sql_base.cc 67.3 KB
Newer Older
unknown's avatar
unknown committed
1
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
2

unknown's avatar
unknown committed
3 4 5 6
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
7

unknown's avatar
unknown committed
8 9 10 11
   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.
12

unknown's avatar
unknown committed
13 14 15 16 17
   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 */


18
/* Basic functions needed by many modules */
unknown's avatar
unknown committed
19 20 21

#include "mysql_priv.h"
#include "sql_acl.h"
22
#include "sql_select.h"
unknown's avatar
unknown committed
23 24 25 26 27 28 29 30 31 32
#include <m_ctype.h>
#include <my_dir.h>
#include <hash.h>
#include <nisam.h>
#ifdef	__WIN__
#include <io.h>
#endif

TABLE *unused_tables;				/* Used by mysql_test */
HASH open_cache;				/* Used by mysql_test */
unknown's avatar
unknown committed
33
HASH assign_cache;
unknown's avatar
unknown committed
34

35
static int open_unireg_entry(THD *thd,TABLE *entry,const char *db,
unknown's avatar
unknown committed
36
			     const char *name, const char *alias);
unknown's avatar
unknown committed
37 38 39 40
static void free_cache_entry(TABLE *entry);
static void mysql_rm_tmp_tables(void);


41 42
extern "C" byte *table_cache_key(const byte *record,uint *length,
				 my_bool not_used __attribute__((unused)))
unknown's avatar
unknown committed
43 44 45 46 47 48 49 50
{
  TABLE *entry=(TABLE*) record;
  *length=entry->key_length;
  return (byte*) entry->table_cache_key;
}

void table_cache_init(void)
{
unknown's avatar
unknown committed
51
  VOID(hash_init(&open_cache,&my_charset_bin,
unknown's avatar
unknown committed
52
		 table_cache_size+16,0,0,table_cache_key,
53
		 (hash_free_key) free_cache_entry,0));
unknown's avatar
unknown committed
54 55 56 57 58 59
  mysql_rm_tmp_tables();
}

void table_cache_free(void)
{
  DBUG_ENTER("table_cache_free");
unknown's avatar
unknown committed
60
  close_cached_tables((THD*) 0,0,(TABLE_LIST*) 0);
unknown's avatar
unknown committed
61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100
  if (!open_cache.records)			// Safety first
    hash_free(&open_cache);
  DBUG_VOID_RETURN;
}

uint cached_tables(void)
{
  return open_cache.records;
}

#ifdef EXTRA_DEBUG
static void check_unused(void)
{
  uint count=0,idx=0;
  TABLE *cur_link,*start_link;

  if ((start_link=cur_link=unused_tables))
  {
    do
    {
      if (cur_link != cur_link->next->prev || cur_link != cur_link->prev->next)
      {
	DBUG_PRINT("error",("Unused_links aren't linked properly")); /* purecov: inspected */
	return; /* purecov: inspected */
      }
    } while (count++ < open_cache.records &&
	     (cur_link=cur_link->next) != start_link);
    if (cur_link != start_link)
    {
      DBUG_PRINT("error",("Unused_links aren't connected")); /* purecov: inspected */
    }
  }
  for (idx=0 ; idx < open_cache.records ; idx++)
  {
    TABLE *entry=(TABLE*) hash_element(&open_cache,idx);
    if (!entry->in_use)
      count--;
  }
  if (count != 0)
  {
101
    DBUG_PRINT("error",("Unused_links doesn't match open_cache: diff: %d", /* purecov: inspected */
unknown's avatar
unknown committed
102 103 104 105 106 107 108
			count)); /* purecov: inspected */
  }
}
#else
#define check_unused()
#endif

unknown's avatar
unknown committed
109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126
/*
  Create a list for all open tables matching SQL expression

  SYNOPSIS
    list_open_tables()
    thd			Thread THD
    wild		SQL like expression

  NOTES
    One gets only a list of tables for which one has any kind of privilege.
    db and table names are allocated in result struct, so one doesn't need
    a lock on LOCK_open when traversing the return list.

  RETURN VALUES
    NULL	Error (Probably OOM)
    #		Pointer to list of names of open tables.
*/

127
OPEN_TABLE_LIST *list_open_tables(THD *thd, const char *wild)
128 129
{
  int result = 0;
130
  OPEN_TABLE_LIST **start_list, *open_list;
131
  TABLE_LIST table_list;
132
  char name[NAME_LEN*2];
133
  DBUG_ENTER("list_open_tables");
134

135 136
  VOID(pthread_mutex_lock(&LOCK_open));
  bzero((char*) &table_list,sizeof(table_list));
137 138
  start_list= &open_list;
  open_list=0;
139

140
  for (uint idx=0 ; result == 0 && idx < open_cache.records; idx++)
141
  {
142
    OPEN_TABLE_LIST *table;
143
    TABLE *entry=(TABLE*) hash_element(&open_cache,idx);
144

145 146
    DBUG_ASSERT(entry->real_name);
    if ((!entry->real_name))			// To be removed
147 148
      continue;					// Shouldn't happen
    if (wild)
149
    {
150
      strxmov(name,entry->table_cache_key,".",entry->real_name,NullS);
151
      if (wild_compare(name,wild,0))
152
	continue;
153 154
    }

155 156 157 158
    /* Check if user has SELECT privilege for any column in the table */
    table_list.db= (char*) entry->table_cache_key;
    table_list.real_name= entry->real_name;
    table_list.grant.privilege=0;
unknown's avatar
unknown committed
159
    if (check_table_access(thd,SELECT_ACL | EXTRA_ACL,&table_list,1))
160 161 162
      continue;
    /* need to check if we haven't already listed it */
    for (table= open_list  ; table ; table=table->next)
163
    {
164 165 166 167 168 169 170 171 172
      if (!strcmp(table->table,entry->real_name) &&
	  !strcmp(table->db,entry->table_cache_key))
      {
	if (entry->in_use)
	  table->in_use++;
	if (entry->locked_by_name)
	  table->locked++;
	break;
      }
173
    }
174
    if (table)
175
      continue;
176
    if (!(*start_list = (OPEN_TABLE_LIST *)
177
	  sql_alloc(sizeof(**start_list)+entry->key_length)))
178
    {
179
      open_list=0;				// Out of memory
180
      break;
181
    }
182 183 184 185
    strmov((*start_list)->table=
	   strmov(((*start_list)->db= (char*) ((*start_list)+1)),
		  entry->table_cache_key)+1,
	   entry->real_name);
186 187 188
    (*start_list)->in_use= entry->in_use ? 1 : 0;
    (*start_list)->locked= entry->locked_by_name ? 1 : 0;
    start_list= &(*start_list)->next;
189
    *start_list=0;
190 191
  }
  VOID(pthread_mutex_unlock(&LOCK_open));
192
  DBUG_RETURN(open_list);
193
}
unknown's avatar
unknown committed
194 195 196 197 198 199 200 201 202 203 204 205 206

/*****************************************************************************
 *	 Functions to free open table cache
 ****************************************************************************/


void intern_close_table(TABLE *table)
{						// Free all structures
  free_io_cache(table);
  if (table->file)
    VOID(closefrm(table));			// close file
}

207 208 209 210 211 212 213 214 215 216
/*
  Remove table from the open table cache

  SYNOPSIS
    free_cache_entry()
    table		Table to remove

  NOTE
    We need to have a lock on LOCK_open when calling this
*/
unknown's avatar
unknown committed
217 218 219 220

static void free_cache_entry(TABLE *table)
{
  DBUG_ENTER("free_cache_entry");
221
  safe_mutex_assert_owner(&LOCK_open);
unknown's avatar
unknown committed
222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239

  intern_close_table(table);
  if (!table->in_use)
  {
    table->next->prev=table->prev;		/* remove from used chain */
    table->prev->next=table->next;
    if (table == unused_tables)
    {
      unused_tables=unused_tables->next;
      if (table == unused_tables)
	unused_tables=0;
    }
    check_unused();				// consisty check
  }
  my_free((gptr) table,MYF(0));
  DBUG_VOID_RETURN;
}

