sql_class.cc 136 KB
Newer Older
Marc Alff's avatar
Marc Alff committed
1
/* Copyright (C) 2000-2008 MySQL AB, 2008-2009 Sun Microsystems, Inc.
unknown's avatar
unknown committed
2

unknown's avatar
unknown 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
unknown's avatar
unknown committed
5
   the Free Software Foundation; version 2 of the License.
unknown's avatar
unknown committed
6

unknown's avatar
unknown 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.
unknown's avatar
unknown committed
11

unknown's avatar
unknown 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
unknown's avatar
unknown committed
25 26 27
#pragma implementation				// gcc: Class implementation
#endif

28
#include "my_global.h"                          /* NO_EMBEDDED_ACCESS_CHECKS */
29 30 31 32 33 34 35 36 37 38 39
#include "sql_priv.h"
#include "unireg.h"                    // REQUIRED: for other includes
#include "sql_class.h"
#include "lock.h"      // unlock_global_read_lock, mysql_unlock_tables
#include "sql_cache.h"                          // query_cache_abort
#include "sql_base.h"                           // close_thread_tables
#include "sql_time.h"                         // date_time_format_copy
#include "sql_acl.h"                          // NO_ACCESS,
                                              // acl_getroot_no_password
#include "sql_base.h"                         // close_temporary_tables
#include "sql_handler.h"                      // mysql_ha_cleanup
40
#include "rpl_rli.h"
41
#include "rpl_filter.h"
unknown's avatar
unknown committed
42
#include "rpl_record.h"
43
#include "slave.h"
44 45
#include <my_bitmap.h>
#include "log_event.h"
46
#include "sql_audit.h"
unknown's avatar
unknown committed
47 48
#include <m_ctype.h>
#include <sys/stat.h>
49
#include <thr_alarm.h>
unknown's avatar
unknown committed
50 51 52
#ifdef	__WIN__
#include <io.h>
#endif
53
#include <mysys_err.h>
54
#include <limits.h>
unknown's avatar
unknown committed
55

unknown's avatar
unknown committed
56 57
#include "sp_rcontext.h"
#include "sp_cache.h"
Konstantin Osipov's avatar
Konstantin Osipov committed
58
#include "transaction.h"
59
#include "debug_sync.h"
60
#include "sql_parse.h"                          // is_update_query
61

62 63 64 65 66
/*
  The following is used to initialise Table_ident with a internal
  table name
*/
char internal_table_name[2]= "*";
67
char empty_c_string[1]= {0};    /* used for not defined db */
68

69 70
const char * const THD::DEFAULT_WHERE= "field list";

71

unknown's avatar
unknown committed
72 73 74 75
/*****************************************************************************
** Instansiate templates
*****************************************************************************/

76
#ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
unknown's avatar
unknown committed
77 78 79
/* Used templates */
template class List<Key>;
template class List_iterator<Key>;
unknown's avatar
unknown committed
80 81
template class List<Key_part_spec>;
template class List_iterator<Key_part_spec>;
unknown's avatar
unknown committed
82 83 84 85 86 87 88 89 90 91
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
****************************************************************************/

92 93
extern "C" uchar *get_var_key(user_var_entry *entry, size_t *length,
                              my_bool not_used __attribute__((unused)))
unknown's avatar
unknown committed
94
{
95 96
  *length= entry->name.length;
  return (uchar*) entry->name.str;
unknown's avatar
unknown committed
97 98
}

99
extern "C" void free_user_var(user_var_entry *entry)
unknown's avatar
unknown committed
100 101 102 103 104 105 106
{
  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));
}

unknown's avatar
unknown committed
107
bool Key_part_spec::operator==(const Key_part_spec& other) const
108
{
109
  return length == other.length &&
110 111
         !my_strcasecmp(system_charset_info, field_name.str,
                        other.field_name.str);
112 113
}

114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137
/**
  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.
*/

unknown's avatar
unknown committed
138
Foreign_key::Foreign_key(const Foreign_key &rhs, MEM_ROOT *mem_root)
139 140 141 142 143 144 145 146 147
  :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);
}
148 149

/*
150
  Test if a foreign key (= generated key) is a prefix of the given key
151 152 153 154 155 156 157 158 159 160 161 162 163 164
  (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)
165
{
166 167 168 169
  /* Ensure that 'a' is the generated key */
  if (a->generated)
  {
    if (b->generated && a->columns.elements > b->columns.elements)
170
      swap_variables(Key*, a, b);               // Put shorter key in 'a'
171 172
  }
  else
173
  {
174 175
    if (!b->generated)
      return TRUE;                              // No foreign key
176
    swap_variables(Key*, a, b);                 // Put generated key in 'a'
177 178 179 180 181 182
  }

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

unknown's avatar
unknown committed
183 184 185
  List_iterator<Key_part_spec> col_it1(a->columns);
  List_iterator<Key_part_spec> col_it2(b->columns);
  const Key_part_spec *col1, *col2;
186 187 188 189 190 191 192

#ifdef ENABLE_WHEN_INNODB_CAN_HANDLE_SWAPED_FOREIGN_KEY_COLUMNS
  while ((col1= col_it1++))
  {
    bool found= 0;
    col_it2.rewind();
    while ((col2= col_it2++))
193
    {
194 195 196 197 198
      if (*col1 == *col2)
      {
        found= TRUE;
	break;
      }
199
    }
200 201 202 203 204 205 206 207 208 209
    if (!found)
      return TRUE;                              // Error
  }
  return FALSE;                                 // Is prefix
#else
  while ((col1= col_it1++))
  {
    col2= col_it2++;
    if (!(*col1 == *col2))
      return TRUE;
210
  }
211 212
  return FALSE;                                 // Is prefix
#endif
213 214 215
}


unknown's avatar
unknown committed
216 217 218
/****************************************************************************
** Thread specific functions
****************************************************************************/
219

unknown's avatar
unknown committed
220 221 222 223
/*
  The following functions form part of the C plugin API
*/

224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248
extern "C" int mysql_tmpfile(const char *prefix)
{
  char filename[FN_REFLEN];
  File fd = create_temp_file(filename, mysql_tmpdir, prefix,
#ifdef __WIN__
                             O_BINARY | O_TRUNC | O_SEQUENTIAL |
                             O_SHORT_LIVED |
#endif /* __WIN__ */
                             O_CREAT | O_EXCL | O_RDWR | O_TEMPORARY,
                             MYF(MY_WME));
  if (fd >= 0) {
#ifndef __WIN__
    /*
      This can be removed once the following bug is fixed:
      Bug #28903  create_temp_file() doesn't honor O_TEMPORARY option
                  (file not removed) (Unix)
    */
    unlink(filename);
#endif /* !__WIN__ */
  }

  return fd;
}


unknown's avatar
unknown committed
249
extern "C"
unknown's avatar
unknown committed
250
int thd_in_lock_tables(const THD *thd)
251
{
unknown's avatar
unknown committed
252
  return test(thd->in_lock_tables);
253 254 255
}


unknown's avatar
unknown committed
256
extern "C"
unknown's avatar
unknown committed
257
int thd_tablespace_op(const THD *thd)
258
{
unknown's avatar
unknown committed
259
  return test(thd->tablespace_op);
260 261 262
}


unknown's avatar
unknown committed
263
extern "C"
Konstantin Osipov's avatar
Konstantin Osipov committed
264 265 266
const char *set_thd_proc_info(THD *thd, const char *info,
                              const char *calling_function,
                              const char *calling_file,
267
                              const unsigned int calling_line)
268
{
Konstantin Osipov's avatar
Konstantin Osipov committed
269 270 271
  if (!thd)
    thd= current_thd;

272
  const char *old_info= thd->proc_info;
Konstantin Osipov's avatar
Konstantin Osipov committed
273
  DBUG_PRINT("proc_info", ("%s:%d  %s", calling_file, calling_line,
274
                           (info != NULL) ? info : "(null)"));
275
#if defined(ENABLED_PROFILING)
276 277
  thd->profiling.status_change(info, calling_function, calling_file, calling_line);
#endif
278 279 280 281
  thd->proc_info= info;
  return old_info;
}

He Zhenxing's avatar
He Zhenxing committed
282
extern "C"
Marc Alff's avatar
Marc Alff committed
283 284
const char* thd_enter_cond(MYSQL_THD thd, mysql_cond_t *cond,
                           mysql_mutex_t *mutex, const char *msg)
He Zhenxing's avatar
He Zhenxing committed
285 286 287 288
{
  if (!thd)
    thd= current_thd;

289
  return thd->enter_cond(cond, mutex, msg);
He Zhenxing's avatar
He Zhenxing committed
290 291 292 293 294 295 296 297
}

extern "C"
void thd_exit_cond(MYSQL_THD thd, const char *old_msg)
{
  if (!thd)
    thd= current_thd;

298
  thd->exit_cond(old_msg);
He Zhenxing's avatar
He Zhenxing committed
299 300 301
  return;
}

unknown's avatar
unknown committed
302
extern "C"
unknown's avatar
unknown committed
303 304
void **thd_ha_data(const THD *thd, const struct handlerton *hton)
{
305
  return (void **) &thd->ha_data[hton->slot].ha_ptr;
unknown's avatar
unknown committed
306 307
}

308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338

/**
  Provide a handler data getter to simplify coding
*/
extern "C"
void *thd_get_ha_data(const THD *thd, const struct handlerton *hton)
{
  return *thd_ha_data(thd, hton);
}


/**
  Provide a handler data setter to simplify coding
  @see thd_set_ha_data() definition in plugin.h
*/
extern "C"
void thd_set_ha_data(THD *thd, const struct handlerton *hton,
                     const void *ha_data)
{
  plugin_ref *lock= &thd->ha_data[hton->slot].lock;
  if (ha_data && !*lock)
    *lock= ha_lock_engine(NULL, (handlerton*) hton);
  else if (!ha_data && *lock)
  {
    plugin_unlock(NULL, *lock);
    *lock= NULL;
  }
  *thd_ha_data(thd, hton)= (void*) ha_data;
}


unknown's avatar
unknown committed
339
extern "C"
unknown's avatar
unknown committed
340 341
long long thd_test_options(const THD *thd, long long test_options)
{
342
  return thd->variables.option_bits & test_options;
unknown's avatar
unknown committed
343 344
}

unknown's avatar
unknown committed
345
extern "C"
unknown's avatar
unknown committed
346 347 348 349 350
int thd_sql_command(const THD *thd)
{
  return (int) thd->lex->sql_command;
}

351 352 353 354 355 356
extern "C"
int thd_tx_isolation(const THD *thd)
{
  return (int) thd->variables.tx_isolation;
}

357 358 359
extern "C"
void thd_inc_row_count(THD *thd)
{
Marc Alff's avatar
Marc Alff committed
360
  thd->warning_info->inc_current_row_for_warning();
361
}
unknown's avatar
unknown committed
362

363 364

/**
unknown's avatar
unknown committed
365 366
  Dumps a text description of a thread, its security context
  (user, host) and the current query.
367

368
  @param thd thread context
369 370 371 372 373 374 375 376 377 378 379
  @param buffer pointer to preferred result buffer
  @param length length of buffer
  @param max_query_len how many chars of query to copy (0 for all)

  @req LOCK_thread_count
  
  @note LOCK_thread_count mutex is not necessary when the function is invoked on
   the currently running thread (current_thd) or if the caller in some other
   way guarantees that access to thd->query is serialized.
 
  @return Pointer to string
unknown's avatar
unknown committed
380
*/
381

unknown's avatar
unknown committed
382
extern "C"
unknown's avatar
unknown committed
383 384
char *thd_security_context(THD *thd, char *buffer, unsigned int length,
                           unsigned int max_query_len)
unknown's avatar
unknown committed
385 386 387 388 389
{
  String str(buffer, length, &my_charset_latin1);
  const Security_context *sctx= &thd->main_security_ctx;
  char header[64];
  int len;
390 391 392 393 394 395 396 397 398 399
  /*
    The pointers thd->query and thd->proc_info might change since they are
    being modified concurrently. This is acceptable for proc_info since its
    values doesn't have to very accurate and the memory it points to is static,
    but we need to attempt a snapshot on the pointer values to avoid using NULL
    values. The pointer to thd->query however, doesn't point to static memory
    and has to be protected by LOCK_thread_count or risk pointing to
    uninitialized memory.
  */
  const char *proc_info= thd->proc_info;
400 401

  len= my_snprintf(header, sizeof(header),
unknown's avatar
unknown committed
402 403 404 405
                   "MySQL thread id %lu, query id %lu",
                   thd->thread_id, (ulong) thd->query_id);
  str.length(0);
  str.append(header, len);
406

unknown's avatar
unknown committed
407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424
  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);
  }

425
  if (proc_info)
unknown's avatar
unknown committed
426 427
  {
    str.append(' ');
428
    str.append(proc_info);
unknown's avatar
unknown committed
429 430
  }

Marc Alff's avatar
Marc Alff committed
431
  mysql_mutex_lock(&thd->LOCK_thd_data);
432

433
  if (thd->query())
unknown's avatar
unknown committed
434 435
  {
    if (max_query_len < 1)
436
      len= thd->query_length();
unknown's avatar
unknown committed
437
    else
438
      len= min(thd->query_length(), max_query_len);
unknown's avatar
unknown committed
439
    str.append('\n');
440
    str.append(thd->query(), len);
unknown's avatar
unknown committed
441
  }
442

Marc Alff's avatar
Marc Alff committed
443
  mysql_mutex_unlock(&thd->LOCK_thd_data);
444

unknown's avatar
unknown committed
445 446
  if (str.c_ptr_safe() == buffer)
    return buffer;
447 448 449 450 451 452 453 454 455 456 457

  /*
    We have to copy the new string to the destination buffer because the string
    was reallocated to a larger buffer to be able to fit.
  */
  DBUG_ASSERT(buffer != NULL);
  length= min(str.length(), length-1);
  memcpy(buffer, str.c_ptr_quick(), length);
  /* Make sure that the new string is null terminated */
  buffer[length]= '\0';
  return buffer;
unknown's avatar
unknown committed
458
}
459

unknown's avatar
unknown committed
460

461
/**
462
  Implementation of Drop_table_error_handler::handle_condition().
463 464 465 466 467 468 469 470 471 472 473 474
  The reason in having this implementation is to silence technical low-level
  warnings during DROP TABLE operation. Currently we don't want to expose
  the following warnings during DROP TABLE:
    - Some of table files are missed or invalid (the table is going to be
      deleted anyway, so why bother that something was missed);
    - A trigger associated with the table does not have DEFINER (One of the
      MySQL specifics now is that triggers are loaded for the table being
      dropped. So, we may have a warning that trigger does not have DEFINER
      attribute during DROP TABLE operation).

  @return TRUE if the condition is handled.
*/
475 476 477 478 479 480 481 482
bool Drop_table_error_handler::handle_condition(THD *thd,
                                                uint sql_errno,
                                                const char* sqlstate,
                                                MYSQL_ERROR::enum_warning_level level,
                                                const char* msg,
                                                MYSQL_ERROR ** cond_hdl)
{
  *cond_hdl= NULL;
483 484 485 486 487
  return ((sql_errno == EE_DELETE && my_errno == ENOENT) ||
          sql_errno == ER_TRG_NO_DEFINER);
}


488
THD::THD()
489 490
   :Statement(&main_lex, &main_mem_root, CONVENTIONAL_EXECUTION,
              /* statement id */ 0),
Konstantin Osipov's avatar
Konstantin Osipov committed
491
   rli_fake(0),
492
   lock_id(&main_lock_id),
493
   user_time(0), in_sub_stmt(0),
494
   sql_log_bin_toplevel(false),
495
   binlog_unsafe_warning_flags(0), binlog_table_maps(0),
He Zhenxing's avatar
He Zhenxing committed
496
   table_map_for_update(0),
497 498 499 500 501
   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),
502
   examined_row_count(0),
Marc Alff's avatar
Marc Alff committed
503 504
   warning_info(&main_warning_info),
   stmt_da(&main_da),
unknown's avatar
unknown committed
505
   is_fatal_error(0),
unknown's avatar
unknown committed
506 507
   transaction_rollback_request(0),
   is_fatal_sub_stmt_error(0),
unknown's avatar
unknown committed
508 509 510 511 512
   rand_used(0),
   time_zone_used(0),
   in_lock_tables(0),
   bootstrap(0),
   derived_tables_processing(FALSE),
513
   spcont(NULL),
Marc Alff's avatar
Marc Alff committed
514
   m_parser_state(NULL),
515
#if defined(ENABLED_DEBUG_SYNC)
516
   debug_sync_control(0),
517
#endif /* defined(ENABLED_DEBUG_SYNC) */
Konstantin Osipov's avatar
Konstantin Osipov committed
518
   main_warning_info(0)
unknown's avatar
unknown committed
519
{
520 521
  ulong tmp;

522
  mdl_context.init(this);
523 524 525 526 527 528
  /*
    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);
unknown's avatar
unknown committed
529
  stmt_arena= this;
530
  thread_stack= 0;
531
  catalog= (char*)"std"; // the only catalog we have for now
532 533
  main_security_ctx.init();
  security_ctx= &main_security_ctx;
534
  no_errors=password= 0;
unknown's avatar
unknown committed
535
  query_start_used= 0;
536
  count_cuted_fields= CHECK_FIELD_IGNORE;
unknown's avatar
SCRUM  
unknown committed
537
  killed= NOT_KILLED;
538
  col_access=0;
539
  is_slave_error= thread_specific_used= thread_temporary_used= FALSE;
Konstantin Osipov's avatar
Konstantin Osipov committed
540
  my_hash_clear(&handler_tables_hash);
unknown's avatar
unknown committed
541
  tmp_table=0;
542
  used_tables=0;
Marc Alff's avatar
Marc Alff committed
543 544
  cuted_fields= 0L;
  sent_row_count= 0L;
545
  limit_found_rows= 0;
546
  row_count_func= -1;
547
  statement_id_counter= 0UL;
548
  // Must be reset to handle error with THD's created for init of mysqld
unknown's avatar
unknown committed
549
  lex->current_select= 0;
unknown's avatar
unknown committed
550
  start_time=(time_t) 0;
551
  start_utime= prior_thr_create_utime= 0L;
552
  utime_after_lock= 0L;
unknown's avatar
unknown committed
553
  current_linfo =  0;
554
  slave_thread = 0;
unknown's avatar
unknown committed
555
  bzero(&variables, sizeof(variables));
556
  thread_id= 0;
557
  one_shot_set= 0;
558
  file_id = 0;
559
  query_id= 0;
560
  query_name_consts= 0;
561
  db_charset= global_system_variables.collation_database;
562
  bzero(ha_data, sizeof(ha_data));
unknown's avatar
unknown committed
563
  mysys_var=0;
564
  binlog_evt_union.do_union= FALSE;
565
  enable_slow_log= 0;
566 567
#ifndef DBUG_OFF
  dbug_sentry=THD_SENTRY_MAGIC;
568
#endif
569
#ifndef EMBEDDED_LIBRARY
570
  mysql_audit_init_thd(this);
unknown's avatar
unknown committed
571
  net.vio=0;
572
#endif
573
  client_capabilities= 0;                       // minimalistic client
unknown's avatar
unknown committed
574
  ull=0;
575 576
  system_thread= NON_SYSTEM_THREAD;
  cleanup_done= abort_on_warning= no_warnings_for_error= 0;
577
  peer_port= 0;					// For SHOW PROCESSLIST
578
  transaction.m_pending_rows_event= 0;
579
  transaction.on= 1;
unknown's avatar
unknown committed
580 581
#ifdef SIGNAL_WITH_VIO_CLOSE
  active_vio = 0;
582
#endif
Marc Alff's avatar
Marc Alff committed
583
  mysql_mutex_init(key_LOCK_thd_data, &LOCK_thd_data, MY_MUTEX_INIT_FAST);
unknown's avatar
unknown committed
584 585 586

  /* Variables with default values */
  proc_info="login";
587
  where= THD::DEFAULT_WHERE;
unknown's avatar
unknown committed
588
  server_id = ::server_id;
589
  slave_net = 0;
unknown's avatar
unknown committed
590
  command=COM_CONNECT;
unknown's avatar
unknown committed
591
  *scramble= '\0';
unknown's avatar
unknown committed
592

