HA_EXTRA_KEYREAD_PRESERVE_FIELDS:
			prebuilt->keep_other_fields_on_keyread = 1;
			break;
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		default:/* Do nothing */
			;
	}

	return(0);
}

5081
/**********************************************************************
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MySQL calls this function at the start of each SQL statement inside LOCK
TABLES. Inside LOCK TABLES the ::external_lock method does not work to
mark SQL statement borders. Note also a special case: if a temporary table
is created inside LOCK TABLES, MySQL has not called external_lock() at all
on that table. */
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int
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ha_innobase::start_stmt(
/*====================*/
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	              /* out: 0 or error code */
	THD*    thd)  /* in: handle to the user thread */
{
	row_prebuilt_t* prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	trx_t*		trx;

	update_thd(thd);

	trx = prebuilt->trx;

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	/* Here we release the search latch and the InnoDB thread FIFO ticket
	if they were reserved. They should have been released already at the
	end of the previous statement, but because inside LOCK TABLES the
	lock count method does not work to mark the end of a SELECT statement,
	that may not be the case. We MUST release the search latch before an
	INSERT, for example. */

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	innobase_release_stat_resources(trx);

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	if (trx->isolation_level <= TRX_ISO_READ_COMMITTED
	    						&& trx->read_view) {
	    	/* At low transaction isolation levels we let
		each consistent read set its own snapshot */

	    	read_view_close_for_mysql(trx);
	}

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	auto_inc_counter_for_this_stat = 0;
	prebuilt->sql_stat_start = TRUE;
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	prebuilt->hint_need_to_fetch_extra_cols = 0;
5121
	prebuilt->read_just_key = 0;
5122
        prebuilt->keep_other_fields_on_keyread = FALSE;
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	if (!prebuilt->mysql_has_locked) {
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	        /* This handle is for a temporary table created inside
	        this same LOCK TABLES; since MySQL does NOT call external_lock
	        in this case, we must use x-row locks inside InnoDB to be
	        prepared for an update of a row */
	  
	        prebuilt->select_lock_type = LOCK_X;
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	} else {
		if (trx->isolation_level != TRX_ISO_SERIALIZABLE
		    && thd->lex->sql_command == SQLCOM_SELECT
		    && thd->lex->lock_option == TL_READ) {
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			/* For other than temporary tables, we obtain
			no lock for consistent read (plain SELECT). */

			prebuilt->select_lock_type = LOCK_NONE;
		} else {
			/* Not a consistent read: restore the
			select_lock_type value. The value of
			stored_select_lock_type was decided in:
			1) ::store_lock(),
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			2) ::external_lock(), 
			3) ::init_table_handle_for_HANDLER(), and 
			4) :.transactional_table_lock(). */
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			prebuilt->select_lock_type =
				prebuilt->stored_select_lock_type;
		}

		if (prebuilt->stored_select_lock_type != LOCK_S
		    && prebuilt->stored_select_lock_type != LOCK_X) {
			fprintf(stderr,
"InnoDB: Error: stored_select_lock_type is %lu inside ::start_stmt()!\n",
			prebuilt->stored_select_lock_type);

			/* Set the value to LOCK_X: this is just fault
			tolerance, we do not know what the correct value
			should be! */

			prebuilt->select_lock_type = LOCK_X;
		}
	}

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	/* Set the MySQL flag to mark that there is an active transaction */
5168
	thd->transaction.all.innodb_active_trans = 1;
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	return(0);
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}

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/**********************************************************************
Maps a MySQL trx isolation level code to the InnoDB isolation level code */
inline
ulint
innobase_map_isolation_level(
/*=========================*/
					/* out: InnoDB isolation level */
	enum_tx_isolation	iso)	/* in: MySQL isolation level code */
{
	switch(iso) {
		case ISO_REPEATABLE_READ: return(TRX_ISO_REPEATABLE_READ);
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		case ISO_READ_COMMITTED: return(TRX_ISO_READ_COMMITTED);
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		case ISO_SERIALIZABLE: return(TRX_ISO_SERIALIZABLE);
		case ISO_READ_UNCOMMITTED: return(TRX_ISO_READ_UNCOMMITTED);
		default: ut_a(0); return(0);
	}	
}
	
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/**********************************************************************
As MySQL will execute an external lock for every new table it uses when it
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starts to process an SQL statement (an exception is when MySQL calls
start_stmt for the handle) we can use this function to store the pointer to
the THD in the handle. We will also use this function to communicate
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to InnoDB that a new SQL statement has started and that we must store a
savepoint to our transaction handle, so that we are able to roll back
the SQL statement in case of an error. */

int
ha_innobase::external_lock(
/*=======================*/
5203
			        /* out: 0 */
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	THD*	thd,		/* in: handle to the user thread */
	int 	lock_type)	/* in: lock type */
{
	row_prebuilt_t* prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	trx_t*		trx;

