ha_innodb.cc 171 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},
  {"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
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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_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_thread_concurrency = (ulint) innobase_thread_concurrency;
	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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{
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	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(),
	6. innobase_start_trx_and_assign_read_view()
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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->reclength + table->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->reclength;
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	/* Looks like MySQL-3.23 sometimes has primary key number != 0 */

 	primary_key = table->primary_key;
	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",
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				name, (ulong)key_used_on_scan);
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		}
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	}
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	block_size = 16 * 1024;	/* Index block size in InnoDB: used by MySQL
				in query optimization */

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	/* Init table lock structure */
1884
	thr_lock_data_init(&share->lock,&lock,(void*) 0);
1885 1886

  	info(HA_STATUS_NO_LOCK | HA_STATUS_VARIABLE | HA_STATUS_CONST);
1887

1888 1889 1890 1891
  	DBUG_RETURN(0);
}

/**********************************************************************
1892
Closes a handle to an InnoDB table. */
1893 1894 1895 1896 1897 1898 1899 1900 1901 1902

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

	row_prebuilt_free((row_prebuilt_t*) innobase_prebuilt);

1903
    	my_free((char*) upd_buff, MYF(0));
1904 1905
        free_share(share);

1906
	/* Tell InnoDB server that there might be work for
1907 1908 1909 1910 1911 1912 1913
	utility threads: */

	srv_active_wake_master_thread();

  	DBUG_RETURN(0);
}

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/* 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 */
{
	bzero(record, table->null_bytes);
}

1990 1991
extern "C" {
/*****************************************************************
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1992 1993 1994 1995
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! */
1996 1997 1998

int
innobase_mysql_cmp(
1999
/*===============*/
2000 2001
					/* out: 1, 0, -1, if a is greater,
					equal, less than b, respectively */
2002
	int		mysql_type,	/* in: MySQL type */
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	uint		charset_number,	/* in: number of the charset */
2004 2005 2006 2007 2008 2009 2010
	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;
2012
	enum_field_types	mysql_tp;
2013
	int                     ret;
2014

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2015 2016
	DBUG_ASSERT(a_length != UNIV_SQL_NULL);
	DBUG_ASSERT(b_length != UNIV_SQL_NULL);
2017 2018 2019 2020 2021

	mysql_tp = (enum_field_types) mysql_type;

	switch (mysql_tp) {

2022
	case MYSQL_TYPE_STRING:
2023
	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:
2028
        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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                                  a, a_length,
2056
                                                 b, b_length, 0);
2057
		if (ret < 0) {
2058
		        return(-1);
2059
		} else if (ret > 0) {
2060
		        return(1);
2061
		} else {
2062
		        return(0);
2063
	        }
2064 2065 2066 2067 2068 2069 2070 2071 2072
	default:
		assert(0);
	}

	return(0);
}
}

/******************************************************************
2073
Converts a MySQL type to an InnoDB type. */
2074 2075
inline
ulint
2076 2077 2078
get_innobase_type_from_mysql_type(
/*==============================*/
			/* out: DATA_BINARY, DATA_VARCHAR, ... */
2079 2080
	Field*	field)	/* in: MySQL field */
{
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	/* 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 */
2084 2085

	switch (field->type()) {
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	        /* NOTE that we only allow string types in DATA_MYSQL
		and DATA_VARMYSQL */
2088 2089
                case MYSQL_TYPE_VAR_STRING:
                case MYSQL_TYPE_VARCHAR: if (field->binary()) {
2090 2091
						return(DATA_BINARY);
					} else if (strcmp(
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2092 2093
						  field->charset()->name,
						 "latin1_swedish_ci") == 0) {
2094
						return(DATA_VARCHAR);
2095 2096
					} else {
						return(DATA_VARMYSQL);
2097
					}
2098
		case MYSQL_TYPE_STRING: if (field->binary()) {
2099 2100 2101

						return(DATA_FIXBINARY);
					} else if (strcmp(
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						   field->charset()->name,
						   "latin1_swedish_ci") == 0) {
2104
						return(DATA_CHAR);
2105 2106
					} else {
						return(DATA_MYSQL);
2107
					}
2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118
		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:
2119 2120 2121
		case FIELD_TYPE_TIME:
		case FIELD_TYPE_TIMESTAMP:
					return(DATA_INT);
2122
		case FIELD_TYPE_FLOAT:
2123
					return(DATA_FLOAT);
2124
		case FIELD_TYPE_DOUBLE:
2125
					return(DATA_DOUBLE);
2126
		case FIELD_TYPE_DECIMAL:
2127 2128 2129 2130 2131 2132
					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);
}
2139

2140
/***********************************************************************
2141
Stores a key value for a row to a buffer. */
2142 2143 2144 2145 2146 2147 2148

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
2149 2150
				format) */
	uint		buff_len,/* in: buffer length */
2151
	const mysql_byte* record)/* in: row in MySQL format */
2152 2153 2154 2155 2156
{
	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;
2162

2163 2164
  	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. */	

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	/* 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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2185
	bzero(buff, buff_len);
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2187
  	for (; key_part != end; key_part++) {
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	        is_null = FALSE;
2189 2190 2191 2192

    		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++;
2199
    		}
2200

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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) {
2208

2209
			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);
2232
			*((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;
		}
2248 2249
  	}

2250
	ut_a(buff <= buff_start + buff_len);
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	DBUG_RETURN((uint)(buff - buff_start));
2253 2254 2255
}

/******************************************************************
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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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2258
static
2259
void
2260 2261 2262 2263 2264 2265 2266 2267 2268
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 */
2269
{
2270 2271
	dict_index_t*	index;
	dict_index_t*	clust_index;
2272
	mysql_row_templ_t* templ;
2273
	Field*		field;
2274 2275
	ulint		n_fields;
	ulint		n_requested_fields	= 0;
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2276
	ibool		fetch_all_in_key	= FALSE;
2277 2278 2279 2280 2281 2282 2283
	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. */ 
2284
	ulint		i;
2285

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2286 2287 2288 2289
	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) {
2297

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		/* We know we must at least fetch all columns in the key, or
		all columns in the table */
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2301
		if (prebuilt->read_just_key) {
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2302
			/* MySQL has instructed us that it is enough to
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			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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			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;
	    }
2323 2324
	}

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	clust_index = dict_table_get_first_index_noninline(prebuilt->table);
2326

2327
	if (templ_type == ROW_MYSQL_REC_FIELDS) {
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		index = prebuilt->index;
2329 2330
	} else {
		index = clust_index;
2331
	}
2332

2333 2334 2335 2336 2337 2338 2339
	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 */
	}
2340

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	n_fields = (ulint)table->fields; /* number of columns */
2342 2343 2344 2345 2346 2347

	if (!prebuilt->mysql_template) {
		prebuilt->mysql_template = (mysql_row_templ_t*)
						mem_alloc_noninline(
					n_fields * sizeof(mysql_row_templ_t));
	}
2348

2349 2350
	prebuilt->template_type = templ_type;
	prebuilt->null_bitmap_len = table->null_bytes;
2351

2352 2353
	prebuilt->templ_contains_blob = FALSE;

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	/* Note that in InnoDB, i is the column number. MySQL calls columns
	'fields'. */
2356
	for (i = 0; i < n_fields; i++) {
2357
		templ = prebuilt->mysql_template + n_requested_fields;
2358 2359
		field = table->field[i];

2360 2361
                ibool index_contains_field=
                  dict_index_contains_col_or_prefix(index, i);
2362 2363 2364

		if (templ_type == ROW_MYSQL_REC_FIELDS && 
                    ((prebuilt->read_just_key && !index_contains_field) ||
2365 2366 2367 2368
		     (!(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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			/* This field is not needed in the query, skip it */
2371 2372 2373 2374 2375

			goto skip_field;
		}

		n_requested_fields++;
2376

2377
		templ->col_no = i;
2378

2379 2380 2381
		if (index == clust_index) {
			templ->rec_field_no = (index->table->cols + i)
								->clust_pos;
2382
		} else {
2383 2384
			templ->rec_field_no = dict_index_get_nth_col_pos(
								index, i);
2385 2386
		}

2387 2388 2389 2390 2391 2392 2393 2394
		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]);
2395

2396 2397 2398 2399
			templ->mysql_null_bit_mask = (ulint) field->null_bit;
		} else {
			templ->mysql_null_bit_mask = 0;
		}
2400

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

2404 2405 2406
		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);
2407

2408 2409
		if (templ->type == DATA_BLOB) {
			prebuilt->templ_contains_blob = TRUE;
2410
		}
2411 2412 2413
skip_field:
		;
	}
2414

2415
	prebuilt->n_template = n_requested_fields;
2416

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2417
	if (index != clust_index && prebuilt->need_to_access_clustered) {
2418 2419 2420 2421
		/* 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;
2422

2423 2424 2425
			templ->rec_field_no =
			    (index->table->cols + templ->col_no)->clust_pos;
		}
2426
	}
2427 2428 2429
}

/************************************************************************
2430
Stores a row in an InnoDB database, to the table specified in this
2431 2432 2433 2434 2435
handle. */

int
ha_innobase::write_row(
/*===================*/
2436 2437
				/* out: error code */
	mysql_byte* 	record)	/* in: a row in MySQL format */
2438
{
2439
	row_prebuilt_t* prebuilt = (row_prebuilt_t*)innobase_prebuilt;
2440
  	int 		error;
2441
	longlong	auto_inc;
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2442
	longlong	dummy;
2443 2444
	ibool           incremented_auto_inc_for_stat = FALSE;
	ibool           incremented_auto_inc_counter = FALSE;
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2445
	ibool           auto_inc_used= FALSE;
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2446