Konstantin Osipov's avatar
Konstantin Osipov committed
593 594 595
  /* Call to init() below requires fully initialized Open_tables_state. */
  init_open_tables_state(this, refresh_version);

unknown's avatar
unknown committed
596
  init();
597
#if defined(ENABLED_PROFILING)
unknown's avatar
unknown committed
598
  profiling.set_thd(this);
599
#endif
600
  user_connect=(USER_CONN *)0;
Konstantin Osipov's avatar
Konstantin Osipov committed
601 602 603
  my_hash_init(&user_vars, system_charset_info, USER_VARS_HASH_SIZE, 0, 0,
               (my_hash_get_key) get_var_key,
               (my_hash_free_key) free_user_var, 0);
604

605 606
  sp_proc_cache= NULL;
  sp_func_cache= NULL;
607

unknown's avatar
unknown committed
608 609 610
  /* For user vars replication*/
  if (opt_bin_log)
    my_init_dynamic_array(&user_var_events,
611
			  sizeof(BINLOG_USER_VAR_EVENT *), 16, 16);
unknown's avatar
unknown committed
612 613 614
  else
    bzero((char*) &user_var_events, sizeof(user_var_events));

615
  /* Protocol */
unknown's avatar
unknown committed
616 617 618
  protocol= &protocol_text;			// Default protocol
  protocol_text.init(this);
  protocol_binary.init(this);
619

unknown's avatar
unknown committed
620
  tablespace_op=FALSE;
621 622
  tmp= sql_rnd_with_mutex();
  randominit(&rand, tmp + (ulong) &rand, tmp + (ulong) ::global_query_id);
623
  substitute_null_with_insert_id = FALSE;
624 625
  thr_lock_info_init(&lock_info); /* safety: will be reset after start */
  thr_lock_owner_init(&main_lock_id, &lock_info);
626 627 628 629 630 631 632

  m_internal_handler= NULL;
}


void THD::push_internal_handler(Internal_error_handler *handler)
{
633 634 635 636 637 638 639 640 641
  if (m_internal_handler)
  {
    handler->m_prev_internal_handler= m_internal_handler;
    m_internal_handler= handler;
  }
  else
  {
    m_internal_handler= handler;
  }
642 643
}

Marc Alff's avatar
Marc Alff committed
644 645 646 647 648
bool THD::handle_condition(uint sql_errno,
                           const char* sqlstate,
                           MYSQL_ERROR::enum_warning_level level,
                           const char* msg,
                           MYSQL_ERROR ** cond_hdl)
649
{
650
  if (!m_internal_handler)
Marc Alff's avatar
Marc Alff committed
651 652
  {
    *cond_hdl= NULL;
653
    return FALSE;
Marc Alff's avatar
Marc Alff committed
654
  }
655 656 657

  for (Internal_error_handler *error_handler= m_internal_handler;
       error_handler;
658
       error_handler= error_handler->m_prev_internal_handler)
659
  {
660 661
    if (error_handler->handle_condition(this, sql_errno, sqlstate, level, msg,
					cond_hdl))
Marc Alff's avatar
Marc Alff committed
662 663 664
    {
      return TRUE;
    }
665 666
  }

667
  return FALSE;
668 669 670
}


671
Internal_error_handler *THD::pop_internal_handler()
672 673
{
  DBUG_ASSERT(m_internal_handler != NULL);
674
  Internal_error_handler *popped_handler= m_internal_handler;
675
  m_internal_handler= m_internal_handler->m_prev_internal_handler;
676
  return popped_handler;
unknown's avatar
unknown committed
677 678
}

Marc Alff's avatar
Marc Alff committed
679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735

void THD::raise_error(uint sql_errno)
{
  const char* msg= ER(sql_errno);
  (void) raise_condition(sql_errno,
                         NULL,
                         MYSQL_ERROR::WARN_LEVEL_ERROR,
                         msg);
}

void THD::raise_error_printf(uint sql_errno, ...)
{
  va_list args;
  char ebuff[MYSQL_ERRMSG_SIZE];
  DBUG_ENTER("THD::raise_error_printf");
  DBUG_PRINT("my", ("nr: %d  errno: %d", sql_errno, errno));
  const char* format= ER(sql_errno);
  va_start(args, sql_errno);
  my_vsnprintf(ebuff, sizeof(ebuff), format, args);
  va_end(args);
  (void) raise_condition(sql_errno,
                         NULL,
                         MYSQL_ERROR::WARN_LEVEL_ERROR,
                         ebuff);
  DBUG_VOID_RETURN;
}

void THD::raise_warning(uint sql_errno)
{
  const char* msg= ER(sql_errno);
  (void) raise_condition(sql_errno,
                         NULL,
                         MYSQL_ERROR::WARN_LEVEL_WARN,
                         msg);
}

void THD::raise_warning_printf(uint sql_errno, ...)
{
  va_list args;
  char    ebuff[MYSQL_ERRMSG_SIZE];
  DBUG_ENTER("THD::raise_warning_printf");
  DBUG_PRINT("enter", ("warning: %u", sql_errno));
  const char* format= ER(sql_errno);
  va_start(args, sql_errno);
  my_vsnprintf(ebuff, sizeof(ebuff), format, args);
  va_end(args);
  (void) raise_condition(sql_errno,
                         NULL,
                         MYSQL_ERROR::WARN_LEVEL_WARN,
                         ebuff);
  DBUG_VOID_RETURN;
}

void THD::raise_note(uint sql_errno)
{
  DBUG_ENTER("THD::raise_note");
  DBUG_PRINT("enter", ("code: %d", sql_errno));
736
  if (!(variables.option_bits & OPTION_SQL_NOTES))
Marc Alff's avatar
Marc Alff committed
737 738 739 740 741 742 743 744 745 746 747 748 749 750 751
    DBUG_VOID_RETURN;
  const char* msg= ER(sql_errno);
  (void) raise_condition(sql_errno,
                         NULL,
                         MYSQL_ERROR::WARN_LEVEL_NOTE,
                         msg);
  DBUG_VOID_RETURN;
}

void THD::raise_note_printf(uint sql_errno, ...)
{
  va_list args;
  char    ebuff[MYSQL_ERRMSG_SIZE];
  DBUG_ENTER("THD::raise_note_printf");
  DBUG_PRINT("enter",("code: %u", sql_errno));
752
  if (!(variables.option_bits & OPTION_SQL_NOTES))
Marc Alff's avatar
Marc Alff committed
753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772
    DBUG_VOID_RETURN;
  const char* format= ER(sql_errno);
  va_start(args, sql_errno);
  my_vsnprintf(ebuff, sizeof(ebuff), format, args);
  va_end(args);
  (void) raise_condition(sql_errno,
                         NULL,
                         MYSQL_ERROR::WARN_LEVEL_NOTE,
                         ebuff);
  DBUG_VOID_RETURN;
}

MYSQL_ERROR* THD::raise_condition(uint sql_errno,
                                  const char* sqlstate,
                                  MYSQL_ERROR::enum_warning_level level,
                                  const char* msg)
{
  MYSQL_ERROR *cond= NULL;
  DBUG_ENTER("THD::raise_condition");

773
  if (!(variables.option_bits & OPTION_SQL_NOTES) &&
Marc Alff's avatar
Marc Alff committed
774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870
      (level == MYSQL_ERROR::WARN_LEVEL_NOTE))
    DBUG_RETURN(NULL);

  warning_info->opt_clear_warning_info(query_id);

  /*
    TODO: replace by DBUG_ASSERT(sql_errno != 0) once all bugs similar to
    Bug#36768 are fixed: a SQL condition must have a real (!=0) error number
    so that it can be caught by handlers.
  */
  if (sql_errno == 0)
    sql_errno= ER_UNKNOWN_ERROR;
  if (msg == NULL)
    msg= ER(sql_errno);
  if (sqlstate == NULL)
   sqlstate= mysql_errno_to_sqlstate(sql_errno);

  if ((level == MYSQL_ERROR::WARN_LEVEL_WARN) &&
      really_abort_on_warning())
  {
    /*
      FIXME:
      push_warning and strict SQL_MODE case.
    */
    level= MYSQL_ERROR::WARN_LEVEL_ERROR;
    killed= THD::KILL_BAD_DATA;
  }

  switch (level)
  {
  case MYSQL_ERROR::WARN_LEVEL_NOTE:
  case MYSQL_ERROR::WARN_LEVEL_WARN:
    got_warning= 1;
    break;
  case MYSQL_ERROR::WARN_LEVEL_ERROR:
    break;
  default:
    DBUG_ASSERT(FALSE);
  }

  if (handle_condition(sql_errno, sqlstate, level, msg, &cond))
    DBUG_RETURN(cond);

  if (level == MYSQL_ERROR::WARN_LEVEL_ERROR)
  {
    is_slave_error=  1; // needed to catch query errors during replication

    /*
      thd->lex->current_select == 0 if lex structure is not inited
      (not query command (COM_QUERY))
    */
    if (lex->current_select &&
        lex->current_select->no_error && !is_fatal_error)
    {
      DBUG_PRINT("error",
                 ("Error converted to warning: current_select: no_error %d  "
                  "fatal_error: %d",
                  (lex->current_select ?
                   lex->current_select->no_error : 0),
                  (int) is_fatal_error));
    }
    else
    {
      if (! stmt_da->is_error())
        stmt_da->set_error_status(this, sql_errno, msg, sqlstate);
    }
  }

  /*
    If a continue handler is found, the error message will be cleared
    by the stored procedures code.
  */
  if (!is_fatal_error && spcont &&
      spcont->handle_condition(this, sql_errno, sqlstate, level, msg, &cond))
  {
    /*
      Do not push any warnings, a handled error must be completely
      silenced.
    */
    DBUG_RETURN(cond);
  }

  /* Un-handled conditions */

  cond= raise_condition_no_handler(sql_errno, sqlstate, level, msg);
  DBUG_RETURN(cond);
}

MYSQL_ERROR*
THD::raise_condition_no_handler(uint sql_errno,
                                const char* sqlstate,
                                MYSQL_ERROR::enum_warning_level level,
                                const char* msg)
{
  MYSQL_ERROR *cond= NULL;
  DBUG_ENTER("THD::raise_condition_no_handler");

871
  query_cache_abort(&query_cache_tls);
Marc Alff's avatar
Marc Alff committed
872 873 874 875 876 877 878 879

  /* FIXME: broken special case */
  if (no_warnings_for_error && (level == MYSQL_ERROR::WARN_LEVEL_ERROR))
    DBUG_RETURN(NULL);

  cond= warning_info->push_warning(this, sql_errno, sqlstate, level, msg);
  DBUG_RETURN(cond);
}
880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918
extern "C"
void *thd_alloc(MYSQL_THD thd, unsigned int size)
{
  return thd->alloc(size);
}

extern "C"
void *thd_calloc(MYSQL_THD thd, unsigned int size)
{
  return thd->calloc(size);
}

extern "C"
char *thd_strdup(MYSQL_THD thd, const char *str)
{
  return thd->strdup(str);
}

extern "C"
char *thd_strmake(MYSQL_THD thd, const char *str, unsigned int size)
{
  return thd->strmake(str, size);
}

extern "C"
LEX_STRING *thd_make_lex_string(THD *thd, LEX_STRING *lex_str,
                                const char *str, unsigned int size,
                                int allocate_lex_string)
{
  return thd->make_lex_string(lex_str, str, size,
                              (bool) allocate_lex_string);
}

extern "C"
void *thd_memdup(MYSQL_THD thd, const void* str, unsigned int size)
{
  return thd->memdup(str, size);
}

919
extern "C"
920 921 922 923
void thd_get_xid(const MYSQL_THD thd, MYSQL_XID *xid)
{
  *xid = *(MYSQL_XID *) &thd->transaction.xid_state.xid;
}
unknown's avatar
unknown committed
924

925 926 927 928 929 930
#ifdef _WIN32
extern "C"   THD *_current_thd_noinline(void)
{
  return my_pthread_getspecific_ptr(THD*,THR_THD);
}
#endif
unknown's avatar
unknown committed
931 932 933 934 935 936
/*
  Init common variables that has to be reset on start and on change_user
*/

void THD::init(void)
{
Marc Alff's avatar
Marc Alff committed
937
  mysql_mutex_lock(&LOCK_global_system_variables);
unknown's avatar
unknown committed
938
  plugin_thdvar_init(this);
939 940 941 942 943 944
  /*
    variables= global_system_variables above has reset
    variables.pseudo_thread_id to 0. We need to correct it here to
    avoid temporary tables replication failure.
  */
  variables.pseudo_thread_id= thread_id;
Marc Alff's avatar
Marc Alff committed
945
  mysql_mutex_unlock(&LOCK_global_system_variables);
unknown's avatar
unknown committed
946
  server_status= SERVER_STATUS_AUTOCOMMIT;
947 948
  if (variables.sql_mode & MODE_NO_BACKSLASH_ESCAPES)
    server_status|= SERVER_STATUS_NO_BACKSLASH_ESCAPES;
949

950 951
  transaction.all.modified_non_trans_table=
    transaction.stmt.modified_non_trans_table= FALSE;
unknown's avatar
unknown committed
952
  open_options=ha_open_options;
953 954 955
  update_lock_default= (variables.low_priority_updates ?
			TL_WRITE_LOW_PRIORITY :
			TL_WRITE);
unknown's avatar
unknown committed
956
  session_tx_isolation= (enum_tx_isolation) variables.tx_isolation;
957
  update_charset();
958
  reset_current_stmt_binlog_format_row();
959
  bzero((char *) &status_var, sizeof(status_var));
960
  sql_log_bin_toplevel= variables.option_bits & OPTION_BIN_LOG;
961 962 963 964 965

#if defined(ENABLED_DEBUG_SYNC)
  /* Initialize the Debug Sync Facility. See debug_sync.cc. */
  debug_sync_init_thread(this);
#endif /* defined(ENABLED_DEBUG_SYNC) */
unknown's avatar
unknown committed
966 967
}

968

969 970 971 972 973 974 975 976
/*
  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()
{
977
  set_time(); 
978
  ha_enable_transaction(this,TRUE);
979

unknown's avatar
unknown committed
980
  reset_root_defaults(mem_root, variables.query_alloc_block_size,
981 982 983 984
                      variables.query_prealloc_size);
  reset_root_defaults(&transaction.mem_root,
                      variables.trans_alloc_block_size,
                      variables.trans_prealloc_size);
985 986
  transaction.xid_state.xid.null();
  transaction.xid_state.in_thd=1;
987 988 989
}


unknown's avatar
unknown committed
990 991 992 993 994 995 996 997 998 999 1000 1001 1002
/*
  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)
{
Marc Alff's avatar
Marc Alff committed
1003
  mysql_mutex_lock(&LOCK_status);
1004
  add_to_status(&global_status_var, &status_var);
Marc Alff's avatar
Marc Alff committed
1005
  mysql_mutex_unlock(&LOCK_status);
1006

unknown's avatar
unknown committed
1007
  cleanup();
1008
  killed= NOT_KILLED;
unknown's avatar
unknown committed
1009
  cleanup_done= 0;
unknown's avatar
unknown committed
1010
  init();
1011
  stmt_map.reset();
Konstantin Osipov's avatar
Konstantin Osipov committed
1012 1013 1014
  my_hash_init(&user_vars, system_charset_info, USER_VARS_HASH_SIZE, 0, 0,
               (my_hash_get_key) get_var_key,
               (my_hash_free_key) free_user_var, 0);
1015 1016
  sp_cache_clear(&sp_proc_cache);
  sp_cache_clear(&sp_func_cache);
unknown's avatar
unknown committed
1017 1018 1019
}


unknown's avatar
unknown committed
1020 1021 1022
/* Do operations that may take a long time */

void THD::cleanup(void)
unknown's avatar
unknown committed
1023
{
unknown's avatar
unknown committed
1024
  DBUG_ENTER("THD::cleanup");
unknown's avatar
unknown committed
1025 1026
  DBUG_ASSERT(cleanup_done == 0);

1027
  killed= KILL_CONNECTION;
unknown's avatar
unknown committed
1028
#ifdef ENABLE_WHEN_BINLOG_WILL_BE_ABLE_TO_PREPARE
1029 1030 1031 1032
  if (transaction.xid_state.xa_state == XA_PREPARED)
  {
#error xid_state in the cache should be replaced by the allocated value
  }
unknown's avatar
unknown committed
1033
#endif
1034
  {
Konstantin Osipov's avatar
Konstantin Osipov committed
1035 1036
    transaction.xid_state.xa_state= XA_NOTR;
    trans_rollback(this);
1037 1038
    xid_cache_delete(&transaction.xid_state);
  }
1039

Konstantin Osipov's avatar
Konstantin Osipov committed
1040
  locked_tables_list.unlock_locked_tables(this);
1041
  mysql_ha_cleanup(this);
1042

1043
  DBUG_ASSERT(open_tables == NULL);
1044 1045 1046 1047 1048 1049
  /*
    If the thread was in the middle of an ongoing transaction (rolled
    back a few lines above) or under LOCK TABLES (unlocked the tables
    and left the mode a few lines above), there will be outstanding
    metadata locks. Release them.
  */
1050
  mdl_context.release_transactional_locks();
1051

1052 1053 1054 1055 1056 1057 1058
  /* Release the global read lock, if acquired. */
  if (global_read_lock.is_acquired())
    global_read_lock.unlock_global_read_lock(this);

  /* All metadata locks must have been released by now. */
  DBUG_ASSERT(!mdl_context.has_locks());

1059 1060 1061 1062 1063
#if defined(ENABLED_DEBUG_SYNC)
  /* End the Debug Sync Facility. See debug_sync.cc. */
  debug_sync_end_thread(this);
#endif /* defined(ENABLED_DEBUG_SYNC) */

1064
  delete_dynamic(&user_var_events);
Konstantin Osipov's avatar
Konstantin Osipov committed
1065
  my_hash_free(&user_vars);
unknown's avatar
unknown committed
1066
  close_temporary_tables(this);
1067
  sp_cache_clear(&sp_proc_cache);
1068 1069
  sp_cache_clear(&sp_func_cache);

unknown's avatar
unknown committed
1070
  if (ull)
1071
  {
Marc Alff's avatar
Marc Alff committed
1072
    mysql_mutex_lock(&LOCK_user_locks);
unknown's avatar
unknown committed
1073
    item_user_lock_release(ull);
Marc Alff's avatar
Marc Alff committed
1074
    mysql_mutex_unlock(&LOCK_user_locks);
1075
    ull= NULL;
1076
  }
1077

unknown's avatar
unknown committed
1078 1079 1080 1081
  cleanup_done=1;
  DBUG_VOID_RETURN;
}

unknown's avatar
unknown committed
1082

unknown's avatar
unknown committed
1083 1084
THD::~THD()
{
1085
  THD_CHECK_SENTRY(this);
unknown's avatar
unknown committed
1086
  DBUG_ENTER("~THD()");
1087
  /* Ensure that no one is using THD */
Marc Alff's avatar
Marc Alff committed
1088 1089
  mysql_mutex_lock(&LOCK_thd_data);
  mysql_mutex_unlock(&LOCK_thd_data);
1090
  add_to_status(&global_status_var, &status_var);
1091

unknown's avatar
unknown committed
1092
  /* Close connection */
unknown's avatar
unknown committed
1093
#ifndef EMBEDDED_LIBRARY
unknown's avatar
unknown committed
1094 1095 1096
  if (net.vio)
  {
    vio_delete(net.vio);
unknown's avatar
unknown committed
1097
    net_end(&net);
unknown's avatar
unknown committed
1098
  }
1099
#endif
1100
  stmt_map.reset();                     /* close all prepared statements */
1101
  DBUG_ASSERT(lock_info.n_cursors == 0);
unknown's avatar
unknown committed
1102 1103
  if (!cleanup_done)
    cleanup();
1104

Konstantin Osipov's avatar
Konstantin Osipov committed
1105
  mdl_context.destroy();
unknown's avatar
unknown committed
1106
  ha_close_connection(this);
1107
  mysql_audit_release(this);
unknown's avatar
unknown committed
1108
  plugin_thdvar_cleanup(this);
unknown's avatar
unknown committed
1109

1110 1111
  DBUG_PRINT("info", ("freeing security context"));
  main_security_ctx.destroy();
1112
  safeFree(db);
1113
  free_root(&transaction.mem_root,MYF(0));
unknown's avatar
unknown committed
1114
  mysys_var=0;					// Safety (shouldn't be needed)
Marc Alff's avatar
Marc Alff committed
1115
  mysql_mutex_destroy(&LOCK_thd_data);
1116
#ifndef DBUG_OFF
unknown's avatar
unknown committed
1117
  dbug_sentry= THD_SENTRY_GONE;
1118
#endif  
1119 1120
#ifndef EMBEDDED_LIBRARY
  if (rli_fake)
1121
  {
1122
    delete rli_fake;
1123 1124
    rli_fake= NULL;
  }
1125 1126
  
  mysql_audit_free_thd(this);
1127 1128
#endif

1129
  free_root(&main_mem_root, MYF(0));
unknown's avatar
unknown committed
1130 1131 1132
  DBUG_VOID_RETURN;
}

1133

1134
/*
unknown's avatar
unknown committed
1135 1136 1137 1138 1139 1140
  Add all status variables to another status variable array

  SYNOPSIS
   add_to_status()
   to_var       add to this array
   from_var     from this array
1141 1142 1143 1144 1145 1146 1147 1148 1149

  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)
{
1150
  ulong *end= (ulong*) ((uchar*) to_var +
1151
                        offsetof(STATUS_VAR, last_system_status_var) +
1152 1153 1154 1155 1156 1157 1158
			sizeof(ulong));
  ulong *to= (ulong*) to_var, *from= (ulong*) from_var;

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

1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174
/*
  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)
{
1175
  ulong *end= (ulong*) ((uchar*) to_var + offsetof(STATUS_VAR,
1176 1177 1178 1179 1180 1181 1182 1183
						  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++);
}

1184

unknown's avatar
SCRUM  
unknown committed
1185
void THD::awake(THD::killed_state state_to_set)
1186
{
1187
  DBUG_ENTER("THD::awake");
unknown's avatar
unknown committed
1188
  DBUG_PRINT("enter", ("this: 0x%lx", (long) this));
1189
  THD_CHECK_SENTRY(this);
Marc Alff's avatar
Marc Alff committed
1190
  mysql_mutex_assert_owner(&LOCK_thd_data);
1191

unknown's avatar
SCRUM  
unknown committed
1192 1193
  killed= state_to_set;
  if (state_to_set != THD::KILL_QUERY)
1194
  {
unknown's avatar
unknown committed
1195 1196 1197
    thr_alarm_kill(thread_id);
    if (!slave_thread)
      thread_scheduler.post_kill_notification(this);
1198
#ifdef SIGNAL_WITH_VIO_CLOSE
1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212
    if (this != current_thd)
    {
      /*
        In addition to a signal, let's close the socket of the thread that
        is being killed. This is to make sure it does not block if the
        signal is lost. This needs to be done only on platforms where
        signals are not a reliable interruption mechanism.