  	DBUG_ENTER("ha_innobase::external_lock");
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	DBUG_PRINT("enter",("lock_type: %d", lock_type));
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	update_thd(thd);

	trx = prebuilt->trx;

	prebuilt->sql_stat_start = TRUE;
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	prebuilt->hint_need_to_fetch_extra_cols = 0;
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	prebuilt->read_just_key = 0;
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	prebuilt->keep_other_fields_on_keyread = FALSE;
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	if (lock_type == F_WRLCK) {

		/* If this is a SELECT, then it is in UPDATE TABLE ...
		or SELECT ... FOR UPDATE */
		prebuilt->select_lock_type = LOCK_X;
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		prebuilt->stored_select_lock_type = LOCK_X;
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	}

	if (lock_type != F_UNLCK) {
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		/* MySQL is setting a new table lock */
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		/* Set the MySQL flag to mark that there is an active
		transaction */
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		thd->transaction.all.innodb_active_trans = 1;
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		trx->n_mysql_tables_in_use++;
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		prebuilt->mysql_has_locked = TRUE;
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		if (trx->n_mysql_tables_in_use == 1) {
		        trx->isolation_level = innobase_map_isolation_level(
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						(enum_tx_isolation)
						thd->variables.tx_isolation);
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		}
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		if (trx->isolation_level == TRX_ISO_SERIALIZABLE
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		    && prebuilt->select_lock_type == LOCK_NONE
		    && (thd->options
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				& (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {
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			/* To get serializable execution, we let InnoDB
			conceptually add 'LOCK IN SHARE MODE' to all SELECTs
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			which otherwise would have been consistent reads. An
			exception is consistent reads in the AUTOCOMMIT=1 mode:
			we know that they are read-only transactions, and they
			can be serialized also if performed as consistent
			reads. */
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			prebuilt->select_lock_type = LOCK_S;
		}

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		/* Starting from 4.1.9, no InnoDB table lock is taken in LOCK
		TABLES if AUTOCOMMIT=1. It does not make much sense to acquire
		an InnoDB table lock if it is released immediately at the end
		of LOCK TABLES, and InnoDB's table locks in that case cause
		VERY easily deadlocks. */

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		if (prebuilt->select_lock_type != LOCK_NONE) {
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5271
			if (thd->in_lock_tables &&
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			    thd->variables.innodb_table_locks &&
			    (thd->options & OPTION_NOT_AUTOCOMMIT)) {
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5275
				ulint	error;
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				error = row_lock_table_for_mysql(prebuilt,
							NULL, LOCK_TABLE_EXP);
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				if (error != DB_SUCCESS) {
					error = convert_error_code_to_mysql(
						error, user_thd);
					DBUG_RETURN(error);
				}
			}
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		  	trx->mysql_n_tables_locked++;
		}

5289
		DBUG_RETURN(0);
5290
	}
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5292
	/* MySQL is releasing a table lock */
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	trx->n_mysql_tables_in_use--;
	prebuilt->mysql_has_locked = FALSE;
	auto_inc_counter_for_this_stat = 0;
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	if (trx->n_lock_table_exp) {
		row_unlock_tables_for_mysql(trx);
5299
	}
5300

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	/* If the MySQL lock count drops to zero we know that the current SQL
	statement has ended */
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	if (trx->n_mysql_tables_in_use == 0) {
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	        trx->mysql_n_tables_locked = 0;
		prebuilt->used_in_HANDLER = FALSE;
			
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		/* Release a possible FIFO ticket and search latch. Since we
		may reserve the kernel mutex, we have to release the search
		system latch first to obey the latching order. */

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		innobase_release_stat_resources(trx);
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		if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {
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			if (thd->transaction.all.innodb_active_trans != 0) {
		    	        innobase_commit(thd, trx);
			}
		} else {
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			if (trx->isolation_level <= TRX_ISO_READ_COMMITTED
	    						&& trx->read_view) {

5323
				/* At low transaction isolation levels we let
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				each consistent read set its own snapshot */

5326
				read_view_close_for_mysql(trx);
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			}
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		}
	}

5331
	DBUG_RETURN(0);
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}

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/**********************************************************************
With this function MySQL request a transactional lock to a table when
user issued query LOCK TABLES..WHERE ENGINE = InnoDB. */

int
ha_innobase::transactional_table_lock(
/*==================================*/
			        /* out: 0 */
	THD*	thd,		/* in: handle to the user thread */
	int 	lock_type)	/* in: lock type */
{
	row_prebuilt_t* prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	trx_t*		trx;