2447
  	DBUG_ENTER("ha_innobase::write_row");
2448

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2449 2450 2451 2452
	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"
2453 2454 2455 2456 2457 2458 2459 2460 2461
"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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2462
			((byte*)(&(current_thd->transaction.all))) - 100, 200);
2463 2464
		putc('\n', stderr);
		ut_error;
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2465
	}
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2466

2467 2468
  	statistic_increment(current_thd->status_var.ha_write_count,
			    &LOCK_status);
2469

2470 2471
        if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_INSERT)
                table->timestamp_field->set_time();
2472

2473
	if (user_thd->lex->sql_command == SQLCOM_ALTER_TABLE
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2474
	    && num_write_row >= 10000) {
2475 2476 2477 2478 2479 2480 2481 2482
		/* 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. */
2483

2484
		dict_table_t*	src_table;
2485 2486
		ibool		mode;

2487
		num_write_row = 0;
2488

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2489 2490
		/* Commit the transaction.  This will release the table
		locks, so they have to be acquired again. */
2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506 2507 2508 2509 2510

		/* 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. */

2511 2512 2513 2514 2515 2516
			/* 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;
2517 2518 2519 2520 2521
		} 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)) {
2522 2523 2524 2525 2526 2527 2528 2529 2530
				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. */
2531
			row_lock_table_for_mysql(prebuilt, src_table, mode);
2532 2533 2534
			/* We will need an IX lock on the destination table. */
		        prebuilt->sql_stat_start = TRUE;
		}
2535 2536
	}

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2537 2538
	num_write_row++;

2539 2540 2541
	if (last_query_id != user_thd->query_id) {
	        prebuilt->sql_stat_start = TRUE;
                last_query_id = user_thd->query_id;
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2542 2543

		innobase_release_stat_resources(prebuilt->trx);
2544 2545
	}

2546
  	if (table->next_number_field && record == table->record[0]) {
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2547 2548
		/* This is the case where the table has an
		auto-increment column */
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2549 2550 2551 2552 2553 2554 2555 2556 2557 2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571 2572 2573

		/* 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;
		}

2574 2575 2576 2577 2578 2579
		/*
                  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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2580

2581
	}
2582

2583 2584 2585 2586
	if (prebuilt->mysql_template == NULL
			|| prebuilt->template_type != ROW_MYSQL_WHOLE_ROW) {
		/* Build the template used in converting quickly between
		the two database formats */
2587

2588 2589
		build_template(prebuilt, NULL, table, ROW_MYSQL_WHOLE_ROW);
	}
2590

2591
	innodb_srv_conc_enter_innodb(prebuilt->trx);
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Merge  
monty@donna.mysql.fi committed
2592

2593
	error = row_insert_for_mysql((byte*) record, prebuilt);
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Merge  
monty@donna.mysql.fi committed
2594

2595
	if (error == DB_SUCCESS && auto_inc_used) {
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Merge  
monty@donna.mysql.fi committed
2596

2597
        /* Fetch the value that was set in the autoincrement field */
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2598

2599 2600 2601
          auto_inc = table->next_number_field->val_int();

          if (auto_inc != 0) {
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2602 2603 2604
			/* This call will calculate the max of the current
			value and the value supplied by the user and
			update the counter accordingly */
2605 2606 2607 2608 2609 2610 2611 2612

			/* 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. */

2613
            error = row_lock_table_autoinc_for_mysql(prebuilt);
2614

2615
            if (error != DB_SUCCESS) {
2616

2617 2618 2619 2620 2621 2622
              error = convert_error_code_to_mysql(error, user_thd);
              goto func_exit;
            }
            dict_table_autoinc_update(prebuilt->table, auto_inc);
          }
        }
2623

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2624
	innodb_srv_conc_exit_innodb(prebuilt->trx);
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Merge  
monty@donna.mysql.fi committed
2625

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heikki@hundin.mysql.fi committed
2626
	error = convert_error_code_to_mysql(error, user_thd);
2627

2628
	/* Tell InnoDB server that there might be work for
2629
	utility threads: */
2630
func_exit:
2631
	innobase_active_small();
2632 2633 2634 2635

  	DBUG_RETURN(error);
}

2636

2637
/******************************************************************
2638
Converts field data for storage in an InnoDB update vector. */
2639 2640 2641 2642 2643 2644 2645 2646 2647 2648
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 */
2649
	ulint		col_type,/* in: data type in InnoDB type numbers */
2650
	ulint		is_unsigned)/* in: != 0 if an unsigned integer type */
2651
{
2652 2653 2654 2655
	uint	i;

	if (len == UNIV_SQL_NULL) {
		data = NULL;
2656 2657 2658 2659 2660 2661
        } else if (col_type == DATA_VARCHAR || col_type == DATA_BINARY
                   || col_type == DATA_VARMYSQL) {
                /* Remove trailing spaces */
                while (len > 0 && data[len - 1] == ' ') {
                        len--;
                }
2662
	} else if (col_type == DATA_INT) {
2663
		/* Store integer data in InnoDB in a big-endian
2664
		format, sign bit negated, if signed */
2665

2666 2667 2668 2669 2670 2671 2672 2673 2674 2675 2676
		for (i = 0; i < len; i++) {
			buf[len - 1 - i] = data[i];
		}

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

		data = buf;

		buf += len;
2677
	}
2678 2679 2680 2681 2682 2683 2684 2685 2686 2687 2688 2689 2690 2691 2692 2693 2694 2695

	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 */
2696 2697
	struct st_table* table,		/* in: table in MySQL data
					dictionary */
2698
	mysql_byte*	upd_buff,	/* in: buffer to use */
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2699
	ulint		buff_len,	/* in: buffer length */
2700
	row_prebuilt_t*	prebuilt,	/* in: InnoDB prebuilt struct */
2701 2702
	THD*		thd)		/* in: user thread */
{
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2703
	mysql_byte*	original_upd_buff = upd_buff;
2704
	Field*		field;
2705 2706 2707
	uint		n_fields;
	ulint		o_len;
	ulint		n_len;
2708 2709 2710
	byte*	        o_ptr;
        byte*	        n_ptr;
        byte*	        buf;
2711
	upd_field_t*	ufield;
2712 2713
	ulint		col_type;
	ulint		is_unsigned;
2714
	ulint		n_changed = 0;
2715
	uint		i;
2716 2717 2718

	n_fields = table->fields;

2719
	/* We use upd_buff to convert changed fields */
2720
	buf = (byte*) upd_buff;
2721

2722 2723 2724
	for (i = 0; i < n_fields; i++) {
		field = table->field[i];

2725
		/* if (thd->query_id != field->query_id) { */
2726 2727
			/* TODO: check that these fields cannot have
			changed! */
2728

2729 2730
		/*	goto skip_field;
		}*/
2731

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2732 2733
		o_ptr = (byte*) old_row + get_field_offset(table, field);
		n_ptr = (byte*) new_row + get_field_offset(table, field);
2734 2735 2736
		o_len = field->pack_length();
		n_len = field->pack_length();

2737
		col_type = get_innobase_type_from_mysql_type(field);
2738
		is_unsigned = (ulint) (field->flags & UNSIGNED_FLAG);
2739 2740 2741 2742 2743 2744 2745 2746 2747 2748

		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:
2749 2750 2751 2752
			o_ptr = row_mysql_read_var_ref_noninline(&o_len,
								o_ptr);
			n_ptr = row_mysql_read_var_ref_noninline(&n_len,
								n_ptr);
2753 2754 2755
		default:
			;
		}
2756

2757
		if (field->null_ptr) {
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2758 2759
			if (field_in_record_is_null(table, field,
							(char*) old_row)) {
2760 2761
				o_len = UNIV_SQL_NULL;
			}
2762

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2763 2764
			if (field_in_record_is_null(table, field,
							(char*) new_row)) {
2765 2766 2767 2768 2769 2770 2771 2772 2773 2774
				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;

2775 2776 2777 2778
			buf = (byte*)
                          innobase_convert_and_store_changed_col(ufield,
					  (mysql_byte*)buf,
					  (mysql_byte*)n_ptr, n_len, col_type,
2779
						is_unsigned);
2780
			ufield->exp = NULL;
2781 2782
			ufield->field_no =
					(prebuilt->table->cols + i)->clust_pos;
2783 2784 2785 2786 2787 2788 2789
			n_changed++;
		}
	}

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

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2790 2791
	ut_a(buf <= (byte*)original_upd_buff + buff_len);

2792 2793 2794 2795 2796 2797 2798
	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.
2799
TODO: currently InnoDB does not prevent the 'Halloween problem':
2800 2801
in a searched update a single row can get updated several times
if its index columns are updated! */
2802

2803 2804 2805 2806
int
ha_innobase::update_row(
/*====================*/
					/* out: error number or 0 */
2807 2808
	const mysql_byte* 	old_row,/* in: old row in MySQL format */
	mysql_byte* 		new_row)/* in: new row in MySQL format */
2809 2810 2811 2812 2813
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	upd_t*		uvect;
	int		error = 0;