240
/* Free resources allocated by filesort() and read_record() */
unknown's avatar
unknown committed
241 242 243

void free_io_cache(TABLE *table)
{
244
  DBUG_ENTER("free_io_cache");
unknown's avatar
unknown committed
245
  if (table->sort.io_cache)
unknown's avatar
unknown committed
246
  {
unknown's avatar
unknown committed
247 248 249
    close_cached_file(table->sort.io_cache);
    my_free((gptr) table->sort.io_cache,MYF(0));
    table->sort.io_cache=0;
unknown's avatar
unknown committed
250
  }
251
  DBUG_VOID_RETURN;
unknown's avatar
unknown committed
252 253 254 255
}

	/* Close all tables which aren't in use by any thread */

unknown's avatar
unknown committed
256 257
bool close_cached_tables(THD *thd, bool if_wait_for_refresh,
			 TABLE_LIST *tables)
unknown's avatar
unknown committed
258 259 260 261 262
{
  bool result=0;
  DBUG_ENTER("close_cached_tables");

  VOID(pthread_mutex_lock(&LOCK_open));
unknown's avatar
unknown committed
263
  if (!tables)
unknown's avatar
unknown committed
264
  {
unknown's avatar
unknown committed
265 266
    while (unused_tables)
    {
unknown's avatar
unknown committed
267
#ifdef EXTRA_DEBUG
unknown's avatar
unknown committed
268 269
      if (hash_delete(&open_cache,(byte*) unused_tables))
	printf("Warning: Couldn't delete open table from hash\n");
unknown's avatar
unknown committed
270
#else
unknown's avatar
unknown committed
271
      VOID(hash_delete(&open_cache,(byte*) unused_tables));
unknown's avatar
unknown committed
272
#endif
unknown's avatar
unknown committed
273 274
    }
    refresh_version++;				// Force close of open tables
unknown's avatar
unknown committed
275
  }
unknown's avatar
unknown committed
276
  else
unknown's avatar
unknown committed
277
  {
unknown's avatar
unknown committed
278 279 280
    bool found=0;
    for (TABLE_LIST *table=tables ; table ; table=table->next)
    {
281
      if (remove_table_from_cache(thd, table->db, table->real_name, 1))
unknown's avatar
unknown committed
282 283 284 285
	found=1;
    }
    if (!found)
      if_wait_for_refresh=0;			// Nothing to wait for
unknown's avatar
unknown committed
286
  }
287 288
  if (!tables)
    kill_delayed_threads();
unknown's avatar
unknown committed
289 290 291 292 293 294 295 296 297 298
  if (if_wait_for_refresh)
  {
    /*
      If there is any table that has a lower refresh_version, wait until
      this is closed (or this thread is killed) before returning
    */
    thd->mysys_var->current_mutex= &LOCK_open;
    thd->mysys_var->current_cond= &COND_refresh;
    thd->proc_info="Flushing tables";

unknown's avatar
unknown committed
299
    close_old_data_files(thd,thd->open_tables,1,1);
unknown's avatar
unknown committed
300 301
    bool found=1;
    /* Wait until all threads has closed all the tables we had locked */
302 303
    DBUG_PRINT("info",
	       ("Waiting for others threads to close their open tables"));
unknown's avatar
unknown committed
304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325
    while (found && ! thd->killed)
    {
      found=0;
      for (uint idx=0 ; idx < open_cache.records ; idx++)
      {
	TABLE *table=(TABLE*) hash_element(&open_cache,idx);
	if ((table->version) < refresh_version && table->db_stat)
	{
	  found=1;
	  pthread_cond_wait(&COND_refresh,&LOCK_open);
	  break;
	}
      }
    }
    /*
      No other thread has the locked tables open; reopen them and get the
      old locks. This should always succeed (unless some external process
      has removed the tables)
    */
    thd->in_lock_tables=1;
    result=reopen_tables(thd,1,1);
    thd->in_lock_tables=0;
326 327 328
    /* Set version for table */
    for (TABLE *table=thd->open_tables; table ; table=table->next)
      table->version=refresh_version;
unknown's avatar
unknown committed
329 330 331 332 333 334 335 336 337 338 339 340 341 342 343
  }
  VOID(pthread_mutex_unlock(&LOCK_open));
  if (if_wait_for_refresh)
  {
    THD *thd=current_thd;
    pthread_mutex_lock(&thd->mysys_var->mutex);
    thd->mysys_var->current_mutex= 0;
    thd->mysys_var->current_cond= 0;
    thd->proc_info=0;
    pthread_mutex_unlock(&thd->mysys_var->mutex);
  }
  DBUG_RETURN(result);
}


344 345
/*
  Close all tables used by thread
unknown's avatar
unknown committed
346

347 348 349 350 351 352 353 354 355 356 357 358
  SYNOPSIS
    close_thread_tables()
    thd			Thread handler
    lock_in_use		Set to 1 (0 = default) if caller has a lock on
			LOCK_open
    skip_derived	Set to 1 (0 = default) if we should not free derived
			tables.

  IMPLEMENTATION
    Unlocks tables and frees derived tables.
    Put all normal tables used by thread in free list.
*/
unknown's avatar
unknown committed
359

360
void close_thread_tables(THD *thd, bool lock_in_use, bool skip_derived)
unknown's avatar
unknown committed
361 362 363
{
  DBUG_ENTER("close_thread_tables");

364 365 366 367 368 369 370 371 372 373 374 375 376 377
  if (thd->derived_tables && !skip_derived)
  {
    TABLE *table, *next;
    /*
      Close all derived tables generated from questions like
      SELECT * from (select * from t1))
    */
    for (table= thd->derived_tables ; table ; table= next)
    {
      next= table->next;
      free_tmp_table(thd, table);
    }
    thd->derived_tables= 0;
  }
unknown's avatar
unknown committed
378
  if (thd->locked_tables)
379 380
  {
    ha_commit_stmt(thd);			// If select statement
unknown's avatar
unknown committed
381
    DBUG_VOID_RETURN;				// LOCK TABLES in use
382
  }
unknown's avatar
unknown committed
383 384 385 386 387

  bool found_old_table=0;

  if (thd->lock)
  {
388 389
    mysql_unlock_tables(thd, thd->lock);
    thd->lock=0;
unknown's avatar
unknown committed
390 391
  }
  /* VOID(pthread_sigmask(SIG_SETMASK,&thd->block_signals,NULL)); */
392
  if (!lock_in_use)
unknown's avatar
unknown committed
393
    VOID(pthread_mutex_lock(&LOCK_open));
394
  safe_mutex_assert_owner(&LOCK_open);
unknown's avatar
unknown committed
395 396

  DBUG_PRINT("info", ("thd->open_tables=%p", thd->open_tables));
397

398 399
  while (thd->open_tables)
    found_old_table|=close_thread_table(thd, &thd->open_tables);
400
  thd->some_tables_deleted=0;
401

unknown's avatar
unknown committed
402
  /* Free tables to hold down open files */
403
  while (open_cache.records > table_cache_size && unused_tables)
unknown's avatar
unknown committed
404 405 406 407 408 409 410
    VOID(hash_delete(&open_cache,(byte*) unused_tables)); /* purecov: tested */
  check_unused();
  if (found_old_table)
  {
    /* Tell threads waiting for refresh that something has happened */
    VOID(pthread_cond_broadcast(&COND_refresh));
  }
411
  if (!lock_in_use)
unknown's avatar
unknown committed
412 413 414 415 416
    VOID(pthread_mutex_unlock(&LOCK_open));
  /*  VOID(pthread_sigmask(SIG_SETMASK,&thd->signals,NULL)); */
  DBUG_VOID_RETURN;
}