        If we're killing ourselves, we know that we're not blocked, so this
        hack is not used.
      */

      close_active_vio();
    }
1213
#endif    
1214
  }
1215
  if (mysys_var)
unknown's avatar
unknown committed
1216
  {
Marc Alff's avatar
Marc Alff committed
1217
    mysql_mutex_lock(&mysys_var->mutex);
unknown's avatar
unknown committed
1218 1219 1220 1221 1222 1223 1224
    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.
1225 1226 1227 1228 1229
      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.
1230

1231
      Note that there is a small chance we fail to kill. If victim has locked
1232 1233 1234 1235 1236
      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
1237
      see it immediately and so may have time to reach the cond_wait().
unknown's avatar
unknown committed
1238
    */
1239
    if (mysys_var->current_cond && mysys_var->current_mutex)
1240
    {
Marc Alff's avatar
Marc Alff committed
1241 1242 1243
      mysql_mutex_lock(mysys_var->current_mutex);
      mysql_cond_broadcast(mysys_var->current_cond);
      mysql_mutex_unlock(mysys_var->current_mutex);
1244
    }
Marc Alff's avatar
Marc Alff committed
1245
    mysql_mutex_unlock(&mysys_var->mutex);
unknown's avatar
unknown committed
1246
  }
1247
  DBUG_VOID_RETURN;
1248 1249
}

unknown's avatar
unknown committed
1250 1251 1252 1253
/*
  Remember the location of thread info, the structure needed for
  sql_alloc() and the structure for the net buffer
*/
unknown's avatar
unknown committed
1254 1255 1256

bool THD::store_globals()
{
1257 1258 1259 1260
  /*
    Assert that thread_stack is initialized: it's necessary to be able
    to track stack overrun.
  */
unknown's avatar
unknown committed
1261
  DBUG_ASSERT(thread_stack);
1262

1263
  if (my_pthread_setspecific_ptr(THR_THD,  this) ||
unknown's avatar
unknown committed
1264
      my_pthread_setspecific_ptr(THR_MALLOC, &mem_root))
1265 1266
    return 1;
  mysys_var=my_thread_var;
unknown's avatar
unknown committed
1267
  /*
unknown's avatar
unknown committed
1268 1269
    Let mysqld define the thread id (not mysys)
    This allows us to move THD to different threads if needed.
unknown's avatar
unknown committed
1270
  */
unknown's avatar
unknown committed
1271 1272 1273
  mysys_var->id= thread_id;
  real_id= pthread_self();                      // For debugging

1274 1275 1276 1277
  /*
    We have to call thr_lock_info_init() again here as THD may have been
    created in another thread
  */
1278
  thr_lock_info_init(&lock_info);
1279
  return 0;
unknown's avatar
unknown committed
1280 1281
}

unknown's avatar
unknown committed
1282

1283 1284 1285 1286 1287
/*
  Cleanup after query.

  SYNOPSIS
    THD::cleanup_after_query()
1288

1289
  DESCRIPTION
unknown's avatar
unknown committed
1290
    This function is used to reset thread data to its default state.
1291 1292 1293 1294 1295 1296 1297

  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.
*/
unknown's avatar
unknown committed
1298

1299 1300
void THD::cleanup_after_query()
{
1301 1302 1303 1304 1305 1306 1307 1308 1309 1310
  /*
    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. 
  */
1311 1312 1313 1314 1315
  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();
1316
    rand_used= 0;
1317
  }
1318
  if (first_successful_insert_id_in_cur_stmt > 0)
1319
  {
1320 1321 1322 1323
    /* 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;
unknown's avatar
unknown committed
1324
    substitute_null_with_insert_id= TRUE;
1325
  }
1326
  arg_of_last_insert_id_function= 0;
1327
  /* Free Items that were created during this execution */
1328
  free_items();
1329 1330
  /* Reset where. */
  where= THD::DEFAULT_WHERE;
1331 1332
  /* reset table map for multi-table update */
  table_map_for_update= 0;
1333 1334
}

unknown's avatar
unknown committed
1335

1336
/**
unknown's avatar
unknown committed
1337
  Create a LEX_STRING in this connection.
1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359

  @param lex_str  pointer to LEX_STRING object to be initialized
  @param str      initializer to be copied into lex_str
  @param length   length of str, in bytes
  @param allocate_lex_string  if TRUE, allocate new LEX_STRING object,
                              instead of using lex_str value
  @return  NULL on failure, or pointer to the LEX_STRING object
*/
LEX_STRING *THD::make_lex_string(LEX_STRING *lex_str,
                                 const char* str, uint length,
                                 bool allocate_lex_string)
{
  if (allocate_lex_string)
    if (!(lex_str= (LEX_STRING *)alloc(sizeof(LEX_STRING))))
      return 0;
  if (!(lex_str->str= strmake_root(mem_root, str, length)))
    return 0;
  lex_str->length= length;
  return lex_str;
}


unknown's avatar
unknown committed
1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384
/*
  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");
1385
  size_t new_length= to_cs->mbmaxlen * from_length;
1386
  uint dummy_errors;
1387
  if (!(to->str= (char*) alloc(new_length+1)))
unknown's avatar
unknown committed
1388 1389 1390 1391 1392
  {
    to->length= 0;				// Safety fix
    DBUG_RETURN(1);				// EOM
  }
  to->length= copy_and_convert((char*) to->str, new_length, to_cs,
1393
			       from, from_length, from_cs, &dummy_errors);
unknown's avatar
unknown committed
1394 1395 1396 1397 1398
  to->str[to->length]=0;			// Safety
  DBUG_RETURN(0);
}


1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 1414 1415
/*
  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)
{
1416 1417
  uint dummy_errors;
  if (convert_buffer.copy(s->ptr(), s->length(), from_cs, to_cs, &dummy_errors))
1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428
    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;
}

1429

unknown's avatar
unknown committed
1430 1431 1432 1433 1434 1435
/*
  Update some cache variables when character set changes
*/

void THD::update_charset()
{
1436
  uint32 not_used;
1437 1438 1439 1440 1441
  charset_is_system_charset=
    !String::needs_conversion(0,
                              variables.character_set_client,
                              system_charset_info,
                              &not_used);
1442
  charset_is_collation_connection= 
1443 1444 1445
    !String::needs_conversion(0,
                              variables.character_set_client,
                              variables.collation_connection,
1446
                              &not_used);
unknown's avatar
unknown committed
1447
  charset_is_character_set_filesystem= 
1448 1449 1450 1451
    !String::needs_conversion(0,
                              variables.character_set_client,
                              variables.character_set_filesystem,
                              &not_used);
unknown's avatar
unknown committed
1452 1453 1454
}


1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468
/* 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 */
1469

1470 1471
void THD::add_changed_table(TABLE *table)
{
1472
  DBUG_ENTER("THD::add_changed_table(table)");
1473

1474
  DBUG_ASSERT(in_multi_stmt_transaction() && table->file->has_transactions());
unknown's avatar
unknown committed
1475
  add_changed_table(table->s->table_cache_key.str,
1476
                    (long) table->s->table_cache_key.length);
unknown's avatar
unknown committed
1477
  DBUG_VOID_RETURN;
unknown's avatar
unknown committed
1478
}
1479

1480

unknown's avatar
unknown committed
1481 1482 1483
void THD::add_changed_table(const char *key, long key_length)
{
  DBUG_ENTER("THD::add_changed_table(key)");
1484 1485
  CHANGED_TABLE_LIST **prev_changed = &transaction.changed_tables;
  CHANGED_TABLE_LIST *curr = transaction.changed_tables;
1486

1487
  for (; curr; prev_changed = &(curr->next), curr = curr->next)
1488
  {
unknown's avatar
unknown committed
1489
    int cmp =  (long)curr->key_length - (long)key_length;
1490 1491
    if (cmp < 0)
    {
1492
      list_include(prev_changed, curr, changed_table_dup(key, key_length));
1493
      DBUG_PRINT("info", 
unknown's avatar
unknown committed
1494 1495
		 ("key_length: %ld  %u", key_length,
                  (*prev_changed)->key_length));
1496 1497 1498 1499
      DBUG_VOID_RETURN;
    }
    else if (cmp == 0)
    {
unknown's avatar
unknown committed
1500
      cmp = memcmp(curr->key, key, curr->key_length);
1501 1502
      if (cmp < 0)
      {
1503
	list_include(prev_changed, curr, changed_table_dup(key, key_length));
1504
	DBUG_PRINT("info", 
1505
		   ("key_length:  %ld  %u", key_length,
1506
		    (*prev_changed)->key_length));
1507 1508 1509 1510 1511 1512 1513 1514 1515
	DBUG_VOID_RETURN;
      }
      else if (cmp == 0)
      {
	DBUG_PRINT("info", ("already in list"));
	DBUG_VOID_RETURN;
      }
    }
  }
1516
  *prev_changed = changed_table_dup(key, key_length);
unknown's avatar
unknown committed
1517
  DBUG_PRINT("info", ("key_length: %ld  %u", key_length,
1518
		      (*prev_changed)->key_length));
1519 1520 1521
  DBUG_VOID_RETURN;
}

1522

unknown's avatar
unknown committed
1523
CHANGED_TABLE_LIST* THD::changed_table_dup(const char *key, long key_length)
1524 1525 1526
{
  CHANGED_TABLE_LIST* new_table = 
    (CHANGED_TABLE_LIST*) trans_alloc(ALIGN_SIZE(sizeof(CHANGED_TABLE_LIST))+
unknown's avatar
unknown committed
1527
				      key_length + 1);
1528 1529
  if (!new_table)
  {
1530 1531
    my_error(EE_OUTOFMEMORY, MYF(ME_BELL),
             ALIGN_SIZE(sizeof(TABLE_LIST)) + key_length + 1);
unknown's avatar
SCRUM  
unknown committed
1532
    killed= KILL_CONNECTION;
1533 1534 1535
    return 0;
  }

1536
  new_table->key= ((char*)new_table)+ ALIGN_SIZE(sizeof(CHANGED_TABLE_LIST));
1537
  new_table->next = 0;
unknown's avatar
unknown committed
1538 1539
  new_table->key_length = key_length;
  ::memcpy(new_table->key, key, key_length);
1540 1541 1542
  return new_table;
}

1543

unknown's avatar
unknown committed
1544 1545 1546 1547
int THD::send_explain_fields(select_result *result)
{
  List<Item> field_list;
  Item *item;
1548
  CHARSET_INFO *cs= system_charset_info;
1549
  field_list.push_back(new Item_return_int("id",3, MYSQL_TYPE_LONGLONG));
1550
  field_list.push_back(new Item_empty_string("select_type", 19, cs));
1551
  field_list.push_back(item= new Item_empty_string("table", NAME_CHAR_LEN, cs));
unknown's avatar
unknown committed
1552
  item->maybe_null= 1;
unknown's avatar
unknown committed
1553 1554
  if (lex->describe & DESCRIBE_PARTITIONS)
  {
1555 1556 1557 1558
    /* 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);
unknown's avatar
unknown committed
1559 1560
    item->maybe_null= 1;
  }
unknown's avatar
unknown committed
1561 1562
  field_list.push_back(item= new Item_empty_string("type", 10, cs));
  item->maybe_null= 1;
unknown's avatar
unknown committed
1563
  field_list.push_back(item=new Item_empty_string("possible_keys",
1564
						  NAME_CHAR_LEN*MAX_KEY, cs));
unknown's avatar
unknown committed
1565
  item->maybe_null=1;
1566
  field_list.push_back(item=new Item_empty_string("key", NAME_CHAR_LEN, cs));
unknown's avatar
unknown committed
1567
  item->maybe_null=1;
unknown's avatar
unknown committed
1568
  field_list.push_back(item=new Item_empty_string("key_len",
1569
						  NAME_CHAR_LEN*MAX_KEY));
unknown's avatar
unknown committed
1570 1571
  item->maybe_null=1;
  field_list.push_back(item=new Item_empty_string("ref",
1572 1573
                                                  NAME_CHAR_LEN*MAX_REF_PARTS,
                                                  cs));
unknown's avatar
unknown committed
1574
  item->maybe_null=1;
unknown's avatar
unknown committed
1575 1576
  field_list.push_back(item= new Item_return_int("rows", 10,
                                                 MYSQL_TYPE_LONGLONG));
1577 1578 1579 1580 1581
  if (lex->describe & DESCRIBE_EXTENDED)
  {
    field_list.push_back(item= new Item_float("filtered", 0.1234, 2, 4));
    item->maybe_null=1;
  }
unknown's avatar
unknown committed
1582
  item->maybe_null= 1;
1583
  field_list.push_back(new Item_empty_string("Extra", 255, cs));
1584 1585
  return (result->send_result_set_metadata(field_list,
                                           Protocol::SEND_NUM_ROWS | Protocol::SEND_EOF));
unknown's avatar
unknown committed
1586
}
1587

unknown's avatar
unknown committed
1588 1589 1590
#ifdef SIGNAL_WITH_VIO_CLOSE
void THD::close_active_vio()
{
unknown's avatar
unknown committed
1591
  DBUG_ENTER("close_active_vio");
Marc Alff's avatar
Marc Alff committed
1592
  mysql_mutex_assert_owner(&LOCK_thd_data);
unknown's avatar
unknown committed
1593
#ifndef EMBEDDED_LIBRARY
unknown's avatar
unknown committed
1594 1595 1596 1597 1598
  if (active_vio)
  {
    vio_close(active_vio);
    active_vio = 0;
  }
unknown's avatar
unknown committed
1599
#endif
1600
  DBUG_VOID_RETURN;
unknown's avatar
unknown committed
1601 1602 1603
}
#endif

1604

1605 1606 1607 1608 1609
struct Item_change_record: public ilink
{
  Item **place;
  Item *old_value;
  /* Placement new was hidden by `new' in ilink (TODO: check): */
1610
  static void *operator new(size_t size, void *mem) { return mem; }
1611 1612
  static void operator delete(void *ptr, size_t size) {}
  static void operator delete(void *ptr, void *mem) { /* never called */ }
1613 1614 1615 1616 1617 1618
};


/*
  Register an item tree tree transformation, performed by the query
  optimizer. We need a pointer to runtime_memroot because it may be !=
unknown's avatar
unknown committed
1619
  thd->mem_root (due to possible set_n_backup_active_arena called for thd).
1620 1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633
*/

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)
  {
1634 1635 1636 1637
    /*
      OOM, thd->fatal_error() is called by the error handler of the
      memroot. Just return.
    */
1638 1639 1640 1641 1642
    return;
  }
  change= new (change_mem) Item_change_record;
  change->place= place;
  change->old_value= old_value;
1643
  change_list.append(change);
1644 1645 1646 1647 1648 1649 1650
}


void THD::rollback_item_tree_changes()
{
  I_List_iterator<Item_change_record> it(change_list);
  Item_change_record *change;
unknown's avatar
unknown committed
1651 1652
  DBUG_ENTER("rollback_item_tree_changes");

1653 1654 1655 1656
  while ((change= it++))
    *change->place= change->old_value;
  /* We can forget about changes memory: it's allocated in runtime memroot */
  change_list.empty();
unknown's avatar
unknown committed
1657
  DBUG_VOID_RETURN;
1658 1659 1660
}


unknown's avatar
unknown committed
1661 1662 1663 1664 1665 1666 1667 1668 1669
/*****************************************************************************
** Functions to provide a interface to select results
*****************************************************************************/

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

1670 1671
void select_result::send_error(uint errcode,const char *err)
{
unknown's avatar
unknown committed
1672
  my_message(errcode, err, MYF(0));
1673 1674
}

1675 1676 1677 1678 1679 1680

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

1681 1682 1683 1684 1685 1686 1687
bool select_result::check_simple_select() const
{
  my_error(ER_SP_BAD_CURSOR_QUERY, MYF(0));
  return TRUE;
}


1688 1689 1690
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);
1691
static String default_xml_row_term("<row>", default_charset_info);
unknown's avatar
unknown committed
1692

1693 1694
sql_exchange::sql_exchange(char *name, bool flag,
                           enum enum_filetype filetype_arg)
unknown's avatar
unknown committed
1695 1696
  :file_name(name), opt_enclosed(0), dumpfile(flag), skip_lines(0)
{
1697
  filetype= filetype_arg;
unknown's avatar
unknown committed
1698
  field_term= &default_field_term;
unknown's avatar
SCRUM  
unknown committed
1699
  enclosed=   line_start= &my_empty_string;
1700 1701
  line_term=  filetype == FILETYPE_CSV ?
              &default_line_term : &default_xml_row_term;
unknown's avatar
unknown committed
1702
  escaped=    &default_escaped;
1703
  cs= NULL;
unknown's avatar
unknown committed
1704 1705
}

1706 1707 1708 1709 1710 1711
bool sql_exchange::escaped_given(void)
{
  return escaped != &default_escaped;
}


1712
bool select_send::send_result_set_metadata(List<Item> &list, uint flags)
unknown's avatar
unknown committed
1713
{
1714
  bool res;
1715
  if (!(res= thd->protocol->send_result_set_metadata(&list, flags)))
1716
    is_result_set_started= 1;
1717
  return res;
unknown's avatar
unknown committed
1718 1719
}

1720 1721 1722
void select_send::abort()
{
  DBUG_ENTER("select_send::abort");
Marc Alff's avatar
Marc Alff committed
1723 1724

  if (is_result_set_started && thd->spcont)
1725 1726
  {
    /*
1727
      We're executing a stored procedure, have an open result
Marc Alff's avatar
Marc Alff committed
1728 1729 1730
      set and an SQL exception condition. In this situation we
      must abort the current statement, silence the error and
      start executing the continue/exit handler if one is found.
1731 1732 1733
      Before aborting the statement, let's end the open result set, as
      otherwise the client will hang due to the violation of the
      client/server protocol.
1734
    */
Marc Alff's avatar
Marc Alff committed
1735
    thd->spcont->end_partial_result_set= TRUE;
1736 1737 1738 1739 1740
  }
  DBUG_VOID_RETURN;
}


1741 1742 1743 1744 1745 1746 1747 1748 1749 1750 1751
/** 
  Cleanup an instance of this class for re-use
  at next execution of a prepared statement/
  stored procedure statement.
*/

void select_send::cleanup()
{
  is_result_set_started= FALSE;
}

unknown's avatar
unknown committed
1752 1753 1754 1755
/* Send data to client. Returns 0 if ok */

bool select_send::send_data(List<Item> &items)
{
1756 1757 1758
  Protocol *protocol= thd->protocol;
  DBUG_ENTER("select_send::send_data");