2814
	DBUG_ENTER("ha_innobase::update_row");
2815

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2816 2817
	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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2818

2819 2820
        if (table->timestamp_field_type & TIMESTAMP_AUTO_SET_ON_UPDATE)
                table->timestamp_field->set_time();
2821

2822 2823 2824
	if (last_query_id != user_thd->query_id) {
	        prebuilt->sql_stat_start = TRUE;
                last_query_id = user_thd->query_id;
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2825 2826

		innobase_release_stat_resources(prebuilt->trx);
2827 2828
	}

2829 2830 2831 2832 2833
	if (prebuilt->upd_node) {
		uvect = prebuilt->upd_node->update;
	} else {
		uvect = row_get_prebuilt_update_vector(prebuilt);
	}
2834 2835 2836 2837

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

2838
	calc_row_difference(uvect, (mysql_byte*) old_row, new_row, table,
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2839 2840 2841
			upd_buff, (ulint)upd_and_key_val_buff_len,
			prebuilt, user_thd);

2842 2843 2844
	/* This is not a delete */
	prebuilt->upd_node->is_delete = FALSE;

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2845
	assert(prebuilt->template_type == ROW_MYSQL_WHOLE_ROW);
2846

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2847
	innodb_srv_conc_enter_innodb(prebuilt->trx);
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Merge  
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2848

2849
	error = row_update_for_mysql((byte*) old_row, prebuilt);
2850

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heikki@hundin.mysql.fi committed
2851
	innodb_srv_conc_exit_innodb(prebuilt->trx);
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Merge  
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2852

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2853
	error = convert_error_code_to_mysql(error, user_thd);
2854

2855
	/* Tell InnoDB server that there might be work for
2856 2857
	utility threads: */

2858
	innobase_active_small();
2859 2860 2861 2862 2863 2864 2865 2866 2867 2868

	DBUG_RETURN(error);
}

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

int
ha_innobase::delete_row(
/*====================*/
2869 2870
					/* out: error number or 0 */
	const mysql_byte* record)	/* in: a row in MySQL format */
2871 2872 2873 2874
{
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	int		error = 0;

2875
	DBUG_ENTER("ha_innobase::delete_row");
2876

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2877 2878
	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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2879

2880 2881 2882
	if (last_query_id != user_thd->query_id) {
	        prebuilt->sql_stat_start = TRUE;
                last_query_id = user_thd->query_id;
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2883 2884

		innobase_release_stat_resources(prebuilt->trx);
2885 2886
	}

2887 2888 2889
	if (!prebuilt->upd_node) {
		row_get_prebuilt_update_vector(prebuilt);
	}
2890 2891

	/* This is a delete */
2892

2893
	prebuilt->upd_node->is_delete = TRUE;
2894

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2895
	innodb_srv_conc_enter_innodb(prebuilt->trx);
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Merge  
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2896

2897
	error = row_update_for_mysql((byte*) record, prebuilt);
2898

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heikki@hundin.mysql.fi committed
2899
	innodb_srv_conc_exit_innodb(prebuilt->trx);
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Merge  
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2900

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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);
}

/**********************************************************************
2955
Currently does nothing. */
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int
ha_innobase::index_end(void)
/*========================*/
{
	int 	error	= 0;
  	DBUG_ENTER("index_end");
2963
        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
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					row */
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	const mysql_byte* 	key_ptr,/* in: key value; if this is NULL
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					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 */
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	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);
3092

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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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	}

3100
	index = prebuilt->index;
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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 */
3104

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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 */

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		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);
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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 */
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{
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        return(index_read(buf, key_ptr, key_len, HA_READ_PREFIX_LAST));
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}

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/************************************************************************
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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
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			InnoDB */
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{
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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");
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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;
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	if (keynr != MAX_KEY && table->keys > 0) {
		key = table->key_info + active_index;
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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);
	}
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	assert(prebuilt->search_tuple != 0);
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	dtuple_set_n_fields(prebuilt->search_tuple, prebuilt->index->n_fields);
3228

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	dict_index_copy_types(prebuilt->search_tuple, prebuilt->index,
3230
			prebuilt->index->n_fields);
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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. */
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	build_template(prebuilt, user_thd, table, ROW_MYSQL_REC_FIELDS);
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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 */
3255
	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;
3287

3288
	DBUG_ENTER("general_fetch");
3289

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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 */
3344 3345
	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 */
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	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(
/*=====================*/
3376
				/* out: 0, HA_ERR_END_OF_FILE,
3377 3378
				or error code */
	mysql_byte*	buf)	/* in/out: buffer for the row */
3379 3380 3381 3382
{
	int	error;

  	DBUG_ENTER("index_first");
3383 3384
  	statistic_increment(current_thd->status_var.ha_read_first_count,
			    &LOCK_status);
3385 3386 3387

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

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        /* 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;
  	}

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  	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(
/*====================*/
3404 3405
				/* out: 0, HA_ERR_END_OF_FILE, or error code */
	mysql_byte*	buf)	/* in/out: buffer for the row */
3406 3407 3408
{
	int	error;

3409
  	DBUG_ENTER("index_last");
3410 3411
  	statistic_increment(current_thd->status_var.ha_read_last_count,
			    &LOCK_status);
3412 3413 3414

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

3415
        /* MySQL does not seem to allow this to return HA_ERR_KEY_NOT_FOUND */
3416 3417 3418 3419 3420 3421 3422 3423 3424 3425 3426 3427 3428 3429 3430

  	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 */
3431
	bool	scan)	/* in: ???????? */
3432
{
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3433
	int	err;
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3434

3435
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
3436

3437 3438 3439
	/* Store the active index value so that we can restore the original
	value after a scan */

3440
	if (prebuilt->clust_index_was_generated) {
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monty@donna.mysql.fi committed
3441
		err = change_active_index(MAX_KEY);
3442
	} else {
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Merge  
monty@donna.mysql.fi committed
3443
		err = change_active_index(primary_key);
3444
	}
3445

3446
  	start_of_scan = 1;
3447

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3448
 	return(err);
3449 3450 3451
}

/*********************************************************************
3452
Ends a table scan. */
3453 3454 3455 3456 3457 3458

int
ha_innobase::rnd_end(void)
/*======================*/
				/* out: 0 or error number */
{
3459
	return(index_end());
3460 3461 3462 3463 3464 3465 3466 3467 3468 3469
}

/*********************************************************************
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 */
3470
	mysql_byte* buf)/* in/out: returns the row in this buffer,
3471 3472
			in MySQL format */
{
3473
	int	error;
3474 3475

  	DBUG_ENTER("rnd_next");
3476 3477
  	statistic_increment(current_thd->status_var.ha_read_rnd_next_count,
			    &LOCK_status);
3478

3479
  	if (start_of_scan) {
3480 3481 3482 3483
		error = index_first(buf);
		if (error == HA_ERR_KEY_NOT_FOUND) {
			error = HA_ERR_END_OF_FILE;
		}
3484
		start_of_scan = 0;
3485
	} else {
3486
		error = general_fetch(buf, ROW_SEL_NEXT, 0);
3487
	}
3488

3489 3490 3491 3492
  	DBUG_RETURN(error);
}

/**************************************************************************
3493
Fetches a row from the table based on a row reference. */
3494

3495 3496 3497
int
ha_innobase::rnd_pos(
/*=================*/
3498 3499 3500
				/* out: 0, HA_ERR_KEY_NOT_FOUND,
				or error code */
	mysql_byte* 	buf,	/* in/out: buffer for the row */
3501 3502 3503 3504 3505
	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 */
3506
{
3507 3508 3509
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	int		error;
	uint		keynr	= active_index;
3510
	DBUG_ENTER("rnd_pos");
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3511
	DBUG_DUMP("key", (char*) pos, ref_length);
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3512

3513 3514
	statistic_increment(current_thd->status_var.ha_read_rnd_count,
			    &LOCK_status);
3515

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3516 3517
	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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3518

3519 3520 3521 3522
	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
3523
		that MySQL knows of */
3524

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3525
		error = change_active_index(MAX_KEY);
3526
	} else {
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Merge  
monty@donna.mysql.fi committed
3527
		error = change_active_index(primary_key);
3528
	}
3529

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Merge  
monty@donna.mysql.fi committed
3530
	if (error) {
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3531
	        DBUG_PRINT("error",("Got error: %ld",error));
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3532 3533
		DBUG_RETURN(error);
	}
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3534

3535 3536 3537 3538
	/* 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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3539 3540 3541 3542
	if (error)
	{
	  DBUG_PRINT("error",("Got error: %ld",error));
	}
3543
	change_active_index(keynr);
3544

3545 3546 3547 3548
  	DBUG_RETURN(error);
}

/*************************************************************************
3549
Stores a reference to the current row to 'ref' field of the handle. Note
3550 3551
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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3552
is the current 'position' of the handle, because if row ref is actually
3553
the row id internally generated in InnoDB, then 'record' does not contain
3554 3555
it. We just guess that the row id must be for the record where the handle
was positioned the last time. */
3556 3557 3558 3559

void
ha_innobase::position(
/*==================*/
3560
	const mysql_byte*	record)	/* in: row in MySQL format */
3561
{
3562 3563
	row_prebuilt_t*	prebuilt = (row_prebuilt_t*) innobase_prebuilt;
	uint		len;
3564

