sql_class.cc 86 KB
Newer Older
1
/* Copyright (C) 2000-2006 MySQL AB
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
2

bk@work.mysql.com's avatar
bk@work.mysql.com committed
3 4
   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
5
   the Free Software Foundation; version 2 of the License.
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
6

bk@work.mysql.com's avatar
bk@work.mysql.com committed
7 8 9 10
   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.
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
11

bk@work.mysql.com's avatar
bk@work.mysql.com committed
12 13 14 15 16 17 18 19 20 21 22 23
   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 */


/*****************************************************************************
**
** This file implements classes defined in sql_class.h
** Especially the classes to handle a result from a select
**
*****************************************************************************/

24
#ifdef USE_PRAGMA_IMPLEMENTATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
25 26 27 28
#pragma implementation				// gcc: Class implementation
#endif

#include "mysql_priv.h"
29
#include "rpl_rli.h"
30
#include "rpl_record.h"
31 32
#include <my_bitmap.h>
#include "log_event.h"
bk@work.mysql.com's avatar
bk@work.mysql.com committed
33 34
#include <m_ctype.h>
#include <sys/stat.h>
35
#include <thr_alarm.h>
bk@work.mysql.com's avatar
bk@work.mysql.com committed
36 37 38
#ifdef	__WIN__
#include <io.h>
#endif
39
#include <mysys_err.h>
bk@work.mysql.com's avatar
bk@work.mysql.com committed
40

monty@mysql.com's avatar
monty@mysql.com committed
41 42
#include "sp_rcontext.h"
#include "sp_cache.h"
43

44 45 46 47 48
/*
  The following is used to initialise Table_ident with a internal
  table name
*/
char internal_table_name[2]= "*";
49
char empty_c_string[1]= {0};    /* used for not defined db */
50

51 52
const char * const THD::DEFAULT_WHERE= "field list";

53

bk@work.mysql.com's avatar
bk@work.mysql.com committed
54 55 56 57
/*****************************************************************************
** Instansiate templates
*****************************************************************************/

58
#ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
bk@work.mysql.com's avatar
bk@work.mysql.com committed
59 60 61 62 63 64 65 66 67 68 69 70 71 72 73
/* Used templates */
template class List<Key>;
template class List_iterator<Key>;
template class List<key_part_spec>;
template class List_iterator<key_part_spec>;
template class List<Alter_drop>;
template class List_iterator<Alter_drop>;
template class List<Alter_column>;
template class List_iterator<Alter_column>;
#endif

/****************************************************************************
** User variables
****************************************************************************/

74 75
extern "C" byte *get_var_key(user_var_entry *entry, uint *length,
			     my_bool not_used __attribute__((unused)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
76 77 78 79 80
{
  *length=(uint) entry->name.length;
  return (byte*) entry->name.str;
}

81
extern "C" void free_user_var(user_var_entry *entry)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
82 83 84 85 86 87 88
{
  char *pos= (char*) entry+ALIGN_SIZE(sizeof(*entry));
  if (entry->value && entry->value != pos)
    my_free(entry->value, MYF(0));
  my_free((char*) entry,MYF(0));
}

89 90 91 92 93
bool key_part_spec::operator==(const key_part_spec& other) const
{
  return length == other.length && !strcmp(field_name, other.field_name);
}

94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127
/**
  Construct an (almost) deep copy of this key. Only those
  elements that are known to never change are not copied.
  If out of memory, a partial copy is returned and an error is set
  in THD.
*/

Key::Key(const Key &rhs, MEM_ROOT *mem_root)
  :type(rhs.type),
  key_create_info(rhs.key_create_info),
  columns(rhs.columns, mem_root),
  name(rhs.name),
  generated(rhs.generated)
{
  list_copy_and_replace_each_value(columns, mem_root);
}

/**
  Construct an (almost) deep copy of this foreign key. Only those
  elements that are known to never change are not copied.
  If out of memory, a partial copy is returned and an error is set
  in THD.
*/

foreign_key::foreign_key(const foreign_key &rhs, MEM_ROOT *mem_root)
  :Key(rhs),
  ref_table(rhs.ref_table),
  ref_columns(rhs.ref_columns),
  delete_opt(rhs.delete_opt),
  update_opt(rhs.update_opt),
  match_opt(rhs.match_opt)
{
  list_copy_and_replace_each_value(ref_columns, mem_root);
}
128 129

/*
130
  Test if a foreign key (= generated key) is a prefix of the given key
131 132 133 134 135 136 137 138 139 140 141 142 143 144
  (ignoring key name, key type and order of columns)

  NOTES:
    This is only used to test if an index for a FOREIGN KEY exists

  IMPLEMENTATION
    We only compare field names

  RETURN
    0	Generated key is a prefix of other key
    1	Not equal
*/

bool foreign_key_prefix(Key *a, Key *b)
145
{
146 147 148 149
  /* Ensure that 'a' is the generated key */
  if (a->generated)
  {
    if (b->generated && a->columns.elements > b->columns.elements)
150
      swap_variables(Key*, a, b);               // Put shorter key in 'a'
151 152
  }
  else
153
  {
154 155
    if (!b->generated)
      return TRUE;                              // No foreign key
156
    swap_variables(Key*, a, b);                 // Put generated key in 'a'
157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172
  }

  /* Test if 'a' is a prefix of 'b' */
  if (a->columns.elements > b->columns.elements)
    return TRUE;                                // Can't be prefix

  List_iterator<key_part_spec> col_it1(a->columns);
  List_iterator<key_part_spec> col_it2(b->columns);
  const key_part_spec *col1, *col2;

#ifdef ENABLE_WHEN_INNODB_CAN_HANDLE_SWAPED_FOREIGN_KEY_COLUMNS
  while ((col1= col_it1++))
  {
    bool found= 0;
    col_it2.rewind();
    while ((col2= col_it2++))
173
    {
174 175 176 177 178
      if (*col1 == *col2)
      {
        found= TRUE;
	break;
      }
179
    }
180 181 182 183 184 185 186 187 188 189
    if (!found)
      return TRUE;                              // Error
  }
  return FALSE;                                 // Is prefix
#else
  while ((col1= col_it1++))
  {
    col2= col_it2++;
    if (!(*col1 == *col2))
      return TRUE;
190
  }
191 192
  return FALSE;                                 // Is prefix
#endif
193 194 195
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
196 197 198
/****************************************************************************
** Thread specific functions
****************************************************************************/
199

200
Open_tables_state::Open_tables_state(ulong version_arg)
201
  :version(version_arg), state_flags(0U)
202 203 204 205
{
  reset_open_tables_state();
}

antony@ppcg5.local's avatar
antony@ppcg5.local committed
206 207 208 209 210
/*
  The following functions form part of the C plugin API
*/

extern "C"
antony@ppcg5.local's avatar
antony@ppcg5.local committed
211
int thd_in_lock_tables(const THD *thd)
212
{
antony@ppcg5.local's avatar
antony@ppcg5.local committed
213
  return test(thd->in_lock_tables);
214 215 216
}


antony@ppcg5.local's avatar
antony@ppcg5.local committed
217
extern "C"
antony@ppcg5.local's avatar
antony@ppcg5.local committed
218
int thd_tablespace_op(const THD *thd)
219
{
antony@ppcg5.local's avatar
antony@ppcg5.local committed
220
  return test(thd->tablespace_op);
221 222 223
}


antony@ppcg5.local's avatar
antony@ppcg5.local committed
224
extern "C"
225 226 227 228 229 230 231
const char *thd_proc_info(THD *thd, const char *info)
{
  const char *old_info= thd->proc_info;
  thd->proc_info= info;
  return old_info;
}

antony@ppcg5.local's avatar
antony@ppcg5.local committed
232
extern "C"
233 234 235 236 237
void **thd_ha_data(const THD *thd, const struct handlerton *hton)
{
  return (void **) thd->ha_data + hton->slot;
}

antony@ppcg5.local's avatar
antony@ppcg5.local committed
238
extern "C"
antony@ppcg5.local's avatar
antony@ppcg5.local committed
239 240 241 242 243
long long thd_test_options(const THD *thd, long long test_options)
{
  return thd->options & test_options;
}

antony@ppcg5.local's avatar
antony@ppcg5.local committed
244
extern "C"
antony@ppcg5.local's avatar
antony@ppcg5.local committed
245 246 247 248 249
int thd_sql_command(const THD *thd)
{
  return (int) thd->lex->sql_command;
}

250 251 252 253 254 255
extern "C"
int thd_tx_isolation(const THD *thd)
{
  return (int) thd->variables.tx_isolation;
}

antony@ppcg5.local's avatar
antony@ppcg5.local committed
256 257 258 259

/*
  Dumps a text description of a thread, its security context
  (user, host) and the current query.
260

antony@ppcg5.local's avatar
antony@ppcg5.local committed
261 262 263 264 265 266
  SYNOPSIS
    thd_security_context()
    thd                 current thread context
    buffer              pointer to preferred result buffer
    length              length of buffer
    max_query_len       how many chars of query to copy (0 for all)
267

antony@ppcg5.local's avatar
antony@ppcg5.local committed
268 269 270
  RETURN VALUES
    pointer to string
*/
antony@ppcg5.local's avatar
antony@ppcg5.local committed
271
extern "C"
serg@janus.mylan's avatar
serg@janus.mylan committed
272 273
char *thd_security_context(THD *thd, char *buffer, unsigned int length,
                           unsigned int max_query_len)
antony@ppcg5.local's avatar
antony@ppcg5.local committed
274 275 276 277 278
{
  String str(buffer, length, &my_charset_latin1);
  const Security_context *sctx= &thd->main_security_ctx;
  char header[64];
  int len;
279 280

  len= my_snprintf(header, sizeof(header),
antony@ppcg5.local's avatar
antony@ppcg5.local committed
281 282 283 284
                   "MySQL thread id %lu, query id %lu",
                   thd->thread_id, (ulong) thd->query_id);
  str.length(0);
  str.append(header, len);
285

antony@ppcg5.local's avatar
antony@ppcg5.local committed
286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322
  if (sctx->host)
  {
    str.append(' ');
    str.append(sctx->host);
  }

  if (sctx->ip)
  {
    str.append(' ');
    str.append(sctx->ip);
  }

  if (sctx->user)
  {
    str.append(' ');
    str.append(sctx->user);
  }

  if (thd->proc_info)
  {
    str.append(' ');
    str.append(thd->proc_info);
  }

  if (thd->query)
  {
    if (max_query_len < 1)
      len= thd->query_length;
    else
      len= min(thd->query_length, max_query_len);
    str.append('\n');
    str.append(thd->query, len);
  }
  if (str.c_ptr_safe() == buffer)
    return buffer;
  return thd->strmake(str.ptr(), str.length());
}
323 324


bk@work.mysql.com's avatar
bk@work.mysql.com committed
325

326
THD::THD()
327 328
   :Statement(&main_lex, &main_mem_root, CONVENTIONAL_EXECUTION,
              /* statement id */ 0),
329
   Open_tables_state(refresh_version), rli_fake(0),
330
   lock_id(&main_lock_id),
331 332
   user_time(0), in_sub_stmt(0),
   binlog_table_maps(0),
333 334 335 336 337
   arg_of_last_insert_id_function(FALSE),
   first_successful_insert_id_in_prev_stmt(0),
   first_successful_insert_id_in_prev_stmt_for_binlog(0),
   first_successful_insert_id_in_cur_stmt(0),
   stmt_depends_on_first_successful_insert_id_in_prev_stmt(FALSE),
serg@janus.mylan's avatar
serg@janus.mylan committed
338 339
   global_read_lock(0),
   is_fatal_error(0),
serg@janus.mylan's avatar
serg@janus.mylan committed
340 341 342 343 344
   rand_used(0),
   time_zone_used(0),
   in_lock_tables(0),
   bootstrap(0),
   derived_tables_processing(FALSE),
345
   spcont(NULL)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
346
{
347 348
  ulong tmp;

349 350 351 352 353 354
  /*
    Pass nominal parameters to init_alloc_root only to ensure that
    the destructor works OK in case of an error. The main_mem_root
    will be re-initialized in init_for_queries().
  */
  init_sql_alloc(&main_mem_root, ALLOC_ROOT_MIN_BLOCK_SIZE, 0);
konstantin@mysql.com's avatar
konstantin@mysql.com committed
355
  stmt_arena= this;
356
  thread_stack= 0;
357
  db= 0;
358
  catalog= (char*)"std"; // the only catalog we have for now
359 360
  main_security_ctx.init();
  security_ctx= &main_security_ctx;
pem@mysql.com's avatar
pem@mysql.com committed
361
  locked=some_tables_deleted=no_errors=password= 0;
konstantin@oak.local's avatar
konstantin@oak.local committed
362
  query_start_used= 0;
363
  count_cuted_fields= CHECK_FIELD_IGNORE;
hf@genie.(none)'s avatar
SCRUM  
hf@genie.(none) committed
364
  killed= NOT_KILLED;
365
  db_length= col_access=0;
366
  query_error= tmp_table_used= 0;
367
  hash_clear(&handler_tables_hash);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
368
  tmp_table=0;
369
  used_tables=0;
370
  cuted_fields= sent_row_count= row_count= 0L;
371
  limit_found_rows= 0;
372
  statement_id_counter= 0UL;
373 374 375
#ifdef ERROR_INJECT_SUPPORT
  error_inject_value= 0UL;
#endif
376
  // Must be reset to handle error with THD's created for init of mysqld
konstantin@oak.local's avatar
konstantin@oak.local committed
377
  lex->current_select= 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
378
  start_time=(time_t) 0;
379
  time_after_lock=(time_t) 0;
380
  current_linfo =  0;
381
  slave_thread = 0;
382
  bzero(&variables, sizeof(variables));
383
  thread_id= variables.pseudo_thread_id= 0;
384
  one_shot_set= 0;
385
  file_id = 0;
386
  query_id= 0;
387
  warn_id= 0;
388
  db_charset= global_system_variables.collation_database;
389
  bzero(ha_data, sizeof(ha_data));
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
390
  mysys_var=0;
391
  binlog_evt_union.do_union= FALSE;
392
  enable_slow_log= 0;
393 394
#ifndef DBUG_OFF
  dbug_sentry=THD_SENTRY_MAGIC;
395
#endif
396
#ifndef EMBEDDED_LIBRARY
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
397
  net.vio=0;
398
#endif
399
  client_capabilities= 0;                       // minimalistic client
400
  net.last_error[0]=0;                          // If error on boot
401
#ifdef HAVE_QUERY_CACHE
402
  query_cache_init_query(&net);                 // If error on boot
403
#endif
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
404
  ull=0;
405 406
  system_thread= NON_SYSTEM_THREAD;
  cleanup_done= abort_on_warning= no_warnings_for_error= 0;
407
  peer_port= 0;					// For SHOW PROCESSLIST
408
  transaction.m_pending_rows_event= 0;
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
409 410
#ifdef SIGNAL_WITH_VIO_CLOSE
  active_vio = 0;
411
#endif
412
  pthread_mutex_init(&LOCK_delete, MY_MUTEX_INIT_FAST);
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
413 414 415