417 418 419 420 421 422
/* move one table to free list */

bool close_thread_table(THD *thd, TABLE **table_ptr)
{
  DBUG_ENTER("close_thread_table");

423 424 425
  bool found_old_table= 0;
  TABLE *table= *table_ptr;
  DBUG_ASSERT(table->key_read == 0);
426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459

  *table_ptr=table->next;
  if (table->version != refresh_version ||
      thd->version != refresh_version || !table->db_stat)
  {
    VOID(hash_delete(&open_cache,(byte*) table));
    found_old_table=1;
  }
  else
  {
    if (table->flush_version != flush_version)
    {
      table->flush_version=flush_version;
      table->file->extra(HA_EXTRA_FLUSH);
    }
    else
    {
      // Free memory and reset for next loop
      table->file->extra(HA_EXTRA_RESET);
    }
    table->in_use=0;
    if (unused_tables)
    {
      table->next=unused_tables;		/* Link in last */
      table->prev=unused_tables->prev;
      unused_tables->prev=table;
      table->prev->next=table;
    }
    else
      unused_tables=table->next=table->prev=table;
  }
  DBUG_RETURN(found_old_table);
}

unknown's avatar
unknown committed
460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479
	/* Close and delete temporary tables */

void close_temporary(TABLE *table,bool delete_table)
{
  DBUG_ENTER("close_temporary");
  char path[FN_REFLEN];
  db_type table_type=table->db_type;
  strmov(path,table->path);
  free_io_cache(table);
  closefrm(table);
  my_free((char*) table,MYF(0));
  if (delete_table)
    rm_temporary_table(table_type, path);
  DBUG_VOID_RETURN;
}


void close_temporary_tables(THD *thd)
{
  TABLE *table,*next;
480 481
  char *query, *end;
  uint query_buf_size; 
482
  bool found_user_tables = 0;
unknown's avatar
unknown committed
483

484 485 486
  if (!thd->temporary_tables)
    return;
  
487
  LINT_INIT(end);
488
  query_buf_size= 50;   // Enough for DROP ... TABLE
489

490
  for (table=thd->temporary_tables ; table ; table=table->next)
unknown's avatar
unknown committed
491
    query_buf_size+= table->key_length+1;
492

493
  if ((query = alloc_root(&thd->mem_root, query_buf_size)))
494
    end=strmov(query, "DROP /*!40005 TEMPORARY */ TABLE ");
495

unknown's avatar
unknown committed
496 497
  for (table=thd->temporary_tables ; table ; table=next)
  {
498 499 500
    if (query) // we might be out of memory, but this is not fatal
    {
      // skip temporary tables not created directly by the user
unknown's avatar
unknown committed
501
      if (table->real_name[0] != '#')
502
	found_user_tables = 1;
503 504 505 506 507 508
      /*
        Here we assume table_cache_key always starts
        with \0 terminated db name
      */
      end = strxmov(end,"`",table->table_cache_key,"`",
                    ".`",table->real_name,"`,", NullS);
509
    }
unknown's avatar
unknown committed
510 511 512
    next=table->next;
    close_temporary(table);
  }
513
  if (query && found_user_tables && mysql_bin_log.is_open())
514
  {
515
    /* The -1 is to remove last ',' */
unknown's avatar
unknown committed
516
    thd->clear_error();
517
    Query_log_event qinfo(thd, query, (ulong)(end-query)-1, 0);
518 519
    mysql_bin_log.write(&qinfo);
  }
unknown's avatar
unknown committed
520 521 522
  thd->temporary_tables=0;
}

523
/*
524
  Find first suitable table by alias in given list.
525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541

  SYNOPSIS
    find_table_in_list()
    table - pointer to table list
    db_name - data base name or 0 for any
    table_name - table name or 0 for any

  RETURN VALUES
    NULL	Table not found
    #		Pointer to found table.
*/

TABLE_LIST * find_table_in_list(TABLE_LIST *table,
				const char *db_name, const char *table_name)
{
  for (; table; table= table->next)
    if ((!db_name || !strcmp(table->db, db_name)) &&
542 543
	(!table_name || !my_strcasecmp(table_alias_charset,
				       table->alias, table_name)))
544 545 546
      break;
  return table;
}
unknown's avatar
unknown committed
547

548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572
/*
  Find real table in given list.

  SYNOPSIS
    find_table_in_list()
    table - pointer to table list
    db_name - data base name
    table_name - table name

  RETURN VALUES
    NULL	Table not found
    #		Pointer to found table.
*/

TABLE_LIST * find_real_table_in_list(TABLE_LIST *table,
				     const char *db_name,
				     const char *table_name)
{
  for (; table; table= table->next)
    if (!strcmp(table->db, db_name) &&
	!strcmp(table->real_name, table_name))
      break;
  return table;
}

unknown's avatar
unknown committed
573 574 575 576 577 578
TABLE **find_temporary_table(THD *thd, const char *db, const char *table_name)
{
  char	key[MAX_DBKEY_LENGTH];
  uint	key_length= (uint) (strmov(strmov(key,db)+1,table_name)-key)+1;
  TABLE *table,**prev;

unknown's avatar
unknown committed
579 580
  int4store(key+key_length,thd->server_id);
  key_length += 4;
unknown's avatar
unknown committed
581
  int4store(key+key_length,thd->variables.pseudo_thread_id);
582
  key_length += 4;
583

unknown's avatar
unknown committed
584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603
  prev= &thd->temporary_tables;
  for (table=thd->temporary_tables ; table ; table=table->next)
  {
    if (table->key_length == key_length &&
	!memcmp(table->table_cache_key,key,key_length))
      return prev;
    prev= &table->next;
  }
  return 0;					// Not a temporary table
}

bool close_temporary_table(THD *thd, const char *db, const char *table_name)
{
  TABLE *table,**prev;

  if (!(prev=find_temporary_table(thd,db,table_name)))
    return 1;
  table= *prev;
  *prev= table->next;
  close_temporary(table);
604
  if (thd->slave_thread)
605
    --slave_open_temp_tables;
unknown's avatar
unknown committed
606 607 608
  return 0;
}

unknown's avatar
unknown committed
609 610 611 612 613 614 615
/*
  Used by ALTER TABLE when the table is a temporary one. It changes something
  only if the ALTER contained a RENAME clause (otherwise, table_name is the old
  name).
  Prepares a table cache key, which is the concatenation of db, table_name and
  thd->slave_proxy_id, separated by '\0'.
*/
616
bool rename_temporary_table(THD* thd, TABLE *table, const char *db,
unknown's avatar
unknown committed
617 618 619 620
			    const char *table_name)
{
  char *key;
  if (!(key=(char*) alloc_root(&table->mem_root,
unknown's avatar
unknown committed
621
			       (uint) strlen(db)+
unknown's avatar
unknown committed
622
			       (uint) strlen(table_name)+6+4)))
unknown's avatar
unknown committed
623 624 625 626 627
    return 1;				/* purecov: inspected */
  table->key_length=(uint)
    (strmov((table->real_name=strmov(table->table_cache_key=key,
				     db)+1),
	    table_name) - table->table_cache_key)+1;
unknown's avatar
unknown committed
628 629
  int4store(key+table->key_length,thd->server_id);
  table->key_length += 4;
unknown's avatar
unknown committed
630
  int4store(key+table->key_length,thd->variables.pseudo_thread_id);
631
  table->key_length += 4;
unknown's avatar
unknown committed
632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688
  return 0;
}


	/* move table first in unused links */

static void relink_unused(TABLE *table)
{
  if (table != unused_tables)
  {
    table->prev->next=table->next;		/* Remove from unused list */
    table->next->prev=table->prev;
    table->next=unused_tables;			/* Link in unused tables */
    table->prev=unused_tables->prev;
    unused_tables->prev->next=table;
    unused_tables->prev=table;
    unused_tables=table;
    check_unused();
  }
}