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3565 3566
	ut_ad(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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3567

3568 3569 3570 3571
	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
3572
		that MySQL knows of */
3573 3574 3575 3576 3577

		len = DATA_ROW_ID_LEN;

		memcpy(ref, prebuilt->row_id, len);
	} else {
3578 3579
		len = store_key_val_for_row(primary_key, (char*)ref,
							 ref_length, record);
3580
	}
3581

3582 3583 3584
	/* 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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3585
  
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3586 3587 3588
	if (len != ref_length) {
	        fprintf(stderr,
	 "InnoDB: Error: stored ref len is %lu, but table ref len is %lu\n",
3589
		  (ulong)len, (ulong)ref_length);
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3590
	}
3591 3592 3593
}

/*********************************************************************
3594
Creates a table definition to an InnoDB database. */
3595 3596 3597 3598
static
int
create_table_def(
/*=============*/
3599
	trx_t*		trx,		/* in: InnoDB transaction handle */
3600 3601
	TABLE*		form,		/* in: information on table
					columns and indexes */
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3602
	const char*	table_name,	/* in: table name */
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3603
	const char*	path_of_temp_table,/* in: if this is a table explicitly
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3604 3605 3606 3607 3608 3609 3610
					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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3611
	ibool		comp)		/* in: TRUE=compact record format */
3612 3613 3614 3615 3616 3617
{
	Field*		field;
	dict_table_t*	table;
	ulint		n_cols;
  	int 		error;
  	ulint		col_type;
3618 3619
  	ulint		nulls_allowed;
	ulint		unsigned_type;
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3620
	ulint		binary_type;
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3621
	ulint		charset_no;
3622
  	ulint		i;
3623

3624 3625 3626 3627 3628
  	DBUG_ENTER("create_table_def");
  	DBUG_PRINT("enter", ("table_name: %s", table_name));

	n_cols = form->fields;

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3629 3630
	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */
3631

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3632
	table = dict_mem_table_create(table_name, 0, n_cols, comp);
3633

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3634 3635 3636 3637 3638
	if (path_of_temp_table) {
		table->dir_path_of_temp_table =
			mem_heap_strdup(table->heap, path_of_temp_table);
	}

3639 3640 3641
	for (i = 0; i < n_cols; i++) {
		field = form->field[i];

3642 3643 3644 3645 3646 3647 3648 3649 3650 3651 3652 3653
		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;
		}
3654

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3655
		if (field->binary()) {
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3656 3657 3658 3659 3660
			binary_type = DATA_BINARY_TYPE;
		} else {
			binary_type = 0;
		}

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3661 3662 3663 3664 3665 3666 3667 3668 3669 3670
		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 */
		}

3671
		dict_mem_table_add_col(table, (char*) field->field_name,
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3672 3673
					col_type, dtype_form_prtype( 
					(ulint)field->type()
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3674
					| nulls_allowed | unsigned_type
3675
					| binary_type,
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3676
					+ charset_no),
3677 3678 3679 3680 3681
					field->pack_length(), 0);
	}

	error = row_create_table_for_mysql(table, trx);

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3682
	error = convert_error_code_to_mysql(error, NULL);
3683 3684 3685 3686 3687

	DBUG_RETURN(error);
}

/*********************************************************************
3688
Creates an index in an InnoDB database. */
3689 3690
static
int
3691 3692
create_index(
/*=========*/
3693
	trx_t*		trx,		/* in: InnoDB transaction handle */
3694 3695 3696 3697 3698
	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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3699
	Field*		field;
3700
	dict_index_t*	index;
3701
  	int 		error;
3702 3703 3704 3705
	ulint		n_fields;
	KEY*		key;
	KEY_PART_INFO*	key_part;
	ulint		ind_type;
3706 3707
	ulint		col_type;
	ulint		prefix_len;
3708
  	ulint		i;
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heikki@hundin.mysql.fi committed
3709
  	ulint		j;
3710

3711
  	DBUG_ENTER("create_index");
3712

3713 3714 3715
	key = form->key_info + key_num;

    	n_fields = key->key_parts;
3716

3717 3718
    	ind_type = 0;

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3719
    	if (key_num == form->primary_key) {
3720 3721
		ind_type = ind_type | DICT_CLUSTERED;
	}
3722

3723 3724 3725 3726
	if (key->flags & HA_NOSAME ) {
		ind_type = ind_type | DICT_UNIQUE;
	}

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3727 3728
	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */
3729 3730 3731 3732 3733 3734

	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;

3735
		/* (The flag HA_PART_KEY_SEG denotes in MySQL a column prefix
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3736 3737 3738 3739 3740 3741 3742 3743 3744 3745
		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;
		for (j = 0; j < form->fields; j++) {

			field = form->field[j];

3746 3747 3748
			if (0 == innobase_strcasecmp(
					field->field_name,
					key_part->field->field_name)) {
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3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761
				/* Found the corresponding column */

				break;
			}
		}

		ut_a(j < form->fields);

		col_type = get_innobase_type_from_mysql_type(key_part->field);

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

3762 3763 3764 3765 3766 3767 3768 3769
		        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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3770 3771
"InnoDB: on an inappropriate data type. Table name %s, column name %s.\n",
				  table_name, key_part->field->field_name);
3772 3773 3774 3775 3776
			        
			        prefix_len = 0;
			}
		} else {
		        prefix_len = 0;
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3777 3778
		}

3779 3780
		/* We assume all fields should be sorted in ascending
		order, hence the '0': */
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3781

3782
		dict_mem_index_add_field(index,
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3783 3784
				(char*) key_part->field->field_name,
				0, prefix_len);
3785 3786 3787 3788
	}

	error = row_create_index_for_mysql(index, trx);

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3789
	error = convert_error_code_to_mysql(error, NULL);
3790 3791 3792 3793 3794

	DBUG_RETURN(error);
}

/*********************************************************************
3795
Creates an index to an InnoDB table when the user has defined no
3796
primary index. */
3797 3798
static
int
3799 3800
create_clustered_index_when_no_primary(
/*===================================*/
3801
	trx_t*		trx,		/* in: InnoDB transaction handle */
3802 3803 3804
	const char*	table_name)	/* in: table name */
{
	dict_index_t*	index;
3805 3806
  	int 		error;

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3807 3808
	/* We pass 0 as the space id, and determine at a lower level the space
	id where to store the table */
3809

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3810 3811 3812
	index = dict_mem_index_create((char*) table_name,
				      (char*) "GEN_CLUST_INDEX",
				      0, DICT_CLUSTERED, 0);
3813 3814
	error = row_create_index_for_mysql(index, trx);

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3815
	error = convert_error_code_to_mysql(error, NULL);
3816

3817
	return(error);
3818 3819 3820
}

/*********************************************************************
3821
Creates a new table to an InnoDB database. */
3822 3823 3824 3825 3826 3827 3828 3829

int
ha_innobase::create(
/*================*/
					/* out: error number */
	const char*	name,		/* in: table name */
	TABLE*		form,		/* in: information on table
					columns and indexes */
3830 3831 3832
	HA_CREATE_INFO*	create_info)	/* in: more information of the
					created table, contains also the
					create statement string */
3833 3834 3835
{
	int		error;
	dict_table_t*	innobase_table;
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	trx_t*		parent_trx;
3837
	trx_t*		trx;
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3838
	int		primary_key_no;
3839
	uint		i;
3840 3841
	char		name2[FN_REFLEN];
	char		norm_name[FN_REFLEN];
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3842
	THD		*thd= current_thd;
3843
	ib_longlong     auto_inc_value;
3844

3845 3846
  	DBUG_ENTER("ha_innobase::create");

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3847
	DBUG_ASSERT(thd != NULL);
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3848

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3849 3850 3851 3852
	if (form->fields > 1000) {
		/* The limit probably should be REC_MAX_N_FIELDS - 3 = 1020,
		but we play safe here */

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3853
	        DBUG_RETURN(HA_ERR_TO_BIG_ROW);
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	} 

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	/* Get the transaction associated with the current thd, or create one
	if not yet created */
	
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3859
	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);	
	
3866
	trx = trx_allocate_for_mysql();
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3867 3868 3869
		
	trx->mysql_thd = thd;
	trx->mysql_query_str = &((*thd).query);
3870

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3871
	if (thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
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		trx->check_foreigns = FALSE;
	}

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3875
	if (thd->options & OPTION_RELAXED_UNIQUE_CHECKS) {
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		trx->check_unique_secondary = FALSE;
	}

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	if (lower_case_table_names) {
		srv_lower_case_table_names = TRUE;
	} else {
		srv_lower_case_table_names = FALSE;
	}
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3884

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heikki@hundin.mysql.fi committed
3885
	fn_format(name2, name, "", "", 2);	// Remove the .frm extension
3886 3887

	normalize_table_name(norm_name, name2);
3888

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heikki@hundin.mysql.fi committed
3889
	/* Latch the InnoDB data dictionary exclusively so that no deadlocks
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heikki@hundin.mysql.fi committed
3890
	or lock waits can happen in it during a table create operation.
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3891
	Drop table etc. do this latching in row0mysql.c. */
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3892

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3893
	row_mysql_lock_data_dictionary(trx);
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heikki@hundin.mysql.fi committed
3894 3895