  /* Variables with default values */
  proc_info="login";
416
  where= THD::DEFAULT_WHERE;
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
417
  server_id = ::server_id;
418
  slave_net = 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
419
  command=COM_CONNECT;
420
  *scramble= '\0';
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
421

422
  init();
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
423
  /* Initialize sub structures */
424
  init_sql_alloc(&warn_root, WARN_ALLOC_BLOCK_SIZE, WARN_ALLOC_PREALLOC_SIZE);
425
  user_connect=(USER_CONN *)0;
426
  hash_init(&user_vars, system_charset_info, USER_VARS_HASH_SIZE, 0, 0,
bk@work.mysql.com's avatar
bk@work.mysql.com committed
427
	    (hash_get_key) get_var_key,
428
	    (hash_free_key) free_user_var, 0);
429

430 431
  sp_proc_cache= NULL;
  sp_func_cache= NULL;
432

433 434 435
  /* For user vars replication*/
  if (opt_bin_log)
    my_init_dynamic_array(&user_var_events,
436
			  sizeof(BINLOG_USER_VAR_EVENT *), 16, 16);
437 438 439
  else
    bzero((char*) &user_var_events, sizeof(user_var_events));

440
  /* Protocol */
441 442 443
  protocol= &protocol_text;			// Default protocol
  protocol_text.init(this);
  protocol_binary.init(this);
444

heikki@hundin.mysql.fi's avatar
heikki@hundin.mysql.fi committed
445
  tablespace_op=FALSE;
446 447
  tmp= sql_rnd_with_mutex();
  randominit(&rand, tmp + (ulong) &rand, tmp + (ulong) ::global_query_id);
448
  substitute_null_with_insert_id = FALSE;
449 450
  thr_lock_info_init(&lock_info); /* safety: will be reset after start */
  thr_lock_owner_init(&main_lock_id, &lock_info);
451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482

  m_internal_handler= NULL;
}


void THD::push_internal_handler(Internal_error_handler *handler)
{
  /*
    TODO: The current implementation is limited to 1 handler at a time only.
    THD and sp_rcontext need to be modified to use a common handler stack.
  */
  DBUG_ASSERT(m_internal_handler == NULL);
  m_internal_handler= handler;
}


bool THD::handle_error(uint sql_errno,
                       MYSQL_ERROR::enum_warning_level level)
{
  if (m_internal_handler)
  {
    return m_internal_handler->handle_error(sql_errno, level, this);
  }

  return FALSE;                                 // 'FALSE', as per coding style
}


void THD::pop_internal_handler()
{
  DBUG_ASSERT(m_internal_handler != NULL);
  m_internal_handler= NULL;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
483 484
}

485 486 487 488 489 490 491

/*
  Init common variables that has to be reset on start and on change_user
*/

void THD::init(void)
{
492
  pthread_mutex_lock(&LOCK_global_system_variables);
antony@ppcg5.local's avatar
antony@ppcg5.local committed
493
  plugin_thdvar_init(this);
494 495 496 497 498 499
  variables.time_format= date_time_format_copy((THD*) 0,
					       variables.time_format);
  variables.date_format= date_time_format_copy((THD*) 0,
					       variables.date_format);
  variables.datetime_format= date_time_format_copy((THD*) 0,
						   variables.datetime_format);
500
  pthread_mutex_unlock(&LOCK_global_system_variables);
501
  server_status= SERVER_STATUS_AUTOCOMMIT;
502 503
  if (variables.sql_mode & MODE_NO_BACKSLASH_ESCAPES)
    server_status|= SERVER_STATUS_NO_BACKSLASH_ESCAPES;
504
  options= thd_startup_options;
505
  no_trans_update.stmt= no_trans_update.all= FALSE;
506
  open_options=ha_open_options;
507 508 509
  update_lock_default= (variables.low_priority_updates ?
			TL_WRITE_LOW_PRIORITY :
			TL_WRITE);
510
  session_tx_isolation= (enum_tx_isolation) variables.tx_isolation;
511 512 513
  warn_list.empty();
  bzero((char*) warn_count, sizeof(warn_count));
  total_warn_count= 0;
514
  update_charset();
515
  reset_current_stmt_binlog_row_based();
516
  bzero((char *) &status_var, sizeof(status_var));
517 518
}

519

520 521 522 523 524 525 526 527
/*
  Init THD for query processing.
  This has to be called once before we call mysql_parse.
  See also comments in sql_class.h.
*/

void THD::init_for_queries()
{
528
  set_time(); 
529
  ha_enable_transaction(this,TRUE);
530

531
  reset_root_defaults(mem_root, variables.query_alloc_block_size,
532
                      variables.query_prealloc_size);
533
#ifdef USING_TRANSACTIONS
534 535 536
  reset_root_defaults(&transaction.mem_root,
                      variables.trans_alloc_block_size,
                      variables.trans_prealloc_size);
537
#endif
538 539
  transaction.xid_state.xid.null();
  transaction.xid_state.in_thd=1;
540 541 542
}


543 544 545 546 547 548 549 550 551 552 553 554 555 556
/*
  Do what's needed when one invokes change user

  SYNOPSIS
    change_user()

  IMPLEMENTATION
    Reset all resources that are connection specific
*/


void THD::change_user(void)
{
  cleanup();
557
  killed= NOT_KILLED;
558
  cleanup_done= 0;
559
  init();
560
  stmt_map.reset();
561
  hash_init(&user_vars, system_charset_info, USER_VARS_HASH_SIZE, 0, 0,
562
	    (hash_get_key) get_var_key,
563
	    (hash_free_key) free_user_var, 0);
564 565
  sp_cache_clear(&sp_proc_cache);
  sp_cache_clear(&sp_func_cache);
566 567 568
}


monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
569 570 571
/* Do operations that may take a long time */

void THD::cleanup(void)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
572
{
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
573
  DBUG_ENTER("THD::cleanup");
574 575
  DBUG_ASSERT(cleanup_done == 0);

576
  killed= KILL_CONNECTION;
577
#ifdef ENABLE_WHEN_BINLOG_WILL_BE_ABLE_TO_PREPARE
578 579 580 581
  if (transaction.xid_state.xa_state == XA_PREPARED)
  {
#error xid_state in the cache should be replaced by the allocated value
  }
582
#endif
583
  {
serg@serg.mylan's avatar
serg@serg.mylan committed
584
    ha_rollback(this);
585 586
    xid_cache_delete(&transaction.xid_state);
  }
bk@work.mysql.com's avatar
bk@work.mysql.com committed
587 588 589 590 591
  if (locked_tables)
  {
    lock=locked_tables; locked_tables=0;
    close_thread_tables(this);
  }
592
  mysql_ha_flush(this, (TABLE_LIST*) 0,
593
                 MYSQL_HA_CLOSE_FINAL | MYSQL_HA_FLUSH_ALL, FALSE);
594
  hash_free(&handler_tables_hash);
595 596
  delete_dynamic(&user_var_events);
  hash_free(&user_vars);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
597
  close_temporary_tables(this);
598 599 600
  my_free((char*) variables.time_format, MYF(MY_ALLOW_ZERO_PTR));
  my_free((char*) variables.date_format, MYF(MY_ALLOW_ZERO_PTR));
  my_free((char*) variables.datetime_format, MYF(MY_ALLOW_ZERO_PTR));
601
  
602
  sp_cache_clear(&sp_proc_cache);
603 604
  sp_cache_clear(&sp_func_cache);

605 606 607
  if (global_read_lock)
    unlock_global_read_lock(this);
  if (ull)
608
  {
609 610 611
    pthread_mutex_lock(&LOCK_user_locks);
    item_user_lock_release(ull);
    pthread_mutex_unlock(&LOCK_user_locks);
612
  }
613

monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
614 615 616 617
  cleanup_done=1;
  DBUG_VOID_RETURN;
}

618

monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
619 620
THD::~THD()
{
621
  THD_CHECK_SENTRY(this);
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
622
  DBUG_ENTER("~THD()");
623 624 625
  /* Ensure that no one is using THD */
  pthread_mutex_lock(&LOCK_delete);
  pthread_mutex_unlock(&LOCK_delete);
626
  add_to_status(&global_status_var, &status_var);
627

monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
628
  /* Close connection */
serg@serg.mylan's avatar
serg@serg.mylan committed
629
#ifndef EMBEDDED_LIBRARY
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
630 631 632
  if (net.vio)
  {
    vio_delete(net.vio);
serg@serg.mylan's avatar
serg@serg.mylan committed
633
    net_end(&net);
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
634
  }
635
#endif
636
  stmt_map.reset();                     /* close all prepared statements */
637
  DBUG_ASSERT(lock_info.n_cursors == 0);
monty@hundin.mysql.fi's avatar
monty@hundin.mysql.fi committed
638 639
  if (!cleanup_done)
    cleanup();
640

serg@serg.mylan's avatar
serg@serg.mylan committed
641
  ha_close_connection(this);
antony@ppcg5.local's avatar
antony@ppcg5.local committed
642
  plugin_thdvar_cleanup(this);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
643

644 645
  DBUG_PRINT("info", ("freeing security context"));
  main_security_ctx.destroy();
646
  safeFree(db);
647
  free_root(&warn_root,MYF(0));
648
#ifdef USING_TRANSACTIONS
649
  free_root(&transaction.mem_root,MYF(0));
650
#endif
bk@work.mysql.com's avatar
bk@work.mysql.com committed
651
  mysys_var=0;					// Safety (shouldn't be needed)
652
  pthread_mutex_destroy(&LOCK_delete);
653
#ifndef DBUG_OFF
konstantin@oak.local's avatar
konstantin@oak.local committed
654
  dbug_sentry= THD_SENTRY_GONE;
655
#endif  
656 657 658 659 660
#ifndef EMBEDDED_LIBRARY
  if (rli_fake)
    delete rli_fake;
#endif

661
  free_root(&main_mem_root, MYF(0));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
662 663 664
  DBUG_VOID_RETURN;
}

665

666
/*
667 668 669 670 671 672
  Add all status variables to another status variable array

  SYNOPSIS
   add_to_status()
   to_var       add to this array
   from_var     from this array
673 674 675 676 677 678 679 680 681

  NOTES
    This function assumes that all variables are long/ulong.
    If this assumption will change, then we have to explictely add
    the other variables after the while loop
*/

void add_to_status(STATUS_VAR *to_var, STATUS_VAR *from_var)
{
682 683
  ulong *end= (ulong*) ((byte*) to_var +
                        offsetof(STATUS_VAR, last_system_status_var) +
684 685 686 687 688 689 690
			sizeof(ulong));
  ulong *to= (ulong*) to_var, *from= (ulong*) from_var;

  while (to != end)
    *(to++)+= *(from++);
}

691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715
/*
  Add the difference between two status variable arrays to another one.

  SYNOPSIS
    add_diff_to_status
    to_var       add to this array
    from_var     from this array
    dec_var      minus this array
  
  NOTE
    This function assumes that all variables are long/ulong.
*/

void add_diff_to_status(STATUS_VAR *to_var, STATUS_VAR *from_var,
                        STATUS_VAR *dec_var)
{
  ulong *end= (ulong*) ((byte*) to_var + offsetof(STATUS_VAR,
						  last_system_status_var) +
			sizeof(ulong));
  ulong *to= (ulong*) to_var, *from= (ulong*) from_var, *dec= (ulong*) dec_var;

  while (to != end)
    *(to++)+= *(from++) - *(dec++);
}

716

hf@genie.(none)'s avatar
SCRUM  
hf@genie.(none) committed
717
void THD::awake(THD::killed_state state_to_set)
718
{
719
  DBUG_ENTER("THD::awake");
720
  DBUG_PRINT("enter", ("this: 0x%lx", (long) this));
721
  THD_CHECK_SENTRY(this);
722 723
  safe_mutex_assert_owner(&LOCK_delete); 

hf@genie.(none)'s avatar
SCRUM  
hf@genie.(none) committed
724 725
  killed= state_to_set;
  if (state_to_set != THD::KILL_QUERY)
726
  {
727 728 729
    thr_alarm_kill(thread_id);
    if (!slave_thread)
      thread_scheduler.post_kill_notification(this);
730
#ifdef SIGNAL_WITH_VIO_CLOSE
731
    close_active_vio();
732
#endif    
733
  }
734
  if (mysys_var)
735 736 737 738 739 740 741 742 743
  {
    pthread_mutex_lock(&mysys_var->mutex);
    if (!system_thread)		// Don't abort locks
      mysys_var->abort=1;
    /*
      This broadcast could be up in the air if the victim thread
      exits the cond in the time between read and broadcast, but that is
      ok since all we want to do is to make the victim thread get out
      of waiting on current_cond.
744 745 746 747 748
      If we see a non-zero current_cond: it cannot be an old value (because
      then exit_cond() should have run and it can't because we have mutex); so
      it is the true value but maybe current_mutex is not yet non-zero (we're
      in the middle of enter_cond() and there is a "memory order
      inversion"). So we test the mutex too to not lock 0.
749

750
      Note that there is a small chance we fail to kill. If victim has locked
751 752 753 754 755
      current_mutex, but hasn't yet entered enter_cond() (which means that
      current_cond and current_mutex are 0), then the victim will not get
      a signal and it may wait "forever" on the cond (until
      we issue a second KILL or the status it's waiting for happens).
      It's true that we have set its thd->killed but it may not
756
      see it immediately and so may have time to reach the cond_wait().
757
    */
758
    if (mysys_var->current_cond && mysys_var->current_mutex)
759
    {
760 761 762
      pthread_mutex_lock(mysys_var->current_mutex);
      pthread_cond_broadcast(mysys_var->current_cond);
      pthread_mutex_unlock(mysys_var->current_mutex);
763
    }
764 765
    pthread_mutex_unlock(&mysys_var->mutex);
  }
766
  DBUG_VOID_RETURN;
767 768
}

769 770 771 772
/*
  Remember the location of thread info, the structure needed for
  sql_alloc() and the structure for the net buffer
*/
bk@work.mysql.com's avatar
bk@work.mysql.com committed
773 774 775

bool THD::store_globals()
{
776 777 778 779
  /*
    Assert that thread_stack is initialized: it's necessary to be able
    to track stack overrun.
  */
780
  DBUG_ASSERT(thread_stack);
781

782
  if (my_pthread_setspecific_ptr(THR_THD,  this) ||
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
783
      my_pthread_setspecific_ptr(THR_MALLOC, &mem_root))
784 785
    return 1;
  mysys_var=my_thread_var;
guilhem@mysql.com's avatar
guilhem@mysql.com committed
786
  /*
787 788
    Let mysqld define the thread id (not mysys)
    This allows us to move THD to different threads if needed.
guilhem@mysql.com's avatar
guilhem@mysql.com committed
789
  */
790 791 792
  mysys_var->id= thread_id;
  real_id= pthread_self();                      // For debugging

793 794 795 796
  /*
    We have to call thr_lock_info_init() again here as THD may have been
    created in another thread
  */
797
  thr_lock_info_init(&lock_info);
798
  return 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
799 800
}

801

802 803 804 805 806
/*
  Cleanup after query.