/*
  Remove all instances of table from the current open list
  Free all locks on tables that are done with LOCK TABLES
 */

TABLE *unlink_open_table(THD *thd, TABLE *list, TABLE *find)
{
  char key[MAX_DBKEY_LENGTH];
  uint key_length=find->key_length;
  TABLE *start=list,**prev,*next;
  prev= &start;
  memcpy(key,find->table_cache_key,key_length);
  for (; list ; list=next)
  {
    next=list->next;
    if (list->key_length == key_length &&
	!memcmp(list->table_cache_key,key,key_length))
    {
      if (thd->locked_tables)
	mysql_lock_remove(thd, thd->locked_tables,list);
      VOID(hash_delete(&open_cache,(byte*) list)); // Close table
    }
    else
    {
      *prev=list;				// put in use list
      prev= &list->next;
    }
  }
  *prev=0;
  // Notify any 'refresh' threads
  pthread_cond_broadcast(&COND_refresh);
  return start;
}


689
/*
unknown's avatar
unknown committed
690
   When we call the following function we must have a lock on
691
   LOCK_open ; This lock will be unlocked on return.
unknown's avatar
unknown committed
692 693 694 695
*/

void wait_for_refresh(THD *thd)
{
696 697
  safe_mutex_assert_owner(&LOCK_open);

unknown's avatar
unknown committed
698 699 700 701 702 703
  /* Wait until the current table is up to date */
  const char *proc_info;
  thd->mysys_var->current_mutex= &LOCK_open;
  thd->mysys_var->current_cond= &COND_refresh;
  proc_info=thd->proc_info;
  thd->proc_info="Waiting for table";
unknown's avatar
unknown committed
704 705
  if (!thd->killed)
    (void) pthread_cond_wait(&COND_refresh,&LOCK_open);
unknown's avatar
unknown committed
706 707 708 709 710 711 712 713 714

  pthread_mutex_unlock(&LOCK_open);	// Must be unlocked first
  pthread_mutex_lock(&thd->mysys_var->mutex);
  thd->mysys_var->current_mutex= 0;
  thd->mysys_var->current_cond= 0;
  thd->proc_info= proc_info;
  pthread_mutex_unlock(&thd->mysys_var->mutex);
}

715

716 717 718 719 720 721
TABLE *reopen_name_locked_table(THD* thd, TABLE_LIST* table_list)
{
  DBUG_ENTER("reopen_name_locked_table");
  if (thd->killed)
    DBUG_RETURN(0);
  TABLE* table;
unknown's avatar
unknown committed
722
  if (!(table = table_list->table))
723 724 725
    DBUG_RETURN(0);

  char* db = thd->db ? thd->db : table_list->db;
726
  char* table_name = table_list->real_name;
727 728 729 730 731
  char	key[MAX_DBKEY_LENGTH];
  uint	key_length;
  key_length=(uint) (strmov(strmov(key,db)+1,table_name)-key)+1;

  pthread_mutex_lock(&LOCK_open);
unknown's avatar
unknown committed
732
  if (open_unireg_entry(thd, table, db, table_name, table_name) ||
unknown's avatar
unknown committed
733 734
      !(table->table_cache_key =memdup_root(&table->mem_root,(char*) key,
					    key_length)))
unknown's avatar
unknown committed
735 736 737 738 739
  {
    closefrm(table);
    pthread_mutex_unlock(&LOCK_open);
    DBUG_RETURN(0);
  }
740

741
  table->key_length=key_length;
unknown's avatar
unknown committed
742 743
  table->version=0;
  table->flush_version=0;
744 745 746
  table->in_use = thd;
  check_unused();
  pthread_mutex_unlock(&LOCK_open);
unknown's avatar
unknown committed
747 748
  table->next = thd->open_tables;
  thd->open_tables = table;
749 750 751
  table->tablenr=thd->current_tablenr++;
  table->used_fields=0;
  table->const_table=0;
752
  table->outer_join= table->null_row= table->maybe_null= table->force_index= 0;
753
  table->status=STATUS_NO_RECORD;
754 755
  table->keys_in_use_for_query= table->keys_in_use;
  table->used_keys= table->keys_for_keyread;
756
  DBUG_RETURN(table);
757 758
}

unknown's avatar
unknown committed
759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782

/******************************************************************************
** open a table
** Uses a cache of open tables to find a table not in use.
** If refresh is a NULL pointer, then the is no version number checking and
** the table is not put in the thread-open-list
** If the return value is NULL and refresh is set then one must close
** all tables and retry the open
******************************************************************************/


TABLE *open_table(THD *thd,const char *db,const char *table_name,
		  const char *alias,bool *refresh)
{
  reg1	TABLE *table;
  char	key[MAX_DBKEY_LENGTH];
  uint	key_length;
  DBUG_ENTER("open_table");

  /* find a unused table in the open table cache */
  if (refresh)
    *refresh=0;
  if (thd->killed)
    DBUG_RETURN(0);
783
  key_length= (uint) (strmov(strmov(key,db)+1,table_name)-key)+1;
unknown's avatar
unknown committed
784
  int4store(key + key_length, thd->server_id);
unknown's avatar
unknown committed
785
  int4store(key + key_length + 4, thd->variables.pseudo_thread_id);
786

unknown's avatar
unknown committed
787 788
  for (table=thd->temporary_tables; table ; table=table->next)
  {
unknown's avatar
unknown committed
789 790
    if (table->key_length == key_length+8 &&
	!memcmp(table->table_cache_key,key,key_length+8))
unknown's avatar
unknown committed
791 792 793 794 795 796 797 798
    {
      if (table->query_id == thd->query_id)
      {
	my_printf_error(ER_CANT_REOPEN_TABLE,
			ER(ER_CANT_REOPEN_TABLE),MYF(0),table->table_name);
	DBUG_RETURN(0);
      }
      table->query_id=thd->query_id;
unknown's avatar
unknown committed
799
      table->clear_query_id=1;
unknown's avatar
unknown committed
800
      thd->tmp_table_used= 1;
unknown's avatar
unknown committed
801 802 803 804 805 806 807 808 809 810
      goto reset;
    }
  }

  if (thd->locked_tables)
  {						// Using table locks
    for (table=thd->open_tables; table ; table=table->next)
    {
      if (table->key_length == key_length &&
	  !memcmp(table->table_cache_key,key,key_length) &&
811
	  !my_strcasecmp(system_charset_info,table->table_name,alias))
unknown's avatar
unknown committed
812 813 814 815 816
	goto reset;
    }
    my_printf_error(ER_TABLE_NOT_LOCKED,ER(ER_TABLE_NOT_LOCKED),MYF(0),alias);
    DBUG_RETURN(0);
  }
unknown's avatar
unknown committed
817

unknown's avatar
unknown committed
818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839
  VOID(pthread_mutex_lock(&LOCK_open));

  if (!thd->open_tables)
    thd->version=refresh_version;
  else if (thd->version != refresh_version && refresh)
  {
    /* Someone did a refresh while thread was opening tables */
    *refresh=1;
    VOID(pthread_mutex_unlock(&LOCK_open));
    DBUG_RETURN(0);
  }

  for (table=(TABLE*) hash_search(&open_cache,(byte*) key,key_length) ;
       table && table->in_use ;
       table = (TABLE*) hash_next(&open_cache,(byte*) key,key_length))
  {
    if (table->version != refresh_version)
    {
      /*
      ** There is a refresh in progress for this table
      ** Wait until the table is freed or the thread is killed.
      */
unknown's avatar
unknown committed
840
      close_old_data_files(thd,thd->open_tables,0,0);
unknown's avatar
unknown committed
841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859
      if (table->in_use != thd)
	wait_for_refresh(thd);
      else
	VOID(pthread_mutex_unlock(&LOCK_open));
      if (refresh)
	*refresh=1;
      DBUG_RETURN(0);
    }
  }
  if (table)
  {
    if (table == unused_tables)
    {						// First unused
      unused_tables=unused_tables->next;	// Remove from link
      if (table == unused_tables)
	unused_tables=0;
    }
    table->prev->next=table->next;		/* Remove from unused list */
    table->next->prev=table->prev;
unknown's avatar
unknown committed
860

unknown's avatar
unknown committed
861 862 863 864
  }
  else
  {
    /* Free cache if too big */
865
    while (open_cache.records > table_cache_size && unused_tables)
unknown's avatar
unknown committed
866 867 868 869
      VOID(hash_delete(&open_cache,(byte*) unused_tables)); /* purecov: tested */