	/* Create the table definition in InnoDB */
3896

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marko@hundin.mysql.fi committed
3897 3898 3899
	error = create_table_def(trx, form, norm_name,
		create_info->options & HA_LEX_CREATE_TMP_TABLE ? name2 : NULL,
		!(form->db_options_in_use & HA_OPTION_PACK_RECORD));
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heikki@hundin.mysql.fi committed
3900

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heikki@hundin.mysql.fi committed
3901
  	if (error) {
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heikki@hundin.mysql.fi committed
3902
		innobase_commit_low(trx);
3903

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3904
		row_mysql_unlock_data_dictionary(trx);
3905 3906 3907 3908 3909 3910

  		trx_free_for_mysql(trx);

 		DBUG_RETURN(error);
 	}

3911 3912
	/* Look for a primary key */

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3913 3914 3915
	primary_key_no= (table->primary_key != MAX_KEY ?
			 (int) table->primary_key : 
			 -1);
3916

3917 3918 3919
	/* Our function row_get_mysql_key_number_for_index assumes
	the primary key is always number 0, if it exists */

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3920
	DBUG_ASSERT(primary_key_no == -1 || primary_key_no == 0);
3921

3922 3923
	/* Create the keys */

3924 3925 3926
	if (form->keys == 0 || primary_key_no == -1) {
		/* Create an index which is used as the clustered index;
		order the rows by their row id which is internally generated
3927
		by InnoDB */
3928

3929
		error = create_clustered_index_when_no_primary(trx,
3930
							norm_name);
3931
  		if (error) {
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3932 3933
			innobase_commit_low(trx);

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3934
			row_mysql_unlock_data_dictionary(trx);
3935

3936 3937 3938 3939
			trx_free_for_mysql(trx);

			DBUG_RETURN(error);
      		}
3940 3941 3942
	}

	if (primary_key_no != -1) {
3943
		/* In InnoDB the clustered index must always be created
3944
		first */
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3945 3946
	    	if ((error = create_index(trx, form, norm_name,
					  (uint) primary_key_no))) {
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3947 3948
			innobase_commit_low(trx);

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3949
			row_mysql_unlock_data_dictionary(trx);
3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960

  			trx_free_for_mysql(trx);

			DBUG_RETURN(error);
      		}
      	}

	for (i = 0; i < form->keys; i++) {

		if (i != (uint) primary_key_no) {

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3961
    			if ((error = create_index(trx, form, norm_name, i))) {
3962

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3963
			  	innobase_commit_low(trx);
3964

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heikki@hundin.mysql.fi committed
3965
				row_mysql_unlock_data_dictionary(trx);
3966 3967 3968 3969 3970

  				trx_free_for_mysql(trx);

				DBUG_RETURN(error);
      			}
3971
      		}
3972
  	}
3973

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heikki@hundin.mysql.fi committed
3974
	if (current_thd->query != NULL) {
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3975
		LEX_STRING q;
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3976

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3977 3978 3979 3980 3981 3982 3983 3984 3985 3986 3987
		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);
		}
3988

3989 3990
		if (error) {
			innobase_commit_low(trx);
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heikki@hundin.mysql.fi committed
3991

3992
			row_mysql_unlock_data_dictionary(trx);
3993

3994
  			trx_free_for_mysql(trx);
3995

3996 3997
			DBUG_RETURN(error);
		}
3998 3999
	}

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heikki@hundin.mysql.fi committed
4000 4001
  	innobase_commit_low(trx);

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heikki@hundin.mysql.fi committed
4002
	row_mysql_unlock_data_dictionary(trx);
4003

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Merge  
monty@donna.mysql.fi committed
4004 4005 4006
	/* 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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4007

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heikki@hundin.mysql.fi committed
4008
	log_buffer_flush_to_disk();
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Merge  
monty@donna.mysql.fi committed
4009

4010
	innobase_table = dict_table_get(norm_name, NULL);
4011

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monty@hundin.mysql.fi committed
4012
	DBUG_ASSERT(innobase_table != 0);
4013

4014
	if ((thd->lex->create_info.used_fields & HA_CREATE_USED_AUTO) &&
4015 4016
	   (thd->lex->create_info.auto_increment_value != 0)) {

4017 4018
		/* Query was ALTER TABLE...AUTO_INCREMENT = x; or 
		CREATE TABLE ...AUTO_INCREMENT = x; Find out a table
4019 4020
		definition from the dictionary and get the current value
		of the auto increment field. Set a new value to the
4021 4022
		auto increment field if the value is greater than the
		maximum value in the column. */
4023 4024 4025 4026 4027

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

4028
	/* Tell the InnoDB server that there might be work for
4029 4030 4031 4032 4033 4034 4035 4036 4037
	utility threads: */

	srv_active_wake_master_thread();

  	trx_free_for_mysql(trx);

	DBUG_RETURN(0);
}

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4038 4039 4040 4041 4042 4043 4044 4045 4046 4047
/*********************************************************************
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;
4048
	dict_table_t*	dict_table;
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	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);

4058
	dict_table = prebuilt->table;
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4059 4060 4061
	trx = prebuilt->trx;

	if (discard) {
4062
		err = row_discard_tablespace_for_mysql(dict_table->name, trx);
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4063
	} else {
4064
		err = row_import_tablespace_for_mysql(dict_table->name, trx);
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4065 4066 4067 4068 4069 4070 4071 4072 4073
	}

	if (err == DB_SUCCESS) {
		DBUG_RETURN(0);
	}

	DBUG_RETURN(-1);
}

4074
/*********************************************************************
4075
Drops a table from an InnoDB database. Before calling this function,
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monty@donna.mysql.com committed
4076 4077
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
4078 4079
operation inside InnoDB will remove all locks any user has on the table
inside InnoDB. */
4080 4081 4082 4083

int
ha_innobase::delete_table(
/*======================*/
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4084 4085
				/* out: error number */
	const char*	name)	/* in: table name */
4086 4087 4088
{
	ulint	name_len;
	int	error;
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	trx_t*	parent_trx;
4090
	trx_t*	trx;
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4091
	THD     *thd= current_thd;
4092
	char	norm_name[1000];
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heikki@hundin.mysql.fi committed
4093

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4094
 	DBUG_ENTER("ha_innobase::delete_table");
4095

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4096 4097 4098
	/* Get the transaction associated with the current thd, or create one
	if not yet created */
	
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4099
	parent_trx = check_trx_exists(current_thd);
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4100 4101 4102 4103 4104 4105

	/* 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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4106 4107 4108 4109 4110 4111
	if (lower_case_table_names) {
		srv_lower_case_table_names = TRUE;
	} else {
		srv_lower_case_table_names = FALSE;
	}

4112 4113
	trx = trx_allocate_for_mysql();

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4114 4115
	trx->mysql_thd = current_thd;
	trx->mysql_query_str = &((*current_thd).query);
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	if (thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
		trx->check_foreigns = FALSE;
	}

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

4125 4126 4127
	name_len = strlen(name);

	assert(name_len < 1000);
4128

4129 4130
	/* Strangely, MySQL passes the table name without the '.frm'
	extension, in contrast to ::create */
4131

4132 4133
	normalize_table_name(norm_name, name);

4134
  	/* Drop the table in InnoDB */
4135

4136
	error = row_drop_table_for_mysql(norm_name, trx,
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monty@mishka.local committed
4137
		thd->lex->sql_command == SQLCOM_DROP_DB);
4138

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Merge  
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4139 4140 4141
	/* 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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4142

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4143
	log_buffer_flush_to_disk();
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Merge  
monty@donna.mysql.fi committed
4144

4145
	/* Tell the InnoDB server that there might be work for
4146 4147 4148 4149
	utility threads: */

	srv_active_wake_master_thread();

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4150
  	innobase_commit_low(trx);
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4151

4152 4153
  	trx_free_for_mysql(trx);

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4154
	error = convert_error_code_to_mysql(error, NULL);
4155 4156 4157 4158

	DBUG_RETURN(error);
}

4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171
/*********************************************************************
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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4172
	trx_t*	parent_trx;
4173 4174 4175
	trx_t*	trx;
	char*	ptr;
	int	error;
4176
	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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4181
	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);	

4188
	ptr = strend(path) - 2;
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4189

4190 4191 4192 4193 4194 4195
	while (ptr >= path && *ptr != '\\' && *ptr != '/') {
		ptr--;
		len++;
	}

	ptr++;
4196
	namebuf = my_malloc(len + 2, MYF(0));
4197 4198 4199 4200

	memcpy(namebuf, ptr, len);
	namebuf[len] = '/';
	namebuf[len + 1] = '\0';
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4201
#ifdef  __WIN__
4202
	innobase_casedn_str(namebuf);
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4203
#endif
4204
	trx = trx_allocate_for_mysql();
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4205 4206
	trx->mysql_thd = current_thd;
	trx->mysql_query_str = &((*current_thd).query);
4207

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4208 4209 4210 4211
	if (current_thd->options & OPTION_NO_FOREIGN_KEY_CHECKS) {
		trx->check_foreigns = FALSE;
	}

4212
  	error = row_drop_database_for_mysql(namebuf, trx);
4213
	my_free(namebuf, MYF(0));
4214

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Merge  
monty@donna.mysql.fi committed
4215 4216 4217
	/* 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
4218

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heikki@hundin.mysql.fi committed
4219
	log_buffer_flush_to_disk();
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Merge  
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4220