  	DBUG_ENTER("ha_innobase::transactional_table_lock");
	DBUG_PRINT("enter",("lock_type: %d", lock_type));

	/* We do not know if MySQL can call this function before calling
	external_lock(). To be safe, update the thd of the current table
	handle. */

	update_thd(thd);

 	if (prebuilt->table->ibd_file_missing && !current_thd->tablespace_op) {
	        ut_print_timestamp(stderr);
	        fprintf(stderr, "  InnoDB error:\n"
"MySQL is trying to use a table handle but the .ibd file for\n"
"table %s does not exist.\n"
"Have you deleted the .ibd file from the database directory under\n"
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"the MySQL datadir?"
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"Look from section 15.1 of http://www.innodb.com/ibman.html\n"
"how you can resolve the problem.\n",
				prebuilt->table->name);
		DBUG_RETURN(HA_ERR_CRASHED);
	}

	trx = prebuilt->trx;

	prebuilt->sql_stat_start = TRUE;
	prebuilt->hint_need_to_fetch_extra_cols = 0;

	prebuilt->read_just_key = 0;
	prebuilt->keep_other_fields_on_keyread = FALSE;

	if (lock_type == F_WRLCK) {
		prebuilt->select_lock_type = LOCK_X;
		prebuilt->stored_select_lock_type = LOCK_X;
	} else if (lock_type == F_RDLCK) {
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		prebuilt->select_lock_type = LOCK_S;
		prebuilt->stored_select_lock_type = LOCK_S;
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	} else {
	        ut_print_timestamp(stderr);
	        fprintf(stderr, "  InnoDB error:\n"
"MySQL is trying to set transactional table lock with corrupted lock type\n"
"to table %s, lock type %d does not exist.\n",
				prebuilt->table->name, lock_type);
		DBUG_RETURN(HA_ERR_CRASHED);
	}

	/* MySQL is setting a new transactional table lock */

	/* Set the MySQL flag to mark that there is an active transaction */
	thd->transaction.all.innodb_active_trans = 1;

	if (thd->in_lock_tables && thd->variables.innodb_table_locks) {
		ulint	error = DB_SUCCESS;

		error = row_lock_table_for_mysql(prebuilt,NULL, 
						LOCK_TABLE_TRANSACTIONAL);

		if (error != DB_SUCCESS) {
			error = convert_error_code_to_mysql(error, user_thd);
			DBUG_RETURN(error);
		}

		if (thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) {

			/* Store the current undo_no of the transaction 
			so that we know where to roll back if we have 
			to roll back the next SQL statement */

			trx_mark_sql_stat_end(trx);
		}
	}

	DBUG_RETURN(0);
}

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/****************************************************************************
Here we export InnoDB status variables to MySQL.  */

void
innodb_export_status(void)
/*======================*/
{
  srv_export_innodb_status();
}


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/****************************************************************************
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5434
Implements the SHOW INNODB STATUS command. Sends the output of the InnoDB
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Monitor to the client. */

5437
bool
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innodb_show_status(
/*===============*/
	THD*	thd)	/* in: the MySQL query thread of the caller */
{
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        Protocol        *protocol= thd->protocol;
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	trx_t*		trx;
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        DBUG_ENTER("innodb_show_status");

5447
        if (have_innodb != SHOW_OPTION_YES) {
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                my_message(ER_NOT_SUPPORTED_YET,
          "Cannot call SHOW INNODB STATUS because skip-innodb is defined",
                           MYF(0));
5451
                DBUG_RETURN(TRUE);
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        }
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	trx = check_trx_exists(thd);

	innobase_release_stat_resources(trx);

5458
	/* We let the InnoDB Monitor to output at most 64000 bytes of text. */
5459

5460 5461
	long	flen;
	char*	str;
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5462

5463
	mutex_enter_noninline(&srv_monitor_file_mutex);
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	rewind(srv_monitor_file);
	srv_printf_innodb_monitor(srv_monitor_file);
	flen = ftell(srv_monitor_file);
5467
	os_file_set_eof(srv_monitor_file);
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	if(flen > 64000 - 1) {
		flen = 64000 - 1;
	}
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5472
	ut_ad(flen > 0);
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	/* allocate buffer for the string, and
	read the contents of the temporary file */
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	if (!(str = my_malloc(flen + 1, MYF(0))))
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5478
        {
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          mutex_exit_noninline(&srv_monitor_file_mutex);
5480
          DBUG_RETURN(TRUE);
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        }
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	rewind(srv_monitor_file);
	flen = fread(str, 1, flen, srv_monitor_file);
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5486
	mutex_exit_noninline(&srv_monitor_file_mutex);
5487

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	List<Item> field_list;