  SYNOPSIS
    THD::cleanup_after_query()
807

808
  DESCRIPTION
809
    This function is used to reset thread data to its default state.
810 811 812 813 814 815 816

  NOTE
    This function is not suitable for setting thread data to some
    non-default values, as there is only one replication thread, so
    different master threads may overwrite data of each other on
    slave.
*/
817

818 819
void THD::cleanup_after_query()
{
820 821 822 823 824 825 826 827 828 829
  /*
    Reset rand_used so that detection of calls to rand() will save random 
    seeds if needed by the slave.

    Do not reset rand_used if inside a stored function or trigger because 
    only the call to these operations is logged. Thus only the calling 
    statement needs to detect rand() calls made by its substatements. These
    substatements must not set rand_used to 0 because it would remove the
    detection of rand() by the calling statement. 
  */
830 831 832 833 834
  if (!in_sub_stmt) /* stored functions and triggers are a special case */
  {
    /* Forget those values, for next binlogger: */
    stmt_depends_on_first_successful_insert_id_in_prev_stmt= 0;
    auto_inc_intervals_in_cur_stmt_for_binlog.empty();
835
    rand_used= 0;
836
  }
837
  if (first_successful_insert_id_in_cur_stmt > 0)
838
  {
839 840 841 842
    /* set what LAST_INSERT_ID() will return */
    first_successful_insert_id_in_prev_stmt= 
      first_successful_insert_id_in_cur_stmt;
    first_successful_insert_id_in_cur_stmt= 0;
evgen@sunlight.local's avatar
evgen@sunlight.local committed
843
    substitute_null_with_insert_id= TRUE;
844
  }
845
  arg_of_last_insert_id_function= 0;
846
  /* Free Items that were created during this execution */
847
  free_items();
848 849
  /* Reset where. */
  where= THD::DEFAULT_WHERE;
850 851
}

852

monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878
/*
  Convert a string to another character set

  SYNOPSIS
    convert_string()
    to				Store new allocated string here
    to_cs			New character set for allocated string
    from			String to convert
    from_length			Length of string to convert
    from_cs			Original character set

  NOTES
    to will be 0-terminated to make it easy to pass to system funcs

  RETURN
    0	ok
    1	End of memory.
        In this case to->str will point to 0 and to->length will be 0.
*/

bool THD::convert_string(LEX_STRING *to, CHARSET_INFO *to_cs,
			 const char *from, uint from_length,
			 CHARSET_INFO *from_cs)
{
  DBUG_ENTER("convert_string");
  size_s new_length= to_cs->mbmaxlen * from_length;
879
  uint dummy_errors;
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
880 881 882 883 884 885
  if (!(to->str= alloc(new_length+1)))
  {
    to->length= 0;				// Safety fix
    DBUG_RETURN(1);				// EOM
  }
  to->length= copy_and_convert((char*) to->str, new_length, to_cs,
886
			       from, from_length, from_cs, &dummy_errors);
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
887 888 889 890 891
  to->str[to->length]=0;			// Safety
  DBUG_RETURN(0);
}


892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908
/*
  Convert string from source character set to target character set inplace.

  SYNOPSIS
    THD::convert_string

  DESCRIPTION
    Convert string using convert_buffer - buffer for character set 
    conversion shared between all protocols.

  RETURN
    0   ok
   !0   out of memory
*/

bool THD::convert_string(String *s, CHARSET_INFO *from_cs, CHARSET_INFO *to_cs)
{
909 910
  uint dummy_errors;
  if (convert_buffer.copy(s->ptr(), s->length(), from_cs, to_cs, &dummy_errors))
911 912 913 914 915 916 917 918 919 920 921
    return TRUE;
  /* If convert_buffer >> s copying is more efficient long term */
  if (convert_buffer.alloced_length() >= convert_buffer.length() * 2 ||
      !s->is_alloced())
  {
    return s->copy(convert_buffer);
  }
  s->swap(convert_buffer);
  return FALSE;
}

922

monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
923 924 925 926 927 928
/*
  Update some cache variables when character set changes
*/

void THD::update_charset()
{
929 930 931 932 933 934 935
  uint32 not_used;
  charset_is_system_charset= !String::needs_conversion(0,charset(),
                                                       system_charset_info,
                                                       &not_used);
  charset_is_collation_connection= 
    !String::needs_conversion(0,charset(),variables.collation_connection,
                              &not_used);
936 937 938
  charset_is_character_set_filesystem= 
    !String::needs_conversion(0, charset(),
                              variables.character_set_filesystem, &not_used);
monty@mashka.mysql.fi's avatar
monty@mashka.mysql.fi committed
939 940 941
}


942 943 944 945 946 947 948 949 950 951 952 953 954 955
/* routings to adding tables to list of changed in transaction tables */

inline static void list_include(CHANGED_TABLE_LIST** prev,
				CHANGED_TABLE_LIST* curr,
				CHANGED_TABLE_LIST* new_table)
{
  if (new_table)
  {
    *prev = new_table;
    (*prev)->next = curr;
  }
}

/* add table to list of changed in transaction tables */
956

957 958
void THD::add_changed_table(TABLE *table)
{
959
  DBUG_ENTER("THD::add_changed_table(table)");
960

961
  DBUG_ASSERT((options & (OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN)) &&
962
	      table->file->has_transactions());
963 964
  add_changed_table(table->s->table_cache_key.str,
                    table->s->table_cache_key.length);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
965
  DBUG_VOID_RETURN;
966
}
967

968

969 970 971
void THD::add_changed_table(const char *key, long key_length)
{
  DBUG_ENTER("THD::add_changed_table(key)");
972 973
  CHANGED_TABLE_LIST **prev_changed = &transaction.changed_tables;
  CHANGED_TABLE_LIST *curr = transaction.changed_tables;
974

975
  for (; curr; prev_changed = &(curr->next), curr = curr->next)
976
  {
977
    int cmp =  (long)curr->key_length - (long)key_length;
978 979
    if (cmp < 0)
    {
980
      list_include(prev_changed, curr, changed_table_dup(key, key_length));
981
      DBUG_PRINT("info", 
982 983
		 ("key_length: %ld  %u", key_length,
                  (*prev_changed)->key_length));
984 985 986 987
      DBUG_VOID_RETURN;
    }
    else if (cmp == 0)
    {
988
      cmp = memcmp(curr->key, key, curr->key_length);
989 990
      if (cmp < 0)
      {
991
	list_include(prev_changed, curr, changed_table_dup(key, key_length));
992
	DBUG_PRINT("info", 
993
		   ("key_length:  %ld  %u", key_length,
994
		    (*prev_changed)->key_length));
995 996 997 998 999 1000 1001 1002 1003
	DBUG_VOID_RETURN;
      }
      else if (cmp == 0)
      {
	DBUG_PRINT("info", ("already in list"));
	DBUG_VOID_RETURN;
      }
    }
  }
1004
  *prev_changed = changed_table_dup(key, key_length);
1005
  DBUG_PRINT("info", ("key_length: %ld  %u", key_length,
1006
		      (*prev_changed)->key_length));
1007 1008 1009
  DBUG_VOID_RETURN;
}

1010

1011
CHANGED_TABLE_LIST* THD::changed_table_dup(const char *key, long key_length)
1012 1013 1014
{
  CHANGED_TABLE_LIST* new_table = 
    (CHANGED_TABLE_LIST*) trans_alloc(ALIGN_SIZE(sizeof(CHANGED_TABLE_LIST))+
1015
				      key_length + 1);
1016 1017
  if (!new_table)
  {
1018 1019
    my_error(EE_OUTOFMEMORY, MYF(ME_BELL),
             ALIGN_SIZE(sizeof(TABLE_LIST)) + key_length + 1);
hf@genie.(none)'s avatar
SCRUM  
hf@genie.(none) committed
1020
    killed= KILL_CONNECTION;
1021 1022 1023 1024 1025 1026
    return 0;
  }

  new_table->key = (char *) (((byte*)new_table)+
			     ALIGN_SIZE(sizeof(CHANGED_TABLE_LIST)));
  new_table->next = 0;
1027 1028
  new_table->key_length = key_length;
  ::memcpy(new_table->key, key, key_length);
1029 1030 1031
  return new_table;
}

1032

bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1033 1034 1035 1036
int THD::send_explain_fields(select_result *result)
{
  List<Item> field_list;
  Item *item;
1037
  CHARSET_INFO *cs= system_charset_info;
1038
  field_list.push_back(new Item_return_int("id",3, MYSQL_TYPE_LONGLONG));
1039
  field_list.push_back(new Item_empty_string("select_type", 19, cs));
1040
  field_list.push_back(item= new Item_empty_string("table", NAME_CHAR_LEN, cs));
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
1041
  item->maybe_null= 1;
1042 1043
  if (lex->describe & DESCRIBE_PARTITIONS)
  {
1044 1045 1046 1047
    /* Maximum length of string that make_used_partitions_str() can produce */
    item= new Item_empty_string("partitions", MAX_PARTITIONS * (1 + FN_LEN),
                                cs);
    field_list.push_back(item);
1048 1049
    item->maybe_null= 1;
  }
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
1050 1051
  field_list.push_back(item= new Item_empty_string("type", 10, cs));
  item->maybe_null= 1;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1052
  field_list.push_back(item=new Item_empty_string("possible_keys",
1053
						  NAME_CHAR_LEN*MAX_KEY, cs));
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1054
  item->maybe_null=1;
1055
  field_list.push_back(item=new Item_empty_string("key", NAME_CHAR_LEN, cs));
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1056
  item->maybe_null=1;
1057
  field_list.push_back(item=new Item_empty_string("key_len",
1058
						  NAME_CHAR_LEN*MAX_KEY));
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1059 1060
  item->maybe_null=1;
  field_list.push_back(item=new Item_empty_string("ref",
1061 1062
                                                  NAME_CHAR_LEN*MAX_REF_PARTS,
                                                  cs));
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1063
  item->maybe_null=1;
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
1064 1065
  field_list.push_back(item= new Item_return_int("rows", 10,
                                                 MYSQL_TYPE_LONGLONG));
1066 1067 1068 1069 1070
  if (lex->describe & DESCRIBE_EXTENDED)
  {
    field_list.push_back(item= new Item_float("filtered", 0.1234, 2, 4));
    item->maybe_null=1;
  }
igor@rurik.mysql.com's avatar
igor@rurik.mysql.com committed
1071
  item->maybe_null= 1;
1072
  field_list.push_back(new Item_empty_string("Extra", 255, cs));
1073 1074
  return (result->send_fields(field_list,
                              Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF));
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1075
}
1076

1077 1078 1079
#ifdef SIGNAL_WITH_VIO_CLOSE
void THD::close_active_vio()
{
1080
  DBUG_ENTER("close_active_vio");
1081
  safe_mutex_assert_owner(&LOCK_delete); 
1082
#ifndef EMBEDDED_LIBRARY
1083 1084 1085 1086 1087
  if (active_vio)
  {
    vio_close(active_vio);
    active_vio = 0;
  }
1088
#endif
1089
  DBUG_VOID_RETURN;
1090 1091 1092
}
#endif

1093

1094 1095 1096 1097 1098
struct Item_change_record: public ilink
{
  Item **place;
  Item *old_value;
  /* Placement new was hidden by `new' in ilink (TODO: check): */
1099
  static void *operator new(size_t size, void *mem) { return mem; }
1100 1101
  static void operator delete(void *ptr, size_t size) {}
  static void operator delete(void *ptr, void *mem) { /* never called */ }
1102 1103 1104 1105 1106 1107
};


/*
  Register an item tree tree transformation, performed by the query
  optimizer. We need a pointer to runtime_memroot because it may be !=
konstantin@mysql.com's avatar
konstantin@mysql.com committed
1108
  thd->mem_root (due to possible set_n_backup_active_arena called for thd).
1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122
*/

void THD::nocheck_register_item_tree_change(Item **place, Item *old_value,
                                            MEM_ROOT *runtime_memroot)
{
  Item_change_record *change;
  /*
    Now we use one node per change, which adds some memory overhead,
    but still is rather fast as we use alloc_root for allocations.
    A list of item tree changes of an average query should be short.
  */
  void *change_mem= alloc_root(runtime_memroot, sizeof(*change));
  if (change_mem == 0)
  {
1123 1124 1125 1126
    /*
      OOM, thd->fatal_error() is called by the error handler of the
      memroot. Just return.
    */
1127 1128 1129 1130 1131
    return;
  }
  change= new (change_mem) Item_change_record;
  change->place= place;
  change->old_value= old_value;
1132
  change_list.append(change);
1133 1134 1135 1136 1137 1138 1139
}


void THD::rollback_item_tree_changes()
{
  I_List_iterator<Item_change_record> it(change_list);
  Item_change_record *change;
monty@mysql.com's avatar
monty@mysql.com committed
1140 1141
  DBUG_ENTER("rollback_item_tree_changes");

1142 1143 1144 1145
  while ((change= it++))
    *change->place= change->old_value;
  /* We can forget about changes memory: it's allocated in runtime memroot */
  change_list.empty();
monty@mysql.com's avatar
monty@mysql.com committed
1146
  DBUG_VOID_RETURN;
1147 1148 1149
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
1150 1151 1152 1153 1154 1155 1156 1157 1158
/*****************************************************************************
** Functions to provide a interface to select results
*****************************************************************************/

select_result::select_result()
{
  thd=current_thd;
}

1159 1160
void select_result::send_error(uint errcode,const char *err)
{
1161
  my_message(errcode, err, MYF(0));
1162 1163
}

1164 1165 1166 1167 1168 1169

void select_result::cleanup()
{
  /* do nothing */
}

1170 1171 1172 1173 1174 1175 1176
bool select_result::check_simple_select() const
{
  my_error(ER_SP_BAD_CURSOR_QUERY, MYF(0));
  return TRUE;
}