    /* make a new table */
    if (!(table=(TABLE*) my_malloc(sizeof(*table),MYF(MY_WME))))
870 871
    {
      VOID(pthread_mutex_unlock(&LOCK_open));
unknown's avatar
unknown committed
872
      DBUG_RETURN(NULL);
873
    }
unknown's avatar
unknown committed
874
    if (open_unireg_entry(thd, table,db,table_name,alias) ||
unknown's avatar
unknown committed
875 876 877 878 879 880 881 882 883 884 885 886
	!(table->table_cache_key=memdup_root(&table->mem_root,(char*) key,
					     key_length)))
    {
      table->next=table->prev=table;
      free_cache_entry(table);
      VOID(pthread_mutex_unlock(&LOCK_open));
      DBUG_RETURN(NULL);
    }
    table->key_length=key_length;
    table->version=refresh_version;
    table->flush_version=flush_version;
    DBUG_PRINT("info", ("inserting table %p into the cache", table));
unknown's avatar
SCRUM  
unknown committed
887
    VOID(my_hash_insert(&open_cache,(byte*) table));
unknown's avatar
unknown committed
888 889 890
  }

  table->in_use=thd;
891
  check_unused();				// Debugging call
unknown's avatar
unknown committed
892
       
unknown's avatar
unknown committed
893 894 895 896 897 898 899 900 901 902 903 904
  VOID(pthread_mutex_unlock(&LOCK_open));
  if (refresh)
  {
    table->next=thd->open_tables;		/* Link into simple list */
    thd->open_tables=table;
  }
  table->reginfo.lock_type=TL_READ;		/* Assume read */

 reset:
  /* Fix alias if table name changes */
  if (strcmp(table->table_name,alias))
  {
unknown's avatar
unknown committed
905
    uint length=(uint) strlen(alias)+1;
unknown's avatar
unknown committed
906 907 908 909 910 911 912 913 914 915
    table->table_name= (char*) my_realloc(table->table_name,length,
					  MYF(MY_WME));
    memcpy(table->table_name,alias,length);
    for (uint i=0 ; i < table->fields ; i++)
      table->field[i]->table_name=table->table_name;
  }
  /* These variables are also set in reopen_table() */
  table->tablenr=thd->current_tablenr++;
  table->used_fields=0;
  table->const_table=0;
916
  table->outer_join= table->null_row= table->maybe_null= table->force_index= 0;
unknown's avatar
unknown committed
917
  table->status=STATUS_NO_RECORD;
918 919
  table->keys_in_use_for_query= table->keys_in_use;
  table->used_keys= table->keys_for_keyread;
unknown's avatar
unknown committed
920
  DBUG_ASSERT(table->key_read == 0);
unknown's avatar
unknown committed
921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963
  DBUG_RETURN(table);
}


TABLE *find_locked_table(THD *thd, const char *db,const char *table_name)
{
  char	key[MAX_DBKEY_LENGTH];
  uint key_length=(uint) (strmov(strmov(key,db)+1,table_name)-key)+1;

  for (TABLE *table=thd->open_tables; table ; table=table->next)
  {
    if (table->key_length == key_length &&
	!memcmp(table->table_cache_key,key,key_length))
      return table;
  }
  return(0);
}


/****************************************************************************
** Reopen an table because the definition has changed. The date file for the
** table is already closed.
** Returns 0 if ok.
** If table can't be reopened, the entry is unchanged.
****************************************************************************/

bool reopen_table(TABLE *table,bool locked)
{
  TABLE tmp;
  char *db=table->table_cache_key;
  char *table_name=table->real_name;
  bool error=1;
  Field **field;
  uint key,part;
  DBUG_ENTER("reopen_table");

#ifdef EXTRA_DEBUG
  if (table->db_stat)
    sql_print_error("Table %s had a open data handler in reopen_table",
		    table->table_name);
#endif
  if (!locked)
    VOID(pthread_mutex_lock(&LOCK_open));
964
  safe_mutex_assert_owner(&LOCK_open);
unknown's avatar
unknown committed
965

unknown's avatar
unknown committed
966
  if (open_unireg_entry(current_thd,&tmp,db,table_name,table->table_name))
unknown's avatar
unknown committed
967 968 969 970 971 972 973 974 975 976
    goto end;
  free_io_cache(table);

  if (!(tmp.table_cache_key= memdup_root(&tmp.mem_root,db,
					 table->key_length)))
  {
    closefrm(&tmp);				// End of memory
    goto end;
  }

977
  /* This list copies variables set by open_table */
unknown's avatar
unknown committed
978 979 980 981 982
  tmp.tablenr=		table->tablenr;
  tmp.used_fields=	table->used_fields;
  tmp.const_table=	table->const_table;
  tmp.outer_join=	table->outer_join;
  tmp.null_row=		table->null_row;
983
  tmp.maybe_null=	table->maybe_null;
unknown's avatar
unknown committed
984
  tmp.status=		table->status;
985 986
  tmp.keys_in_use_for_query= tmp.keys_in_use;
  tmp.used_keys= 	tmp.keys_for_keyread;
987
  tmp.force_index=	tmp.force_index;
988 989 990 991 992 993 994

  /* Get state */
  tmp.key_length=	table->key_length;
  tmp.in_use=    	table->in_use;
  tmp.reginfo.lock_type=table->reginfo.lock_type;
  tmp.version=		refresh_version;
  tmp.tmp_table=	table->tmp_table;
unknown's avatar
unknown committed
995 996
  tmp.grant=		table->grant;

997
  /* Replace table in open list */
998 999
  tmp.next=		table->next;
  tmp.prev=		table->prev;
1000

unknown's avatar
unknown committed
1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055
  if (table->file)
    VOID(closefrm(table));		// close file, free everything

  *table=tmp;
  table->file->change_table_ptr(table);

  for (field=table->field ; *field ; field++)
  {
    (*field)->table=table;
    (*field)->table_name=table->table_name;
  }
  for (key=0 ; key < table->keys ; key++)
    for (part=0 ; part < table->key_info[key].usable_key_parts ; part++)
      table->key_info[key].key_part[part].field->table=table;
  VOID(pthread_cond_broadcast(&COND_refresh));
  error=0;

 end:
  if (!locked)
    VOID(pthread_mutex_unlock(&LOCK_open));
  DBUG_RETURN(error);
}


/*
  Used with ALTER TABLE:
  Close all instanses of table when LOCK TABLES is in used;
  Close first all instances of table and then reopen them
 */

bool close_data_tables(THD *thd,const char *db, const char *table_name)
{
  TABLE *table;
  for (table=thd->open_tables; table ; table=table->next)
  {
    if (!strcmp(table->real_name,table_name) &&
	!strcmp(table->table_cache_key,db))
    {
      mysql_lock_remove(thd, thd->locked_tables,table);
      table->file->close();
      table->db_stat=0;
    }
  }
  return 0;					// For the future
}


/*
  Reopen all tables with closed data files
  One should have lock on LOCK_open when calling this
*/

bool reopen_tables(THD *thd,bool get_locks,bool in_refresh)
{
  DBUG_ENTER("reopen_tables");
1056 1057
  safe_mutex_assert_owner(&LOCK_open);

unknown's avatar
unknown committed
1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125
  if (!thd->open_tables)
    DBUG_RETURN(0);