1759
  if (unit->offset_limit_cnt)
unknown's avatar
unknown committed
1760
  {						// using limit offset,count
1761
    unit->offset_limit_cnt--;
1762
    DBUG_RETURN(FALSE);
unknown's avatar
unknown committed
1763
  }
1764

unknown's avatar
unknown committed
1765 1766 1767 1768 1769
  /*
    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
  */
1770
  ha_release_temporary_latches(thd);
1771

1772
  protocol->prepare_for_resend();
1773
  if (protocol->send_result_set_row(&items))
1774 1775
  {
    protocol->remove_last_row();
1776
    DBUG_RETURN(TRUE);
1777
  }
1778 1779 1780

  thd->sent_row_count++;

1781
  if (thd->vio_ok())
1782
    DBUG_RETURN(protocol->write());
1783

1784
  DBUG_RETURN(0);
unknown's avatar
unknown committed
1785 1786 1787 1788
}

bool select_send::send_eof()
{
1789 1790 1791 1792 1793 1794
  /* 
    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);
1795

unknown's avatar
unknown committed
1796
  /* Unlock tables before sending packet to gain some speed */
Konstantin Osipov's avatar
Konstantin Osipov committed
1797
  if (thd->lock && ! thd->locked_tables_mode)
unknown's avatar
unknown committed
1798
  {
1799 1800
    mysql_unlock_tables(thd, thd->lock);
    thd->lock=0;
unknown's avatar
unknown committed
1801
  }
1802 1803 1804 1805 1806 1807
  /* 
    Don't send EOF if we're in error condition (which implies we've already
    sent or are sending an error)
  */
  if (thd->is_error())
    return TRUE;
1808
  ::my_eof(thd);
1809 1810
  is_result_set_started= 0;
  return FALSE;
unknown's avatar
unknown committed
1811 1812 1813
}


1814 1815 1816
/************************************************************************
  Handling writing to file
************************************************************************/
unknown's avatar
unknown committed
1817

1818 1819
void select_to_file::send_error(uint errcode,const char *err)
{
unknown's avatar
unknown committed
1820
  my_message(errcode, err, MYF(0));
1821 1822 1823
  if (file > 0)
  {
    (void) end_io_cache(&cache);
Marc Alff's avatar
Marc Alff committed
1824 1825 1826
    mysql_file_close(file, MYF(0));
    /* Delete file on error */
    mysql_file_delete(key_select_to_file, path, MYF(0));
1827 1828 1829
    file= -1;
  }
}
unknown's avatar
unknown committed
1830 1831


1832 1833 1834
bool select_to_file::send_eof()
{
  int error= test(end_io_cache(&cache));
Marc Alff's avatar
Marc Alff committed
1835
  if (mysql_file_close(file, MYF(MY_WME)))
1836 1837
    error= 1;
  if (!error)
1838 1839 1840 1841 1842 1843
  {
    /*
      In order to remember the value of affected rows for ROW_COUNT()
      function, SELECT INTO has to have an own SQLCOM.
      TODO: split from SQLCOM_SELECT
    */
1844
    ::my_ok(thd,row_count);
1845
  }
1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856
  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);
Marc Alff's avatar
Marc Alff committed
1857
    mysql_file_close(file, MYF(0));
1858 1859 1860 1861 1862 1863 1864
    file= -1;
  }
  path[0]= '\0';
  row_count= 0;
}


1865
select_to_file::~select_to_file()
unknown's avatar
unknown committed
1866 1867 1868 1869
{
  if (file >= 0)
  {					// This only happens in case of error
    (void) end_io_cache(&cache);
Marc Alff's avatar
Marc Alff committed
1870
    mysql_file_close(file, MYF(0));
unknown's avatar
unknown committed
1871 1872
    file= -1;
  }
1873 1874 1875 1876 1877 1878 1879 1880
}

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

select_export::~select_export()
{
1881
  thd->sent_row_count=row_count;
unknown's avatar
unknown committed
1882 1883
}

1884

1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902
/*
  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)
unknown's avatar
unknown committed
1903
{
1904
  File file;
1905
  uint option= MY_UNPACK_FILENAME | MY_RELATIVE_PATH;
1906

unknown's avatar
unknown committed
1907
#ifdef DONT_ALLOW_FULL_LOAD_DATA_PATHS
1908
  option|= MY_REPLACE_DIR;			// Force use of db directory
unknown's avatar
unknown committed
1909
#endif
1910

unknown's avatar
unknown committed
1911
  if (!dirname_length(exchange->file_name))
1912
  {
unknown's avatar
unknown committed
1913 1914
    strxnmov(path, FN_REFLEN-1, mysql_real_data_home, thd->db ? thd->db : "",
             NullS);
1915 1916 1917 1918
    (void) fn_format(path, exchange->file_name, path, "", option);
  }
  else
    (void) fn_format(path, exchange->file_name, mysql_real_data_home, "", option);
1919

1920
  if (!is_secure_file_path(path))
1921 1922 1923 1924 1925 1926
  {
    /* 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;
  }

1927
  if (!access(path, F_OK))
unknown's avatar
unknown committed
1928
  {
1929
    my_error(ER_FILE_EXISTS_ERROR, MYF(0), exchange->file_name);
unknown's avatar
unknown committed
1930
    return -1;
unknown's avatar
unknown committed
1931 1932
  }
  /* Create the file world readable */
Marc Alff's avatar
Marc Alff committed
1933 1934
  if ((file= mysql_file_create(key_select_to_file,
                               path, 0666, O_WRONLY|O_EXCL, MYF(MY_WME))) < 0)
1935
    return file;
unknown's avatar
unknown committed
1936
#ifdef HAVE_FCHMOD
1937
  (void) fchmod(file, 0666);			// Because of umask()
unknown's avatar
unknown committed
1938
#else
1939
  (void) chmod(path, 0666);
unknown's avatar
unknown committed
1940
#endif
1941
  if (init_io_cache(cache, file, 0L, WRITE_CACHE, 0L, 1, MYF(MY_WME)))
unknown's avatar
unknown committed
1942
  {
Marc Alff's avatar
Marc Alff committed
1943 1944 1945
    mysql_file_close(file, MYF(0));
    /* Delete file on error, it was just created */
    mysql_file_delete(key_select_to_file, path, MYF(0));
1946
    return -1;
unknown's avatar
unknown committed
1947
  }
1948
  return file;
1949 1950 1951 1952 1953 1954 1955
}


int
select_export::prepare(List<Item> &list, SELECT_LEX_UNIT *u)
{
  bool blob_flag=0;
1956
  bool string_results= FALSE, non_string_results= FALSE;
1957 1958 1959 1960
  unit= u;
  if ((uint) strlen(exchange->file_name) + NAME_LEN >= FN_REFLEN)
    strmake(path,exchange->file_name,FN_REFLEN-1);

1961 1962
  write_cs= exchange->cs ? exchange->cs : &my_charset_bin;

1963
  if ((file= create_file(thd, path, exchange, &cache)) < 0)
1964
    return 1;
unknown's avatar
unknown committed
1965 1966
  /* Check if there is any blobs in data */
  {
unknown's avatar
unknown committed
1967
    List_iterator_fast<Item> li(list);
unknown's avatar
unknown committed
1968 1969 1970 1971 1972 1973 1974 1975
    Item *item;
    while ((item=li++))
    {
      if (item->max_length >= MAX_BLOB_WIDTH)
      {
	blob_flag=1;
	break;
      }
1976 1977 1978 1979
      if (item->result_type() == STRING_RESULT)
        string_results= TRUE;
      else
        non_string_results= TRUE;
unknown's avatar
unknown committed
1980 1981
    }
  }
1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006
  if (exchange->escaped->numchars() > 1 || exchange->enclosed->numchars() > 1)
  {
    my_error(ER_WRONG_FIELD_TERMINATORS, MYF(0));
    return TRUE;
  }
  if (exchange->escaped->length() > 1 || exchange->enclosed->length() > 1 ||
      !my_isascii(exchange->escaped->ptr()[0]) ||
      !my_isascii(exchange->enclosed->ptr()[0]) ||
      !exchange->field_term->is_ascii() || !exchange->line_term->is_ascii() ||
      !exchange->line_start->is_ascii())
  {
    /*
      Current LOAD DATA INFILE recognizes field/line separators "as is" without
      converting from client charset to data file charset. So, it is supposed,
      that input file of LOAD DATA INFILE consists of data in one charset and
      separators in other charset. For the compatibility with that [buggy]
      behaviour SELECT INTO OUTFILE implementation has been saved "as is" too,
      but the new warning message has been added:

        Non-ASCII separator arguments are not fully supported
    */
    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                 WARN_NON_ASCII_SEPARATOR_NOT_IMPLEMENTED,
                 ER(WARN_NON_ASCII_SEPARATOR_NOT_IMPLEMENTED));
  }
unknown's avatar
unknown committed
2007
  field_term_length=exchange->field_term->length();
unknown's avatar
unknown committed
2008 2009
  field_term_char= field_term_length ?
                   (int) (uchar) (*exchange->field_term)[0] : INT_MAX;
unknown's avatar
unknown committed
2010 2011
  if (!exchange->line_term->length())
    exchange->line_term=exchange->field_term;	// Use this if it exists
unknown's avatar
unknown committed
2012 2013
  field_sep_char= (exchange->enclosed->length() ?
                  (int) (uchar) (*exchange->enclosed)[0] : field_term_char);
2014 2015 2016 2017 2018
  if (exchange->escaped->length() && (exchange->escaped_given() ||
      !(thd->variables.sql_mode & MODE_NO_BACKSLASH_ESCAPES)))
    escape_char= (int) (uchar) (*exchange->escaped)[0];
  else
    escape_char= -1;
unknown's avatar
unknown committed
2019
  is_ambiguous_field_sep= test(strchr(ESCAPE_CHARS, field_sep_char));
unknown's avatar
unknown committed
2020
  is_unsafe_field_sep= test(strchr(NUMERIC_CHARS, field_sep_char));
unknown's avatar
unknown committed
2021
  line_sep_char= (exchange->line_term->length() ?
unknown's avatar
unknown committed
2022
                 (int) (uchar) (*exchange->line_term)[0] : INT_MAX);
unknown's avatar
unknown committed
2023 2024 2025 2026 2027 2028
  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);
2029 2030 2031 2032 2033 2034 2035 2036 2037 2038 2039 2040
  if ((is_ambiguous_field_sep && exchange->enclosed->is_empty() &&
       (string_results || is_unsafe_field_sep)) ||
      (exchange->opt_enclosed && non_string_results &&
       field_term_length && strchr(NUMERIC_CHARS, field_term_char)))
  {
    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                 ER_AMBIGUOUS_FIELD_TERM, ER(ER_AMBIGUOUS_FIELD_TERM));
    is_ambiguous_field_term= TRUE;
  }
  else
    is_ambiguous_field_term= FALSE;

unknown's avatar
unknown committed
2041 2042 2043 2044
  return 0;
}


2045
#define NEED_ESCAPING(x) ((int) (uchar) (x) == escape_char    || \
2046 2047
                          (enclosed ? (int) (uchar) (x) == field_sep_char      \
                                    : (int) (uchar) (x) == field_term_char) || \
2048 2049 2050
                          (int) (uchar) (x) == line_sep_char  || \
                          !(x))

unknown's avatar
unknown committed
2051 2052 2053
bool select_export::send_data(List<Item> &items)
{

2054
  DBUG_ENTER("select_export::send_data");
unknown's avatar
unknown committed
2055
  char buff[MAX_FIELD_WIDTH],null_buff[2],space[MAX_FIELD_WIDTH];
2056 2057
  char cvt_buff[MAX_FIELD_WIDTH];
  String cvt_str(cvt_buff, sizeof(cvt_buff), write_cs);
unknown's avatar
unknown committed
2058
  bool space_inited=0;
unknown's avatar
unknown committed
2059
  String tmp(buff,sizeof(buff),&my_charset_bin),*res;
unknown's avatar
unknown committed
2060 2061
  tmp.length(0);

2062
  if (unit->offset_limit_cnt)
unknown's avatar
unknown committed
2063
  {						// using limit offset,count
2064
    unit->offset_limit_cnt--;
unknown's avatar
unknown committed
2065 2066 2067 2068 2069
    DBUG_RETURN(0);
  }
  row_count++;
  Item *item;
  uint used_length=0,items_left=items.elements;
unknown's avatar
unknown committed
2070
  List_iterator_fast<Item> li(items);
unknown's avatar
unknown committed
2071

2072
  if (my_b_write(&cache,(uchar*) exchange->line_start->ptr(),
unknown's avatar
unknown committed
2073 2074 2075 2076 2077
		 exchange->line_start->length()))
    goto err;
  while ((item=li++))
  {
    Item_result result_type=item->result_type();
2078 2079
    bool enclosed = (exchange->enclosed->length() &&
                     (!exchange->opt_enclosed || result_type == STRING_RESULT));
unknown's avatar
unknown committed
2080
    res=item->str_result(&tmp);
2081 2082 2083 2084 2085 2086 2087 2088
    if (res && !my_charset_same(write_cs, res->charset()) &&
        !my_charset_same(write_cs, &my_charset_bin))
    {
      const char *well_formed_error_pos;
      const char *cannot_convert_error_pos;
      const char *from_end_pos;
      const char *error_pos;
      uint32 bytes;
2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100
      uint64 estimated_bytes=
        ((uint64) res->length() / res->charset()->mbminlen + 1) *
        write_cs->mbmaxlen + 1;
      set_if_smaller(estimated_bytes, UINT_MAX32);
      if (cvt_str.realloc((uint32) estimated_bytes))
      {
        my_error(ER_OUTOFMEMORY, MYF(0), (uint32) estimated_bytes);
        goto err;
      }

      bytes= well_formed_copy_nchars(write_cs, (char *) cvt_str.ptr(),
                                     cvt_str.alloced_length(),
2101
                                     res->charset(), res->ptr(), res->length(),
2102 2103
                                     UINT_MAX32, // copy all input chars,
                                                 // i.e. ignore nchars parameter
2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120
                                     &well_formed_error_pos,
                                     &cannot_convert_error_pos,
                                     &from_end_pos);
      error_pos= well_formed_error_pos ? well_formed_error_pos
                                       : cannot_convert_error_pos;
      if (error_pos)
      {
        char printable_buff[32];
        convert_to_printable(printable_buff, sizeof(printable_buff),
                             error_pos, res->ptr() + res->length() - error_pos,
                             res->charset(), 6);
        push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                            ER_TRUNCATED_WRONG_VALUE_FOR_FIELD,
                            ER(ER_TRUNCATED_WRONG_VALUE_FOR_FIELD),
                            "string", printable_buff,
                            item->name, row_count);
      }
2121 2122 2123 2124 2125 2126 2127 2128 2129
      else if (from_end_pos < res->ptr() + res->length())
      { 
        /*
          result is longer than UINT_MAX32 and doesn't fit into String
        */
        push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                            WARN_DATA_TRUNCATED, ER(WARN_DATA_TRUNCATED),
                            item->full_name(), row_count);
      }
2130 2131 2132
      cvt_str.length(bytes);
      res= &cvt_str;
    }
2133
    if (res && enclosed)
unknown's avatar
unknown committed
2134
    {
2135
      if (my_b_write(&cache,(uchar*) exchange->enclosed->ptr(),
unknown's avatar
unknown committed
2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146
		     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';
2147
	  if (my_b_write(&cache,(uchar*) null_buff,2))
unknown's avatar
unknown committed
2148 2149
	    goto err;
	}
2150
	else if (my_b_write(&cache,(uchar*) "NULL",4))
unknown's avatar
unknown committed
2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163
	  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();
unknown's avatar
unknown committed
2164 2165
      if ((result_type == STRING_RESULT || is_unsafe_field_sep) &&
           escape_char != -1)
unknown's avatar
unknown committed
2166
      {
2167 2168 2169 2170 2171 2172 2173 2174 2175
        char *pos, *start, *end;
        CHARSET_INFO *res_charset= res->charset();
        CHARSET_INFO *character_set_client= thd->variables.
                                            character_set_client;
        bool check_second_byte= (res_charset == &my_charset_bin) &&
                                 character_set_client->
                                 escape_with_backslash_is_dangerous;
        DBUG_ASSERT(character_set_client->mbmaxlen == 2 ||
                    !character_set_client->escape_with_backslash_is_dangerous);
unknown's avatar
unknown committed
2176 2177 2178 2179 2180
	for (start=pos=(char*) res->ptr(),end=pos+used_length ;
	     pos != end ;
	     pos++)
	{
#ifdef USE_MB
unknown's avatar
unknown committed
2181
	  if (use_mb(res_charset))
unknown's avatar
unknown committed
2182 2183
	  {
	    int l;
unknown's avatar
unknown committed
2184
	    if ((l=my_ismbchar(res_charset, pos, end)))
unknown's avatar
unknown committed
2185 2186 2187 2188 2189 2190
	    {
	      pos += l-1;
	      continue;
	    }
	  }
#endif
2191 2192 2193 2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223

          /*
            Special case when dumping BINARY/VARBINARY/BLOB values
            for the clients with character sets big5, cp932, gbk and sjis,
            which can have the escape character (0x5C "\" by default)
            as the second byte of a multi-byte sequence.
            
            If
            - pos[0] is a valid multi-byte head (e.g 0xEE) and
            - pos[1] is 0x00, which will be escaped as "\0",
            
            then we'll get "0xEE + 0x5C + 0x30" in the output file.
            
            If this file is later loaded using this sequence of commands:
            
            mysql> create table t1 (a varchar(128)) character set big5;
            mysql> LOAD DATA INFILE 'dump.txt' INTO TABLE t1;
            
            then 0x5C will be misinterpreted as the second byte
            of a multi-byte character "0xEE + 0x5C", instead of
            escape character for 0x00.
            
            To avoid this confusion, we'll escape the multi-byte
            head character too, so the sequence "0xEE + 0x00" will be
            dumped as "0x5C + 0xEE + 0x5C + 0x30".
            