1177 1178 1179
static String default_line_term("\n",default_charset_info);
static String default_escaped("\\",default_charset_info);
static String default_field_term("\t",default_charset_info);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1180 1181 1182 1183 1184

sql_exchange::sql_exchange(char *name,bool flag)
  :file_name(name), opt_enclosed(0), dumpfile(flag), skip_lines(0)
{
  field_term= &default_field_term;
hf@deer.(none)'s avatar
SCRUM  
hf@deer.(none) committed
1185
  enclosed=   line_start= &my_empty_string;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1186 1187
  line_term=  &default_line_term;
  escaped=    &default_escaped;
1188
  cs= NULL;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1189 1190
}

1191
bool select_send::send_fields(List<Item> &list, uint flags)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1192
{
1193 1194 1195 1196
  bool res;
  if (!(res= thd->protocol->send_fields(&list, flags)))
    status= 1;
  return res;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1197 1198
}

1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220
void select_send::abort()
{
  DBUG_ENTER("select_send::abort");
  if (status && thd->spcont &&
      thd->spcont->find_handler(thd->net.last_errno,
                                MYSQL_ERROR::WARN_LEVEL_ERROR))
  {
    /*
      Executing stored procedure without a handler.
      Here we should actually send an error to the client,
      but as an error will break a multiple result set, the only thing we
      can do for now is to nicely end the current data set and remembering
      the error so that the calling routine will abort
    */
    thd->net.report_error= 0;
    send_eof();
    thd->net.report_error= 1; // Abort SP
  }
  DBUG_VOID_RETURN;
}


bk@work.mysql.com's avatar
bk@work.mysql.com committed
1221 1222 1223 1224
/* Send data to client. Returns 0 if ok */

bool select_send::send_data(List<Item> &items)
{
1225
  if (unit->offset_limit_cnt)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1226
  {						// using limit offset,count
1227
    unit->offset_limit_cnt--;
1228
    return 0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1229
  }
1230

monty@narttu.mysql.fi's avatar
monty@narttu.mysql.fi committed
1231 1232 1233 1234 1235
  /*
    We may be passing the control from mysqld to the client: release the
    InnoDB adaptive hash S-latch to avoid thread deadlocks if it was reserved
    by thd
  */
1236
  ha_release_temporary_latches(thd);
1237

1238 1239 1240
  List_iterator_fast<Item> li(items);
  Protocol *protocol= thd->protocol;
  char buff[MAX_FIELD_WIDTH];
1241
  String buffer(buff, sizeof(buff), &my_charset_bin);
1242
  DBUG_ENTER("select_send::send_data");
1243 1244

  protocol->prepare_for_resend();
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1245 1246 1247
  Item *item;
  while ((item=li++))
  {
1248
    if (item->send(protocol, &buffer))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1249
    {
1250
      protocol->free();				// Free used buffer
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1251
      my_message(ER_OUT_OF_RESOURCES, ER(ER_OUT_OF_RESOURCES), MYF(0));
1252
      break;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1253 1254
    }
  }
1255
  thd->sent_row_count++;
1256
  if (!thd->vio_ok())
1257
    DBUG_RETURN(0);
1258
  if (!thd->net.report_error)
1259
    DBUG_RETURN(protocol->write());
1260
  protocol->remove_last_row();
1261
  DBUG_RETURN(1);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1262 1263 1264 1265
}

bool select_send::send_eof()
{
1266 1267 1268 1269 1270 1271
  /* 
    We may be passing the control from mysqld to the client: release the
    InnoDB adaptive hash S-latch to avoid thread deadlocks if it was reserved
    by thd 
  */
  ha_release_temporary_latches(thd);
1272

bk@work.mysql.com's avatar
bk@work.mysql.com committed
1273 1274 1275
  /* Unlock tables before sending packet to gain some speed */
  if (thd->lock)
  {
1276 1277
    mysql_unlock_tables(thd, thd->lock);
    thd->lock=0;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1278
  }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1279 1280
  if (!thd->net.report_error)
  {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1281
    ::send_eof(thd);
1282
    status= 0;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1283 1284 1285 1286
    return 0;
  }
  else
    return 1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1287 1288 1289
}


1290 1291 1292
/************************************************************************
  Handling writing to file
************************************************************************/
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1293

1294 1295
void select_to_file::send_error(uint errcode,const char *err)
{
1296
  my_message(errcode, err, MYF(0));
1297 1298 1299 1300 1301 1302 1303 1304
  if (file > 0)
  {
    (void) end_io_cache(&cache);
    (void) my_close(file,MYF(0));
    (void) my_delete(path,MYF(0));		// Delete file on error
    file= -1;
  }
}
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1305 1306


1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332
bool select_to_file::send_eof()
{
  int error= test(end_io_cache(&cache));
  if (my_close(file,MYF(MY_WME)))
    error= 1;
  if (!error)
    ::send_ok(thd,row_count);
  file= -1;
  return error;
}


void select_to_file::cleanup()
{
  /* In case of error send_eof() may be not called: close the file here. */
  if (file >= 0)
  {
    (void) end_io_cache(&cache);
    (void) my_close(file,MYF(0));
    file= -1;
  }
  path[0]= '\0';
  row_count= 0;
}


1333
select_to_file::~select_to_file()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1334 1335 1336 1337 1338 1339 1340
{
  if (file >= 0)
  {					// This only happens in case of error
    (void) end_io_cache(&cache);
    (void) my_close(file,MYF(0));
    file= -1;
  }
1341 1342 1343 1344 1345 1346 1347 1348
}

/***************************************************************************
** Export of select to textfile
***************************************************************************/

select_export::~select_export()
{
1349
  thd->sent_row_count=row_count;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1350 1351
}

1352

1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370
/*
  Create file with IO cache

  SYNOPSIS
    create_file()
    thd			Thread handle
    path		File name
    exchange		Excange class
    cache		IO cache

  RETURN
    >= 0 	File handle
   -1		Error
*/


static File create_file(THD *thd, char *path, sql_exchange *exchange,
			IO_CACHE *cache)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1371
{
1372
  File file;
1373
  uint option= MY_UNPACK_FILENAME | MY_RELATIVE_PATH;
1374

bk@work.mysql.com's avatar
bk@work.mysql.com committed
1375
#ifdef DONT_ALLOW_FULL_LOAD_DATA_PATHS
1376
  option|= MY_REPLACE_DIR;			// Force use of db directory
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1377
#endif
1378

hf@deer.(none)'s avatar
hf@deer.(none) committed
1379
  if (!dirname_length(exchange->file_name))
1380
  {
1381 1382
    strxnmov(path, FN_REFLEN-1, mysql_real_data_home, thd->db ? thd->db : "",
             NullS);
1383 1384 1385 1386
    (void) fn_format(path, exchange->file_name, path, "", option);
  }
  else
    (void) fn_format(path, exchange->file_name, mysql_real_data_home, "", option);
1387 1388 1389 1390 1391 1392 1393 1394 1395

  if (opt_secure_file_priv &&
      strncmp(opt_secure_file_priv, path, strlen(opt_secure_file_priv)))
  {
    /* Write only allowed to dir or subdir specified by secure_file_priv */
    my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0), "--secure-file-priv");
    return -1;
  }

1396
  if (!access(path, F_OK))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1397
  {
1398
    my_error(ER_FILE_EXISTS_ERROR, MYF(0), exchange->file_name);
1399
    return -1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1400 1401
  }
  /* Create the file world readable */
serg@serg.mylan's avatar
serg@serg.mylan committed
1402
  if ((file= my_create(path, 0666, O_WRONLY|O_EXCL, MYF(MY_WME))) < 0)
1403
    return file;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1404
#ifdef HAVE_FCHMOD
1405
  (void) fchmod(file, 0666);			// Because of umask()
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1406
#else
1407
  (void) chmod(path, 0666);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1408
#endif
1409
  if (init_io_cache(cache, file, 0L, WRITE_CACHE, 0L, 1, MYF(MY_WME)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1410
  {
1411
    my_close(file, MYF(0));
1412
    my_delete(path, MYF(0));  // Delete file on error, it was just created 
1413
    return -1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1414
  }
1415
  return file;
1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426
}


int
select_export::prepare(List<Item> &list, SELECT_LEX_UNIT *u)
{
  bool blob_flag=0;
  unit= u;
  if ((uint) strlen(exchange->file_name) + NAME_LEN >= FN_REFLEN)
    strmake(path,exchange->file_name,FN_REFLEN-1);

1427
  if ((file= create_file(thd, path, exchange, &cache)) < 0)
1428
    return 1;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1429 1430
  /* Check if there is any blobs in data */
  {
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
1431
    List_iterator_fast<Item> li(list);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462
    Item *item;
    while ((item=li++))
    {
      if (item->max_length >= MAX_BLOB_WIDTH)
      {
	blob_flag=1;
	break;
      }
    }
  }
  field_term_length=exchange->field_term->length();
  if (!exchange->line_term->length())
    exchange->line_term=exchange->field_term;	// Use this if it exists
  field_sep_char= (exchange->enclosed->length() ? (*exchange->enclosed)[0] :
		   field_term_length ? (*exchange->field_term)[0] : INT_MAX);
  escape_char=	(exchange->escaped->length() ? (*exchange->escaped)[0] : -1);
  line_sep_char= (exchange->line_term->length() ?
		  (*exchange->line_term)[0] : INT_MAX);
  if (!field_term_length)
    exchange->opt_enclosed=0;
  if (!exchange->enclosed->length())
    exchange->opt_enclosed=1;			// A little quicker loop
  fixed_row_size= (!field_term_length && !exchange->enclosed->length() &&
		   !blob_flag);
  return 0;
}


bool select_export::send_data(List<Item> &items)
{

1463
  DBUG_ENTER("select_export::send_data");
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1464 1465
  char buff[MAX_FIELD_WIDTH],null_buff[2],space[MAX_FIELD_WIDTH];
  bool space_inited=0;
1466
  String tmp(buff,sizeof(buff),&my_charset_bin),*res;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1467 1468
  tmp.length(0);

1469
  if (unit->offset_limit_cnt)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1470
  {						// using limit offset,count
1471
    unit->offset_limit_cnt--;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1472 1473 1474 1475 1476
    DBUG_RETURN(0);
  }
  row_count++;
  Item *item;
  uint used_length=0,items_left=items.elements;
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
1477
  List_iterator_fast<Item> li(items);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525

  if (my_b_write(&cache,(byte*) exchange->line_start->ptr(),
		 exchange->line_start->length()))
    goto err;
  while ((item=li++))
  {
    Item_result result_type=item->result_type();
    res=item->str_result(&tmp);
    if (res && (!exchange->opt_enclosed || result_type == STRING_RESULT))
    {
      if (my_b_write(&cache,(byte*) exchange->enclosed->ptr(),
		     exchange->enclosed->length()))
	goto err;
    }
    if (!res)
    {						// NULL
      if (!fixed_row_size)
      {
	if (escape_char != -1)			// Use \N syntax
	{
	  null_buff[0]=escape_char;
	  null_buff[1]='N';
	  if (my_b_write(&cache,(byte*) null_buff,2))
	    goto err;
	}
	else if (my_b_write(&cache,(byte*) "NULL",4))
	  goto err;
      }
      else
      {
	used_length=0;				// Fill with space
      }
    }
    else
    {
      if (fixed_row_size)
	used_length=min(res->length(),item->max_length);
      else
	used_length=res->length();
      if (result_type == STRING_RESULT && escape_char != -1)
      {
	char *pos,*start,*end;

	for (start=pos=(char*) res->ptr(),end=pos+used_length ;
	     pos != end ;
	     pos++)
	{
#ifdef USE_MB
1526 1527
          CHARSET_INFO *res_charset=res->charset();
	  if (use_mb(res_charset))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1528 1529
	  {
	    int l;
1530
	    if ((l=my_ismbchar(res_charset, pos, end)))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565
	    {
	      pos += l-1;
	      continue;
	    }
	  }
#endif
	  if ((int) *pos == escape_char || (int) *pos == field_sep_char ||
	      (int) *pos == line_sep_char || !*pos)
	  {
	    char tmp_buff[2];
	    tmp_buff[0]= escape_char;
	    tmp_buff[1]= *pos ? *pos : '0';
	    if (my_b_write(&cache,(byte*) start,(uint) (pos-start)) ||
		my_b_write(&cache,(byte*) tmp_buff,2))
	      goto err;
	    start=pos+1;
	  }
	}
	if (my_b_write(&cache,(byte*) start,(uint) (pos-start)))
	  goto err;
      }
      else if (my_b_write(&cache,(byte*) res->ptr(),used_length))
	goto err;
    }
    if (fixed_row_size)
    {						// Fill with space
      if (item->max_length > used_length)
      {
	/* QQ:  Fix by adding a my_b_fill() function */
	if (!space_inited)
	{
	  space_inited=1;
	  bfill(space,sizeof(space),' ');
	}
	uint length=item->max_length-used_length;
1566
	for (; length > sizeof(space) ; length-=sizeof(space))
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1567 1568 1569 1570 1571 1572 1573 1574 1575 1576
	{
	  if (my_b_write(&cache,(byte*) space,sizeof(space)))
	    goto err;
	}
	if (my_b_write(&cache,(byte*) space,length))
	  goto err;
      }
    }
    if (res && (!exchange->opt_enclosed || result_type == STRING_RESULT))
    {
1577 1578 1579
      if (my_b_write(&cache, (byte*) exchange->enclosed->ptr(),
                     exchange->enclosed->length()))
        goto err;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1580 1581 1582
    }
    if (--items_left)
    {
1583 1584 1585
      if (my_b_write(&cache, (byte*) exchange->field_term->ptr(),
                     field_term_length))
        goto err;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602
    }
  }
  if (my_b_write(&cache,(byte*) exchange->line_term->ptr(),
		 exchange->line_term->length()))
    goto err;
  DBUG_RETURN(0);
err:
  DBUG_RETURN(1);
}


/***************************************************************************
** Dump  of select to a binary file
***************************************************************************/


int
1603 1604
select_dump::prepare(List<Item> &list __attribute__((unused)),
		     SELECT_LEX_UNIT *u)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1605
{
1606
  unit= u;
1607
  return (int) ((file= create_file(thd, path, exchange, &cache)) < 0);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1608 1609 1610 1611 1612
}


bool select_dump::send_data(List<Item> &items)
{
monty@tik.mysql.fi's avatar
monty@tik.mysql.fi committed
1613
  List_iterator_fast<Item> li(items);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1614
  char buff[MAX_FIELD_WIDTH];
1615
  String tmp(buff,sizeof(buff),&my_charset_bin),*res;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1616 1617
  tmp.length(0);
  Item *item;
1618
  DBUG_ENTER("select_dump::send_data");
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1619