  TABLE *table,*next,**prev;
  TABLE **tables,**tables_ptr;			// For locks
  bool error=0;
  if (get_locks)
  {
    /* The ptr is checked later */
    uint opens=0;
    for (table=thd->open_tables; table ; table=table->next) opens++;
    tables= (TABLE**) my_alloca(sizeof(TABLE*)*opens);
  }
  else
    tables= &thd->open_tables;
  tables_ptr =tables;

  prev= &thd->open_tables;
  for (table=thd->open_tables; table ; table=next)
  {
    uint db_stat=table->db_stat;
    next=table->next;
    if (!tables || (!db_stat && reopen_table(table,1)))
    {
      my_error(ER_CANT_REOPEN_TABLE,MYF(0),table->table_name);
      VOID(hash_delete(&open_cache,(byte*) table));
      error=1;
    }
    else
    {
      *prev= table;
      prev= &table->next;
      if (get_locks && !db_stat)
	*tables_ptr++= table;			// need new lock on this
      if (in_refresh)
      {
	table->version=0;
	table->locked_by_flush=0;
      }
    }
  }
  if (tables != tables_ptr)			// Should we get back old locks
  {
    MYSQL_LOCK *lock;
    /* We should always get these locks */
    thd->some_tables_deleted=0;
    if ((lock=mysql_lock_tables(thd,tables,(uint) (tables_ptr-tables))))
    {
      thd->locked_tables=mysql_lock_merge(thd->locked_tables,lock);
    }
    else
      error=1;
  }
  if (get_locks && tables)
  {
    my_afree((gptr) tables);
  }
  VOID(pthread_cond_broadcast(&COND_refresh)); // Signal to refresh
  *prev=0;
  DBUG_RETURN(error);
}

/*
  Close handlers for tables in list, but leave the TABLE structure
  intact so that we can re-open these quickly
  abort_locks is set if called from flush_tables.
*/

unknown's avatar
unknown committed
1126 1127
void close_old_data_files(THD *thd, TABLE *table, bool abort_locks,
			  bool send_refresh)
unknown's avatar
unknown committed
1128
{
unknown's avatar
unknown committed
1129 1130
  DBUG_ENTER("close_old_data_files");
  bool found=send_refresh;
unknown's avatar
unknown committed
1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152
  for (; table ; table=table->next)
  {
    if (table->version != refresh_version)
    {
      found=1;
      if (!abort_locks)				// If not from flush tables
	table->version = refresh_version;	// Let other threads use table
      if (table->db_stat)
      {
	if (abort_locks)
	{
	  mysql_lock_abort(thd,table);		// Close waiting threads
	  mysql_lock_remove(thd, thd->locked_tables,table);
	  table->locked_by_flush=1;		// Will be reopened with locks
	}
	table->file->close();
	table->db_stat=0;
      }
    }
  }
  if (found)
    VOID(pthread_cond_broadcast(&COND_refresh)); // Signal to refresh
unknown's avatar
unknown committed
1153
  DBUG_VOID_RETURN;
unknown's avatar
unknown committed
1154 1155 1156 1157 1158 1159 1160 1161 1162
}


/*
  Wait until all threads has closed the tables in the list
  We have also to wait if there is thread that has a lock on this table even
  if the table is closed
*/

unknown's avatar
unknown committed
1163
bool table_is_used(TABLE *table, bool wait_for_name_lock)
unknown's avatar
unknown committed
1164 1165 1166 1167 1168
{
  do
  {
    char *key= table->table_cache_key;
    uint key_length=table->key_length;
unknown's avatar
unknown committed
1169 1170
    for (TABLE *search=(TABLE*) hash_search(&open_cache,
					    (byte*) key,key_length) ;
unknown's avatar
unknown committed
1171 1172 1173 1174
	 search ;
	 search = (TABLE*) hash_next(&open_cache,(byte*) key,key_length))
    {
      if (search->locked_by_flush ||
unknown's avatar
unknown committed
1175
	  search->locked_by_name && wait_for_name_lock ||
unknown's avatar
unknown committed
1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192
	  search->db_stat && search->version < refresh_version)
	return 1;				// Table is used
    }
  } while ((table=table->next));
  return 0;
}


/* Wait until all used tables are refreshed */

bool wait_for_tables(THD *thd)
{
  bool result;
  DBUG_ENTER("wait_for_tables");

  thd->proc_info="Waiting for tables";
  pthread_mutex_lock(&LOCK_open);
unknown's avatar
unknown committed
1193
  while (!thd->killed)
unknown's avatar
unknown committed
1194
  {
unknown's avatar
unknown committed
1195 1196 1197 1198
    thd->some_tables_deleted=0;
    close_old_data_files(thd,thd->open_tables,0,dropping_tables != 0);
    if (!table_is_used(thd->open_tables,1))
      break;
1199
    (void) pthread_cond_wait(&COND_refresh,&LOCK_open);
unknown's avatar
unknown committed
1200 1201 1202 1203 1204 1205 1206
  }
  if (thd->killed)
    result= 1;					// aborted
  else
  {
    /* Now we can open all tables without any interference */
    thd->proc_info="Reopen tables";
1207
    result=reopen_tables(thd,0,0);
1208
  }
unknown's avatar
unknown committed
1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249
  pthread_mutex_unlock(&LOCK_open);
  thd->proc_info=0;
  DBUG_RETURN(result);
}


/* drop tables from locked list */

bool drop_locked_tables(THD *thd,const char *db, const char *table_name)
{
  TABLE *table,*next,**prev;
  bool found=0;
  prev= &thd->open_tables;
  for (table=thd->open_tables; table ; table=next)
  {
    next=table->next;
    if (!strcmp(table->real_name,table_name) &&
	!strcmp(table->table_cache_key,db))
    {
      mysql_lock_remove(thd, thd->locked_tables,table);
      VOID(hash_delete(&open_cache,(byte*) table));
      found=1;
    }
    else
    {
      *prev=table;
      prev= &table->next;
    }
  }
  *prev=0;
  if (found)
    VOID(pthread_cond_broadcast(&COND_refresh)); // Signal to refresh
  if (thd->locked_tables && thd->locked_tables->table_count == 0)
  {
    my_free((gptr) thd->locked_tables,MYF(0));
    thd->locked_tables=0;
  }
  return found;
}


1250 1251 1252 1253 1254
/*
  If we have the table open, which only happens when a LOCK TABLE has been
  done on the table, change the lock type to a lock that will abort all
  other threads trying to get the lock.
*/
unknown's avatar
unknown committed
1255 1256 1257 1258

void abort_locked_tables(THD *thd,const char *db, const char *table_name)
{
  TABLE *table;
1259
  for (table= thd->open_tables; table ; table= table->next)
unknown's avatar
unknown committed
1260 1261 1262
  {
    if (!strcmp(table->real_name,table_name) &&
	!strcmp(table->table_cache_key,db))
1263
    {
unknown's avatar
unknown committed
1264
      mysql_lock_abort(thd,table);
1265 1266
      break;
    }
unknown's avatar
unknown committed
1267 1268 1269
  }
}

1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287

/*
  Load a table definition from file and open unireg table

  SYNOPSIS
    open_unireg_entry()
    thd			Thread handle
    entry		Store open table definition here
    db			Database name
    name		Table name
    alias		Alias name

  NOTES
   Extra argument for open is taken from thd->open_options

  RETURN
    0	ok
    #	Error
unknown's avatar
unknown committed
1288 1289
*/

1290
static int open_unireg_entry(THD *thd, TABLE *entry, const char *db,
unknown's avatar
unknown committed
1291
			     const char *name, const char *alias)
unknown's avatar
unknown committed
1292 1293
{
  char path[FN_REFLEN];
1294
  int error;
unknown's avatar
unknown committed
1295 1296
  DBUG_ENTER("open_unireg_entry");