5490
	field_list.push_back(new Item_empty_string("Status", flen));
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	if (protocol->send_fields(&field_list, Protocol::SEND_NUM_ROWS |
                                               Protocol::SEND_EOF)) {
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		my_free(str, MYF(0));
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		DBUG_RETURN(TRUE);
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	}

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        protocol->prepare_for_resend();
        protocol->store(str, flen, system_charset_info);
        my_free(str, MYF(0));
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        if (protocol->write())
5505
          DBUG_RETURN(TRUE);
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	send_eof(thd);
5508
  	DBUG_RETURN(FALSE);
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}

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/****************************************************************************
Implements the SHOW MUTEX STATUS command. . */

bool
innodb_mutex_show_status(
/*===============*/
  THD*  thd)  /* in: the MySQL query thread of the caller */
{
  Protocol        *protocol= thd->protocol;
  List<Item> field_list;
  mutex_t*  mutex;
  const char* file_name;
  ulint   line;
  ulint   rw_lock_count= 0;
  ulint   rw_lock_count_spin_loop= 0;
  ulint   rw_lock_count_spin_rounds= 0;
  ulint   rw_lock_count_os_wait= 0;
  ulint   rw_lock_count_os_yield= 0;
  ulonglong rw_lock_wait_time= 0;

  DBUG_ENTER("innodb_mutex_show_status");

  field_list.push_back(new Item_empty_string("Mutex", FN_REFLEN));
  field_list.push_back(new Item_empty_string("Module", FN_REFLEN));
  field_list.push_back(new Item_uint("Count", 21));
  field_list.push_back(new Item_uint("Spin_waits", 21));
  field_list.push_back(new Item_uint("Spin_rounds", 21));
  field_list.push_back(new Item_uint("OS_waits", 21));
  field_list.push_back(new Item_uint("OS_yields", 21));
  field_list.push_back(new Item_uint("OS_waits_time", 21));

  if (protocol->send_fields(&field_list,
                            Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF))
    DBUG_RETURN(TRUE);

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#ifdef MUTEX_PROTECT_TO_BE_ADDED_LATER
    mutex_enter(&mutex_list_mutex);
#endif
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  mutex = UT_LIST_GET_FIRST(mutex_list);

  while ( mutex != NULL )
  {
    if (mutex->mutex_type != 1)
    {
      if (mutex->count_using > 0)
      {
        protocol->prepare_for_resend();
        protocol->store(mutex->cmutex_name, system_charset_info);
        protocol->store(mutex->cfile_name, system_charset_info);
        protocol->store((ulonglong)mutex->count_using);
        protocol->store((ulonglong)mutex->count_spin_loop);
        protocol->store((ulonglong)mutex->count_spin_rounds);
        protocol->store((ulonglong)mutex->count_os_wait);
        protocol->store((ulonglong)mutex->count_os_yield);
        protocol->store((ulonglong)mutex->lspent_time/1000);

        if (protocol->write())
        {
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#ifdef MUTEX_PROTECT_TO_BE_ADDED_LATER
          mutex_exit(&mutex_list_mutex);
#endif
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          DBUG_RETURN(1);
        }
      }
    }
    else
    {
      rw_lock_count += mutex->count_using;
      rw_lock_count_spin_loop += mutex->count_spin_loop;
      rw_lock_count_spin_rounds += mutex->count_spin_rounds;
      rw_lock_count_os_wait += mutex->count_os_wait;
      rw_lock_count_os_yield += mutex->count_os_yield;
      rw_lock_wait_time += mutex->lspent_time;
    }

    mutex = UT_LIST_GET_NEXT(list, mutex);
  }

  protocol->prepare_for_resend();
  protocol->store("rw_lock_mutexes", system_charset_info);
  protocol->store("", system_charset_info);
  protocol->store((ulonglong)rw_lock_count);
  protocol->store((ulonglong)rw_lock_count_spin_loop);
  protocol->store((ulonglong)rw_lock_count_spin_rounds);
  protocol->store((ulonglong)rw_lock_count_os_wait);
  protocol->store((ulonglong)rw_lock_count_os_yield);
  protocol->store((ulonglong)rw_lock_wait_time/1000);

  if (protocol->write())
  {
    DBUG_RETURN(1);
  }

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#ifdef MUTEX_PROTECT_TO_BE_ADDED_LATER
      mutex_exit(&mutex_list_mutex);
#endif
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  send_eof(thd);
  DBUG_RETURN(FALSE);
}

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/****************************************************************************
 Handling the shared INNOBASE_SHARE structure that is needed to provide table
 locking.
****************************************************************************/