            Note, in the condition below we only check if
            mbcharlen is equal to 2, because there are no
            character sets with mbmaxlen longer than 2
            and with escape_with_backslash_is_dangerous set.
            DBUG_ASSERT before the loop makes that sure.
          */

2224 2225 2226 2227 2228 2229 2230 2231 2232
          if ((NEED_ESCAPING(*pos) ||
               (check_second_byte &&
                my_mbcharlen(character_set_client, (uchar) *pos) == 2 &&
                pos + 1 < end &&
                NEED_ESCAPING(pos[1]))) &&
              /*
               Don't escape field_term_char by doubling - doubling is only
               valid for ENCLOSED BY characters:
              */
unknown's avatar
unknown committed
2233 2234
              (enclosed || !is_ambiguous_field_term ||
               (int) (uchar) *pos != field_term_char))
2235
          {
unknown's avatar
unknown committed
2236
	    char tmp_buff[2];
unknown's avatar
unknown committed
2237
            tmp_buff[0]= ((int) (uchar) *pos == field_sep_char &&
unknown's avatar
unknown committed
2238 2239
                          is_ambiguous_field_sep) ?
                          field_sep_char : escape_char;
unknown's avatar
unknown committed
2240
	    tmp_buff[1]= *pos ? *pos : '0';
2241 2242
	    if (my_b_write(&cache,(uchar*) start,(uint) (pos-start)) ||
		my_b_write(&cache,(uchar*) tmp_buff,2))
unknown's avatar
unknown committed
2243 2244 2245 2246
	      goto err;
	    start=pos+1;
	  }
	}
2247
	if (my_b_write(&cache,(uchar*) start,(uint) (pos-start)))
unknown's avatar
unknown committed
2248 2249
	  goto err;
      }
2250
      else if (my_b_write(&cache,(uchar*) res->ptr(),used_length))
unknown's avatar
unknown committed
2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 2263
	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;
2264
	for (; length > sizeof(space) ; length-=sizeof(space))
unknown's avatar
unknown committed
2265
	{
2266
	  if (my_b_write(&cache,(uchar*) space,sizeof(space)))
unknown's avatar
unknown committed
2267 2268
	    goto err;
	}
2269
	if (my_b_write(&cache,(uchar*) space,length))
unknown's avatar
unknown committed
2270 2271 2272
	  goto err;
      }
    }
2273
    if (res && enclosed)
unknown's avatar
unknown committed
2274
    {
2275
      if (my_b_write(&cache, (uchar*) exchange->enclosed->ptr(),
2276 2277
                     exchange->enclosed->length()))
        goto err;
unknown's avatar
unknown committed
2278 2279 2280
    }
    if (--items_left)
    {
2281
      if (my_b_write(&cache, (uchar*) exchange->field_term->ptr(),
2282 2283
                     field_term_length))
        goto err;
unknown's avatar
unknown committed
2284 2285
    }
  }
2286
  if (my_b_write(&cache,(uchar*) exchange->line_term->ptr(),
unknown's avatar
unknown committed
2287 2288 2289 2290 2291 2292 2293 2294 2295 2296 2297 2298 2299 2300
		 exchange->line_term->length()))
    goto err;
  DBUG_RETURN(0);
err:
  DBUG_RETURN(1);
}


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


int
2301 2302
select_dump::prepare(List<Item> &list __attribute__((unused)),
		     SELECT_LEX_UNIT *u)
unknown's avatar
unknown committed
2303
{
2304
  unit= u;
2305
  return (int) ((file= create_file(thd, path, exchange, &cache)) < 0);
unknown's avatar
unknown committed
2306 2307 2308 2309 2310
}


bool select_dump::send_data(List<Item> &items)
{
unknown's avatar
unknown committed
2311
  List_iterator_fast<Item> li(items);
unknown's avatar
unknown committed
2312
  char buff[MAX_FIELD_WIDTH];
unknown's avatar
unknown committed
2313
  String tmp(buff,sizeof(buff),&my_charset_bin),*res;
unknown's avatar
unknown committed
2314 2315
  tmp.length(0);
  Item *item;
2316
  DBUG_ENTER("select_dump::send_data");
unknown's avatar
unknown committed
2317

2318
  if (unit->offset_limit_cnt)
unknown's avatar
unknown committed
2319
  {						// using limit offset,count
2320
    unit->offset_limit_cnt--;
unknown's avatar
unknown committed
2321 2322 2323 2324
    DBUG_RETURN(0);
  }
  if (row_count++ > 1) 
  {
unknown's avatar
unknown committed
2325
    my_message(ER_TOO_MANY_ROWS, ER(ER_TOO_MANY_ROWS), MYF(0));
unknown's avatar
unknown committed
2326 2327 2328 2329 2330
    goto err;
  }
  while ((item=li++))
  {
    res=item->str_result(&tmp);
2331
    if (!res)					// If NULL
unknown's avatar
unknown committed
2332
    {
2333
      if (my_b_write(&cache,(uchar*) "",1))
2334
	goto err;
unknown's avatar
unknown committed
2335
    }
2336
    else if (my_b_write(&cache,(uchar*) res->ptr(),res->length()))
unknown's avatar
unknown committed
2337
    {
2338
      my_error(ER_ERROR_ON_WRITE, MYF(0), path, my_errno);
unknown's avatar
unknown committed
2339 2340 2341 2342 2343 2344 2345 2346 2347
      goto err;
    }
  }
  DBUG_RETURN(0);
err:
  DBUG_RETURN(1);
}


2348
select_subselect::select_subselect(Item_subselect *item_arg)
2349
{
2350
  item= item_arg;
2351 2352
}

2353

unknown's avatar
unknown committed
2354
bool select_singlerow_subselect::send_data(List<Item> &items)
2355
{
unknown's avatar
unknown committed
2356 2357
  DBUG_ENTER("select_singlerow_subselect::send_data");
  Item_singlerow_subselect *it= (Item_singlerow_subselect *)item;
unknown's avatar
unknown committed
2358 2359
  if (it->assigned())
  {
2360
    my_message(ER_SUBQUERY_NO_1_ROW, ER(ER_SUBQUERY_NO_1_ROW), MYF(0));
unknown's avatar
unknown committed
2361 2362 2363
    DBUG_RETURN(1);
  }
  if (unit->offset_limit_cnt)
unknown's avatar
unknown committed
2364
  {				          // Using limit offset,count
unknown's avatar
unknown committed
2365 2366
    unit->offset_limit_cnt--;
    DBUG_RETURN(0);
2367
  }
unknown's avatar
unknown committed
2368
  List_iterator_fast<Item> li(items);
2369 2370 2371
  Item *val_item;
  for (uint i= 0; (val_item= li++); i++)
    it->store(i, val_item);
unknown's avatar
unknown committed
2372
  it->assigned(1);
unknown's avatar
unknown committed
2373
  DBUG_RETURN(0);
2374
}
unknown's avatar
unknown committed
2375

2376

2377 2378 2379 2380 2381 2382 2383 2384
void select_max_min_finder_subselect::cleanup()
{
  DBUG_ENTER("select_max_min_finder_subselect::cleanup");
  cache= 0;
  DBUG_VOID_RETURN;
}


2385 2386 2387
bool select_max_min_finder_subselect::send_data(List<Item> &items)
{
  DBUG_ENTER("select_max_min_finder_subselect::send_data");
2388
  Item_maxmin_subselect *it= (Item_maxmin_subselect *)item;
2389 2390
  List_iterator_fast<Item> li(items);
  Item *val_item= li++;
2391
  it->register_value();
2392 2393 2394 2395 2396 2397 2398 2399 2400 2401
  if (it->assigned())
  {
    cache->store(val_item);
    if ((this->*op)())
      it->store(0, cache);
  }
  else
  {
    if (!cache)
    {
2402
      cache= Item_cache::get_cache(val_item);
2403 2404 2405 2406 2407 2408 2409 2410 2411 2412 2413
      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;
unknown's avatar
unknown committed
2414 2415 2416
      case DECIMAL_RESULT:
        op= &select_max_min_finder_subselect::cmp_decimal;
        break;
2417 2418 2419 2420 2421 2422 2423 2424 2425 2426 2427 2428 2429 2430 2431
      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()
{
2432
  Item *maxmin= ((Item_singlerow_subselect *)item)->element_index(0);
2433
  double val1= cache->val_real(), val2= maxmin->val_real();
2434 2435 2436 2437
  if (fmax)
    return (cache->null_value && !maxmin->null_value) ||
      (!cache->null_value && !maxmin->null_value &&
       val1 > val2);
2438 2439 2440
  return (maxmin->null_value && !cache->null_value) ||
    (!cache->null_value && !maxmin->null_value &&
     val1 < val2);
2441 2442 2443 2444
}

bool select_max_min_finder_subselect::cmp_int()
{
2445
  Item *maxmin= ((Item_singlerow_subselect *)item)->element_index(0);
2446 2447 2448 2449 2450
  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);
2451 2452 2453
  return (maxmin->null_value && !cache->null_value) ||
    (!cache->null_value && !maxmin->null_value &&
     val1 < val2);
2454 2455
}

unknown's avatar
unknown committed
2456 2457
bool select_max_min_finder_subselect::cmp_decimal()
{
2458
  Item *maxmin= ((Item_singlerow_subselect *)item)->element_index(0);
unknown's avatar
unknown committed
2459 2460 2461 2462 2463 2464
  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) ;
2465 2466 2467
  return (maxmin->null_value && !cache->null_value) ||
    (!cache->null_value && !maxmin->null_value &&
     my_decimal_cmp(cvalue,mvalue) < 0);
unknown's avatar
unknown committed
2468 2469
}

2470 2471 2472
bool select_max_min_finder_subselect::cmp_str()
{
  String *val1, *val2, buf1, buf2;
2473
  Item *maxmin= ((Item_singlerow_subselect *)item)->element_index(0);
2474 2475 2476 2477 2478 2479 2480 2481 2482 2483
  /*
    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) ;
2484 2485 2486
  return (maxmin->null_value && !cache->null_value) ||
    (!cache->null_value && !maxmin->null_value &&
     sortcmp(val1, val2, cache->collation.collation) < 0);
2487 2488
}

unknown's avatar
unknown committed
2489 2490 2491 2492 2493 2494 2495 2496 2497 2498
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;
unknown's avatar
unknown committed
2499
  it->assigned(1);
unknown's avatar
unknown committed
2500 2501 2502
  DBUG_RETURN(0);
}

unknown's avatar
unknown committed
2503 2504

/***************************************************************************
2505
  Dump of select to variables
unknown's avatar
unknown committed
2506
***************************************************************************/
2507

2508
int select_dumpvar::prepare(List<Item> &list, SELECT_LEX_UNIT *u)
unknown's avatar
unknown committed
2509
{
2510
  unit= u;
2511
  
2512
  if (var_list.elements != list.elements)
unknown's avatar
unknown committed
2513
  {
unknown's avatar
unknown committed
2514 2515
    my_message(ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT,
               ER(ER_WRONG_NUMBER_OF_COLUMNS_IN_SELECT), MYF(0));
2516
    return 1;
2517
  }               
2518 2519
  return 0;
}
2520

2521

2522 2523 2524 2525 2526 2527 2528
bool select_dumpvar::check_simple_select() const
{
  my_error(ER_SP_BAD_CURSOR_SELECT, MYF(0));
  return TRUE;
}


2529 2530
void select_dumpvar::cleanup()
{
2531
  row_count= 0;
2532 2533 2534
}


unknown's avatar
unknown committed
2535
Query_arena::Type Query_arena::type() const
2536
{
unknown's avatar
unknown committed
2537
  DBUG_ASSERT(0); /* Should never be called */
2538
  return STATEMENT;
2539 2540 2541
}


2542 2543 2544 2545 2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556
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;
}


2557 2558 2559 2560 2561 2562 2563 2564 2565 2566
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()
{
2567
  DBUG_ASSERT(! "Query_arena::cleanup_stmt() not implemented");
2568 2569
}

2570
/*
unknown's avatar
unknown committed
2571
  Statement functions
2572 2573
*/

2574 2575 2576
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),
unknown's avatar
unknown committed
2577
  id(id_arg),
2578
  mark_used_columns(MARK_COLUMNS_READ),
2579
  lex(lex_arg),
2580 2581 2582
  cursor(0),
  db(NULL),
  db_length(0)
2583
{
2584 2585
  query_string.length= 0;
  query_string.str= NULL;
2586
  name.str= NULL;
2587 2588 2589
}


unknown's avatar
unknown committed
2590
Query_arena::Type Statement::type() const
2591 2592 2593 2594 2595 2596 2597 2598
{
  return STATEMENT;
}


void Statement::set_statement(Statement *stmt)
{
  id=             stmt->id;
2599
  mark_used_columns=   stmt->mark_used_columns;
2600
  lex=            stmt->lex;
2601
  query_string=   stmt->query_string;
2602
  cursor=         stmt->cursor;
2603 2604 2605
}


2606 2607 2608
void
Statement::set_n_backup_statement(Statement *stmt, Statement *backup)
{
2609
  DBUG_ENTER("Statement::set_n_backup_statement");
2610 2611
  backup->set_statement(this);
  set_statement(stmt);
2612
  DBUG_VOID_RETURN;
2613 2614 2615 2616 2617
}


void Statement::restore_backup_statement(Statement *stmt, Statement *backup)
{
2618
  DBUG_ENTER("Statement::restore_backup_statement");
2619 2620
  stmt->set_statement(this);
  set_statement(backup);
2621
  DBUG_VOID_RETURN;
2622 2623 2624
}


2625 2626 2627 2628 2629 2630 2631 2632 2633
/** Assign a new value to thd->query.  */

void Statement::set_query_inner(char *query_arg, uint32 query_length_arg)
{
  query_string.str= query_arg;
  query_string.length= query_length_arg;
}


2634
void THD::end_statement()
2635
{
2636
  /* Cleanup SQL processing state to reuse this statement in next query. */
2637 2638 2639
  lex_end(lex);
  delete lex->result;
  lex->result= 0;
2640 2641
  /* Note that free_list is freed in cleanup_after_query() */

2642 2643 2644 2645 2646 2647 2648
  /*
    Don't free mem_root, as mem_root is freed in the end of dispatch_command
    (once for any command).
  */
}


unknown's avatar
unknown committed
2649
void THD::set_n_backup_active_arena(Query_arena *set, Query_arena *backup)
unknown's avatar
unknown committed
2650
{
unknown's avatar
unknown committed
2651
  DBUG_ENTER("THD::set_n_backup_active_arena");
2652
  DBUG_ASSERT(backup->is_backup_arena == FALSE);
2653

unknown's avatar
unknown committed
2654 2655
  backup->set_query_arena(this);
  set_query_arena(set);
unknown's avatar
unknown committed
2656
#ifndef DBUG_OFF
2657
  backup->is_backup_arena= TRUE;
unknown's avatar
unknown committed
2658
#endif
2659
  DBUG_VOID_RETURN;
unknown's avatar
unknown committed
2660 2661 2662
}


unknown's avatar
unknown committed
2663
void THD::restore_active_arena(Query_arena *set, Query_arena *backup)
2664
{
unknown's avatar
unknown committed
2665
  DBUG_ENTER("THD::restore_active_arena");
2666
  DBUG_ASSERT(backup->is_backup_arena);
unknown's avatar
unknown committed
2667 2668
  set->set_query_arena(this);
  set_query_arena(backup);
unknown's avatar
unknown committed
2669
#ifndef DBUG_OFF
2670
  backup->is_backup_arena= FALSE;
2671
#endif
unknown's avatar
unknown committed
2672
  DBUG_VOID_RETURN;
2673 2674
}

2675 2676 2677 2678 2679 2680
Statement::~Statement()
{
}

C_MODE_START

2681 2682
static uchar *
get_statement_id_as_hash_key(const uchar *record, size_t *key_length,
2683 2684 2685 2686
                             my_bool not_used __attribute__((unused)))
{
  const Statement *statement= (const Statement *) record; 
  *key_length= sizeof(statement->id);
2687
  return (uchar *) &((const Statement *) statement)->id;
2688 2689 2690 2691 2692 2693 2694
}

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

2695
static uchar *get_stmt_name_hash_key(Statement *entry, size_t *length,
2696
                                    my_bool not_used __attribute__((unused)))
2697
{
2698 2699
  *length= entry->name.length;
  return (uchar*) entry->name.str;
2700 2701
}

2702 2703 2704 2705 2706
C_MODE_END

Statement_map::Statement_map() :
  last_found_statement(0)
{
2707 2708 2709 2710 2711
  enum
  {
    START_STMT_HASH_SIZE = 16,
    START_NAME_HASH_SIZE = 16
  };
Konstantin Osipov's avatar
Konstantin Osipov committed
2712 2713 2714 2715 2716 2717
  my_hash_init(&st_hash, &my_charset_bin, START_STMT_HASH_SIZE, 0, 0,
               get_statement_id_as_hash_key,
               delete_statement_as_hash_key, MYF(0));
  my_hash_init(&names_hash, system_charset_info, START_NAME_HASH_SIZE, 0, 0,
               (my_hash_get_key) get_stmt_name_hash_key,
               NULL,MYF(0));
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
/*
  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)
2743
{
2744
  if (my_hash_insert(&st_hash, (uchar*) statement))
2745
  {
2746 2747 2748 2749 2750 2751 2752 2753
    /*
      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;
  }
2754
  if (statement->name.str && my_hash_insert(&names_hash, (uchar*) statement))
2755
  {
2756 2757
    my_error(ER_OUT_OF_RESOURCES, MYF(0));
    goto err_names_hash;
2758
  }
Marc Alff's avatar
Marc Alff committed
2759
  mysql_mutex_lock(&LOCK_prepared_stmt_count);
2760 2761 2762 2763 2764 2765 2766 2767 2768
  /*
    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)
  {
Marc Alff's avatar
Marc Alff committed
2769
    mysql_mutex_unlock(&LOCK_prepared_stmt_count);
2770 2771
    my_error(ER_MAX_PREPARED_STMT_COUNT_REACHED, MYF(0),
             max_prepared_stmt_count);
2772 2773 2774
    goto err_max;
  }
  prepared_stmt_count++;
Marc Alff's avatar
Marc Alff committed
2775
  mysql_mutex_unlock(&LOCK_prepared_stmt_count);
2776

2777
  last_found_statement= statement;
2778 2779 2780 2781
  return 0;

err_max:
  if (statement->name.str)
Konstantin Osipov's avatar
Konstantin Osipov committed
2782
    my_hash_delete(&names_hash, (uchar*) statement);
2783
err_names_hash:
Konstantin Osipov's avatar
Konstantin Osipov committed
2784
  my_hash_delete(&st_hash, (uchar*) statement);
2785 2786
err_st_hash:
  return 1;
2787 2788
}

2789

2790 2791
void Statement_map::close_transient_cursors()
{
2792
#ifdef TO_BE_IMPLEMENTED
2793 2794 2795
  Statement *stmt;
  while ((stmt= transient_cursor_list.head()))
    stmt->close_cursor();                 /* deletes itself from the list */
2796
#endif
2797 2798 2799
}


2800 2801 2802 2803 2804
void Statement_map::erase(Statement *statement)
{
  if (statement == last_found_statement)
    last_found_statement= 0;
  if (statement->name.str)
Konstantin Osipov's avatar
Konstantin Osipov committed
2805
    my_hash_delete(&names_hash, (uchar *) statement);
2806

Konstantin Osipov's avatar
Konstantin Osipov committed
2807
  my_hash_delete(&st_hash, (uchar *) statement);
Marc Alff's avatar
Marc Alff committed
2808
  mysql_mutex_lock(&LOCK_prepared_stmt_count);
2809 2810
  DBUG_ASSERT(prepared_stmt_count > 0);
  prepared_stmt_count--;
Marc Alff's avatar
Marc Alff committed
2811
  mysql_mutex_unlock(&LOCK_prepared_stmt_count);
2812 2813 2814 2815 2816 2817
}


void Statement_map::reset()
{
  /* Must be first, hash_free will reset st_hash.records */
Marc Alff's avatar
Marc Alff committed
2818
  mysql_mutex_lock(&LOCK_prepared_stmt_count);
2819 2820
  DBUG_ASSERT(prepared_stmt_count >= st_hash.records);
  prepared_stmt_count-= st_hash.records;
Marc Alff's avatar
Marc Alff committed
2821
  mysql_mutex_unlock(&LOCK_prepared_stmt_count);
2822 2823 2824 2825

  my_hash_reset(&names_hash);
  my_hash_reset(&st_hash);
  last_found_statement= 0;
2826 2827
}

2828

2829 2830 2831
Statement_map::~Statement_map()
{
  /* Must go first, hash_free will reset st_hash.records */
Marc Alff's avatar
Marc Alff committed
2832
  mysql_mutex_lock(&LOCK_prepared_stmt_count);
2833 2834
  DBUG_ASSERT(prepared_stmt_count >= st_hash.records);
  prepared_stmt_count-= st_hash.records;
Marc Alff's avatar
Marc Alff committed
2835
  mysql_mutex_unlock(&LOCK_prepared_stmt_count);
2836

Konstantin Osipov's avatar
Konstantin Osipov committed
2837 2838
  my_hash_free(&names_hash);
  my_hash_free(&st_hash);
2839 2840
}

2841 2842
bool select_dumpvar::send_data(List<Item> &items)
{
2843
  List_iterator_fast<my_var> var_li(var_list);
2844
  List_iterator<Item> it(items);
2845
  Item *item;
2846
  my_var *mv;
2847
  DBUG_ENTER("select_dumpvar::send_data");
2848

2849
  if (unit->offset_limit_cnt)
2850
  {						// using limit offset,count
2851 2852 2853
    unit->offset_limit_cnt--;
    DBUG_RETURN(0);
  }
2854 2855
  if (row_count++) 
  {
unknown's avatar
unknown committed
2856
    my_message(ER_TOO_MANY_ROWS, ER(ER_TOO_MANY_ROWS), MYF(0));
2857 2858
    DBUG_RETURN(1);
  }
2859
  while ((mv= var_li++) && (item= it++))
unknown's avatar
unknown committed
2860
  {
2861
    if (mv->local)
unknown's avatar
unknown committed
2862
    {
2863 2864
      if (thd->spcont->set_variable(thd, mv->offset, &item))
	    DBUG_RETURN(1);
unknown's avatar
unknown committed
2865 2866 2867
    }
    else
    {
2868
      Item_func_set_user_var *suv= new Item_func_set_user_var(mv->s, item);
2869 2870
      if (suv->fix_fields(thd, 0))
        DBUG_RETURN (1);
2871
      suv->save_item_result(item);
2872 2873
      if (suv->update())
        DBUG_RETURN (1);
unknown's avatar
unknown committed
2874
    }
unknown's avatar
unknown committed
2875
  }
2876
  DBUG_RETURN(thd->is_error());
unknown's avatar
unknown committed
2877 2878 2879 2880
}

bool select_dumpvar::send_eof()
{
2881
  if (! row_count)
unknown's avatar
unknown committed
2882 2883
    push_warning(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
                 ER_SP_FETCH_NO_DATA, ER(ER_SP_FETCH_NO_DATA));
2884 2885 2886 2887 2888
  /*
    In order to remember the value of affected rows for ROW_COUNT()
    function, SELECT INTO has to have an own SQLCOM.
    TODO: split from SQLCOM_SELECT
  */
2889
  ::my_ok(thd,row_count);
2890
  return 0;
unknown's avatar
unknown committed
2891
}
2892 2893 2894 2895 2896 2897 2898