1620
  if (unit->offset_limit_cnt)
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1621
  {						// using limit offset,count
1622
    unit->offset_limit_cnt--;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1623 1624 1625 1626
    DBUG_RETURN(0);
  }
  if (row_count++ > 1) 
  {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1627
    my_message(ER_TOO_MANY_ROWS, ER(ER_TOO_MANY_ROWS), MYF(0));
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1628 1629 1630 1631 1632
    goto err;
  }
  while ((item=li++))
  {
    res=item->str_result(&tmp);
1633
    if (!res)					// If NULL
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1634
    {
1635 1636
      if (my_b_write(&cache,(byte*) "",1))
	goto err;
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1637 1638 1639
    }
    else if (my_b_write(&cache,(byte*) res->ptr(),res->length()))
    {
1640
      my_error(ER_ERROR_ON_WRITE, MYF(0), path, my_errno);
bk@work.mysql.com's avatar
bk@work.mysql.com committed
1641 1642 1643 1644 1645 1646 1647 1648 1649
      goto err;
    }
  }
  DBUG_RETURN(0);
err:
  DBUG_RETURN(1);
}


1650
select_subselect::select_subselect(Item_subselect *item_arg)
1651
{
1652
  item= item_arg;
1653 1654
}

1655

1656
bool select_singlerow_subselect::send_data(List<Item> &items)
1657
{
1658 1659
  DBUG_ENTER("select_singlerow_subselect::send_data");
  Item_singlerow_subselect *it= (Item_singlerow_subselect *)item;
Sinisa@sinisa.nasamreza.org's avatar
Sinisa@sinisa.nasamreza.org committed
1660 1661
  if (it->assigned())
  {
1662
    my_message(ER_SUBQUERY_NO_1_ROW, ER(ER_SUBQUERY_NO_1_ROW), MYF(0));
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1663 1664 1665
    DBUG_RETURN(1);
  }
  if (unit->offset_limit_cnt)
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1666
  {				          // Using limit offset,count
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1667 1668
    unit->offset_limit_cnt--;
    DBUG_RETURN(0);
1669
  }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1670
  List_iterator_fast<Item> li(items);
1671 1672 1673
  Item *val_item;
  for (uint i= 0; (val_item= li++); i++)
    it->store(i, val_item);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1674
  it->assigned(1);
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1675
  DBUG_RETURN(0);
1676
}
1677

1678

1679 1680 1681 1682 1683 1684 1685 1686
void select_max_min_finder_subselect::cleanup()
{
  DBUG_ENTER("select_max_min_finder_subselect::cleanup");
  cache= 0;
  DBUG_VOID_RETURN;
}


1687 1688 1689
bool select_max_min_finder_subselect::send_data(List<Item> &items)
{
  DBUG_ENTER("select_max_min_finder_subselect::send_data");
1690
  Item_maxmin_subselect *it= (Item_maxmin_subselect *)item;
1691 1692
  List_iterator_fast<Item> li(items);
  Item *val_item= li++;
1693
  it->register_value();
1694 1695 1696 1697 1698 1699 1700 1701 1702 1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715
  if (it->assigned())
  {
    cache->store(val_item);
    if ((this->*op)())
      it->store(0, cache);
  }
  else
  {
    if (!cache)
    {
      cache= Item_cache::get_cache(val_item->result_type());
      switch (val_item->result_type())
      {
      case REAL_RESULT:
	op= &select_max_min_finder_subselect::cmp_real;
	break;
      case INT_RESULT:
	op= &select_max_min_finder_subselect::cmp_int;
	break;
      case STRING_RESULT:
	op= &select_max_min_finder_subselect::cmp_str;
	break;
1716 1717 1718
      case DECIMAL_RESULT:
        op= &select_max_min_finder_subselect::cmp_decimal;
        break;
1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733
      case ROW_RESULT:
        // This case should never be choosen
	DBUG_ASSERT(0);
	op= 0;
      }
    }
    cache->store(val_item);
    it->store(0, cache);
  }
  it->assigned(1);
  DBUG_RETURN(0);
}

bool select_max_min_finder_subselect::cmp_real()
{
1734
  Item *maxmin= ((Item_singlerow_subselect *)item)->element_index(0);
1735
  double val1= cache->val_real(), val2= maxmin->val_real();
1736 1737 1738 1739
  if (fmax)
    return (cache->null_value && !maxmin->null_value) ||
      (!cache->null_value && !maxmin->null_value &&
       val1 > val2);
1740 1741 1742
  return (maxmin->null_value && !cache->null_value) ||
    (!cache->null_value && !maxmin->null_value &&
     val1 < val2);
1743 1744 1745 1746
}

bool select_max_min_finder_subselect::cmp_int()
{
1747
  Item *maxmin= ((Item_singlerow_subselect *)item)->element_index(0);
1748 1749 1750 1751 1752
  longlong val1= cache->val_int(), val2= maxmin->val_int();
  if (fmax)
    return (cache->null_value && !maxmin->null_value) ||
      (!cache->null_value && !maxmin->null_value &&
       val1 > val2);
1753 1754 1755
  return (maxmin->null_value && !cache->null_value) ||
    (!cache->null_value && !maxmin->null_value &&
     val1 < val2);
1756 1757
}

1758 1759
bool select_max_min_finder_subselect::cmp_decimal()
{
1760
  Item *maxmin= ((Item_singlerow_subselect *)item)->element_index(0);
1761 1762 1763 1764 1765 1766
  my_decimal cval, *cvalue= cache->val_decimal(&cval);
  my_decimal mval, *mvalue= maxmin->val_decimal(&mval);
  if (fmax)
    return (cache->null_value && !maxmin->null_value) ||
      (!cache->null_value && !maxmin->null_value &&
       my_decimal_cmp(cvalue, mvalue) > 0) ;
1767 1768 1769
  return (maxmin->null_value && !cache->null_value) ||
    (!cache->null_value && !maxmin->null_value &&
     my_decimal_cmp(cvalue,mvalue) < 0);
1770 1771
}

1772 1773 1774
bool select_max_min_finder_subselect::cmp_str()
{
  String *val1, *val2, buf1, buf2;
1775
  Item *maxmin= ((Item_singlerow_subselect *)item)->element_index(0);
1776 1777 1778 1779 1780 1781 1782 1783 1784 1785
  /*
    as far as both operand is Item_cache buf1 & buf2 will not be used,
    but added for safety
  */
  val1= cache->val_str(&buf1);
  val2= maxmin->val_str(&buf1);
  if (fmax)
    return (cache->null_value && !maxmin->null_value) ||
      (!cache->null_value && !maxmin->null_value &&
       sortcmp(val1, val2, cache->collation.collation) > 0) ;
1786 1787 1788
  return (maxmin->null_value && !cache->null_value) ||
    (!cache->null_value && !maxmin->null_value &&
     sortcmp(val1, val2, cache->collation.collation) < 0);
1789 1790
}

1791 1792 1793 1794 1795 1796 1797 1798 1799 1800
bool select_exists_subselect::send_data(List<Item> &items)
{
  DBUG_ENTER("select_exists_subselect::send_data");
  Item_exists_subselect *it= (Item_exists_subselect *)item;
  if (unit->offset_limit_cnt)
  {				          // Using limit offset,count
    unit->offset_limit_cnt--;
    DBUG_RETURN(0);
  }
  it->value= 1;
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1801
  it->assigned(1);
1802 1803 1804
  DBUG_RETURN(0);
}

Sinisa@sinisa.nasamreza.org's avatar
Sinisa@sinisa.nasamreza.org committed
1805 1806

/***************************************************************************
1807
  Dump of select to variables
Sinisa@sinisa.nasamreza.org's avatar
Sinisa@sinisa.nasamreza.org committed
1808
***************************************************************************/
1809

1810
int select_dumpvar::prepare(List<Item> &list, SELECT_LEX_UNIT *u)
Sinisa@sinisa.nasamreza.org's avatar
Sinisa@sinisa.nasamreza.org committed
1811
{
1812
  unit= u;
1813
  
1814
  if (var_list.elements != list.elements)
Sinisa@sinisa.nasamreza.org's avatar
Sinisa@sinisa.nasamreza.org committed
1815
  {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
1816 1817
    my_message(ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT,
               ER(ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT), MYF(0));
1818
    return 1;
1819
  }               
1820 1821
  return 0;
}
1822

1823

1824 1825 1826 1827 1828 1829 1830
bool select_dumpvar::check_simple_select() const
{
  my_error(ER_SP_BAD_CURSOR_SELECT, MYF(0));
  return TRUE;
}


1831 1832
void select_dumpvar::cleanup()
{
1833
  row_count= 0;
1834 1835 1836
}


serg@serg.mylan's avatar
serg@serg.mylan committed
1837
Query_arena::Type Query_arena::type() const
1838
{
monty@mysql.com's avatar
monty@mysql.com committed
1839
  DBUG_ASSERT(0); /* Should never be called */
1840
  return STATEMENT;
1841 1842 1843
}


1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858
void Query_arena::free_items()
{
  Item *next;
  DBUG_ENTER("Query_arena::free_items");
  /* This works because items are allocated with sql_alloc() */
  for (; free_list; free_list= next)
  {
    next= free_list->next;
    free_list->delete_self();
  }
  /* Postcondition: free_list is 0 */
  DBUG_VOID_RETURN;
}


1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871
void Query_arena::set_query_arena(Query_arena *set)
{
  mem_root=  set->mem_root;
  free_list= set->free_list;
  state= set->state;
}


void Query_arena::cleanup_stmt()
{
  DBUG_ASSERT("Query_arena::cleanup_stmt()" == "not implemented");
}

1872
/*
serg@janus.mylan's avatar
serg@janus.mylan committed
1873
  Statement functions
1874 1875
*/

1876 1877 1878
Statement::Statement(LEX *lex_arg, MEM_ROOT *mem_root_arg,
                     enum enum_state state_arg, ulong id_arg)
  :Query_arena(mem_root_arg, state_arg),
1879
  id(id_arg),
1880
  mark_used_columns(MARK_COLUMNS_READ),
1881
  lex(lex_arg),
1882
  query(0),
1883 1884
  query_length(0),
  cursor(0)
1885
{
1886
  name.str= NULL;
1887 1888 1889
}


serg@serg.mylan's avatar
serg@serg.mylan committed
1890
Query_arena::Type Statement::type() const
1891 1892 1893 1894 1895 1896 1897 1898
{
  return STATEMENT;
}


void Statement::set_statement(Statement *stmt)
{
  id=             stmt->id;
1899
  mark_used_columns=   stmt->mark_used_columns;
1900 1901 1902
  lex=            stmt->lex;
  query=          stmt->query;
  query_length=   stmt->query_length;
1903
  cursor=         stmt->cursor;
1904 1905 1906
}


1907 1908 1909
void
Statement::set_n_backup_statement(Statement *stmt, Statement *backup)
{
1910
  DBUG_ENTER("Statement::set_n_backup_statement");
1911 1912
  backup->set_statement(this);
  set_statement(stmt);
1913
  DBUG_VOID_RETURN;
1914 1915 1916 1917 1918
}


void Statement::restore_backup_statement(Statement *stmt, Statement *backup)
{
1919
  DBUG_ENTER("Statement::restore_backup_statement");
1920 1921
  stmt->set_statement(this);
  set_statement(backup);
1922
  DBUG_VOID_RETURN;
1923 1924 1925
}


1926
void THD::end_statement()
1927
{
1928
  /* Cleanup SQL processing state to reuse this statement in next query. */
1929 1930 1931
  lex_end(lex);
  delete lex->result;
  lex->result= 0;
1932 1933
  /* Note that free_list is freed in cleanup_after_query() */

1934 1935 1936 1937 1938 1939 1940
  /*
    Don't free mem_root, as mem_root is freed in the end of dispatch_command
    (once for any command).
  */
}


konstantin@mysql.com's avatar
konstantin@mysql.com committed
1941
void THD::set_n_backup_active_arena(Query_arena *set, Query_arena *backup)
1942
{
konstantin@mysql.com's avatar
konstantin@mysql.com committed
1943
  DBUG_ENTER("THD::set_n_backup_active_arena");
1944
  DBUG_ASSERT(backup->is_backup_arena == FALSE);
1945

konstantin@mysql.com's avatar
konstantin@mysql.com committed
1946 1947
  backup->set_query_arena(this);
  set_query_arena(set);
monty@mysql.com's avatar
monty@mysql.com committed
1948
#ifndef DBUG_OFF
1949
  backup->is_backup_arena= TRUE;
monty@mysql.com's avatar
monty@mysql.com committed
1950
#endif
1951
  DBUG_VOID_RETURN;
1952 1953 1954
}


konstantin@mysql.com's avatar
konstantin@mysql.com committed
1955
void THD::restore_active_arena(Query_arena *set, Query_arena *backup)
1956
{
konstantin@mysql.com's avatar
konstantin@mysql.com committed
1957
  DBUG_ENTER("THD::restore_active_arena");
1958
  DBUG_ASSERT(backup->is_backup_arena);
konstantin@mysql.com's avatar
konstantin@mysql.com committed
1959 1960
  set->set_query_arena(this);
  set_query_arena(backup);
monty@mysql.com's avatar
monty@mysql.com committed
1961
#ifndef DBUG_OFF
1962
  backup->is_backup_arena= FALSE;
1963
#endif
monty@mysql.com's avatar
monty@mysql.com committed
1964
  DBUG_VOID_RETURN;
1965 1966
}

1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986
Statement::~Statement()
{
}

C_MODE_START

static byte *
get_statement_id_as_hash_key(const byte *record, uint *key_length,
                             my_bool not_used __attribute__((unused)))
{
  const Statement *statement= (const Statement *) record; 
  *key_length= sizeof(statement->id);
  return (byte *) &((const Statement *) statement)->id;
}

static void delete_statement_as_hash_key(void *key)
{
  delete (Statement *) key;
}

1987 1988
static byte *get_stmt_name_hash_key(Statement *entry, uint *length,
                                    my_bool not_used __attribute__((unused)))
1989 1990 1991 1992 1993
{
  *length=(uint) entry->name.length;
  return (byte*) entry->name.str;
}

1994 1995 1996 1997 1998
C_MODE_END

Statement_map::Statement_map() :
  last_found_statement(0)
{
1999 2000 2001 2002 2003
  enum
  {
    START_STMT_HASH_SIZE = 16,
    START_NAME_HASH_SIZE = 16
  };
2004
  hash_init(&st_hash, &my_charset_bin, START_STMT_HASH_SIZE, 0, 0,
2005 2006
            get_statement_id_as_hash_key,
            delete_statement_as_hash_key, MYF(0));
2007
  hash_init(&names_hash, system_charset_info, START_NAME_HASH_SIZE, 0, 0,
2008 2009
            (hash_get_key) get_stmt_name_hash_key,
            NULL,MYF(0));
2010 2011
}

2012

2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029 2030 2031 2032 2033 2034
/*
  Insert a new statement to the thread-local statement map.

  DESCRIPTION
    If there was an old statement with the same name, replace it with the
    new one. Otherwise, check if max_prepared_stmt_count is not reached yet,
    increase prepared_stmt_count, and insert the new statement. It's okay
    to delete an old statement and fail to insert the new one.