5617
static mysql_byte* innobase_get_key(INNOBASE_SHARE *share,uint *length,
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			      my_bool not_used __attribute__((unused)))
{
  *length=share->table_name_length;
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  return (mysql_byte*) share->table_name;
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}

static INNOBASE_SHARE *get_share(const char *table_name)
{
  INNOBASE_SHARE *share;
  pthread_mutex_lock(&innobase_mutex);
  uint length=(uint) strlen(table_name);
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  if (!(share=(INNOBASE_SHARE*) hash_search(&innobase_open_tables,
5630
					(mysql_byte*) table_name,
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					    length)))
  {
    if ((share=(INNOBASE_SHARE *) my_malloc(sizeof(*share)+length+1,
				       MYF(MY_WME | MY_ZEROFILL))))
    {
      share->table_name_length=length;
      share->table_name=(char*) (share+1);
      strmov(share->table_name,table_name);
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      if (my_hash_insert(&innobase_open_tables, (mysql_byte*) share))
5640 5641 5642 5643 5644 5645
      {
	pthread_mutex_unlock(&innobase_mutex);
	my_free((gptr) share,0);
	return 0;
      }
      thr_lock_init(&share->lock);
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      pthread_mutex_init(&share->mutex,MY_MUTEX_INIT_FAST);
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    }
  }
  share->use_count++;
  pthread_mutex_unlock(&innobase_mutex);
  return share;
}

static void free_share(INNOBASE_SHARE *share)
{
  pthread_mutex_lock(&innobase_mutex);
  if (!--share->use_count)
  {
5659
    hash_delete(&innobase_open_tables, (mysql_byte*) share);
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    thr_lock_delete(&share->lock);
    pthread_mutex_destroy(&share->mutex);
    my_free((gptr) share, MYF(0));
  }
  pthread_mutex_unlock(&innobase_mutex);
}
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/*********************************************************************
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Converts a MySQL table lock stored in the 'lock' field of the handle to
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a proper type before storing pointer to the lock into an array of pointers.
MySQL also calls this if it wants to reset some table locks to a not-locked
state during the processing of an SQL query. An example is that during a
SELECT the read lock is released early on the 'const' tables where we only
fetch one row. MySQL does not call this when it releases all locks at the
end of an SQL statement. */
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THR_LOCK_DATA**
ha_innobase::store_lock(
/*====================*/
						/* out: pointer to the next
						element in the 'to' array */
	THD*			thd,		/* in: user thread handle */
	THR_LOCK_DATA**		to,		/* in: pointer to an array
						of pointers to lock structs;
						pointer to the 'lock' field
						of current handle is stored
						next to this array */
	enum thr_lock_type 	lock_type)	/* in: lock type to store in
						'lock' */
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;

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	if ((lock_type == TL_READ && thd->in_lock_tables) ||
	    (lock_type == TL_READ_HIGH_PRIORITY && thd->in_lock_tables) ||
	    lock_type == TL_READ_WITH_SHARED_LOCKS ||
5695
	    lock_type == TL_READ_NO_INSERT) {
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		/* The OR cases above are in this order:
		1) MySQL is doing LOCK TABLES ... READ LOCAL, or
		2) (we do not know when TL_READ_HIGH_PRIORITY is used), or
		3) this is a SELECT ... IN SHARE MODE, or
		4) we are doing a complex SQL statement like
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		INSERT INTO ... SELECT ... and the logical logging (MySQL
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		binlog) requires the use of a locking read, or
		MySQL is doing LOCK TABLES ... READ. */
5704

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		prebuilt->select_lock_type = LOCK_S;
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		prebuilt->stored_select_lock_type = LOCK_S;

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	} else if (lock_type != TL_IGNORE) {

	        /* In ha_berkeley.cc there is a comment that MySQL
	        may in exceptional cases call this with TL_IGNORE also
	        when it is NOT going to release the lock. */

	        /* We set possible LOCK_X value in external_lock, not yet
5715
		here even if this would be SELECT ... FOR UPDATE */
5716

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		prebuilt->select_lock_type = LOCK_NONE;
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		prebuilt->stored_select_lock_type = LOCK_NONE;
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	}

	if (lock_type != TL_IGNORE && lock.type == TL_UNLOCK) {

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    		/* If we are not doing a LOCK TABLE or DISCARD/IMPORT
		TABLESPACE, then allow multiple writers */
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    		if ((lock_type >= TL_WRITE_CONCURRENT_INSERT &&
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	 	    lock_type <= TL_WRITE) && !thd->in_lock_tables
		    && !thd->tablespace_op) {
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      			lock_type = TL_WRITE_ALLOW_WRITE;
      		}

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		/* In queries of type INSERT INTO t1 SELECT ... FROM t2 ...
		MySQL would use the lock TL_READ_NO_INSERT on t2, and that
		would conflict with TL_WRITE_ALLOW_WRITE, blocking all inserts
		to t2. Convert the lock to a normal read lock to allow
		concurrent inserts to t2. */
      		
		if (lock_type == TL_READ_NO_INSERT && !thd->in_lock_tables) {
			lock_type = TL_READ;
		}
		