4221 4222 4223 4224 4225
	/* Tell the InnoDB server that there might be work for
	utility threads: */

	srv_active_wake_master_thread();

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  	innobase_commit_low(trx);
4227 4228
  	trx_free_for_mysql(trx);

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4229
	error = convert_error_code_to_mysql(error, NULL);
4230 4231 4232 4233

	return(error);
}

4234
/*************************************************************************
4235
Renames an InnoDB table. */
4236 4237 4238 4239 4240 4241 4242 4243 4244 4245 4246

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;
4248
	trx_t*	trx;
4249 4250
	char	norm_from[1000];
	char	norm_to[1000];
4251

4252 4253
  	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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4257
	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;
	}

4270
	trx = trx_allocate_for_mysql();
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	trx->mysql_thd = current_thd;
	trx->mysql_query_str = &((*current_thd).query);
4273 4274 4275 4276 4277 4278

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

	assert(name_len1 < 1000);
	assert(name_len2 < 1000);
4279

4280 4281 4282
	normalize_table_name(norm_from, from);
	normalize_table_name(norm_to, to);

4283
  	/* Rename the table in InnoDB */
4284

4285
  	error = row_rename_table_for_mysql(norm_from, norm_to, trx);
4286

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Merge  
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4287 4288 4289
	/* 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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4290

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4291
	log_buffer_flush_to_disk();
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Merge  
monty@donna.mysql.fi committed
4292

4293
	/* Tell the InnoDB server that there might be work for
4294 4295 4296 4297
	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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4301
	error = convert_error_code_to_mysql(error, NULL);
4302 4303 4304 4305 4306 4307 4308 4309 4310 4311

	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 */
4314 4315 4316 4317 4318
	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 */
4319 4320 4321 4322
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
	KEY*		key;
	dict_index_t*	index;
4323
	mysql_byte*	key_val_buff2 	= (mysql_byte*) my_malloc(
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						  table->reclength
      						+ table->max_key_length + 100,
4326
								MYF(MY_WME));
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4327 4328
	ulint		buff2_len = table->reclength
      						+ table->max_key_length + 100;
4329
	dtuple_t*	range_start;
4330
	dtuple_t*	range_end;
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4331
	ib_longlong	n_rows;
4332 4333
	ulint		mode1;
	ulint		mode2;
4334 4335
	void*           heap1;
	void*           heap2;
4336

4337
   	DBUG_ENTER("records_in_range");
4338

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4339 4340
	prebuilt->trx->op_info = (char*)"estimating records in index range";

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4341 4342 4343 4344
	/* 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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4345

4346 4347 4348
	active_index = keynr;

	key = table->key_info + active_index;
4349

4350
	index = dict_table_get_index_noninline(prebuilt->table, key->name);
4351

4352
	range_start = dtuple_create_for_mysql(&heap1, key->key_parts);
4353
 	dict_index_copy_types(range_start, index, key->key_parts);
4354

4355
	range_end = dtuple_create_for_mysql(&heap2, key->key_parts);
4356
 	dict_index_copy_types(range_end, index, key->key_parts);
4357

4358
	row_sel_convert_mysql_key_to_innobase(
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4359 4360 4361
				range_start, (byte*) key_val_buff,
				(ulint)upd_and_key_val_buff_len,
				index,
4362 4363
				(byte*) (min_key ? min_key->key :
                                         (const mysql_byte*) 0),
4364 4365
				(ulint) (min_key ? min_key->length : 0),
				prebuilt->trx);
4366

4367
	row_sel_convert_mysql_key_to_innobase(
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4368 4369
				range_end, (byte*) key_val_buff2,
				buff2_len, index,
4370 4371
				(byte*) (max_key ? max_key->key :
                                         (const mysql_byte*) 0),
4372 4373
				(ulint) (max_key ? max_key->length : 0),
				prebuilt->trx);
4374 4375 4376 4377 4378

	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);
4379

4380
	n_rows = btr_estimate_n_rows_in_range(index, range_start,
4381
						mode1, range_end, mode2);
4382 4383
	dtuple_free_for_mysql(heap1);
	dtuple_free_for_mysql(heap2);
4384

4385 4386
    	my_free((char*) key_val_buff2, MYF(0));

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4387 4388
	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;
	}

4399 4400 4401
	DBUG_RETURN((ha_rows) n_rows);
}

4402 4403
/*************************************************************************
Gives an UPPER BOUND to the number of rows in a table. This is used in
4404
filesort.cc. */
4405 4406

ha_rows
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4407
ha_innobase::estimate_rows_upper_bound(void)
4408
/*======================================*/
4409
			/* out: upper bound of rows */
4410 4411
{
	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
4412 4413
	dict_index_t*	index;
	ulonglong	estimate;
4414
	ulonglong	local_data_file_length;
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4415

sergefp@mysql.com's avatar
sergefp@mysql.com committed
4416
 	DBUG_ENTER("estimate_rows_upper_bound");
4417

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4418 4419 4420 4421 4422 4423
	/* 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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4424 4425 4426
	prebuilt->trx->op_info = (char*)
	                         "calculating upper bound for table rows";

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4427 4428 4429 4430
	/* 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);
4431

4432
	index = dict_table_get_first_index_noninline(prebuilt->table);
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4433

4434
	local_data_file_length = ((ulonglong) index->stat_n_leaf_pages)
4435
    							* UNIV_PAGE_SIZE;
4436

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4437 4438
	/* Calculate a minimum length for a clustered index record and from
	that an upper bound for the number of rows. Since we only calculate
4439 4440
	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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4441

4442 4443
	estimate = 2 * local_data_file_length /
					 dict_index_calc_min_rec_len(index);
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monty@hundin.mysql.fi committed
4444

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4445 4446
	prebuilt->trx->op_info = (char*)"";

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4447
	DBUG_RETURN((ha_rows) estimate);
4448 4449
}

4450 4451 4452 4453 4454 4455 4456 4457 4458 4459 4460 4461
/*************************************************************************
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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4462 4463 4464 4465 4466 4467
	/* 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));
4468 4469
}

4470 4471 4472
/**********************************************************************
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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4473

4474 4475 4476 4477 4478 4479 4480
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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4481
{
4482 4483 4484 4485 4486 4487 4488 4489 4490 4491 4492 4493
	ha_rows total_rows;
	double  time_for_scan;
  
	if (index != table->primary_key)
	  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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heikki@hundin.mysql.fi committed
4494
	time_for_scan = scan_time();
4495

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4496
	if ((total_rows = estimate_rows_upper_bound()) < rows)
4497 4498 4499
	  return time_for_scan;

	return (ranges + (double) rows / (double) total_rows * time_for_scan);
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4500 4501
}

4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513
/*************************************************************************
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;
4514
	ha_rows		rec_per_key;
4515 4516
	ulong		j;
	ulong		i;
4517 4518
	char		path[FN_REFLEN];
	os_file_stat_t  stat_info;
4519

4520 4521
 	DBUG_ENTER("info");

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4522 4523 4524 4525 4526 4527
        /* 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) {

4528
                DBUG_VOID_RETURN;
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4529 4530
        }

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4531 4532 4533 4534 4535 4536 4537 4538 4539
	/* 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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4540 4541
	prebuilt->trx->op_info = (char*)"returning various info to MySQL";

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4542
	trx_search_latch_release_if_reserved(prebuilt->trx);
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4543

4544 4545 4546 4547 4548 4549
 	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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4550 4551
	        prebuilt->trx->op_info = (char*)"updating table statistics";

4552
 		dict_update_statistics(ib_table);
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4553 4554 4555

		prebuilt->trx->op_info = (char*)
		                          "returning various info to MySQL";
4556 4557 4558 4559 4560 4561 4562 4563 4564 4565 4566 4567 4568 4569

		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);
		}

4570 4571 4572
		/* Note that we do not know the access time of the table, 
		nor the CHECK TABLE time, nor the UPDATE or INSERT time. */

4573 4574 4575
		if (os_file_get_status(path,&stat_info)) {
			create_time = stat_info.ctime;
		}
4576 4577 4578
 	}

	if (flag & HA_STATUS_VARIABLE) {
4579
    		records = (ha_rows)ib_table->stat_n_rows;
4580 4581 4582 4583 4584 4585 4586 4587 4588 4589 4590 4591 4592
    		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 {
4593
    			mean_rec_length = (ulong) (data_file_length / records);
4594 4595 4596 4597 4598 4599 4600 4601 4602
    		}
    	}

	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);
		}
4603

4604
		for (i = 0; i < table->keys; i++) {
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4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615
			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;
			}

4616 4617
			for (j = 0; j < table->key_info[i].key_parts; j++) {

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4618 4619 4620 4621 4622 4623 4624 4625
				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,
4626 4627
						ib_table->name,
						(unsigned long) index->n_uniq,
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4628 4629 4630 4631
						j + 1);
				        break;
				}

4632 4633 4634 4635
				if (index->stat_n_diff_key_vals[j + 1] == 0) {

					rec_per_key = records;
				} else {
4636
					rec_per_key = (ha_rows)(records /
4637 4638 4639
   				         index->stat_n_diff_key_vals[j + 1]);
				}

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4640 4641 4642 4643 4644 4645 4646
				/* 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;

4647 4648 4649
				if (rec_per_key == 0) {
					rec_per_key = 1;
				}
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monty@hundin.mysql.fi committed
4650