  POSTCONDITIONS
    All named prepared statements are also present in names_hash.
    Statement names in names_hash are unique.
    The statement is added only if prepared_stmt_count < max_prepard_stmt_count
    last_found_statement always points to a valid statement or is 0

  RETURN VALUE
    0  success
    1  error: out of resources or max_prepared_stmt_count limit has been
       reached. An error is sent to the client, the statement is deleted.
*/

int Statement_map::insert(THD *thd, Statement *statement)
2035
{
2036
  if (my_hash_insert(&st_hash, (byte*) statement))
2037
  {
2038 2039 2040 2041 2042 2043 2044 2045
    /*
      Delete is needed only in case of an insert failure. In all other
      cases hash_delete will also delete the statement.
    */
    delete statement;
    my_error(ER_OUT_OF_RESOURCES, MYF(0));
    goto err_st_hash;
  }
2046
  if (statement->name.str && my_hash_insert(&names_hash, (byte*) statement))
2047
  {
2048 2049
    my_error(ER_OUT_OF_RESOURCES, MYF(0));
    goto err_names_hash;
2050
  }
2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061
  pthread_mutex_lock(&LOCK_prepared_stmt_count);
  /*
    We don't check that prepared_stmt_count is <= max_prepared_stmt_count
    because we would like to allow to lower the total limit
    of prepared statements below the current count. In that case
    no new statements can be added until prepared_stmt_count drops below
    the limit.
  */
  if (prepared_stmt_count >= max_prepared_stmt_count)
  {
    pthread_mutex_unlock(&LOCK_prepared_stmt_count);
2062 2063
    my_error(ER_MAX_PREPARED_STMT_COUNT_REACHED, MYF(0),
             max_prepared_stmt_count);
2064 2065 2066 2067 2068
    goto err_max;
  }
  prepared_stmt_count++;
  pthread_mutex_unlock(&LOCK_prepared_stmt_count);

2069
  last_found_statement= statement;
2070 2071 2072 2073 2074 2075 2076 2077 2078
  return 0;

err_max:
  if (statement->name.str)
    hash_delete(&names_hash, (byte*) statement);
err_names_hash:
  hash_delete(&st_hash, (byte*) statement);
err_st_hash:
  return 1;
2079 2080
}

2081

2082 2083
void Statement_map::close_transient_cursors()
{
2084
#ifdef TO_BE_IMPLEMENTED
2085 2086 2087
  Statement *stmt;
  while ((stmt= transient_cursor_list.head()))
    stmt->close_cursor();                 /* deletes itself from the list */
2088
#endif
2089 2090 2091
}


2092 2093 2094 2095 2096 2097
void Statement_map::erase(Statement *statement)
{
  if (statement == last_found_statement)
    last_found_statement= 0;
  if (statement->name.str)
    hash_delete(&names_hash, (byte *) statement);
2098

2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117
  hash_delete(&st_hash, (byte *) statement);
  pthread_mutex_lock(&LOCK_prepared_stmt_count);
  DBUG_ASSERT(prepared_stmt_count > 0);
  prepared_stmt_count--;
  pthread_mutex_unlock(&LOCK_prepared_stmt_count);
}


void Statement_map::reset()
{
  /* Must be first, hash_free will reset st_hash.records */
  pthread_mutex_lock(&LOCK_prepared_stmt_count);
  DBUG_ASSERT(prepared_stmt_count >= st_hash.records);
  prepared_stmt_count-= st_hash.records;
  pthread_mutex_unlock(&LOCK_prepared_stmt_count);

  my_hash_reset(&names_hash);
  my_hash_reset(&st_hash);
  last_found_statement= 0;
2118 2119
}

2120

2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132
Statement_map::~Statement_map()
{
  /* Must go first, hash_free will reset st_hash.records */
  pthread_mutex_lock(&LOCK_prepared_stmt_count);
  DBUG_ASSERT(prepared_stmt_count >= st_hash.records);
  prepared_stmt_count-= st_hash.records;
  pthread_mutex_unlock(&LOCK_prepared_stmt_count);

  hash_free(&names_hash);
  hash_free(&st_hash);
}

2133 2134
bool select_dumpvar::send_data(List<Item> &items)
{
2135
  List_iterator_fast<my_var> var_li(var_list);
2136
  List_iterator<Item> it(items);
2137
  Item *item;
2138
  my_var *mv;
2139
  DBUG_ENTER("select_dumpvar::send_data");
2140

2141
  if (unit->offset_limit_cnt)
2142
  {						// using limit offset,count
2143 2144 2145
    unit->offset_limit_cnt--;
    DBUG_RETURN(0);
  }
2146 2147
  if (row_count++) 
  {
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2148
    my_message(ER_TOO_MANY_ROWS, ER(ER_TOO_MANY_ROWS), MYF(0));
2149 2150
    DBUG_RETURN(1);
  }
2151
  while ((mv= var_li++) && (item= it++))
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2152
  {
2153
    if (mv->local)
2154
    {
2155 2156
      if (thd->spcont->set_variable(thd, mv->offset, &item))
	    DBUG_RETURN(1);
2157 2158 2159
    }
    else
    {
2160 2161 2162
      Item_func_set_user_var *suv= new Item_func_set_user_var(mv->s, item);
      suv->fix_fields(thd, 0);
      suv->check(0);
2163
      suv->update();
2164
    }
bell@sanja.is.com.ua's avatar
bell@sanja.is.com.ua committed
2165
  }
Sinisa@sinisa.nasamreza.org's avatar
Sinisa@sinisa.nasamreza.org committed
2166 2167 2168 2169 2170
  DBUG_RETURN(0);
}

bool select_dumpvar::send_eof()
{
2171
  if (! row_count)
serg@serg.mylan's avatar
serg@serg.mylan committed
2172 2173
    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                 ER_SP_FETCH_NO_DATA, ER(ER_SP_FETCH_NO_DATA));
2174 2175
  ::send_ok(thd,row_count);
  return 0;
Sinisa@sinisa.nasamreza.org's avatar
Sinisa@sinisa.nasamreza.org committed
2176
}
2177 2178 2179 2180 2181 2182 2183

/****************************************************************************
  TMP_TABLE_PARAM
****************************************************************************/

void TMP_TABLE_PARAM::init()
{
2184 2185
  DBUG_ENTER("TMP_TABLE_PARAM::init");
  DBUG_PRINT("enter", ("this: 0x%lx", (ulong)this));
2186 2187 2188
  field_count= sum_func_count= func_count= hidden_field_count= 0;
  group_parts= group_length= group_null_parts= 0;
  quick_group= 1;
2189
  table_charset= 0;
2190
  precomputed_group_by= 0;
2191
  DBUG_VOID_RETURN;
2192
}
2193 2194 2195 2196


void thd_increment_bytes_sent(ulong length)
{
serg@serg.mylan's avatar
serg@serg.mylan committed
2197
  THD *thd=current_thd;
lars@mysql.com's avatar
lars@mysql.com committed
2198
  if (likely(thd != 0))
serg@serg.mylan's avatar
serg@serg.mylan committed
2199 2200 2201
  { /* current_thd==0 when close_connection() calls net_send_error() */
    thd->status_var.bytes_sent+= length;
  }
2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220
}


void thd_increment_bytes_received(ulong length)
{
  current_thd->status_var.bytes_received+= length;
}


void thd_increment_net_big_packet_count(ulong length)
{
  current_thd->status_var.net_big_packet_count+= length;
}


void THD::set_status_var_init()
{
  bzero((char*) &status_var, sizeof(status_var));
}
2221

2222

2223
void Security_context::init()
2224 2225 2226
{
  host= user= priv_user= ip= 0;
  host_or_ip= "connecting host";
2227
  priv_host[0]= '\0';
2228 2229 2230 2231 2232 2233
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  db_access= NO_ACCESS;
#endif
}


2234
void Security_context::destroy()
2235 2236 2237 2238 2239 2240 2241 2242 2243 2244
{
  // If not pointer to constant
  if (host != my_localhost)
    safeFree(host);
  if (user != delayed_user)
    safeFree(user);
  safeFree(ip);
}


2245
void Security_context::skip_grants()
2246 2247 2248 2249 2250 2251 2252 2253 2254
{
  /* privileges for the user are unknown everything is allowed */
  host_or_ip= (char *)"";
  master_access= ~NO_ACCESS;
  priv_user= (char *)"";
  *priv_host= '\0';
}


2255 2256 2257 2258 2259 2260 2261
bool Security_context::set_user(char *user_arg)
{
  safeFree(user);
  user= my_strdup(user_arg, MYF(0));
  return user == 0;
}

2262 2263 2264 2265 2266 2267 2268 2269 2270 2271 2272 2273 2274 2275 2276 2277 2278 2279 2280 2281 2282 2283 2284 2285 2286 2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300 2301 2302 2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 2347 2348 2349 2350 2351 2352 2353 2354 2355 2356 2357
#ifndef NO_EMBEDDED_ACCESS_CHECKS
/**
  Initialize this security context from the passed in credentials
  and activate it in the current thread.

  @param[out]  backup  Save a pointer to the current security context
                       in the thread. In case of success it points to the
                       saved old context, otherwise it points to NULL.


  During execution of a statement, multiple security contexts may
  be needed:
  - the security context of the authenticated user, used as the
    default security context for all top-level statements
  - in case of a view or a stored program, possibly the security
    context of the definer of the routine, if the object is
    defined with SQL SECURITY DEFINER option.

  The currently "active" security context is parameterized in THD
  member security_ctx. By default, after a connection is
  established, this member points at the "main" security context
  - the credentials of the authenticated user.

  Later, if we would like to execute some sub-statement or a part
  of a statement under credentials of a different user, e.g.
  definer of a procedure, we authenticate this user in a local
  instance of Security_context by means of this method (and
  ultimately by means of acl_getroot_no_password), and make the
  local instance active in the thread by re-setting
  thd->security_ctx pointer.

  Note, that the life cycle and memory management of the "main" and
  temporary security contexts are different.
  For the main security context, the memory for user/host/ip is
  allocated on system heap, and the THD class frees this memory in
  its destructor. The only case when contents of the main security
  context may change during its life time is when someone issued
  CHANGE USER command.
  Memory management of a "temporary" security context is
  responsibility of the module that creates it.

  @retval TRUE  there is no user with the given credentials. The erro
                is reported in the thread.
  @retval FALSE success
*/

bool
Security_context::
change_security_context(THD *thd,
                        LEX_STRING *definer_user,
                        LEX_STRING *definer_host,
                        LEX_STRING *db,
                        Security_context **backup)
{
  bool needs_change;

  DBUG_ENTER("Security_context::change_security_context");

  DBUG_ASSERT(definer_user->str && definer_host->str);

  *backup= NULL;
  /*
    The current security context may have NULL members
    if we have just started the thread and not authenticated
    any user. This use case is currently in events worker thread.
  */
  needs_change= (thd->security_ctx->priv_user == NULL ||
                 strcmp(definer_user->str, thd->security_ctx->priv_user) ||
                 thd->security_ctx->priv_host == NULL ||
                 my_strcasecmp(system_charset_info, definer_host->str,
                               thd->security_ctx->priv_host));
  if (needs_change)
  {
    if (acl_getroot_no_password(this, definer_user->str, definer_host->str,
                                definer_host->str, db->str))
    {
      my_error(ER_NO_SUCH_USER, MYF(0), definer_user->str,
               definer_host->str);
      DBUG_RETURN(TRUE);
    }
    *backup= thd->security_ctx;
    thd->security_ctx= this;
  }

  DBUG_RETURN(FALSE);
}


void
Security_context::restore_security_context(THD *thd,
                                           Security_context *backup)
{
  if (backup)
    thd->security_ctx= backup;
}
#endif
2358

2359 2360 2361 2362 2363 2364 2365 2366
/****************************************************************************
  Handling of open and locked tables states.

  This is used when we want to open/lock (and then close) some tables when
  we already have a set of tables open and locked. We use these methods for
  access to mysql.proc table to find definitions of stored routines.
****************************************************************************/

2367
void THD::reset_n_backup_open_tables_state(Open_tables_state *backup)
2368
{
2369 2370
  DBUG_ENTER("reset_n_backup_open_tables_state");
  backup->set_open_tables_state(this);
2371
  reset_open_tables_state();
2372
  state_flags|= Open_tables_state::BACKUPS_AVAIL;
2373
  DBUG_VOID_RETURN;
2374 2375 2376
}


2377 2378 2379 2380 2381 2382 2383 2384 2385 2386 2387 2388
void THD::restore_backup_open_tables_state(Open_tables_state *backup)
{
  DBUG_ENTER("restore_backup_open_tables_state");
  /*
    Before we will throw away current open tables state we want
    to be sure that it was properly cleaned up.
  */
  DBUG_ASSERT(open_tables == 0 && temporary_tables == 0 &&
              handler_tables == 0 && derived_tables == 0 &&
              lock == 0 && locked_tables == 0 &&
              prelocked_mode == NON_PRELOCKED);
  set_open_tables_state(backup);
2389 2390
  DBUG_VOID_RETURN;
}
2391 2392


2393

2394 2395 2396 2397 2398 2399 2400 2401 2402 2403 2404 2405 2406
/****************************************************************************
  Handling of statement states in functions and triggers.

  This is used to ensure that the function/trigger gets a clean state
  to work with and does not cause any side effects of the calling statement.

  It also allows most stored functions and triggers to replicate even
  if they are used items that would normally be stored in the binary
  replication (like last_insert_id() etc...)