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 		lock.type=lock_type;
  	}

  	*to++= &lock;
5747

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	return(to);
}

5751
/***********************************************************************
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This function initializes the auto-inc counter if it has not been
initialized yet. This function does not change the value of the auto-inc
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counter if it already has been initialized. In paramete ret returns
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the value of the auto-inc counter. */
5756

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int
ha_innobase::innobase_read_and_init_auto_inc(
/*=========================================*/
				/* out: 0 or error code: deadlock or
				lock wait timeout */
	longlong*	ret)	/* out: auto-inc value */
5763
{
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  	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
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    	longlong        auto_inc;
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  	int     	error;
5767

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  	ut_a(prebuilt);
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	ut_a(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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	ut_a(prebuilt->table);
	
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	/* In case MySQL calls this in the middle of a SELECT query, release
	possible adaptive hash latch to avoid deadlocks of threads */

	trx_search_latch_release_if_reserved(prebuilt->trx);

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	auto_inc = dict_table_autoinc_read(prebuilt->table);
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	if (auto_inc != 0) {
		/* Already initialized */
		*ret = auto_inc;
	
		return(0);
	}
5786

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	error = row_lock_table_autoinc_for_mysql(prebuilt);
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	if (error != DB_SUCCESS) {
		error = convert_error_code_to_mysql(error, user_thd);
5791

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		goto func_exit;
	}	
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	/* Check again if someone has initialized the counter meanwhile */
	auto_inc = dict_table_autoinc_read(prebuilt->table);
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	if (auto_inc != 0) {
		*ret = auto_inc;
	
		return(0);
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	}
5803

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  	(void) extra(HA_EXTRA_KEYREAD);
5805
  	index_init(table->s->next_number_index);
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	/* We use an exclusive lock when we read the max key value from the
  	auto-increment column index. This is because then build_template will
  	advise InnoDB to fetch all columns. In SHOW TABLE STATUS the query
  	id of the auto-increment column is not changed, and previously InnoDB
  	did not fetch it, causing SHOW TABLE STATUS to show wrong values
  	for the autoinc column. */
5813

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  	prebuilt->select_lock_type = LOCK_X;
5815

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  	/* Play safe and also give in another way the hint to fetch
  	all columns in the key: */
  	
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	prebuilt->hint_need_to_fetch_extra_cols = ROW_RETRIEVE_ALL_COLS;
5820

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	prebuilt->trx->mysql_n_tables_locked += 1;
5822
  
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	error = index_last(table->record[1]);
5824

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  	if (error) {
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		if (error == HA_ERR_END_OF_FILE) {
			/* The table was empty, initialize to 1 */
			auto_inc = 1;

			error = 0;
		} else {
			/* Deadlock or a lock wait timeout */
  			auto_inc = -1;

  			goto func_exit;
  		}
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  	} else {
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		/* Initialize to max(col) + 1 */
    		auto_inc = (longlong) table->next_number_field->
5840
                        	val_int_offset(table->s->rec_buff_length) + 1;
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  	}
5842

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	dict_table_autoinc_initialize(prebuilt->table, auto_inc);

func_exit:
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  	(void) extra(HA_EXTRA_NO_KEYREAD);
5847

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	index_end();

	*ret = auto_inc;

  	return(error);
}

/***********************************************************************
This function initializes the auto-inc counter if it has not been
initialized yet. This function does not change the value of the auto-inc
counter if it already has been initialized. Returns the value of the
auto-inc counter. */

5861
ulonglong
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ha_innobase::get_auto_increment()
/*=============================*/
                         /* out: auto-increment column value, -1 if error
                         (deadlock or lock wait timeout) */
{
  	longlong        nr;
  	int     	error;
	
	error = innobase_read_and_init_auto_inc(&nr);

	if (error) {

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          return(~(ulonglong) 0);
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	}
5876

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	return((ulonglong) nr);
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}

5880
/***********************************************************************
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This function stores the binlog offset and flushes logs. */
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void 
innobase_store_binlog_offset_and_flush_log(
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/*=======================================*/
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    char *binlog_name,          /* in: binlog name */
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    longlong 	offset)		/* in: binlog offset */
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{
	mtr_t mtr;
	
	assert(binlog_name != NULL);

	/* Start a mini-transaction */
        mtr_start_noninline(&mtr); 

	/* Update the latest MySQL binlog name and offset info
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        in trx sys header */
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        trx_sys_update_mysql_binlog_offset(
            binlog_name,
            offset,
            TRX_SYS_MYSQL_LOG_INFO, &mtr);

        /* Commits the mini-transaction */
        mtr_commit(&mtr);
        