4651 4652 4653
 				table->key_info[i].rec_per_key[j]=
				  rec_per_key >= ~(ulong) 0 ? ~(ulong) 0 :
				  rec_per_key;
4654
			}
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monty@hundin.mysql.fi committed
4655

4656
			index = dict_table_get_next_index_noninline(index);
4657 4658
		}
	}
4659 4660

  	if (flag & HA_STATUS_ERRKEY) {
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heikki@donna.mysql.fi committed
4661 4662
		ut_a(prebuilt->trx && prebuilt->trx->magic_n == TRX_MAGIC_N);

4663
		errkey = (unsigned int) row_get_mysql_key_number_for_index(
4664 4665
				       (dict_index_t*)
				       trx_get_error_info(prebuilt->trx));
4666 4667
  	}

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heikki@hundin.mysql.fi committed
4668 4669
	prebuilt->trx->op_info = (char*)"";

4670 4671 4672
  	DBUG_VOID_RETURN;
}

4673
/**************************************************************************
heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
4674 4675
Updates index cardinalities of the table, based on 8 random dives into
each index tree. This does NOT calculate exact statistics on the table. */
4676 4677 4678 4679 4680 4681 4682 4683 4684 4685 4686 4687 4688 4689

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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heikki@hundin.mysql.fi committed
4690
/**************************************************************************
4691 4692
This is mapped to "ALTER TABLE tablename TYPE=InnoDB", which rebuilds
the table in MySQL. */
4693

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4694 4695 4696 4697 4698
int
ha_innobase::optimize(
/*==================*/
	THD*		thd,		/* in: connection thread handle */
	HA_CHECK_OPT*	check_opt)	/* in: currently ignored */
4699
{
4700
        return(HA_ADMIN_TRY_ALTER);
4701 4702
}

4703 4704 4705 4706 4707 4708 4709 4710 4711 4712 4713 4714 4715 4716 4717 4718
/***********************************************************************
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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4719

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4720
	ut_a(prebuilt->trx && prebuilt->trx->magic_n == TRX_MAGIC_N);
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heikki@hundin.mysql.fi committed
4721 4722
	ut_a(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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4723

4724 4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 4735
	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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4736

4737 4738 4739
  	return(HA_ADMIN_CORRUPT); 
}

4740
/*****************************************************************
monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
4741 4742 4743
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. */
4744 4745 4746 4747

char*
ha_innobase::update_table_comment(
/*==============================*/
monty@donna.mysql.fi's avatar
Merge  
monty@donna.mysql.fi committed
4748 4749 4750
				/* out: table comment + InnoDB free space +
				info on foreign keys */
        const char*	comment)/* in: table comment defined by user */
4751
{
4752 4753 4754
	uint	length			= strlen(comment);
	char*				str;
	row_prebuilt_t*	prebuilt	= (row_prebuilt_t*)innobase_prebuilt;
4755

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4756 4757 4758 4759
	/* 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. */

4760 4761 4762 4763
	if(length > 64000 - 3) {
		return((char*)comment); /* string too long */
	}

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heikki@hundin.mysql.fi committed
4764 4765
	update_thd(current_thd);

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4766 4767
	prebuilt->trx->op_info = (char*)"returning table comment";

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4768 4769 4770 4771
	/* 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);
4772
	str = NULL;
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4773

4774
	if (FILE* file = os_file_create_tmpfile()) {
4775
		long	flen;
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Merge  
monty@donna.mysql.fi committed
4776

4777 4778
		/* output the data to a temporary file */
		fprintf(file, "InnoDB free: %lu kB",
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4779 4780
      		   (ulong) fsp_get_available_space_in_free_extents(
      					prebuilt->table->space));
4781

4782 4783
		dict_print_info_on_foreign_keys(FALSE, file,
				prebuilt->trx, prebuilt->table);
4784 4785 4786 4787
		flen = ftell(file);
		if(length + flen + 3 > 64000) {
			flen = 64000 - 3 - length;
		}
4788

4789
		ut_ad(flen > 0);
4790

4791 4792
		/* allocate buffer for the full string, and
		read the contents of the temporary file */
4793

4794
		str = my_malloc(length + flen + 3, MYF(0));
4795

4796 4797 4798 4799 4800 4801 4802 4803 4804 4805 4806 4807 4808
		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);
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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()) {
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		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));
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	}
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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);
  }
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  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) {
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		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:
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	        	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);
}

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/**********************************************************************
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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;
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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 (!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(),
			2) ::external_lock(), and
			3) ::init_table_handle_for_HANDLER(). */

			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 */
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	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(
/*=======================*/
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			        /* 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);

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 	if (prebuilt->table->ibd_file_missing && !current_thd->tablespace_op) {
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	        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"
"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",
				prebuilt->table->name);
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		DBUG_RETURN(HA_ERR_CRASHED);
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	}

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	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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5263 5264 5265 5266

			prebuilt->select_lock_type = LOCK_S;
		}

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heikki@donna.mysql.fi committed
5267
		if (prebuilt->select_lock_type != LOCK_NONE) {
5268
			if (thd->in_lock_tables &&
5269
			    thd->variables.innodb_table_locks) {
5270
				ulint	error;
5271 5272
				error = row_lock_table_for_mysql(prebuilt,
							NULL, LOCK_TABLE_EXP);
5273 5274 5275 5276 5277 5278 5279

				if (error != DB_SUCCESS) {
					error = convert_error_code_to_mysql(
						error, user_thd);
					DBUG_RETURN(error);
				}
			}
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5280 5281 5282 5283

		  	trx->mysql_n_tables_locked++;
		}

5284
		DBUG_RETURN(0);
5285
	}
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heikki@donna.mysql.fi committed
5286

5287
	/* MySQL is releasing a table lock */
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heikki@donna.mysql.fi committed
5288

5289 5290 5291
	trx->n_mysql_tables_in_use--;
	prebuilt->mysql_has_locked = FALSE;
	auto_inc_counter_for_this_stat = 0;
5292 5293
	if (trx->n_lock_table_exp) {
		row_unlock_tables_for_mysql(trx);
5294
	}
5295

5296 5297
	/* If the MySQL lock count drops to zero we know that the current SQL
	statement has ended */
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heikki@donna.mysql.fi committed
5298

5299
	if (trx->n_mysql_tables_in_use == 0) {
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heikki@donna.mysql.fi committed
5300

5301 5302 5303
	        trx->mysql_n_tables_locked = 0;
		prebuilt->used_in_HANDLER = FALSE;
			
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heikki@hundin.mysql.fi committed
5304 5305 5306 5307
		/* 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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heikki@hundin.mysql.fi committed
5308
		innobase_release_stat_resources(trx);
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heikki@hundin.mysql.fi committed
5309

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heikki@hundin.mysql.fi committed
5310
		if (!(thd->options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))) {
5311 5312 5313 5314
			if (thd->transaction.all.innodb_active_trans != 0) {
		    	        innobase_commit(thd, trx);
			}
		} else {
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5315 5316 5317
			if (trx->isolation_level <= TRX_ISO_READ_COMMITTED
	    						&& trx->read_view) {

5318
				/* At low transaction isolation levels we let
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5319 5320
				each consistent read set its own snapshot */

5321
				read_view_close_for_mysql(trx);
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5322
			}
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5323 5324 5325
		}
	}

5326
	DBUG_RETURN(0);
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5327 5328
}

5329 5330 5331 5332 5333 5334 5335 5336 5337 5338 5339
/****************************************************************************
Here we export InnoDB status variables to MySQL.  */

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


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5340
/****************************************************************************
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5341
Implements the SHOW INNODB STATUS command. Sends the output of the InnoDB
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5342 5343
Monitor to the client. */

5344
bool
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5345 5346 5347 5348
innodb_show_status(
/*===============*/
	THD*	thd)	/* in: the MySQL query thread of the caller */
{
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5349
        Protocol        *protocol= thd->protocol;
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5350
	trx_t*		trx;
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5351

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5352 5353
        DBUG_ENTER("innodb_show_status");

5354
        if (have_innodb != SHOW_OPTION_YES) {
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5355 5356 5357
                my_message(ER_NOT_SUPPORTED_YET,
          "Cannot call SHOW INNODB STATUS because skip-innodb is defined",
                           MYF(0));
5358
                DBUG_RETURN(TRUE);
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5359
        }
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heikki@hundin.mysql.fi committed
5360

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5361 5362 5363 5364
	trx = check_trx_exists(thd);

	innobase_release_stat_resources(trx);

5365
	/* We let the InnoDB Monitor to output at most 64000 bytes of text. */
5366

5367 5368
	long	flen;
	char*	str;
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5369

5370
	mutex_enter_noninline(&srv_monitor_file_mutex);
5371 5372 5373
	rewind(srv_monitor_file);
	srv_printf_innodb_monitor(srv_monitor_file);
	flen = ftell(srv_monitor_file);
5374
	os_file_set_eof(srv_monitor_file);
5375 5376 5377
	if(flen > 64000 - 1) {
		flen = 64000 - 1;
	}
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5378

5379
	ut_ad(flen > 0);
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5380

5381 5382
	/* allocate buffer for the string, and
	read the contents of the temporary file */
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heikki@hundin.mysql.fi committed
5383