1297
  strxmov(path, mysql_data_home, "/", db, "/", name, NullS);
unknown's avatar
unknown committed
1298
  if (openfrm(path,alias,
1299 1300 1301
	       (uint) (HA_OPEN_KEYFILE | HA_OPEN_RNDFILE | HA_GET_INDEX |
		       HA_TRY_READ_ONLY),
	       READ_KEYINFO | COMPUTE_TYPES | EXTRA_RECORD,
1302
	      thd->open_options, entry))
unknown's avatar
unknown committed
1303
  {
1304 1305 1306 1307
    if (!entry->crashed)
      goto err;					// Can't repair the table

    TABLE_LIST table_list;
1308
    bzero((char*) &table_list, sizeof(table_list)); // just for safe
1309
    table_list.db=(char*) db;
1310
    table_list.real_name=(char*) name;
1311
    table_list.next=0;
1312 1313
    safe_mutex_assert_owner(&LOCK_open);

1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326
    if ((error=lock_table_name(thd,&table_list)))
    {
      if (error < 0)
      {
	goto err;
      }
      if (wait_for_locked_table_names(thd,&table_list))
      {
	unlock_table_name(thd,&table_list);
	goto err;
      }
    }
    pthread_mutex_unlock(&LOCK_open);
unknown's avatar
unknown committed
1327 1328
    thd->clear_error();				// Clear error message
    error= 0;
1329 1330 1331 1332 1333
    if (openfrm(path,alias,
		(uint) (HA_OPEN_KEYFILE | HA_OPEN_RNDFILE | HA_GET_INDEX |
			 HA_TRY_READ_ONLY),
		READ_KEYINFO | COMPUTE_TYPES | EXTRA_RECORD,
		ha_open_options | HA_OPEN_FOR_REPAIR,
1334
		entry) || ! entry->file ||
1335 1336
	(entry->file->is_crashed() && entry->file->check_and_repair(thd)))
    {
unknown's avatar
unknown committed
1337
      /* Give right error message */
unknown's avatar
unknown committed
1338
      thd->clear_error();
1339
      my_error(ER_NOT_KEYFILE, MYF(0), name, my_errno);
1340
      sql_print_error("Error: Couldn't repair table: %s.%s",db,name);
1341 1342
      if (entry->file)
	closefrm(entry);
1343 1344
      error=1;
    }
1345 1346
    else
    {
unknown's avatar
unknown committed
1347
      thd->clear_error();			// Clear error message
1348
    }
unknown's avatar
unknown committed
1349
    pthread_mutex_lock(&LOCK_open);
1350
    unlock_table_name(thd,&table_list);
unknown's avatar
unknown committed
1351

1352 1353
    if (error)
      goto err;
unknown's avatar
unknown committed
1354 1355
  }
  DBUG_RETURN(0);
1356 1357
err:
  DBUG_RETURN(1);
unknown's avatar
unknown committed
1358 1359 1360 1361 1362 1363 1364 1365 1366 1367 1368 1369 1370
}

/*****************************************************************************
** open all tables in list
*****************************************************************************/

int open_tables(THD *thd,TABLE_LIST *start)
{
  TABLE_LIST *tables;
  bool refresh;
  int result=0;
  DBUG_ENTER("open_tables");

1371
  thd->current_tablenr= 0;
unknown's avatar
unknown committed
1372 1373 1374 1375
 restart:
  thd->proc_info="Opening tables";
  for (tables=start ; tables ; tables=tables->next)
  {
1376 1377
    if (tables->derived)
      continue;
unknown's avatar
unknown committed
1378
    if (!tables->table &&
1379 1380 1381 1382
	!(tables->table= open_table(thd,
				    tables->db,
				    tables->real_name,
				    tables->alias, &refresh)))
unknown's avatar
unknown committed
1383 1384 1385 1386 1387
    {
      if (refresh)				// Refresh in progress
      {
	/* close all 'old' tables used by this thread */
	pthread_mutex_lock(&LOCK_open);
1388 1389
	// if query_id is not reset, we will get an error
	// re-opening a temp table
unknown's avatar
unknown committed
1390 1391 1392 1393 1394
	thd->version=refresh_version;
	TABLE **prev_table= &thd->open_tables;
	bool found=0;
	for (TABLE_LIST *tmp=start ; tmp ; tmp=tmp->next)
	{
1395 1396
	  /* Close normal (not temporary) changed tables */
	  if (tmp->table && ! tmp->table->tmp_table)
unknown's avatar
unknown committed
1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412
	  {
	    if (tmp->table->version != refresh_version ||
		! tmp->table->db_stat)
	    {
	      VOID(hash_delete(&open_cache,(byte*) tmp->table));
	      tmp->table=0;
	      found=1;
	    }
	    else
	    {
	      *prev_table= tmp->table;		// Relink open list
	      prev_table= &tmp->table->next;
	    }
	  }
	}
	*prev_table=0;
1413
	pthread_mutex_unlock(&LOCK_open);
unknown's avatar
unknown committed
1414 1415 1416 1417 1418 1419 1420
	if (found)
	  VOID(pthread_cond_broadcast(&COND_refresh)); // Signal to refresh
	goto restart;
      }
      result= -1;				// Fatal error
      break;
    }
1421
    if (tables->lock_type != TL_UNLOCK && ! thd->locked_tables)
unknown's avatar
unknown committed
1422 1423 1424 1425 1426 1427 1428 1429
      tables->table->reginfo.lock_type=tables->lock_type;
    tables->table->grant= tables->grant;
  }
  thd->proc_info=0;
  DBUG_RETURN(result);
}


unknown's avatar
unknown committed
1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484
/*
  Check that lock is ok for tables; Call start stmt if ok

  SYNOPSIS
    check_lock_and_start_stmt()
    thd			Thread handle
    table_list		Table to check
    lock_type		Lock used for table

  RETURN VALUES
  0	ok
  1	error
*/

static bool check_lock_and_start_stmt(THD *thd, TABLE *table,
				      thr_lock_type lock_type)
{
  int error;
  DBUG_ENTER("check_lock_and_start_stmt");

  if ((int) lock_type >= (int) TL_WRITE_ALLOW_READ &&
      (int) table->reginfo.lock_type < (int) TL_WRITE_ALLOW_READ)
  {
    my_printf_error(ER_TABLE_NOT_LOCKED_FOR_WRITE,
		    ER(ER_TABLE_NOT_LOCKED_FOR_WRITE),
		    MYF(0),table->table_name);
    DBUG_RETURN(1);
  }
  if ((error=table->file->start_stmt(thd)))
  {
    table->file->print_error(error,MYF(0));
    DBUG_RETURN(1);
  }
  DBUG_RETURN(0);
}


/*
  Open and lock one table

  SYNOPSIS
    open_ltable()
    thd			Thread handler
    table_list		Table to open is first table in this list
    lock_type		Lock to use for open