	/* Syncronous flush of the log buffer to disk */
	log_buffer_flush_to_disk();
}
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int
ha_innobase::cmp_ref(
	const mysql_byte *ref1,
	const mysql_byte *ref2)
{
	row_prebuilt_t*	 prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	enum_field_types mysql_type;
	Field*		 field;
	int result;

	if (prebuilt->clust_index_was_generated)
		return memcmp(ref1, ref2, DATA_ROW_ID_LEN);

	/* Do type-aware comparison of Primary Key members. PK members
	are always NOT NULL, so no checks for NULL are performed */
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	KEY_PART_INFO *key_part= table->key_info[table->s->primary_key].key_part;
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	KEY_PART_INFO *key_part_end= 
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	  key_part + table->key_info[table->s->primary_key].key_parts;
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	for (; key_part != key_part_end; ++key_part) {
		field = key_part->field;
		mysql_type = field->type();
		if (mysql_type == FIELD_TYPE_TINY_BLOB
		    || mysql_type == FIELD_TYPE_MEDIUM_BLOB
		    || mysql_type == FIELD_TYPE_BLOB
		    || mysql_type == FIELD_TYPE_LONG_BLOB) {
		    
			ut_a(!ref1[1]);
			ut_a(!ref2[1]);
			byte len1= *ref1;
			byte len2= *ref2;
			ref1 += 2;
			ref2 += 2;
			result =
			  ((Field_blob*)field)->cmp((const char*)ref1, len1,
			                            (const char*)ref2, len2);
		} else {
			result = 
			  field->cmp((const char*)ref1, (const char*)ref2);
		}

		if (result)
			return result;
		ref1 += key_part->length;
		ref2 += key_part->length;
	}
	return 0;
}

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char*
ha_innobase::get_mysql_bin_log_name()
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{
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	return(trx_sys_mysql_bin_log_name);
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}

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ulonglong
ha_innobase::get_mysql_bin_log_pos()
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{
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  	/* trx... is ib_longlong, which is a typedef for a 64-bit integer
	(__int64 or longlong) so it's ok to cast it to ulonglong. */

  	return(trx_sys_mysql_bin_log_pos);
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}

5975
extern "C" {
5976
/**********************************************************************
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This function is used to find the storage length in bytes of the first n
characters for prefix indexes using a multibyte character set. The function
finds charset information and returns length of prefix_len characters in the
index field in bytes.

NOTE: the prototype of this function is copied to data0type.c! If you change
this function, you MUST change also data0type.c! */
5984

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ulint
innobase_get_at_most_n_mbchars(
/*===========================*/
				/* out: number of bytes occupied by the first
				n characters */
5990
	ulint charset_id,	/* in: character set id */
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	ulint prefix_len,	/* in: prefix length in bytes of the index
				(this has to be divided by mbmaxlen to get the
				number of CHARACTERS n in the prefix) */
	ulint data_len,         /* in: length of the string in bytes */
	const char* str)	/* in: character string */
5996
{
5997
	ulint char_length;	/* character length in bytes */
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	ulint n_chars;		/* number of characters in prefix */
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	CHARSET_INFO* charset;	/* charset used in the field */
6000

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	charset = get_charset(charset_id, MYF(MY_WME));
6002

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	ut_ad(charset);
	ut_ad(charset->mbmaxlen);
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	/* Calculate how many characters at most the prefix index contains */
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	n_chars = prefix_len / charset->mbmaxlen;
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	/* If the charset is multi-byte, then we must find the length of the
	first at most n chars in the string. If the string contains less
	characters than n, then we return the length to the end of the last
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	character. */
6014

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	if (charset->mbmaxlen > 1) {
		/* my_charpos() returns the byte length of the first n_chars
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		characters, or a value bigger than the length of str, if
		there were not enough full characters in str.

		Why does the code below work:
		Suppose that we are looking for n UTF-8 characters.

		1) If the string is long enough, then the prefix contains at
		least n complete UTF-8 characters + maybe some extra
		characters + an incomplete UTF-8 character. No problem in
		this case. The function returns the pointer to the
		end of the nth character.