  The following things is done
  - Disable binary logging for the duration of the statement
  - Disable multi-result-sets for the duration of the statement
2407
  - Value of last_insert_id() is saved and restored
2408 2409 2410 2411
  - Value set by 'SET INSERT_ID=#' is reset and restored
  - Value for found_rows() is reset and restored
  - examined_row_count is added to the total
  - cuted_fields is added to the total
2412
  - new savepoint level is created and destroyed
2413 2414 2415 2416 2417 2418

  NOTES:
    Seed for random() is saved for the first! usage of RAND()
    We reset examined_row_count and cuted_fields and add these to the
    result to ensure that if we have a bug that would reset these within
    a function, we are not loosing any rows from the main statement.
2419 2420

    We do not reset value of last_insert_id().
2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431 2432 2433 2434
****************************************************************************/

void THD::reset_sub_statement_state(Sub_statement_state *backup,
                                    uint new_state)
{
  backup->options=         options;
  backup->in_sub_stmt=     in_sub_stmt;
  backup->no_send_ok=      net.no_send_ok;
  backup->enable_slow_log= enable_slow_log;
  backup->limit_found_rows= limit_found_rows;
  backup->examined_row_count= examined_row_count;
  backup->sent_row_count=   sent_row_count;
  backup->cuted_fields=     cuted_fields;
  backup->client_capabilities= client_capabilities;
2435
  backup->savepoints= transaction.savepoints;
2436 2437 2438 2439
  backup->first_successful_insert_id_in_prev_stmt= 
    first_successful_insert_id_in_prev_stmt;
  backup->first_successful_insert_id_in_cur_stmt= 
    first_successful_insert_id_in_cur_stmt;
2440

2441
  if ((!lex->requires_prelocking() || is_update_query(lex->sql_command)) &&
2442
      !current_stmt_binlog_row_based)
2443
  {
2444
    options&= ~OPTION_BIN_LOG;
2445
  }
2446 2447 2448 2449 2450

  if ((backup->options & OPTION_BIN_LOG) && is_update_query(lex->sql_command)&&
      !current_stmt_binlog_row_based)
    mysql_bin_log.start_union_events(this, this->query_id);

2451 2452 2453 2454 2455 2456
  /* Disable result sets */
  client_capabilities &= ~CLIENT_MULTI_RESULTS;
  in_sub_stmt|= new_state;
  examined_row_count= 0;
  sent_row_count= 0;
  cuted_fields= 0;
2457
  transaction.savepoints= 0;
2458
  first_successful_insert_id_in_cur_stmt= 0;
2459 2460 2461 2462 2463 2464 2465 2466

  /* Surpress OK packets in case if we will execute statements */
  net.no_send_ok= TRUE;
}


void THD::restore_sub_statement_state(Sub_statement_state *backup)
{
2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481
  /*
    To save resources we want to release savepoints which were created
    during execution of function or trigger before leaving their savepoint
    level. It is enough to release first savepoint set on this level since
    all later savepoints will be released automatically.
  */
  if (transaction.savepoints)
  {
    SAVEPOINT *sv;
    for (sv= transaction.savepoints; sv->prev; sv= sv->prev)
    {}
    /* ha_release_savepoint() never returns error. */
    (void)ha_release_savepoint(this, sv);
  }
  transaction.savepoints= backup->savepoints;
2482 2483 2484 2485
  options=          backup->options;
  in_sub_stmt=      backup->in_sub_stmt;
  net.no_send_ok=   backup->no_send_ok;
  enable_slow_log=  backup->enable_slow_log;
2486 2487 2488 2489
  first_successful_insert_id_in_prev_stmt= 
    backup->first_successful_insert_id_in_prev_stmt;
  first_successful_insert_id_in_cur_stmt= 
    backup->first_successful_insert_id_in_cur_stmt;
2490 2491 2492 2493
  limit_found_rows= backup->limit_found_rows;
  sent_row_count=   backup->sent_row_count;
  client_capabilities= backup->client_capabilities;

2494 2495 2496
  if ((options & OPTION_BIN_LOG) && is_update_query(lex->sql_command) &&
    !current_stmt_binlog_row_based)
    mysql_bin_log.stop_union_events(this);
2497

2498 2499 2500 2501 2502 2503 2504
  /*
    The following is added to the old values as we are interested in the
    total complexity of the query
  */
  examined_row_count+= backup->examined_row_count;
  cuted_fields+=       backup->cuted_fields;
}
2505 2506 2507 2508 2509 2510


/***************************************************************************
  Handling of XA id cacheing
***************************************************************************/

2511 2512 2513 2514 2515 2516
pthread_mutex_t LOCK_xid_cache;
HASH xid_cache;

static byte *xid_get_hash_key(const byte *ptr,uint *length,
                                  my_bool not_used __attribute__((unused)))
{
2517 2518
  *length=((XID_STATE*)ptr)->xid.key_length();
  return ((XID_STATE*)ptr)->xid.key();
2519 2520 2521 2522 2523
}

static void xid_free_hash (void *ptr)
{
  if (!((XID_STATE*)ptr)->in_thd)
kent@mysql.com's avatar
kent@mysql.com committed
2524
    my_free((gptr)ptr, MYF(0));
2525 2526 2527 2528 2529
}

bool xid_cache_init()
{
  pthread_mutex_init(&LOCK_xid_cache, MY_MUTEX_INIT_FAST);
serg@sergbook.mysql.com's avatar
serg@sergbook.mysql.com committed
2530 2531
  return hash_init(&xid_cache, &my_charset_bin, 100, 0, 0,
                   xid_get_hash_key, xid_free_hash, 0) != 0;
2532 2533 2534 2535 2536 2537 2538 2539 2540 2541 2542 2543 2544 2545
}

void xid_cache_free()
{
  if (hash_inited(&xid_cache))
  {
    hash_free(&xid_cache);
    pthread_mutex_destroy(&LOCK_xid_cache);
  }
}

XID_STATE *xid_cache_search(XID *xid)
{
  pthread_mutex_lock(&LOCK_xid_cache);
2546
  XID_STATE *res=(XID_STATE *)hash_search(&xid_cache, xid->key(), xid->key_length());
2547 2548 2549 2550
  pthread_mutex_unlock(&LOCK_xid_cache);
  return res;
}

2551

2552 2553 2554 2555 2556
bool xid_cache_insert(XID *xid, enum xa_states xa_state)
{
  XID_STATE *xs;
  my_bool res;
  pthread_mutex_lock(&LOCK_xid_cache);
2557
  if (hash_search(&xid_cache, xid->key(), xid->key_length()))
2558 2559 2560 2561 2562 2563 2564 2565 2566 2567 2568 2569 2570 2571
    res=0;
  else if (!(xs=(XID_STATE *)my_malloc(sizeof(*xs), MYF(MY_WME))))
    res=1;
  else
  {
    xs->xa_state=xa_state;
    xs->xid.set(xid);
    xs->in_thd=0;
    res=my_hash_insert(&xid_cache, (byte*)xs);
  }
  pthread_mutex_unlock(&LOCK_xid_cache);
  return res;
}

2572

2573 2574 2575
bool xid_cache_insert(XID_STATE *xid_state)
{
  pthread_mutex_lock(&LOCK_xid_cache);
2576 2577
  DBUG_ASSERT(hash_search(&xid_cache, xid_state->xid.key(),
                          xid_state->xid.key_length())==0);
2578 2579 2580 2581 2582
  my_bool res=my_hash_insert(&xid_cache, (byte*)xid_state);
  pthread_mutex_unlock(&LOCK_xid_cache);
  return res;
}

2583

2584 2585 2586 2587 2588 2589 2590
void xid_cache_delete(XID_STATE *xid_state)
{
  pthread_mutex_lock(&LOCK_xid_cache);
  hash_delete(&xid_cache, (byte *)xid_state);
  pthread_mutex_unlock(&LOCK_xid_cache);
}

2591 2592 2593 2594 2595 2596 2597 2598 2599 2600 2601 2602 2603 2604 2605 2606 2607 2608 2609 2610 2611 2612 2613 2614 2615 2616 2617 2618 2619 2620 2621 2622 2623 2624
/*
  Implementation of interface to write rows to the binary log through the
  thread.  The thread is responsible for writing the rows it has
  inserted/updated/deleted.
*/

#ifndef MYSQL_CLIENT

/*
  Template member function for ensuring that there is an rows log
  event of the apropriate type before proceeding.

  PRE CONDITION:
    - Events of type 'RowEventT' have the type code 'type_code'.
    
  POST CONDITION:
    If a non-NULL pointer is returned, the pending event for thread 'thd' will
    be an event of type 'RowEventT' (which have the type code 'type_code')
    will either empty or have enough space to hold 'needed' bytes.  In
    addition, the columns bitmap will be correct for the row, meaning that
    the pending event will be flushed if the columns in the event differ from
    the columns suppled to the function.

  RETURNS
    If no error, a non-NULL pending event (either one which already existed or
    the newly created one).
    If error, NULL.
 */

template <class RowsEventT> Rows_log_event* 
THD::binlog_prepare_pending_rows_event(TABLE* table, uint32 serv_id,
                                       MY_BITMAP const* cols,
                                       my_size_t colcnt,
                                       my_size_t needed,
2625 2626
                                       bool is_transactional,
				       RowsEventT *hint __attribute__((unused)))
2627
{
2628
  DBUG_ENTER("binlog_prepare_pending_rows_event");
2629
  /* Pre-conditions */
2630
  DBUG_ASSERT(table->s->table_map_id != ~0UL);
2631 2632 2633 2634 2635 2636 2637 2638 2639

  /* Fetch the type code for the RowsEventT template parameter */
  int const type_code= RowsEventT::TYPE_CODE;

  /*
    There is no good place to set up the transactional data, so we
    have to do it here.
  */
  if (binlog_setup_trx_data())
2640
    DBUG_RETURN(NULL);
2641 2642 2643 2644

  Rows_log_event* pending= binlog_get_pending_rows_event();

  if (unlikely(pending && !pending->is_valid()))
2645
    DBUG_RETURN(NULL);
2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 2656 2657 2658 2659 2660 2661 2662 2663 2664 2665 2666 2667 2668 2669

  /*
    Check if the current event is non-NULL and a write-rows
    event. Also check if the table provided is mapped: if it is not,
    then we have switched to writing to a new table.
    If there is no pending event, we need to create one. If there is a pending
    event, but it's not about the same table id, or not of the same type
    (between Write, Update and Delete), or not the same affected columns, or
    going to be too big, flush this event to disk and create a new pending
    event.
  */
  if (!pending ||
      pending->server_id != serv_id || 
      pending->get_table_id() != table->s->table_map_id ||
      pending->get_type_code() != type_code || 
      pending->get_data_size() + needed > opt_binlog_rows_event_max_size || 
      pending->get_width() != colcnt ||
      !bitmap_cmp(pending->get_cols(), cols)) 
  {
    /* Create a new RowsEventT... */
    Rows_log_event* const
	ev= new RowsEventT(this, table, table->s->table_map_id, cols,
                           is_transactional);
    if (unlikely(!ev))
2670
      DBUG_RETURN(NULL);
2671 2672 2673 2674 2675 2676 2677 2678
    ev->server_id= serv_id; // I don't like this, it's too easy to forget.
    /*
      flush the pending event and replace it with the newly created
      event...
    */
    if (unlikely(mysql_bin_log.flush_and_set_pending_rows_event(this, ev)))
    {
      delete ev;
2679
      DBUG_RETURN(NULL);
2680 2681
    }

2682
    DBUG_RETURN(ev);               /* This is the new pending event */
2683
  }
2684
  DBUG_RETURN(pending);        /* This is the current pending event */
2685 2686
}

2687
#ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
2688
/*
2689
  Instantiate the versions we need, we have -fno-implicit-template as
2690 2691 2692
  compiling option.
*/
template Rows_log_event*
2693 2694 2695
THD::binlog_prepare_pending_rows_event(TABLE*, uint32, MY_BITMAP const*,
				       my_size_t, my_size_t, bool,
				       Write_rows_log_event*);
2696 2697

template Rows_log_event*
2698 2699 2700
THD::binlog_prepare_pending_rows_event(TABLE*, uint32, MY_BITMAP const*,
				       my_size_t colcnt, my_size_t, bool,
				       Delete_rows_log_event *);
2701 2702

template Rows_log_event* 
2703 2704 2705
THD::binlog_prepare_pending_rows_event(TABLE*, uint32, MY_BITMAP const*,
				       my_size_t colcnt, my_size_t, bool,
				       Update_rows_log_event *);
2706
#endif
2707 2708

#ifdef NOT_USED
2709 2710 2711
static char const* 
field_type_name(enum_field_types type) 
{
2712
  switch (type) {
2713 2714 2715 2716 2717 2718 2719 2720 2721 2722 2723 2724 2725 2726 2727 2728 2729 2730 2731 2732 2733 2734 2735 2736 2737 2738 2739 2740 2741 2742 2743 2744 2745 2746 2747 2748 2749 2750 2751 2752 2753 2754 2755 2756 2757 2758 2759 2760 2761 2762 2763 2764 2765 2766 2767 2768 2769
  case MYSQL_TYPE_DECIMAL:
    return "MYSQL_TYPE_DECIMAL";
  case MYSQL_TYPE_TINY:
    return "MYSQL_TYPE_TINY";
  case MYSQL_TYPE_SHORT:
    return "MYSQL_TYPE_SHORT";
  case MYSQL_TYPE_LONG:
    return "MYSQL_TYPE_LONG";
  case MYSQL_TYPE_FLOAT:
    return "MYSQL_TYPE_FLOAT";
  case MYSQL_TYPE_DOUBLE:
    return "MYSQL_TYPE_DOUBLE";
  case MYSQL_TYPE_NULL:
    return "MYSQL_TYPE_NULL";
  case MYSQL_TYPE_TIMESTAMP:
    return "MYSQL_TYPE_TIMESTAMP";
  case MYSQL_TYPE_LONGLONG:
    return "MYSQL_TYPE_LONGLONG";
  case MYSQL_TYPE_INT24:
    return "MYSQL_TYPE_INT24";
  case MYSQL_TYPE_DATE:
    return "MYSQL_TYPE_DATE";
  case MYSQL_TYPE_TIME:
    return "MYSQL_TYPE_TIME";
  case MYSQL_TYPE_DATETIME:
    return "MYSQL_TYPE_DATETIME";
  case MYSQL_TYPE_YEAR:
    return "MYSQL_TYPE_YEAR";
  case MYSQL_TYPE_NEWDATE:
    return "MYSQL_TYPE_NEWDATE";
  case MYSQL_TYPE_VARCHAR:
    return "MYSQL_TYPE_VARCHAR";
  case MYSQL_TYPE_BIT:
    return "MYSQL_TYPE_BIT";
  case MYSQL_TYPE_NEWDECIMAL:
    return "MYSQL_TYPE_NEWDECIMAL";
  case MYSQL_TYPE_ENUM:
    return "MYSQL_TYPE_ENUM";
  case MYSQL_TYPE_SET:
    return "MYSQL_TYPE_SET";
  case MYSQL_TYPE_TINY_BLOB:
    return "MYSQL_TYPE_TINY_BLOB";
  case MYSQL_TYPE_MEDIUM_BLOB:
    return "MYSQL_TYPE_MEDIUM_BLOB";
  case MYSQL_TYPE_LONG_BLOB:
    return "MYSQL_TYPE_LONG_BLOB";
  case MYSQL_TYPE_BLOB:
    return "MYSQL_TYPE_BLOB";
  case MYSQL_TYPE_VAR_STRING:
    return "MYSQL_TYPE_VAR_STRING";
  case MYSQL_TYPE_STRING:
    return "MYSQL_TYPE_STRING";
  case MYSQL_TYPE_GEOMETRY:
    return "MYSQL_TYPE_GEOMETRY";
  }
  return "Unknown";
}
2770
#endif
2771

2772

2773 2774 2775 2776 2777 2778 2779 2780 2781 2782
my_size_t THD::max_row_length_blob(TABLE *table, const byte *data) const
{
  my_size_t length= 0;
  TABLE_SHARE *table_s= table->s;
  uint* const beg= table_s->blob_field;
  uint* const end= beg + table_s->blob_fields;

  for (uint *ptr= beg ; ptr != end ; ++ptr)
  {
    Field_blob* const blob= (Field_blob*) table->field[*ptr];
2783 2784 2785
    length+= blob->get_length((const char*) (data +
                                             blob->offset(table->record[0]))) +
      HA_KEY_BLOB_LENGTH;
2786 2787 2788 2789 2790
  }

  return length;
}

2791

2792

2793

2794 2795 2796 2797 2798 2799 2800 2801 2802 2803 2804 2805 2806 2807 2808 2809 2810 2811 2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 2824 2825
namespace {
  /**
     Class to handle temporary allocation of memory for row data.