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

void TMP_TABLE_PARAM::init()
{
2899 2900
  DBUG_ENTER("TMP_TABLE_PARAM::init");
  DBUG_PRINT("enter", ("this: 0x%lx", (ulong)this));
2901 2902 2903
  field_count= sum_func_count= func_count= hidden_field_count= 0;
  group_parts= group_length= group_null_parts= 0;
  quick_group= 1;
unknown's avatar
unknown committed
2904
  table_charset= 0;
2905
  precomputed_group_by= 0;
2906
  DBUG_VOID_RETURN;
2907
}
2908 2909 2910 2911


void thd_increment_bytes_sent(ulong length)
{
unknown's avatar
unknown committed
2912
  THD *thd=current_thd;
unknown's avatar
unknown committed
2913
  if (likely(thd != 0))
unknown's avatar
unknown committed
2914 2915 2916
  { /* current_thd==0 when close_connection() calls net_send_error() */
    thd->status_var.bytes_sent+= length;
  }
2917 2918 2919 2920 2921 2922 2923 2924 2925 2926 2927 2928 2929 2930 2931 2932 2933 2934 2935
}


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));
}
2936

2937

2938
void Security_context::init()
2939 2940 2941
{
  host= user= priv_user= ip= 0;
  host_or_ip= "connecting host";
2942
  priv_host[0]= '\0';
2943
  master_access= 0;
2944 2945 2946 2947 2948 2949
#ifndef NO_EMBEDDED_ACCESS_CHECKS
  db_access= NO_ACCESS;
#endif
}


2950
void Security_context::destroy()
2951 2952 2953 2954 2955 2956 2957 2958 2959 2960
{
  // If not pointer to constant
  if (host != my_localhost)
    safeFree(host);
  if (user != delayed_user)
    safeFree(user);
  safeFree(ip);
}


2961
void Security_context::skip_grants()
2962 2963 2964 2965 2966 2967 2968 2969 2970
{
  /* privileges for the user are unknown everything is allowed */
  host_or_ip= (char *)"";
  master_access= ~NO_ACCESS;
  priv_user= (char *)"";
  *priv_host= '\0';
}


2971 2972 2973 2974 2975 2976 2977
bool Security_context::set_user(char *user_arg)
{
  safeFree(user);
  user= my_strdup(user_arg, MYF(0));
  return user == 0;
}

2978 2979 2980 2981 2982
#ifndef NO_EMBEDDED_ACCESS_CHECKS
/**
  Initialize this security context from the passed in credentials
  and activate it in the current thread.

unknown's avatar
unknown committed
2983 2984 2985 2986
  @param       thd
  @param       definer_user
  @param       definer_host
  @param       db
2987 2988 2989 2990 2991 2992 2993 2994 2995 2996 2997 2998 2999 3000 3001 3002 3003 3004 3005 3006 3007 3008 3009 3010 3011 3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 3024 3025 3026 3027 3028 3029 3030 3031 3032 3033 3034 3035 3036 3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 3061 3062 3063 3064 3065 3066 3067 3068 3069 3070 3071 3072 3073 3074 3075 3076 3077
  @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
unknown's avatar
unknown committed
3078

3079

3080 3081 3082 3083 3084 3085 3086
bool Security_context::user_matches(Security_context *them)
{
  return ((user != NULL) && (them->user != NULL) &&
          !strcmp(user, them->user));
}


3087 3088 3089 3090 3091 3092 3093 3094
/****************************************************************************
  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.
****************************************************************************/

3095
void THD::reset_n_backup_open_tables_state(Open_tables_backup *backup)
3096
{
3097 3098
  DBUG_ENTER("reset_n_backup_open_tables_state");
  backup->set_open_tables_state(this);
3099
  backup->mdl_system_tables_svp= mdl_context.mdl_savepoint();
3100
  reset_open_tables_state(this);
3101
  state_flags|= Open_tables_state::BACKUPS_AVAIL;
3102
  DBUG_VOID_RETURN;
3103 3104 3105
}


3106
void THD::restore_backup_open_tables_state(Open_tables_backup *backup)
3107 3108
{
  DBUG_ENTER("restore_backup_open_tables_state");
3109
  mdl_context.rollback_to_savepoint(backup->mdl_system_tables_svp);
3110 3111 3112 3113 3114
  /*
    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 &&
3115
              derived_tables == 0 &&
Konstantin Osipov's avatar
Konstantin Osipov committed
3116 3117
              lock == 0 &&
              locked_tables_mode == LTM_NONE &&
3118
              m_reprepare_observer == NULL);
3119

3120
  set_open_tables_state(backup);
3121 3122
  DBUG_VOID_RETURN;
}
3123

3124 3125 3126 3127 3128 3129 3130 3131 3132 3133
/**
  Check the killed state of a user thread
  @param thd  user thread
  @retval 0 the user thread is active
  @retval 1 the user thread has been killed
*/
extern "C" int thd_killed(const MYSQL_THD thd)
{
  return(thd->killed);
}
3134

3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145
/**
  Return the thread id of a user thread
  @param thd user thread
  @return thread id
*/
extern "C" unsigned long thd_get_thread_id(const MYSQL_THD thd)
{
  return((unsigned long)thd->thread_id);
}


3146 3147 3148 3149 3150 3151
#ifdef INNODB_COMPATIBILITY_HOOKS
extern "C" struct charset_info_st *thd_charset(MYSQL_THD thd)
{
  return(thd->charset());
}

3152 3153 3154 3155
/**
  OBSOLETE : there's no way to ensure the string is null terminated.
  Use thd_query_string instead()
*/
3156 3157
extern "C" char **thd_query(MYSQL_THD thd)
{
3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169
  return(&thd->query_string.str);
}

/**
  Get the current query string for the thread.

  @param The MySQL internal thread pointer
  @return query string and length. May be non-null-terminated.
*/
extern "C" LEX_STRING * thd_query_string (MYSQL_THD thd)
{
  return(&thd->query_string);
3170 3171 3172 3173 3174 3175
}

extern "C" int thd_slave_thread(const MYSQL_THD thd)
{
  return(thd->slave_thread);
}
3176

3177 3178
extern "C" int thd_non_transactional_update(const MYSQL_THD thd)
{
3179
  return(thd->transaction.all.modified_non_trans_table);
3180 3181
}

3182
extern "C" int thd_binlog_format(const MYSQL_THD thd)
3183
{
3184
  if (mysql_bin_log.is_open() && (thd->variables.option_bits & OPTION_BIN_LOG))
3185 3186 3187
    return (int) thd->variables.binlog_format;
  else
    return BINLOG_FORMAT_UNSPEC;
3188
}
3189 3190 3191 3192 3193

extern "C" void thd_mark_transaction_to_rollback(MYSQL_THD thd, bool all)
{
  mark_transaction_to_rollback(thd, all);
}
3194 3195 3196 3197 3198

extern "C" bool thd_binlog_filter_ok(const MYSQL_THD thd)
{
  return binlog_filter->db_ok(thd->db);
}
3199
#endif // INNODB_COMPATIBILITY_HOOKS */
3200

3201 3202 3203 3204 3205 3206 3207 3208 3209 3210 3211 3212 3213
/****************************************************************************
  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
3214
  - Value of last_insert_id() is saved and restored
3215 3216 3217 3218
  - 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
3219
  - new savepoint level is created and destroyed
3220 3221 3222 3223 3224 3225

  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.
3226 3227

    We do not reset value of last_insert_id().
3228 3229 3230 3231 3232
****************************************************************************/

void THD::reset_sub_statement_state(Sub_statement_state *backup,
                                    uint new_state)
{
3233 3234 3235 3236 3237 3238 3239
#ifndef EMBEDDED_LIBRARY
  /* BUG#33029, if we are replicating from a buggy master, reset
     auto_inc_intervals_forced to prevent substatement
     (triggers/functions) from using erroneous INSERT_ID value
   */
  if (rpl_master_erroneous_autoinc(this))
  {
3240 3241
    DBUG_ASSERT(backup->auto_inc_intervals_forced.nb_elements() == 0);
    auto_inc_intervals_forced.swap(&backup->auto_inc_intervals_forced);
3242 3243 3244
  }
#endif
  
3245
  backup->option_bits=     variables.option_bits;
3246
  backup->count_cuted_fields= count_cuted_fields;
3247 3248 3249 3250 3251 3252 3253
  backup->in_sub_stmt=     in_sub_stmt;
  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;
3254
  backup->savepoints= transaction.savepoints;
3255 3256 3257 3258
  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;
3259

3260
  if ((!lex->requires_prelocking() || is_update_query(lex->sql_command)) &&
3261
      !is_current_stmt_binlog_format_row())
3262
  {
3263
    variables.option_bits&= ~OPTION_BIN_LOG;
3264
  }
3265

unknown's avatar
unknown committed
3266 3267 3268
  if ((backup->option_bits & OPTION_BIN_LOG) &&
       is_update_query(lex->sql_command) &&
       !is_current_stmt_binlog_format_row())
3269 3270
    mysql_bin_log.start_union_events(this, this->query_id);

3271 3272 3273 3274 3275 3276
  /* Disable result sets */
  client_capabilities &= ~CLIENT_MULTI_RESULTS;
  in_sub_stmt|= new_state;
  examined_row_count= 0;
  sent_row_count= 0;
  cuted_fields= 0;
3277
  transaction.savepoints= 0;
3278
  first_successful_insert_id_in_cur_stmt= 0;
3279 3280 3281 3282 3283
}


void THD::restore_sub_statement_state(Sub_statement_state *backup)
{
3284
  DBUG_ENTER("THD::restore_sub_statement_state");
3285 3286 3287 3288 3289 3290 3291
#ifndef EMBEDDED_LIBRARY
  /* BUG#33029, if we are replicating from a buggy master, restore
     auto_inc_intervals_forced so that the top statement can use the
     INSERT_ID value set before this statement.
   */
  if (rpl_master_erroneous_autoinc(this))
  {
3292 3293
    backup->auto_inc_intervals_forced.swap(&auto_inc_intervals_forced);
    DBUG_ASSERT(backup->auto_inc_intervals_forced.nb_elements() == 0);
3294 3295 3296
  }
#endif

3297 3298 3299 3300 3301 3302 3303 3304 3305 3306 3307 3308 3309 3310
  /*
    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);
  }
3311
  count_cuted_fields= backup->count_cuted_fields;
3312
  transaction.savepoints= backup->savepoints;
3313
  variables.option_bits= backup->option_bits;
3314 3315
  in_sub_stmt=      backup->in_sub_stmt;
  enable_slow_log=  backup->enable_slow_log;
3316 3317 3318 3319
  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;
3320 3321 3322
  limit_found_rows= backup->limit_found_rows;
  sent_row_count=   backup->sent_row_count;
  client_capabilities= backup->client_capabilities;
3323 3324 3325 3326 3327 3328 3329
  /*
    If we've left sub-statement mode, reset the fatal error flag.
    Otherwise keep the current value, to propagate it up the sub-statement
    stack.
  */
  if (!in_sub_stmt)
    is_fatal_sub_stmt_error= FALSE;
3330

3331
  if ((variables.option_bits & OPTION_BIN_LOG) && is_update_query(lex->sql_command) &&
unknown's avatar
unknown committed
3332
       !is_current_stmt_binlog_format_row())
3333
    mysql_bin_log.stop_union_events(this);
3334

3335 3336 3337 3338 3339 3340
  /*
    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;
3341
  DBUG_VOID_RETURN;
3342
}
3343 3344


3345 3346
void THD::set_statement(Statement *stmt)
{
Marc Alff's avatar
Marc Alff committed
3347
  mysql_mutex_lock(&LOCK_thd_data);
3348
  Statement::set_statement(stmt);
Marc Alff's avatar
Marc Alff committed
3349
  mysql_mutex_unlock(&LOCK_thd_data);
3350 3351 3352 3353 3354 3355 3356
}


/** Assign a new value to thd->query.  */

void THD::set_query(char *query_arg, uint32 query_length_arg)
{
Marc Alff's avatar
Marc Alff committed
3357
  mysql_mutex_lock(&LOCK_thd_data);
3358
  set_query_inner(query_arg, query_length_arg);
Marc Alff's avatar
Marc Alff committed
3359
  mysql_mutex_unlock(&LOCK_thd_data);
3360 3361
}

3362 3363 3364 3365 3366
/** Assign a new value to thd->query and thd->query_id.  */

void THD::set_query_and_id(char *query_arg, uint32 query_length_arg,
                           query_id_t new_query_id)
{
Marc Alff's avatar
Marc Alff committed
3367
  mysql_mutex_lock(&LOCK_thd_data);
3368 3369
  set_query_inner(query_arg, query_length_arg);
  query_id= new_query_id;
Marc Alff's avatar
Marc Alff committed
3370
  mysql_mutex_unlock(&LOCK_thd_data);
3371 3372 3373 3374 3375 3376
}

/** Assign a new value to thd->query_id.  */

void THD::set_query_id(query_id_t new_query_id)
{
Marc Alff's avatar
Marc Alff committed
3377
  mysql_mutex_lock(&LOCK_thd_data);
3378
  query_id= new_query_id;
Marc Alff's avatar
Marc Alff committed
3379
  mysql_mutex_unlock(&LOCK_thd_data);
3380 3381
}

3382

3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398
/**
  Leave explicit LOCK TABLES or prelocked mode and restore value of
  transaction sentinel in MDL subsystem.
*/

void THD::leave_locked_tables_mode()
{
  locked_tables_mode= LTM_NONE;
  /* Make sure we don't release the global read lock when leaving LTM. */
  mdl_context.reset_trans_sentinel(global_read_lock.global_shared_lock());
  /* Also ensure that we don't release metadata locks for open HANDLERs. */
  if (handler_tables_hash.records)
    mysql_ha_move_tickets_after_trans_sentinel(this);
}


3399 3400 3401 3402 3403 3404 3405 3406 3407
/**
  Mark transaction to rollback and mark error as fatal to a sub-statement.

  @param  thd   Thread handle
  @param  all   TRUE <=> rollback main transaction.
*/

void mark_transaction_to_rollback(THD *thd, bool all)
{
3408 3409 3410 3411
  if (thd)
  {
    thd->is_fatal_sub_stmt_error= TRUE;
    thd->transaction_rollback_request= all;
3412 3413 3414 3415 3416 3417 3418 3419 3420 3421
    /*
      Aborted transactions can not be IGNOREd.
      Switch off the IGNORE flag for the current
      SELECT_LEX. This should allow my_error()
      to report the error and abort the execution
      flow, even in presence
      of IGNORE clause.
    */
    if (thd->lex->current_select)
      thd->lex->current_select->no_error= FALSE;
3422
  }
3423
}
3424 3425 3426 3427
/***************************************************************************
  Handling of XA id cacheing
***************************************************************************/

Marc Alff's avatar
Marc Alff committed
3428
mysql_mutex_t LOCK_xid_cache;
3429 3430
HASH xid_cache;

3431 3432 3433 3434
extern "C" uchar *xid_get_hash_key(const uchar *, size_t *, my_bool);
extern "C" void xid_free_hash(void *);

uchar *xid_get_hash_key(const uchar *ptr, size_t *length,
3435 3436
                                  my_bool not_used __attribute__((unused)))
{
3437 3438
  *length=((XID_STATE*)ptr)->xid.key_length();
  return ((XID_STATE*)ptr)->xid.key();
3439 3440
}

3441
void xid_free_hash(void *ptr)
3442 3443
{
  if (!((XID_STATE*)ptr)->in_thd)
3444
    my_free((uchar*)ptr, MYF(0));
3445 3446
}

Marc Alff's avatar
Marc Alff committed
3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 3460 3461 3462 3463 3464 3465 3466 3467
#ifdef HAVE_PSI_INTERFACE
static PSI_mutex_key key_LOCK_xid_cache;

static PSI_mutex_info all_xid_mutexes[]=
{
  { &key_LOCK_xid_cache, "LOCK_xid_cache", PSI_FLAG_GLOBAL}
};

static void init_xid_psi_keys(void)
{
  const char* category= "sql";
  int count;

  if (PSI_server == NULL)
    return;

  count= array_elements(all_xid_mutexes);
  PSI_server->register_mutex(category, all_xid_mutexes, count);
}
#endif /* HAVE_PSI_INTERFACE */

3468 3469
bool xid_cache_init()
{
Marc Alff's avatar
Marc Alff committed
3470 3471 3472 3473 3474
#ifdef HAVE_PSI_INTERFACE
  init_xid_psi_keys();
#endif

  mysql_mutex_init(key_LOCK_xid_cache, &LOCK_xid_cache, MY_MUTEX_INIT_FAST);
Konstantin Osipov's avatar
Konstantin Osipov committed
3475 3476
  return my_hash_init(&xid_cache, &my_charset_bin, 100, 0, 0,
                      xid_get_hash_key, xid_free_hash, 0) != 0;
3477 3478 3479 3480
}

void xid_cache_free()
{
Konstantin Osipov's avatar
Konstantin Osipov committed
3481
  if (my_hash_inited(&xid_cache))
3482
  {
Konstantin Osipov's avatar
Konstantin Osipov committed
3483
    my_hash_free(&xid_cache);
Marc Alff's avatar
Marc Alff committed
3484
    mysql_mutex_destroy(&LOCK_xid_cache);
3485 3486 3487 3488 3489
  }
}

XID_STATE *xid_cache_search(XID *xid)
{
Marc Alff's avatar
Marc Alff committed
3490
  mysql_mutex_lock(&LOCK_xid_cache);
Konstantin Osipov's avatar
Konstantin Osipov committed
3491 3492
  XID_STATE *res=(XID_STATE *)my_hash_search(&xid_cache, xid->key(),
                                             xid->key_length());
Marc Alff's avatar
Marc Alff committed
3493
  mysql_mutex_unlock(&LOCK_xid_cache);
3494 3495 3496
  return res;
}

3497

3498 3499 3500 3501
bool xid_cache_insert(XID *xid, enum xa_states xa_state)
{
  XID_STATE *xs;
  my_bool res;
Marc Alff's avatar
Marc Alff committed
3502
  mysql_mutex_lock(&LOCK_xid_cache);
Konstantin Osipov's avatar
Konstantin Osipov committed
3503
  if (my_hash_search(&xid_cache, xid->key(), xid->key_length()))
3504 3505 3506 3507 3508 3509 3510 3511
    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;
3512
    res=my_hash_insert(&xid_cache, (uchar*)xs);
3513
  }
Marc Alff's avatar
Marc Alff committed
3514
  mysql_mutex_unlock(&LOCK_xid_cache);
3515 3516 3517
  return res;
}

3518

3519 3520
bool xid_cache_insert(XID_STATE *xid_state)
{
Marc Alff's avatar
Marc Alff committed
3521
  mysql_mutex_lock(&LOCK_xid_cache);
Konstantin Osipov's avatar
Konstantin Osipov committed
3522 3523
  DBUG_ASSERT(my_hash_search(&xid_cache, xid_state->xid.key(),
                             xid_state->xid.key_length())==0);
3524
  my_bool res=my_hash_insert(&xid_cache, (uchar*)xid_state);
Marc Alff's avatar
Marc Alff committed
3525
  mysql_mutex_unlock(&LOCK_xid_cache);
3526 3527 3528
  return res;
}

3529

3530 3531
void xid_cache_delete(XID_STATE *xid_state)
{
Marc Alff's avatar
Marc Alff committed
3532
  mysql_mutex_lock(&LOCK_xid_cache);
Konstantin Osipov's avatar
Konstantin Osipov committed
3533
  my_hash_delete(&xid_cache, (uchar *)xid_state);
Marc Alff's avatar
Marc Alff committed
3534
  mysql_mutex_unlock(&LOCK_xid_cache);
3535 3536
}

Sven Sandberg's avatar
Sven Sandberg committed
3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 3574 3575

/**
  Decide on logging format to use for the statement and issue errors
  or warnings as needed.  The decision depends on the following
  parameters:

  - The logging mode, i.e., the value of binlog_format.  Can be
    statement, mixed, or row.