		2) If the string is not long enough, then the string contains
		the complete value of a column, that is, only complete UTF-8
		characters, and we can store in the column prefix index the
		whole string. */
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		char_length = my_charpos(charset, str,
						str + data_len, n_chars);
		if (char_length > data_len) {
			char_length = data_len;
		}		
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	} else {
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		if (data_len < prefix_len) {
			char_length = data_len;
		} else {
			char_length = prefix_len;
		}
6045
	}
6046

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	return(char_length);
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}
}

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extern "C" {
/**********************************************************************
This function returns true if SQL-query in the current thread
is either REPLACE or LOAD DATA INFILE REPLACE. 
NOTE that /mysql/innobase/row/row0ins.c must contain the 
prototype for this function ! */

ibool
innobase_query_is_replace(void)
/*===========================*/
{
	THD*	thd;
	
	thd = (THD *)innobase_current_thd();
	
	if ( thd->lex->sql_command == SQLCOM_REPLACE ||
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	     thd->lex->sql_command == SQLCOM_REPLACE_SELECT ||
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	     ( thd->lex->sql_command == SQLCOM_LOAD &&
	       thd->lex->duplicates == DUP_REPLACE )) {
		return true;
	} else {
		return false;
	}
}
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}

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/***********************************************************************
This function is used to prepare X/Open XA distributed transaction   */

int innobase_xa_prepare(
/*====================*/
			/* out: 0 or error number */
	THD*	thd,	/* in: handle to the MySQL thread of the user
			whose XA transaction should be prepared */
	bool	all)	/* in: TRUE - commit transaction
			FALSE - the current SQL statement ended */
{
	int error = 0;
        trx_t* trx;

        trx = check_trx_exists(thd);

	/* TODO: Get X/Open XA Transaction Identification from MySQL*/
	memset(&trx->xid, 0, sizeof(trx->xid));
	trx->xid.formatID = -1;

	/* Release a possible FIFO ticket and search latch. Since we will
	reserve the kernel mutex, we have to release the search system latch
	first to obey the latching order. */

	innobase_release_stat_resources(trx);

	if (trx->active_trans == 0 && trx->conc_state != TRX_NOT_STARTED) {

		fprintf(stderr,
"InnoDB: Error: thd->transaction.all.innodb_active_trans == 0\n"
"InnoDB: but trx->conc_state != TRX_NOT_STARTED\n");
	}

	if (all || (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)))) {
	        
 		/* We were instructed to prepare the whole transaction, or
		this is an SQL statement end and autocommit is on */

		error = trx_prepare_for_mysql(trx);
	} else {
	        /* We just mark the SQL statement ended and do not do a
		transaction prepare */

		if (trx->auto_inc_lock) {
			/* If we had reserved the auto-inc lock for some
			table in this SQL statement we release it now */
		  	
			row_unlock_table_autoinc_for_mysql(trx);
		}
		/* Store the current undo_no of the transaction so that we
		know where to roll back if we have to roll back the next
		SQL statement */

		trx_mark_sql_stat_end(trx);
	}

	/* Tell the InnoDB server that there might be work for utility
	threads: */

	srv_active_wake_master_thread();

        return error;
}

/***********************************************************************
This function is used to recover X/Open XA distributed transactions   */

int innobase_xa_recover(
				/* out: number of prepared transactions 
				stored in xid_list */
	XID*    xid_list, 	/* in/out: prepared transactions */
	uint	len)		/* in: number of slots in xid_list */
/*====================*/
{
	if (len == 0 || xid_list == NULL) {
		return 0;
	}

	return (trx_recover_for_mysql(xid_list, len));
}

/***********************************************************************
This function is used to commit one X/Open XA distributed transaction
which is in the prepared state */

int innobase_commit_by_xid(
/*=======================*/
			/* out: 0 or error number */
	XID*	xid)	/*  in: X/Open XA Transaction Identification */
{
	trx_t*	trx;

	trx = trx_get_trx_by_xid(xid);

	if (trx) {
		innobase_commit_low(trx);
		
		return(XA_OK);
	} else {
		return(XAER_NOTA);
	}
}

/***********************************************************************
This function is used to rollback one X/Open XA distributed transaction
which is in the prepared state */

int innobase_rollback_by_xid(
			/* out: 0 or error number */
	XID	*xid)	/* in : X/Open XA Transaction Idenfification */
{
	trx_t*	trx;

	trx = trx_get_trx_by_xid(xid);

	if (trx) {
		return(innobase_rollback_trx(trx));
	} else {
		return(XAER_NOTA);
	}
}

/***********************************************************************
This function is used to test commit/rollback of XA transactions */

int innobase_xa_end(
/*================*/
	THD*	thd)	/* in: MySQL thread handle of the user for whom
			transactions should be recovered */
{
        DBUG_ENTER("innobase_xa_end");

	XID trx_list[100];
	int trx_num, trx_num_max = 100;
	int i;
	XID xid;

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	while((trx_num = innobase_xa_recover(trx_list, trx_num_max))) {
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		for(i=0;i < trx_num; i++) {
			xid = trx_list[i];

			if ( i % 2) {
				innobase_commit_by_xid(&xid);
			} else {
				innobase_rollback_by_xid(&xid);
			}
		}
	}

	free(trx_list);

	DBUG_RETURN(0);
}
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#endif /* HAVE_INNOBASE_DB */