     The responsibilities of the class is to provide memory for
     packing one or two rows of packed data (depending on what
     constructor is called).

     In order to make the allocation more efficient for "simple" rows,
     i.e., rows that do not contain any blobs, a pointer to the
     allocated memory is of memory is stored in the table structure
     for simple rows.  If memory for a table containing a blob field
     is requested, only memory for that is allocated, and subsequently
     released when the object is destroyed.

   */
  class Row_data_memory {
  public:
    /**
      Build an object to keep track of a block-local piece of memory
      for storing a row of data.

      @param table
      Table where the pre-allocated memory is stored.

      @param length
      Length of data that is needed, if the record contain blobs.
     */
    Row_data_memory(TABLE *table, my_size_t const len1)
      : m_memory(0)
    {
#ifndef DBUG_OFF
2826
      m_alloc_checked= FALSE;
2827 2828 2829 2830 2831 2832 2833 2834 2835 2836
#endif
      allocate_memory(table, len1);
      m_ptr[0]= has_memory() ? m_memory : 0;
      m_ptr[1]= 0;
    }

    Row_data_memory(TABLE *table, my_size_t const len1, my_size_t const len2)
      : m_memory(0)
    {
#ifndef DBUG_OFF
2837
      m_alloc_checked= FALSE;
2838 2839 2840 2841 2842 2843 2844 2845 2846 2847 2848 2849 2850 2851 2852 2853 2854 2855 2856 2857
#endif
      allocate_memory(table, len1 + len2);
      m_ptr[0]= has_memory() ? m_memory        : 0;
      m_ptr[1]= has_memory() ? m_memory + len1 : 0;
    }

    ~Row_data_memory()
    {
      if (m_memory != 0 && m_release_memory_on_destruction)
        my_free((gptr) m_memory, MYF(MY_WME));
    }

    /**
       Is there memory allocated?

       @retval true There is memory allocated
       @retval false Memory allocation failed
     */
    bool has_memory() const {
#ifndef DBUG_OFF
2858
      m_alloc_checked= TRUE;
2859 2860 2861 2862
#endif
      return m_memory != 0;
    }

2863
    byte *slot(uint s)
2864
    {
2865
      DBUG_ASSERT(s < sizeof(m_ptr)/sizeof(*m_ptr));
2866
      DBUG_ASSERT(m_ptr[s] != 0);
2867
      DBUG_ASSERT(m_alloc_checked == TRUE);
2868 2869 2870 2871 2872 2873 2874 2875 2876 2877 2878 2879 2880 2881 2882 2883 2884 2885 2886 2887 2888 2889 2890 2891 2892 2893 2894 2895 2896
      return m_ptr[s];
    }

  private:
    void allocate_memory(TABLE *const table, my_size_t const total_length)
    {
      if (table->s->blob_fields == 0)
      {
        /*
          The maximum length of a packed record is less than this
          length. We use this value instead of the supplied length
          when allocating memory for records, since we don't know how
          the memory will be used in future allocations.

          Since table->s->reclength is for unpacked records, we have
          to add two bytes for each field, which can potentially be
          added to hold the length of a packed field.
        */
        my_size_t const maxlen= table->s->reclength + 2 * table->s->fields;

        /*
          Allocate memory for two records if memory hasn't been
          allocated. We allocate memory for two records so that it can
          be used when processing update rows as well.
        */
        if (table->write_row_record == 0)
          table->write_row_record=
            (byte *) alloc_root(&table->mem_root, 2 * maxlen);
        m_memory= table->write_row_record;
2897
        m_release_memory_on_destruction= FALSE;
2898 2899 2900 2901
      }
      else
      {
        m_memory= (byte *) my_malloc(total_length, MYF(MY_WME));
2902
        m_release_memory_on_destruction= TRUE;
2903 2904 2905 2906 2907 2908 2909 2910 2911 2912 2913 2914 2915
      }
    }

#ifndef DBUG_OFF
    mutable bool m_alloc_checked;
#endif
    bool m_release_memory_on_destruction;
    byte *m_memory;
    byte *m_ptr[2];
  };
}


2916 2917 2918 2919
int THD::binlog_write_row(TABLE* table, bool is_trans, 
                          MY_BITMAP const* cols, my_size_t colcnt, 
                          byte const *record) 
{ 
2920
  DBUG_ASSERT(current_stmt_binlog_row_based && mysql_bin_log.is_open());
2921

2922 2923 2924
  /*
    Pack records into format for transfer. We are allocating more
    memory than needed, but that doesn't matter.
2925
  */
2926 2927 2928
  Row_data_memory memory(table, max_row_length(table, record));
  if (!memory.has_memory())
    return HA_ERR_OUT_OF_MEM;
2929

2930
  byte *row_data= memory.slot(0);
2931

2932
  my_size_t const len= pack_row(table, cols, row_data, record);
2933

2934 2935 2936 2937 2938 2939 2940 2941 2942
  Rows_log_event* const ev=
    binlog_prepare_pending_rows_event(table, server_id, cols, colcnt,
                                      len, is_trans,
                                      static_cast<Write_rows_log_event*>(0));

  if (unlikely(ev == 0))
    return HA_ERR_OUT_OF_MEM;

  return ev->add_row_data(row_data, len);
2943 2944 2945 2946 2947 2948 2949
}

int THD::binlog_update_row(TABLE* table, bool is_trans,
                           MY_BITMAP const* cols, my_size_t colcnt,
                           const byte *before_record,
                           const byte *after_record)
{ 
2950
  DBUG_ASSERT(current_stmt_binlog_row_based && mysql_bin_log.is_open());
2951 2952 2953 2954

  my_size_t const before_maxlen = max_row_length(table, before_record);
  my_size_t const after_maxlen  = max_row_length(table, after_record);

2955 2956 2957 2958 2959 2960
  Row_data_memory row_data(table, before_maxlen, after_maxlen);
  if (!row_data.has_memory())
    return HA_ERR_OUT_OF_MEM;

  byte *before_row= row_data.slot(0);
  byte *after_row= row_data.slot(1);
2961

2962
  my_size_t const before_size= pack_row(table, cols, before_row,
2963
                                        before_record);
2964
  my_size_t const after_size= pack_row(table, cols, after_row,
2965
                                       after_record);
2966 2967 2968 2969 2970 2971

  /*
    Don't print debug messages when running valgrind since they can
    trigger false warnings.
   */
#ifndef HAVE_purify
2972 2973 2974 2975
  DBUG_DUMP("before_record", (const char *)before_record, table->s->reclength);
  DBUG_DUMP("after_record", (const char *)after_record, table->s->reclength);
  DBUG_DUMP("before_row", (const char *)before_row, before_size);
  DBUG_DUMP("after_row", (const char *)after_row, after_size);
2976
#endif
2977

2978 2979 2980 2981
  Rows_log_event* const ev=
    binlog_prepare_pending_rows_event(table, server_id, cols, colcnt,
				      before_size + after_size, is_trans,
				      static_cast<Update_rows_log_event*>(0));
2982

2983 2984 2985 2986
  if (unlikely(ev == 0))
    return HA_ERR_OUT_OF_MEM;

  return
2987
    ev->add_row_data(before_row, before_size) ||
2988 2989 2990 2991 2992 2993 2994
    ev->add_row_data(after_row, after_size);
}

int THD::binlog_delete_row(TABLE* table, bool is_trans, 
                           MY_BITMAP const* cols, my_size_t colcnt,
                           byte const *record)
{ 
2995
  DBUG_ASSERT(current_stmt_binlog_row_based && mysql_bin_log.is_open());
2996 2997 2998 2999 3000

  /* 
     Pack records into format for transfer. We are allocating more
     memory than needed, but that doesn't matter.
  */
3001 3002
  Row_data_memory memory(table, max_row_length(table, record));
  if (unlikely(!memory.has_memory()))
3003
    return HA_ERR_OUT_OF_MEM;
3004 3005 3006

  byte *row_data= memory.slot(0);

3007 3008
  my_size_t const len= pack_row(table, cols, row_data, record);

3009 3010 3011 3012
  Rows_log_event* const ev=
    binlog_prepare_pending_rows_event(table, server_id, cols, colcnt,
				      len, is_trans,
				      static_cast<Delete_rows_log_event*>(0));
3013

3014 3015
  if (unlikely(ev == 0))
    return HA_ERR_OUT_OF_MEM;
3016

3017
  return ev->add_row_data(row_data, len);
3018 3019 3020 3021 3022 3023
}


int THD::binlog_flush_pending_rows_event(bool stmt_end)
{
  DBUG_ENTER("THD::binlog_flush_pending_rows_event");
3024 3025 3026 3027 3028 3029
  /*
    We shall flush the pending event even if we are not in row-based
    mode: it might be the case that we left row-based mode before
    flushing anything (e.g., if we have explicitly locked tables).
   */
  if (!mysql_bin_log.is_open())
3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042
    DBUG_RETURN(0);

  /*
    Mark the event as the last event of a statement if the stmt_end
    flag is set.
  */
  int error= 0;
  if (Rows_log_event *pending= binlog_get_pending_rows_event())
  {
    if (stmt_end)
    {
      pending->set_flags(Rows_log_event::STMT_END_F);
      pending->flags|= LOG_EVENT_UPDATE_TABLE_MAP_VERSION_F;
3043
      binlog_table_maps= 0;
3044 3045
    }

3046 3047
    error= mysql_bin_log.flush_and_set_pending_rows_event(this, 0);
  }
3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063

  DBUG_RETURN(error);
}


void THD::binlog_delete_pending_rows_event()
{
  if (Rows_log_event *pending= binlog_get_pending_rows_event())
  {
    delete pending;
    binlog_set_pending_rows_event(0);
  }
}

/*
  Member function that will log query, either row-based or
3064 3065
  statement-based depending on the value of the 'current_stmt_binlog_row_based'
  the value of the 'qtype' flag.
3066 3067 3068 3069 3070

  This function should be called after the all calls to ha_*_row()
  functions have been issued, but before tables are unlocked and
  closed.

3071 3072 3073 3074 3075 3076 3077 3078 3079 3080 3081
  OBSERVE
    There shall be no writes to any system table after calling
    binlog_query(), so these writes has to be moved to before the call
    of binlog_query() for correct functioning.

    This is necessesary not only for RBR, but the master might crash
    after binlogging the query but before changing the system tables.
    This means that the slave and the master are not in the same state
    (after the master has restarted), so therefore we have to
    eliminate this problem.

3082 3083 3084 3085 3086 3087 3088 3089
  RETURN VALUE
    Error code, or 0 if no error.
*/
int THD::binlog_query(THD::enum_binlog_query_type qtype,
                      char const *query, ulong query_len,
                      bool is_trans, bool suppress_use)
{
  DBUG_ENTER("THD::binlog_query");
3090
  DBUG_PRINT("enter", ("qtype=%d, query='%s'", qtype, query));
3091
  DBUG_ASSERT(query && mysql_bin_log.is_open());
3092

3093 3094 3095 3096 3097 3098 3099 3100 3101 3102 3103 3104 3105
  /*
    If we are not in prelocked mode, mysql_unlock_tables() will be
    called after this binlog_query(), so we have to flush the pending
    rows event with the STMT_END_F set to unlock all tables at the
    slave side as well.

    If we are in prelocked mode, the flushing will be done inside the
    top-most close_thread_tables().
  */
  if (this->prelocked_mode == NON_PRELOCKED)
    if (int error= binlog_flush_pending_rows_event(TRUE))
      DBUG_RETURN(error);

3106
  switch (qtype) {
3107 3108 3109 3110
  case THD::ROW_QUERY_TYPE:
    if (current_stmt_binlog_row_based)
      DBUG_RETURN(0);
    /* Otherwise, we fall through */
3111 3112 3113 3114 3115 3116
  case THD::MYSQL_QUERY_TYPE:
    /*
      Using this query type is a conveniece hack, since we have been
      moving back and forth between using RBR for replication of
      system tables and not using it.

3117
      Make sure to change in check_table_binlog_row_based() according
3118 3119 3120 3121
      to how you treat this.
    */
  case THD::STMT_QUERY_TYPE:
    /*
3122 3123
      The MYSQL_LOG::write() function will set the STMT_END_F flag and
      flush the pending rows event if necessary.
3124 3125 3126 3127
     */
    {
      Query_log_event qinfo(this, query, query_len, is_trans, suppress_use);
      qinfo.flags|= LOG_EVENT_UPDATE_TABLE_MAP_VERSION_F;
3128 3129 3130 3131 3132 3133 3134 3135 3136
      /*
        Binlog table maps will be irrelevant after a Query_log_event
        (they are just removed on the slave side) so after the query
        log event is written to the binary log, we pretend that no
        table maps were written.
       */
      int error= mysql_bin_log.write(&qinfo);
      binlog_table_maps= 0;
      DBUG_RETURN(error);
3137 3138 3139 3140 3141 3142 3143 3144 3145 3146
    }
    break;

  case THD::QUERY_TYPE_COUNT:
  default:
    DBUG_ASSERT(0 <= qtype && qtype < QUERY_TYPE_COUNT);
  }
  DBUG_RETURN(0);
}

3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168
bool Discrete_intervals_list::append(ulonglong start, ulonglong val,
                                 ulonglong incr)
{
  DBUG_ENTER("Discrete_intervals_list::append");
  /* first, see if this can be merged with previous */
  if ((head == NULL) || tail->merge_if_contiguous(start, val, incr))
  {
    /* it cannot, so need to add a new interval */
    Discrete_interval *new_interval= new Discrete_interval(start, val, incr);
    if (unlikely(new_interval == NULL)) // out of memory
      DBUG_RETURN(1);
    DBUG_PRINT("info",("adding new auto_increment interval"));
    if (head == NULL)
      head= current= new_interval;
    else
      tail->next= new_interval;
    tail= new_interval;
    elements++;
  }
  DBUG_RETURN(0);
}

3169
#endif /* !defined(MYSQL_CLIENT) */