  - The type of statement.  There are three types of statements:
    "normal" safe statements; unsafe statements; and row injections.
    An unsafe statement is one that, if logged in statement format,
    might produce different results when replayed on the slave (e.g.,
    INSERT DELAYED).  A row injection is either a BINLOG statement, or
    a row event executed by the slave's SQL thread.

  - The capabilities of tables modified by the statement.  The
    *capabilities vector* for a table is a set of flags associated
    with the table.  Currently, it only includes two flags: *row
    capability flag* and *statement capability flag*.

    The row capability flag is set if and only if the engine can
    handle row-based logging. The statement capability flag is set if
    and only if the table can handle statement-based logging.

  Decision table for logging format
  ---------------------------------

  The following table summarizes how the format and generated
  warning/error depends on the tables' capabilities, the statement
  type, and the current binlog_format.

     Row capable        N NNNNNNNNN YYYYYYYYY YYYYYYYYY
     Statement capable  N YYYYYYYYY NNNNNNNNN YYYYYYYYY

     Statement type     * SSSUUUIII SSSUUUIII SSSUUUIII

     binlog_format      * SMRSMRSMR SMRSMRSMR SMRSMRSMR

3576 3577
     Logged format      - SS-S----- -RR-RR-RR SRRSRR-RR
     Warning/Error      1 --2732444 5--5--6-- ---7--6--
Sven Sandberg's avatar
Sven Sandberg committed
3578 3579 3580 3581 3582 3583 3584 3585 3586 3587 3588 3589 3590 3591 3592 3593 3594 3595 3596

  Legend
  ------

  Row capable:    N - Some table not row-capable, Y - All tables row-capable
  Stmt capable:   N - Some table not stmt-capable, Y - All tables stmt-capable
  Statement type: (S)afe, (U)nsafe, or Row (I)njection
  binlog_format:  (S)TATEMENT, (M)IXED, or (R)OW
  Logged format:  (S)tatement or (R)ow
  Warning/Error:  Warnings and error messages are as follows:

  1. Error: Cannot execute statement: binlogging impossible since both
     row-incapable engines and statement-incapable engines are
     involved.

  2. Error: Cannot execute statement: binlogging impossible since
     BINLOG_FORMAT = ROW and at least one table uses a storage engine
     limited to statement-logging.

3597 3598 3599
  3. Error: Cannot execute statement: binlogging of unsafe statement
     is impossible when storage engine is limited to statement-logging
     and BINLOG_FORMAT = MIXED.
Sven Sandberg's avatar
Sven Sandberg committed
3600 3601 3602 3603 3604 3605 3606 3607 3608 3609 3610 3611 3612 3613 3614 3615 3616 3617 3618 3619 3620 3621 3622 3623 3624 3625 3626 3627 3628 3629 3630 3631 3632 3633 3634 3635 3636 3637 3638

  4. Error: Cannot execute row injection: binlogging impossible since
     at least one table uses a storage engine limited to
     statement-logging.

  5. Error: Cannot execute statement: binlogging impossible since
     BINLOG_FORMAT = STATEMENT and at least one table uses a storage
     engine limited to row-logging.

  6. Error: Cannot execute row injection: binlogging impossible since
     BINLOG_FORMAT = STATEMENT.

  7. Warning: Unsafe statement binlogged in statement format since
     BINLOG_FORMAT = STATEMENT.

  In addition, we can produce the following error (not depending on
  the variables of the decision diagram):

  8. Error: Cannot execute statement: binlogging impossible since more
     than one engine is involved and at least one engine is
     self-logging.

  For each error case above, the statement is prevented from being
  logged, we report an error, and roll back the statement.  For
  warnings, we set the thd->binlog_flags variable: the warning will be
  printed only if the statement is successfully logged.

  @see THD::binlog_query

  @param[in] thd    Client thread
  @param[in] tables Tables involved in the query

  @retval 0 No error; statement can be logged.
  @retval -1 One of the error conditions above applies (1, 2, 4, 5, or 6).
*/

int THD::decide_logging_format(TABLE_LIST *tables)
{
  DBUG_ENTER("THD::decide_logging_format");
3639
  DBUG_PRINT("info", ("query: %s", query()));
3640
  DBUG_PRINT("info", ("variables.binlog_format: %u",
Sven Sandberg's avatar
Sven Sandberg committed
3641 3642 3643
                      variables.binlog_format));
  DBUG_PRINT("info", ("lex->get_stmt_unsafe_flags(): 0x%x",
                      lex->get_stmt_unsafe_flags()));
3644 3645 3646 3647 3648 3649

  /*
    We should not decide logging format if the binlog is closed or
    binlogging is off, or if the statement is filtered out from the
    binlog by filtering rules.
  */
unknown's avatar
unknown committed
3650
  if (mysql_bin_log.is_open() && (variables.option_bits & OPTION_BIN_LOG) &&
3651 3652
      !(variables.binlog_format == BINLOG_FORMAT_STMT &&
        !binlog_filter->db_ok(db)))
Sven Sandberg's avatar
Sven Sandberg committed
3653 3654 3655 3656 3657 3658
  {
    /*
      Compute one bit field with the union of all the engine
      capabilities, and one with the intersection of all the engine
      capabilities.
    */
3659
    handler::Table_flags flags_write_some_set= 0;
Sven Sandberg's avatar
Sven Sandberg committed
3660
    handler::Table_flags flags_some_set= 0;
3661
    handler::Table_flags flags_write_all_set=
Sven Sandberg's avatar
Sven Sandberg committed
3662 3663
      HA_BINLOG_ROW_CAPABLE | HA_BINLOG_STMT_CAPABLE;

3664 3665 3666 3667
    /* 
       If different types of engines are about to be updated.
       For example: Innodb and Falcon; Innodb and MyIsam.
    */
3668
    my_bool multi_write_engine= FALSE;
3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685
    /*
       If different types of engines are about to be accessed 
       and any of them is about to be updated. For example:
       Innodb and Falcon; Innodb and MyIsam.
    */
    my_bool multi_access_engine= FALSE;
    /*
       If non-transactional and transactional engines are about
       to be accessed and any of them is about to be updated.
       For example: Innodb and MyIsam.
    */
    my_bool trans_non_trans_access_engines= FALSE;
    /*
       If all engines that are about to be updated are
       transactional.
    */
    my_bool all_trans_write_engines= TRUE;
3686 3687
    TABLE* prev_write_table= NULL;
    TABLE* prev_access_table= NULL;
Sven Sandberg's avatar
Sven Sandberg committed
3688 3689 3690 3691 3692 3693 3694 3695 3696

#ifndef DBUG_OFF
    {
      static const char *prelocked_mode_name[] = {
        "NON_PRELOCKED",
        "PRELOCKED",
        "PRELOCKED_UNDER_LOCK_TABLES",
      };
      DBUG_PRINT("debug", ("prelocked_mode: %s",
3697
                           prelocked_mode_name[locked_tables_mode]));
Sven Sandberg's avatar
Sven Sandberg committed
3698 3699 3700 3701 3702 3703 3704 3705 3706 3707 3708 3709 3710
    }
#endif

    /*
      Get the capabilities vector for all involved storage engines and
      mask out the flags for the binary log.
    */
    for (TABLE_LIST *table= tables; table; table= table->next_global)
    {
      if (table->placeholder())
        continue;
      if (table->table->s->table_category == TABLE_CATEGORY_PERFORMANCE)
        lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_SYSTEM_TABLE);
3711 3712 3713
      handler::Table_flags const flags= table->table->file->ha_table_flags();
      DBUG_PRINT("info", ("table: %s; ha_table_flags: 0x%llx",
                          table->table_name, flags));
Sven Sandberg's avatar
Sven Sandberg committed
3714 3715
      if (table->lock_type >= TL_WRITE_ALLOW_WRITE)
      {
3716 3717
        if (prev_write_table && prev_write_table->file->ht !=
            table->table->file->ht)
3718
          multi_write_engine= TRUE;
3719 3720 3721 3722 3723 3724 3725 3726 3727 3728 3729 3730 3731 3732 3733 3734 3735 3736 3737 3738 3739
        /*
          Every temporary table must be always written to the binary
          log in transaction boundaries and as such we artificially
          classify them as transactional.

          Indirectly, this avoids classifying a temporary table created
          on a non-transactional engine as unsafe when it is modified
          after any transactional table:

          BEGIN;
            INSERT INTO innodb_t VALUES (1);
            INSERT INTO myisam_t_temp VALUES (1);
          COMMIT;

          BINARY LOG:

          BEGIN;
            INSERT INTO innodb_t VALUES (1);
            INSERT INTO myisam_t_temp VALUES (1);
          COMMIT;
        */
3740
        all_trans_write_engines= all_trans_write_engines &&
3741 3742
                                 (table->table->file->has_transactions() ||
                                  table->table->s->tmp_table);
3743
        prev_write_table= table->table;
3744 3745
        flags_write_all_set &= flags;
        flags_write_some_set |= flags;
Sven Sandberg's avatar
Sven Sandberg committed
3746
      }
3747
      flags_some_set |= flags;
3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 3770 3771 3772 3773 3774 3775
      /*
        The mixture of non-transactional and transactional tables must
        identified and classified as unsafe. However, a temporary table
        must be always handled as a transactional table. Based on that,
        we have the following statements classified as mixed and by
        consequence as unsafe:

        1: INSERT INTO myisam_t SELECT * FROM innodb_t;

        2: INSERT INTO innodb_t SELECT * FROM myisam_t;

        3: INSERT INTO myisam_t SELECT * FROM myisam_t_temp;

        4: INSERT INTO myisam_t_temp SELECT * FROM myisam_t;

        5: CREATE TEMPORARY TABLE myisam_t_temp SELECT * FROM mysiam_t;

        The following statements are not considered mixed and as such
        are safe:

        1: INSERT INTO innodb_t SELECT * FROM myisam_t_temp;

        2: INSERT INTO myisam_t_temp SELECT * FROM innodb_t_temp;
      */
      if (!trans_non_trans_access_engines && prev_access_table &&
          (lex->sql_command != SQLCOM_CREATE_TABLE ||
          (lex->sql_command == SQLCOM_CREATE_TABLE &&
          (lex->create_info.options & HA_LEX_CREATE_TMP_TABLE))))
3776
      {
3777 3778 3779 3780 3781 3782 3783 3784 3785 3786 3787 3788 3789 3790 3791
        my_bool prev_trans;
        my_bool act_trans;
        if (prev_access_table->s->tmp_table || table->table->s->tmp_table)
        {
          prev_trans= prev_access_table->s->tmp_table ? TRUE :
                     prev_access_table->file->has_transactions();
          act_trans= table->table->s->tmp_table ? TRUE :
                    table->table->file->has_transactions();
        }
        else
        {
          prev_trans= prev_access_table->file->has_transactions();
          act_trans= table->table->file->has_transactions();
        }
        trans_non_trans_access_engines= (prev_trans != act_trans);
3792
        multi_access_engine= TRUE;
3793
      }
3794
      thread_temporary_used |= table->table->s->tmp_table;
3795
      prev_access_table= table->table;
Sven Sandberg's avatar
Sven Sandberg committed
3796 3797
    }

3798 3799 3800 3801
    DBUG_PRINT("info", ("flags_write_all_set: 0x%llx", flags_write_all_set));
    DBUG_PRINT("info", ("flags_write_some_set: 0x%llx", flags_write_some_set));
    DBUG_PRINT("info", ("flags_some_set: 0x%llx", flags_some_set));
    DBUG_PRINT("info", ("multi_write_engine: %d", multi_write_engine));
3802 3803 3804
    DBUG_PRINT("info", ("multi_access_engine: %d", multi_access_engine));
    DBUG_PRINT("info", ("trans_non_trans_access_engines: %d",
                        trans_non_trans_access_engines));
3805 3806 3807 3808

    int error= 0;
    int unsafe_flags;

3809 3810 3811 3812
    /*
      Set the statement as unsafe if:

      . it is a mixed statement, i.e. access transactional and non-transactional
3813 3814 3815 3816
      tables, and update any of them;

      or:

3817 3818 3819 3820 3821 3822 3823 3824 3825 3826 3827 3828 3829
      . an early statement updated a transactional table;
      . and, the current statement updates a non-transactional table.

      Any mixed statement is classified as unsafe to ensure that mixed mode is
      completely safe. Consider the following example to understand why we
      decided to do this:

      Note that mixed statements such as

      1: INSERT INTO myisam_t SELECT * FROM innodb_t;

      2: INSERT INTO innodb_t SELECT * FROM myisam_t;

3830 3831 3832 3833 3834 3835
      3: INSERT INTO myisam_t SELECT * FROM myisam_t_temp;

      4: INSERT INTO myisam_t_temp SELECT * FROM myisam_t;

      5: CREATE TEMPORARY TABLE myisam_t_temp SELECT * FROM mysiam_t;

3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 3846 3847 3848 3849 3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 3861 3862 3863 3864 3865 3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 3879 3880 3881 3882 3883 3884 3885
      are classified as unsafe to ensure that in mixed mode the execution is
      completely safe and equivalent to the row mode. Consider the following
      statements and sessions (connections) to understand the reason:

      con1: INSERT INTO innodb_t VALUES (1);
      con1: INSERT INTO innodb_t VALUES (100);

      con1: BEGIN
      con2: INSERT INTO myisam_t SELECT * FROM innodb_t;
      con1: INSERT INTO innodb_t VALUES (200);
      con1: COMMIT;

      The point is that the concurrent statements may be written into the binary log
      in a way different from the execution. For example,

      BINARY LOG:

      con2: BEGIN;
      con2: INSERT INTO myisam_t SELECT * FROM innodb_t;
      con2: COMMIT;
      con1: BEGIN
      con1: INSERT INTO innodb_t VALUES (200);
      con1: COMMIT;

      ....

      or

      BINARY LOG:

      con1: BEGIN
      con1: INSERT INTO innodb_t VALUES (200);
      con1: COMMIT;
      con2: BEGIN;
      con2: INSERT INTO myisam_t SELECT * FROM innodb_t;
      con2: COMMIT;

      Clearly, this may become a problem in STMT mode and setting the statement
      as unsafe will make rows to be written into the binary log in MIXED mode
      and as such the problem will not stand.

      In STMT mode, although such statement is classified as unsafe, i.e.

      INSERT INTO myisam_t SELECT * FROM innodb_t;

      there is no enough information to avoid writing it outside the boundaries
      of a transaction. This is not a problem if we are considering snapshot
      isolation level but if we have pure repeatable read or serializable the
      lock history on the slave will be different from the master.
    */
3886
    if (trans_non_trans_access_engines)
3887 3888
      lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_MIXED_STATEMENT);
    else if (trans_has_updated_trans_table(this) && !all_trans_write_engines)
3889 3890
      lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_NONTRANS_AFTER_TRANS);

Sven Sandberg's avatar
Sven Sandberg committed
3891 3892 3893 3894 3895 3896
    /*
      If more than one engine is involved in the statement and at
      least one is doing it's own logging (is *self-logging*), the
      statement cannot be logged atomically, so we generate an error
      rather than allowing the binlog to become corrupt.
    */
3897 3898
    if (multi_write_engine &&
        (flags_write_some_set & HA_HAS_OWN_BINLOGGING))
Sven Sandberg's avatar
Sven Sandberg committed
3899 3900
      my_error((error= ER_BINLOG_MULTIPLE_ENGINES_AND_SELF_LOGGING_ENGINE),
               MYF(0));
3901
    else if (multi_access_engine && flags_some_set & HA_HAS_OWN_BINLOGGING)
3902
      lex->set_stmt_unsafe(LEX::BINLOG_STMT_UNSAFE_MULTIPLE_ENGINES_AND_SELF_LOGGING_ENGINE);
Sven Sandberg's avatar
Sven Sandberg committed
3903 3904

    /* both statement-only and row-only engines involved */
3905
    if ((flags_write_all_set & (HA_BINLOG_STMT_CAPABLE | HA_BINLOG_ROW_CAPABLE)) == 0)
Sven Sandberg's avatar
Sven Sandberg committed
3906 3907 3908 3909 3910 3911 3912 3913
    {
      /*
        1. Error: Binary logging impossible since both row-incapable
           engines and statement-incapable engines are involved
      */
      my_error((error= ER_BINLOG_ROW_ENGINE_AND_STMT_ENGINE), MYF(0));
    }
    /* statement-only engines involved */
3914
    else if ((flags_write_all_set & HA_BINLOG_ROW_CAPABLE) == 0)
Sven Sandberg's avatar
Sven Sandberg committed
3915 3916 3917 3918 3919 3920 3921 3922 3923 3924 3925 3926 3927 3928 3929 3930 3931 3932 3933 3934
    {
      if (lex->is_stmt_row_injection())
      {
        /*
          4. Error: Cannot execute row injection since table uses
             storage engine limited to statement-logging
        */
        my_error((error= ER_BINLOG_ROW_INJECTION_AND_STMT_ENGINE), MYF(0));
      }
      else if (variables.binlog_format == BINLOG_FORMAT_ROW)
      {
        /*
          2. Error: Cannot modify table that uses a storage engine
             limited to statement-logging when BINLOG_FORMAT = ROW
        */
        my_error((error= ER_BINLOG_ROW_MODE_AND_STMT_ENGINE), MYF(0));
      }
      else if ((unsafe_flags= lex->get_stmt_unsafe_flags()) != 0)
      {
        /*
3935 3936 3937
          3. Error: Cannot execute statement: binlogging of unsafe
             statement is impossible when storage engine is limited to
             statement-logging and BINLOG_FORMAT = MIXED.
Sven Sandberg's avatar
Sven Sandberg committed
3938
        */
3939 3940 3941 3942 3943 3944
        for (int unsafe_type= 0;
             unsafe_type < LEX::BINLOG_STMT_UNSAFE_COUNT;
             unsafe_type++)
          if (unsafe_flags & (1 << unsafe_type))
            my_error((error= ER_BINLOG_UNSAFE_AND_STMT_ENGINE), MYF(0),
                     ER(LEX::binlog_stmt_unsafe_errcode[unsafe_type]));
Sven Sandberg's avatar
Sven Sandberg committed
3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 3956 3957 3958 3959 3960 3961
      }
      /* log in statement format! */
    }
    /* no statement-only engines */
    else
    {
      /* binlog_format = STATEMENT */
      if (variables.binlog_format == BINLOG_FORMAT_STMT)
      {
        if (lex->is_stmt_row_injection())
        {
          /*
            6. Error: Cannot execute row injection since
               BINLOG_FORMAT = STATEMENT
          */
          my_error((error= ER_BINLOG_ROW_INJECTION_AND_STMT_MODE), MYF(0));
        }
3962
        else if ((flags_write_all_set & HA_BINLOG_STMT_CAPABLE) == 0)
Sven Sandberg's avatar
Sven Sandberg committed
3963 3964 3965 3966 3967 3968 3969 3970 3971 3972 3973 3974 3975
        {
          /*
            5. Error: Cannot modify table that uses a storage engine
               limited to row-logging when binlog_format = STATEMENT
          */
          my_error((error= ER_BINLOG_STMT_MODE_AND_ROW_ENGINE), MYF(0), "");
        }
        else if ((unsafe_flags= lex->get_stmt_unsafe_flags()) != 0)
        {
          /*
            7. Warning: Unsafe statement logged as statement due to
               binlog_format = STATEMENT
          */
3976
          binlog_unsafe_warning_flags|= unsafe_flags;
Sven Sandberg's avatar
Sven Sandberg committed
3977 3978 3979
          DBUG_PRINT("info", ("Scheduling warning to be issued by "
                              "binlog_query: '%s'",
                              ER(ER_BINLOG_UNSAFE_STATEMENT)));
3980
          DBUG_PRINT("info", ("binlog_unsafe_warning_flags: 0x%x",
Sven Sandberg's avatar
Sven Sandberg committed
3981 3982 3983 3984 3985 3986 3987 3988 3989
                              binlog_unsafe_warning_flags));
        }
        /* log in statement format! */
      }
      /* No statement-only engines and binlog_format != STATEMENT.
         I.e., nothing prevents us from row logging if needed. */
      else
      {
        if (lex->is_stmt_unsafe() || lex->is_stmt_row_injection()
3990
            || (flags_write_all_set & HA_BINLOG_STMT_CAPABLE) == 0)
Sven Sandberg's avatar
Sven Sandberg committed
3991 3992
        {
          /* log in row format! */
3993
          set_current_stmt_binlog_format_row_if_mixed();
Sven Sandberg's avatar
Sven Sandberg committed
3994 3995 3996 3997 3998 3999 4000 4001 4002 4003 4004 4005 4006 4007 4008 4009
        }
      }
    }

    if (error) {
      DBUG_PRINT("info", ("decision: no logging since an error was generated"));
      DBUG_RETURN(-1);
    }
    DBUG_PRINT("info", ("decision: logging in %s format",
                        is_current_stmt_binlog_format_row() ?
                        "ROW" : "STATEMENT"));
  }
#ifndef DBUG_OFF
  else
    DBUG_PRINT("info", ("decision: no logging since "
                        "mysql_bin_log.is_open() = %d "
4010
                        "and (options & OPTION_BIN_LOG) = 0x%llx "
4011
                        "and binlog_format = %u "
4012 4013
                        "and binlog_filter->db_ok(db) = %d",
                        mysql_bin_log.is_open(),
unknown's avatar
unknown committed
4014
                        (variables.option_bits & OPTION_BIN_LOG),
4015 4016
                        variables.binlog_format,
                        binlog_filter->db_ok(db)));
Sven Sandberg's avatar
Sven Sandberg committed
4017 4018 4019 4020 4021 4022
#endif