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monty@mishka.local committed
5384
	if (!(str = my_malloc(flen + 1, MYF(0))))
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heikki@hundin.mysql.fi committed
5385
        {
monty@mishka.local's avatar
monty@mishka.local committed
5386
          mutex_exit_noninline(&srv_monitor_file_mutex);
5387
          DBUG_RETURN(TRUE);
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heikki@hundin.mysql.fi committed
5388
        }
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heikki@hundin.mysql.fi committed
5389

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monty@mishka.local committed
5390 5391
	rewind(srv_monitor_file);
	flen = fread(str, 1, flen, srv_monitor_file);
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5392

5393
	mutex_exit_noninline(&srv_monitor_file_mutex);
5394

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5395 5396
	List<Item> field_list;

5397
	field_list.push_back(new Item_empty_string("Status", flen));
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5398

5399 5400
	if (protocol->send_fields(&field_list, Protocol::SEND_NUM_ROWS |
                                               Protocol::SEND_EOF)) {
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heikki@hundin.mysql.fi committed
5401

5402
		my_free(str, MYF(0));
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heikki@hundin.mysql.fi committed
5403

5404
		DBUG_RETURN(TRUE);
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heikki@hundin.mysql.fi committed
5405 5406
	}

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monty@mishka.local committed
5407 5408 5409
        protocol->prepare_for_resend();
        protocol->store(str, flen, system_charset_info);
        my_free(str, MYF(0));
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5410 5411

        if (protocol->write())
5412
          DBUG_RETURN(TRUE);
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heikki@hundin.mysql.fi committed
5413

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monty@mishka.local committed
5414
	send_eof(thd);
5415
  	DBUG_RETURN(FALSE);
heikki@hundin.mysql.fi's avatar
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5416 5417
}

5418 5419 5420 5421 5422
/****************************************************************************
 Handling the shared INNOBASE_SHARE structure that is needed to provide table
 locking.
****************************************************************************/

5423
static mysql_byte* innobase_get_key(INNOBASE_SHARE *share,uint *length,
5424 5425 5426
			      my_bool not_used __attribute__((unused)))
{
  *length=share->table_name_length;
5427
  return (mysql_byte*) share->table_name;
5428 5429 5430 5431 5432 5433 5434
}

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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monty@donna.mysql.com committed
5435
  if (!(share=(INNOBASE_SHARE*) hash_search(&innobase_open_tables,
5436
					(mysql_byte*) table_name,
5437 5438 5439 5440 5441 5442 5443 5444
					    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);
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
5445
      if (my_hash_insert(&innobase_open_tables, (mysql_byte*) share))
5446 5447 5448 5449 5450 5451
      {
	pthread_mutex_unlock(&innobase_mutex);
	my_free((gptr) share,0);
	return 0;
      }
      thr_lock_init(&share->lock);
5452
      pthread_mutex_init(&share->mutex,MY_MUTEX_INIT_FAST);
5453 5454 5455 5456 5457 5458 5459 5460 5461 5462 5463 5464
    }
  }
  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)
  {
5465
    hash_delete(&innobase_open_tables, (mysql_byte*) share);
5466 5467 5468 5469 5470 5471
    thr_lock_delete(&share->lock);
    pthread_mutex_destroy(&share->mutex);
    my_free((gptr) share, MYF(0));
  }
  pthread_mutex_unlock(&innobase_mutex);
}
5472 5473

/*********************************************************************
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5474
Converts a MySQL table lock stored in the 'lock' field of the handle to
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5475 5476 5477 5478 5479 5480
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. */
5481 5482 5483 5484 5485 5486 5487 5488 5489 5490 5491 5492 5493 5494 5495 5496 5497

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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5498 5499 5500
	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 ||
5501
	    lock_type == TL_READ_NO_INSERT) {
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heikki@hundin.mysql.fi committed
5502 5503 5504 5505 5506
		/* 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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5507
		INSERT INTO ... SELECT ... and the logical logging (MySQL
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heikki@hundin.mysql.fi committed
5508 5509
		binlog) requires the use of a locking read, or
		MySQL is doing LOCK TABLES ... READ. */
5510

5511
		prebuilt->select_lock_type = LOCK_S;
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5512 5513
		prebuilt->stored_select_lock_type = LOCK_S;

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5514 5515 5516 5517 5518 5519 5520
	} 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
5521
		here even if this would be SELECT ... FOR UPDATE */
5522

5523
		prebuilt->select_lock_type = LOCK_NONE;
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heikki@hundin.mysql.fi committed
5524
		prebuilt->stored_select_lock_type = LOCK_NONE;
5525 5526 5527 5528
	}

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

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5529 5530
    		/* If we are not doing a LOCK TABLE or DISCARD/IMPORT
		TABLESPACE, then allow multiple writers */
5531 5532

    		if ((lock_type >= TL_WRITE_CONCURRENT_INSERT &&
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heikki@hundin.mysql.fi committed
5533 5534
	 	    lock_type <= TL_WRITE) && !thd->in_lock_tables
		    && !thd->tablespace_op) {
5535 5536 5537 5538

      			lock_type = TL_WRITE_ALLOW_WRITE;
      		}

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5539 5540 5541 5542 5543 5544 5545 5546 5547 5548
		/* 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;
		}
		
5549 5550 5551 5552
 		lock.type=lock_type;
  	}

  	*to++= &lock;
5553

5554 5555 5556
	return(to);
}

5557
/***********************************************************************
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5558 5559
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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heikki@hundin.mysql.fi committed
5560
counter if it already has been initialized. In paramete ret returns
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5561
the value of the auto-inc counter. */
5562

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5563 5564 5565 5566 5567 5568
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 */
5569
{
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5570
  	row_prebuilt_t* prebuilt	= (row_prebuilt_t*) innobase_prebuilt;
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5571
    	longlong        auto_inc;
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5572
  	int     	error;
5573

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heikki@hundin.mysql.fi committed
5574
  	ut_a(prebuilt);
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5575 5576
	ut_a(prebuilt->trx ==
		(trx_t*) current_thd->transaction.all.innobase_tid);
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5577 5578
	ut_a(prebuilt->table);
	
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5579 5580 5581 5582 5583
	/* 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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heikki@hundin.mysql.fi committed
5584
	auto_inc = dict_table_autoinc_read(prebuilt->table);
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heikki@hundin.mysql.fi committed
5585

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heikki@hundin.mysql.fi committed
5586 5587 5588 5589 5590 5591
	if (auto_inc != 0) {
		/* Already initialized */
		*ret = auto_inc;
	
		return(0);
	}
5592

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
5593
	error = row_lock_table_autoinc_for_mysql(prebuilt);
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heikki@hundin.mysql.fi committed
5594

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heikki@hundin.mysql.fi committed
5595 5596
	if (error != DB_SUCCESS) {
		error = convert_error_code_to_mysql(error, user_thd);
5597

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heikki@hundin.mysql.fi committed
5598 5599
		goto func_exit;
	}	
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monty@hundin.mysql.fi committed
5600

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heikki@hundin.mysql.fi committed
5601 5602
	/* Check again if someone has initialized the counter meanwhile */
	auto_inc = dict_table_autoinc_read(prebuilt->table);
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5603

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heikki@hundin.mysql.fi committed
5604 5605 5606 5607
	if (auto_inc != 0) {
		*ret = auto_inc;
	
		return(0);
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heikki@hundin.mysql.fi committed
5608
	}
5609

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5610 5611 5612 5613 5614 5615 5616 5617 5618
  	(void) extra(HA_EXTRA_KEYREAD);
  	index_init(table->next_number_index);

	/* 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. */
5619

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5620
  	prebuilt->select_lock_type = LOCK_X;
5621

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5622 5623 5624
  	/* Play safe and also give in another way the hint to fetch
  	all columns in the key: */
  	
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heikki@hundin.mysql.fi committed
5625
	prebuilt->hint_need_to_fetch_extra_cols = ROW_RETRIEVE_ALL_COLS;
5626

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heikki@hundin.mysql.fi committed
5627
	prebuilt->trx->mysql_n_tables_locked += 1;
5628
  
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heikki@hundin.mysql.fi committed
5629
	error = index_last(table->record[1]);
5630

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heikki@hundin.mysql.fi committed
5631
  	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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5643
  	} else {
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5644 5645
		/* Initialize to max(col) + 1 */
    		auto_inc = (longlong) table->next_number_field->
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heikki@hundin.mysql.fi committed
5646 5647
                        	val_int_offset(table->rec_buff_length) + 1;
  	}
5648

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5649 5650 5651
	dict_table_autoinc_initialize(prebuilt->table, auto_inc);

func_exit:
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heikki@hundin.mysql.fi committed
5652
  	(void) extra(HA_EXTRA_NO_KEYREAD);
5653

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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. */

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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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	}
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	return((ulonglong) nr);
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}

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/***********************************************************************
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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 */
	KEY_PART_INFO *key_part= table->key_info[table->primary_key].key_part;
	KEY_PART_INFO *key_part_end= 
	  key_part + table->key_info[table->primary_key].key_parts;
	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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}

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extern "C" {
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/**********************************************************************
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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! */
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ulint
innobase_get_at_most_n_mbchars(
/*===========================*/
				/* out: number of bytes occupied by the first
				n characters */
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	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 */
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{
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	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 */
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	charset = get_charset(charset_id, MYF(MY_WME));
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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. */
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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;
		}
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	}
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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 */