  DBUG_RETURN(0);
}


4023 4024 4025 4026 4027 4028 4029 4030 4031 4032 4033 4034 4035 4036 4037 4038 4039 4040 4041 4042 4043 4044 4045 4046 4047 4048 4049 4050 4051 4052 4053 4054
/*
  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,
4055 4056
                                       size_t colcnt,
                                       size_t needed,
unknown's avatar
unknown committed
4057 4058
                                       bool is_transactional,
				       RowsEventT *hint __attribute__((unused)))
4059
{
4060
  DBUG_ENTER("binlog_prepare_pending_rows_event");
4061
  /* Pre-conditions */
4062
  DBUG_ASSERT(table->s->table_map_id != ~0UL);
4063 4064 4065 4066 4067 4068 4069 4070 4071

  /* 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())
4072
    DBUG_RETURN(NULL);
4073

4074
  Rows_log_event* pending= binlog_get_pending_rows_event(is_transactional);
4075 4076

  if (unlikely(pending && !pending->is_valid()))
4077
    DBUG_RETURN(NULL);
4078 4079 4080 4081 4082 4083 4084 4085 4086 4087 4088 4089 4090 4091 4092 4093 4094 4095 4096 4097 4098 4099 4100 4101

  /*
    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))
4102
      DBUG_RETURN(NULL);
4103 4104 4105 4106 4107
    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...
    */
4108 4109 4110
    if (unlikely(
        mysql_bin_log.flush_and_set_pending_rows_event(this, ev,
                                                       is_transactional)))
4111 4112
    {
      delete ev;
4113
      DBUG_RETURN(NULL);
4114 4115
    }

4116
    DBUG_RETURN(ev);               /* This is the new pending event */
4117
  }
4118
  DBUG_RETURN(pending);        /* This is the current pending event */
4119 4120
}

unknown's avatar
unknown committed
4121
#ifdef HAVE_EXPLICIT_TEMPLATE_INSTANTIATION
4122
/*
4123
  Instantiate the versions we need, we have -fno-implicit-template as
4124 4125 4126
  compiling option.
*/
template Rows_log_event*
unknown's avatar
unknown committed
4127
THD::binlog_prepare_pending_rows_event(TABLE*, uint32, MY_BITMAP const*,
4128
				       size_t, size_t, bool,
unknown's avatar
unknown committed
4129
				       Write_rows_log_event*);
4130 4131

template Rows_log_event*
unknown's avatar
unknown committed
4132
THD::binlog_prepare_pending_rows_event(TABLE*, uint32, MY_BITMAP const*,
4133
				       size_t colcnt, size_t, bool,
unknown's avatar
unknown committed
4134
				       Delete_rows_log_event *);
4135 4136

template Rows_log_event* 
unknown's avatar
unknown committed
4137
THD::binlog_prepare_pending_rows_event(TABLE*, uint32, MY_BITMAP const*,
4138
				       size_t colcnt, size_t, bool,
unknown's avatar
unknown committed
4139
				       Update_rows_log_event *);
unknown's avatar
unknown committed
4140
#endif
unknown's avatar
unknown committed
4141 4142

#ifdef NOT_USED
4143 4144 4145
static char const* 
field_type_name(enum_field_types type) 
{
unknown's avatar
unknown committed
4146
  switch (type) {
4147 4148 4149 4150 4151 4152 4153 4154 4155 4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 4171 4172 4173 4174 4175 4176 4177 4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 4194 4195 4196 4197 4198 4199 4200 4201 4202 4203
  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";
}
unknown's avatar
unknown committed
4204
#endif
4205

4206

4207 4208 4209 4210 4211 4212 4213 4214 4215 4216 4217 4218 4219 4220 4221 4222 4223 4224 4225 4226 4227 4228 4229 4230 4231 4232 4233 4234
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.
     */
4235
    Row_data_memory(TABLE *table, size_t const len1)
4236 4237 4238
      : m_memory(0)
    {
#ifndef DBUG_OFF
4239
      m_alloc_checked= FALSE;
4240 4241 4242 4243 4244 4245
#endif
      allocate_memory(table, len1);
      m_ptr[0]= has_memory() ? m_memory : 0;
      m_ptr[1]= 0;
    }

4246
    Row_data_memory(TABLE *table, size_t const len1, size_t const len2)
4247 4248 4249
      : m_memory(0)
    {
#ifndef DBUG_OFF
4250
      m_alloc_checked= FALSE;
4251 4252 4253 4254 4255 4256 4257 4258 4259
#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)
4260
        my_free((uchar*) m_memory, MYF(MY_WME));
4261 4262 4263 4264 4265 4266 4267 4268 4269 4270
    }

    /**
       Is there memory allocated?

       @retval true There is memory allocated
       @retval false Memory allocation failed
     */
    bool has_memory() const {
#ifndef DBUG_OFF
4271
      m_alloc_checked= TRUE;
4272 4273 4274 4275
#endif
      return m_memory != 0;
    }

4276
    uchar *slot(uint s)
4277
    {
unknown's avatar
unknown committed
4278
      DBUG_ASSERT(s < sizeof(m_ptr)/sizeof(*m_ptr));
4279
      DBUG_ASSERT(m_ptr[s] != 0);
4280
      DBUG_ASSERT(m_alloc_checked == TRUE);
4281 4282 4283 4284
      return m_ptr[s];
    }

  private:
4285
    void allocate_memory(TABLE *const table, size_t const total_length)
4286 4287 4288 4289 4290 4291 4292 4293 4294 4295 4296 4297 4298
    {
      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.
        */
4299
        size_t const maxlen= table->s->reclength + 2 * table->s->fields;
4300 4301 4302 4303 4304 4305 4306 4307

        /*
          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=
4308
            (uchar *) alloc_root(&table->mem_root, 2 * maxlen);
4309
        m_memory= table->write_row_record;
4310
        m_release_memory_on_destruction= FALSE;
4311 4312 4313
      }
      else
      {
4314
        m_memory= (uchar *) my_malloc(total_length, MYF(MY_WME));
4315
        m_release_memory_on_destruction= TRUE;
4316 4317 4318 4319 4320 4321 4322
      }
    }

#ifndef DBUG_OFF
    mutable bool m_alloc_checked;
#endif
    bool m_release_memory_on_destruction;
4323 4324
    uchar *m_memory;
    uchar *m_ptr[2];
4325 4326 4327 4328
  };
}


4329
int THD::binlog_write_row(TABLE* table, bool is_trans, 
4330 4331
                          MY_BITMAP const* cols, size_t colcnt, 
                          uchar const *record) 
4332
{ 
4333
  DBUG_ASSERT(is_current_stmt_binlog_format_row() && mysql_bin_log.is_open());
4334

4335 4336 4337
  /*
    Pack records into format for transfer. We are allocating more
    memory than needed, but that doesn't matter.
4338
  */
4339 4340 4341
  Row_data_memory memory(table, max_row_length(table, record));
  if (!memory.has_memory())
    return HA_ERR_OUT_OF_MEM;
4342

4343
  uchar *row_data= memory.slot(0);
4344

4345
  size_t const len= pack_row(table, cols, row_data, record);
4346

4347 4348 4349 4350 4351 4352 4353 4354 4355
  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);
4356 4357 4358
}

int THD::binlog_update_row(TABLE* table, bool is_trans,
4359 4360 4361
                           MY_BITMAP const* cols, size_t colcnt,
                           const uchar *before_record,
                           const uchar *after_record)
4362
{ 
4363
  DBUG_ASSERT(is_current_stmt_binlog_format_row() && mysql_bin_log.is_open());
4364

4365 4366
  size_t const before_maxlen = max_row_length(table, before_record);
  size_t const after_maxlen  = max_row_length(table, after_record);
4367

4368 4369 4370 4371
  Row_data_memory row_data(table, before_maxlen, after_maxlen);
  if (!row_data.has_memory())
    return HA_ERR_OUT_OF_MEM;

4372 4373
  uchar *before_row= row_data.slot(0);
  uchar *after_row= row_data.slot(1);
4374

4375
  size_t const before_size= pack_row(table, cols, before_row,
4376
                                        before_record);
4377
  size_t const after_size= pack_row(table, cols, after_row,
4378
                                       after_record);
4379 4380 4381 4382 4383 4384

  /*
    Don't print debug messages when running valgrind since they can
    trigger false warnings.
   */
#ifndef HAVE_purify
4385 4386 4387 4388
  DBUG_DUMP("before_record", before_record, table->s->reclength);
  DBUG_DUMP("after_record",  after_record, table->s->reclength);
  DBUG_DUMP("before_row",    before_row, before_size);
  DBUG_DUMP("after_row",     after_row, after_size);
4389
#endif
4390

unknown's avatar
unknown committed
4391 4392 4393 4394
  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));
4395

4396 4397 4398 4399
  if (unlikely(ev == 0))
    return HA_ERR_OUT_OF_MEM;

  return
4400
    ev->add_row_data(before_row, before_size) ||
4401 4402 4403 4404
    ev->add_row_data(after_row, after_size);
}

int THD::binlog_delete_row(TABLE* table, bool is_trans, 
4405 4406
                           MY_BITMAP const* cols, size_t colcnt,
                           uchar const *record)
4407
{ 
4408
  DBUG_ASSERT(is_current_stmt_binlog_format_row() && mysql_bin_log.is_open());
4409 4410 4411 4412 4413

  /* 
     Pack records into format for transfer. We are allocating more
     memory than needed, but that doesn't matter.
  */
4414 4415
  Row_data_memory memory(table, max_row_length(table, record));
  if (unlikely(!memory.has_memory()))
4416
    return HA_ERR_OUT_OF_MEM;
4417

4418
  uchar *row_data= memory.slot(0);
4419

4420
  size_t const len= pack_row(table, cols, row_data, record);
4421

unknown's avatar
unknown committed
4422 4423 4424 4425
  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));
4426

4427 4428
  if (unlikely(ev == 0))
    return HA_ERR_OUT_OF_MEM;
4429

4430
  return ev->add_row_data(row_data, len);
4431 4432 4433
}


4434 4435
int THD::binlog_remove_pending_rows_event(bool clear_maps,
                                          bool is_transactional)
4436
{
4437
  DBUG_ENTER("THD::binlog_remove_pending_rows_event");
4438 4439 4440 4441

  if (!mysql_bin_log.is_open())
    DBUG_RETURN(0);

4442
  mysql_bin_log.remove_pending_rows_event(this, is_transactional);
4443 4444 4445 4446 4447 4448 4449

  if (clear_maps)
    binlog_table_maps= 0;

  DBUG_RETURN(0);
}

4450
int THD::binlog_flush_pending_rows_event(bool stmt_end, bool is_transactional)
4451 4452
{
  DBUG_ENTER("THD::binlog_flush_pending_rows_event");
4453 4454 4455 4456 4457 4458
  /*
    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())
4459 4460 4461 4462 4463 4464 4465
    DBUG_RETURN(0);

  /*
    Mark the event as the last event of a statement if the stmt_end
    flag is set.
  */
  int error= 0;
4466
  if (Rows_log_event *pending= binlog_get_pending_rows_event(is_transactional))
4467 4468 4469 4470
  {
    if (stmt_end)
    {
      pending->set_flags(Rows_log_event::STMT_END_F);
4471
      binlog_table_maps= 0;
4472 4473
    }

4474 4475
    error= mysql_bin_log.flush_and_set_pending_rows_event(this, 0,
                                                          is_transactional);
4476
  }
4477 4478 4479 4480 4481

  DBUG_RETURN(error);
}


4482
#if !defined(DBUG_OFF) && !defined(_lint)
4483 4484 4485 4486 4487 4488 4489 4490
static const char *
show_query_type(THD::enum_binlog_query_type qtype)
{
  switch (qtype) {
  case THD::ROW_QUERY_TYPE:
    return "ROW";
  case THD::STMT_QUERY_TYPE:
    return "STMT";
4491
  case THD::QUERY_TYPE_COUNT:
4492
  default:
4493
    DBUG_ASSERT(0 <= qtype && qtype < THD::QUERY_TYPE_COUNT);
4494
  }
4495 4496 4497
  static char buf[64];
  sprintf(buf, "UNKNOWN#%d", qtype);
  return buf;
4498
}
4499
#endif
4500 4501


4502 4503
/**
  Auxiliary method used by @c binlog_query() to raise warnings.
4504

4505 4506
  The type of warning and the type of unsafeness is stored in
  THD::binlog_unsafe_warning_flags.
4507 4508 4509 4510 4511 4512 4513 4514
*/
void THD::issue_unsafe_warnings()
{
  DBUG_ENTER("issue_unsafe_warnings");
  /*
    Ensure that binlog_unsafe_warning_flags is big enough to hold all
    bits.  This is actually a constant expression.
  */
4515
  DBUG_ASSERT(2 * LEX::BINLOG_STMT_UNSAFE_COUNT <=
4516
              sizeof(binlog_unsafe_warning_flags) * CHAR_BIT);
4517

4518
  uint32 unsafe_type_flags= binlog_unsafe_warning_flags;
4519

4520
  /*
4521
    Clear: (1) bits above BINLOG_STMT_UNSAFE_COUNT; (2) bits for
4522 4523 4524 4525 4526 4527 4528
    warnings that have been printed already.
  */
  unsafe_type_flags &= (LEX::BINLOG_STMT_UNSAFE_ALL_FLAGS ^
                        (unsafe_type_flags >> LEX::BINLOG_STMT_UNSAFE_COUNT));
  /* If all warnings have been printed already, return. */
  if (unsafe_type_flags == 0)
    DBUG_VOID_RETURN;
4529

4530
  DBUG_PRINT("info", ("unsafe_type_flags: 0x%x", unsafe_type_flags));
4531

4532 4533 4534 4535 4536 4537 4538 4539 4540 4541
  /*
    For each unsafe_type, check if the statement is unsafe in this way
    and issue a warning.
  */
  for (int unsafe_type=0;
       unsafe_type < LEX::BINLOG_STMT_UNSAFE_COUNT;
       unsafe_type++)
  {
    if ((unsafe_type_flags & (1 << unsafe_type)) != 0)
    {
4542 4543 4544 4545
      push_warning_printf(this, MYSQL_ERROR::WARN_LEVEL_NOTE,
                          ER_BINLOG_UNSAFE_STATEMENT,
                          ER(ER_BINLOG_UNSAFE_STATEMENT),
                          ER(LEX::binlog_stmt_unsafe_errcode[unsafe_type]));
4546
      if (global_system_variables.log_warnings)
4547 4548 4549 4550
      {
        char buf[MYSQL_ERRMSG_SIZE * 2];
        sprintf(buf, ER(ER_BINLOG_UNSAFE_STATEMENT),
                ER(LEX::binlog_stmt_unsafe_errcode[unsafe_type]));
4551
        sql_print_warning(ER(ER_MESSAGE_AND_STATEMENT), buf, query());
4552
      }
4553 4554 4555 4556 4557 4558
    }
  }
  /*
    Mark these unsafe types as already printed, to avoid printing
    warnings for them again.
  */
4559 4560
  binlog_unsafe_warning_flags|=
    unsafe_type_flags << LEX::BINLOG_STMT_UNSAFE_COUNT;
4561 4562 4563 4564
  DBUG_VOID_RETURN;
}


4565 4566
/**
  Log the current query.
4567

4568
  The query will be logged in either row format or statement format
4569
  depending on the value of @c current_stmt_binlog_format_row field and
4570
  the value of the @c qtype parameter.
4571

4572
  This function must be called:
4573

4574
  - After the all calls to ha_*_row() functions have been issued.
4575

4576 4577 4578 4579 4580 4581 4582 4583 4584 4585 4586 4587 4588
  - After any writes to system tables. Rationale: if system tables
    were written after a call to this function, and the master crashes
    after the call to this function and before writing the system
    tables, then the master and slave get out of sync.

  - Before tables are unlocked and closed.

  @see decide_logging_format

  @retval 0 Success

  @retval nonzero If there is a failure when writing the query (e.g.,
  write failure), then the error code is returned.
4589
*/
4590
int THD::binlog_query(THD::enum_binlog_query_type qtype, char const *query_arg,
4591 4592
                      ulong query_len, bool is_trans, bool direct, 
                      bool suppress_use, int errcode)
4593 4594
{
  DBUG_ENTER("THD::binlog_query");
4595 4596
  DBUG_PRINT("enter", ("qtype: %s  query: '%s'",
                       show_query_type(qtype), query_arg));
4597
  DBUG_ASSERT(query_arg && mysql_bin_log.is_open());
4598

4599 4600 4601 4602 4603 4604 4605 4606 4607
  /*
    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().
  */
Konstantin Osipov's avatar
Konstantin Osipov committed
4608
  if (this->locked_tables_mode <= LTM_LOCK_TABLES)
4609
    if (int error= binlog_flush_pending_rows_event(TRUE, is_trans))
4610 4611
      DBUG_RETURN(error);

4612
  /*
4613 4614 4615 4616 4617
    Warnings for unsafe statements logged in statement format are
    printed here instead of in decide_logging_format().  This is
    because the warnings should be printed only if the statement is
    actually logged. When executing decide_logging_format(), we cannot
    know for sure if the statement will be logged.
4618
  */
4619
  if (sql_log_bin_toplevel)
4620
    issue_unsafe_warnings();
4621

4622
  switch (qtype) {
4623 4624 4625
    /*
      ROW_QUERY_TYPE means that the statement may be logged either in
      row format or in statement format.  If
4626
      current_stmt_binlog_format is row, it means that the
4627 4628 4629
      statement has already been logged in row format and hence shall
      not be logged again.
    */
4630
  case THD::ROW_QUERY_TYPE:
4631
    DBUG_PRINT("debug",
4632
               ("is_current_stmt_binlog_format_row: %d",
4633 4634
                is_current_stmt_binlog_format_row()));
    if (is_current_stmt_binlog_format_row())
4635
      DBUG_RETURN(0);
4636
    /* Fall through */
4637

4638 4639 4640 4641
    /*
      STMT_QUERY_TYPE means that the query must be logged in statement
      format; it cannot be logged in row format.  This is typically
      used by DDL statements.  It is an error to use this query type
4642
      if current_stmt_binlog_format_row is row.
4643 4644

      @todo Currently there are places that call this method with
4645
      STMT_QUERY_TYPE and current_stmt_binlog_format is row.  Fix those
4646
      places and add assert to ensure correct behavior. /Sven
4647 4648 4649
    */
  case THD::STMT_QUERY_TYPE:
    /*
4650 4651
      The MYSQL_LOG::write() function will set the STMT_END_F flag and
      flush the pending rows event if necessary.
4652
    */
4653
    {
4654 4655
      Query_log_event qinfo(this, query_arg, query_len, is_trans, direct,
                            suppress_use, errcode);
4656 4657 4658 4659 4660 4661 4662 4663 4664
      /*
        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);
4665 4666 4667 4668 4669 4670 4671 4672 4673 4674
    }
    break;

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

4675 4676 4677 4678 4679 4680 4681 4682 4683
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);
4684
    DBUG_RETURN(append(new_interval));
4685 4686 4687 4688
  }
  DBUG_RETURN(0);
}

4689 4690 4691 4692 4693 4694 4695 4696 4697 4698 4699 4700 4701 4702 4703
bool Discrete_intervals_list::append(Discrete_interval *new_interval)
{
  DBUG_ENTER("Discrete_intervals_list::append");
  if (unlikely(new_interval == NULL))
    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);
}

4704
#endif /* !defined(MYSQL_CLIENT) */