  RETURN VALUES
    table		Opened table
    0			Error
  
    If ok, the following are also set:
      table_list->lock_type 	lock_type
      table_list->table		table
*/

unknown's avatar
unknown committed
1485 1486 1487 1488 1489 1490 1491
TABLE *open_ltable(THD *thd, TABLE_LIST *table_list, thr_lock_type lock_type)
{
  TABLE *table;
  bool refresh;
  DBUG_ENTER("open_ltable");

  thd->proc_info="Opening table";
1492
  thd->current_tablenr= 0;
1493
  while (!(table=open_table(thd,table_list->db,
1494
			    table_list->real_name,table_list->alias,
unknown's avatar
unknown committed
1495
			    &refresh)) && refresh) ;
unknown's avatar
unknown committed
1496

unknown's avatar
unknown committed
1497 1498
  if (table)
  {
unknown's avatar
unknown committed
1499
#if defined( __WIN__) || defined(OS2)
1500
    /* Win32 can't drop a file that is open */
unknown's avatar
unknown committed
1501
    if (lock_type == TL_WRITE_ALLOW_READ)
1502 1503 1504
    {
      lock_type= TL_WRITE;
    }
unknown's avatar
unknown committed
1505
#endif /* __WIN__ || OS2 */
unknown's avatar
unknown committed
1506 1507
    table_list->lock_type= lock_type;
    table_list->table=	   table;
unknown's avatar
unknown committed
1508 1509 1510
    table->grant= table_list->grant;
    if (thd->locked_tables)
    {
unknown's avatar
unknown committed
1511 1512 1513 1514 1515
      if (check_lock_and_start_stmt(thd, table, lock_type))
	table= 0;
    }
    else
    {
1516
      DBUG_ASSERT(thd->lock == 0);	// You must lock everything at once
unknown's avatar
unknown committed
1517 1518 1519
      if ((table->reginfo.lock_type= lock_type) != TL_UNLOCK)
	if (!(thd->lock=mysql_lock_tables(thd,&table_list->table,1)))
	  table= 0;
unknown's avatar
unknown committed
1520 1521 1522 1523 1524 1525
    }
  }
  thd->proc_info=0;
  DBUG_RETURN(table);
}

unknown's avatar
unknown committed
1526

unknown's avatar
unknown committed
1527
/*
1528 1529 1530 1531 1532 1533 1534 1535 1536 1537
  Open all tables in list and locks them for read without derived
  tables processing.

  SYNOPSIS
    simple_open_n_lock_tables()
    thd		- thread handler
    tables	- list of tables for open&locking

  NOTE
    The lock will automaticly be freed by close_thread_tables()
unknown's avatar
unknown committed
1538 1539
*/

1540
int simple_open_n_lock_tables(THD *thd, TABLE_LIST *tables)
unknown's avatar
unknown committed
1541
{
1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568
  DBUG_ENTER("open_n_lock_tables");
  if (open_tables(thd, tables) || lock_tables(thd, tables))
    DBUG_RETURN(-1);				/* purecov: inspected */
  DBUG_RETURN(0);
}


/*
  Open all tables in list, locks them and process derived tables
  tables processing.

  SYNOPSIS
    simple_open_n_lock_tables()
    thd		- thread handler
    tables	- list of tables for open&locking

  NOTE
    The lock will automaticly be freed by close_thread_tables()
*/

int open_and_lock_tables(THD *thd, TABLE_LIST *tables)
{
  DBUG_ENTER("open_and_lock_tables");
  if (open_tables(thd, tables) || lock_tables(thd, tables))
    DBUG_RETURN(-1);				/* purecov: inspected */
  fix_tables_pointers(thd->lex->all_selects_list);
  DBUG_RETURN(mysql_handle_derived(thd->lex));
unknown's avatar
unknown committed
1569 1570
}

unknown's avatar
unknown committed
1571 1572 1573 1574 1575 1576 1577 1578 1579

/*
  Lock all tables in list

  SYNOPSIS
    lock_tables()
    thd			Thread handler
    tables		Tables to lock

1580 1581 1582 1583 1584
  NOTES
    You can't call lock_tables twice, as this would break the dead-lock-free
    handling thr_lock gives us.  You most always get all needed locks at
    once.

unknown's avatar
unknown committed
1585 1586 1587 1588 1589
  RETURN VALUES
   0	ok
   -1	Error
*/

unknown's avatar
unknown committed
1590 1591
int lock_tables(THD *thd,TABLE_LIST *tables)
{
unknown's avatar
unknown committed
1592
  TABLE_LIST *table;
unknown's avatar
unknown committed
1593 1594 1595 1596
  if (!tables)
    return 0;

  if (!thd->locked_tables)
unknown's avatar
unknown committed
1597
  {
1598
    DBUG_ASSERT(thd->lock == 0);	// You must lock everything at once
unknown's avatar
unknown committed
1599 1600
    uint count=0;
    for (table = tables ; table ; table=table->next)
1601 1602 1603 1604
    {
      if (!table->derived)
	count++;
    }
unknown's avatar
unknown committed
1605 1606 1607 1608
    TABLE **start,**ptr;
    if (!(ptr=start=(TABLE**) sql_alloc(sizeof(TABLE*)*count)))
      return -1;
    for (table = tables ; table ; table=table->next)
1609 1610 1611 1612
    {
      if (!table->derived)
	*(ptr++)= table->table;
    }
unknown's avatar
unknown committed
1613 1614 1615
    if (!(thd->lock=mysql_lock_tables(thd,start,count)))
      return -1;				/* purecov: inspected */
  }
unknown's avatar
unknown committed
1616 1617 1618 1619
  else
  {
    for (table = tables ; table ; table=table->next)
    {
1620 1621
      if (!table->derived && 
	  check_lock_and_start_stmt(thd, table->table, table->lock_type))
unknown's avatar
unknown committed
1622
      {
unknown's avatar
unknown committed
1623
	ha_rollback_stmt(thd);
unknown's avatar
unknown committed
1624 1625 1626 1627
	return -1;
      }
    }
  }
unknown's avatar
unknown committed
1628 1629 1630
  return 0;
}

unknown's avatar
unknown committed
1631

unknown's avatar
unknown committed
1632
/*
unknown's avatar
unknown committed
1633 1634 1635
  Open a single table without table caching and don't set it in open_list
  Used by alter_table to open a temporary table and when creating
  a temporary table with CREATE TEMPORARY ...
unknown's avatar
unknown committed
1636 1637 1638 1639 1640 1641 1642
*/

TABLE *open_temporary_table(THD *thd, const char *path, const char *db,
			    const char *table_name, bool link_in_list)
{
  TABLE *tmp_table;
  DBUG_ENTER("open_temporary_table");
1643

unknown's avatar
unknown committed
1644 1645 1646 1647 1648 1649 1650
  /*
    The extra size in my_malloc() is for table_cache_key
    4 bytes for master thread id if we are in the slave
    1 byte to terminate db
    1 byte to terminate table_name
    total of 6 extra bytes in my_malloc in addition to table/db stuff
  */
unknown's avatar
unknown committed
1651
  if (!(tmp_table=(TABLE*) my_malloc(sizeof(*tmp_table)+(uint) strlen(db)+
unknown's avatar
unknown committed
1652
				     (uint) strlen(table_name)+6+4,
unknown's avatar
unknown committed
1653 1654 1655 1656
				     MYF(MY_WME))))
    DBUG_RETURN(0);				/* purecov: inspected */

  if (openfrm(path, table_name,
unknown's avatar
unknown committed
1657
	      (uint) (HA_OPEN_KEYFILE | HA_OPEN_RNDFILE | HA_GET_INDEX),
unknown's avatar
unknown committed
1658
	      READ_KEYINFO | COMPUTE_TYPES | EXTRA_RECORD,
1659
	      ha_open_options,
unknown's avatar
unknown committed
1660 1661
	      tmp_table))
  {
1662
    my_free((char*) tmp_table,MYF(0));
unknown's avatar
unknown committed
1663 1664 1665
    DBUG_RETURN(0);
  }

unknown's avatar
unknown committed
1666 1667 1668
  tmp_table->reginfo.lock_type=TL_WRITE;	 // Simulate locked
  tmp_table->tmp_table = (tmp_table->file->has_transactions() ? 
			  TRANSACTIONAL_TMP_TABLE : TMP_TABLE);
unknown's avatar
unknown committed
1669
  tmp_table->table_cache_key=(char*) (tmp_table+1);
1670 1671 1672
  tmp_table->key_length= (uint) (strmov((tmp_table->real_name=
					 strmov(tmp_table->table_cache_key,db)
					 +1), table_name)
unknown's avatar
unknown committed
1673
				 - tmp_table->table_cache_key)+1;
unknown's avatar
unknown committed
1674 1675 1676
  int4store(tmp_table->table_cache_key + tmp_table->key_length,
	    thd->server_id);
  tmp_table->key_length += 4;
unknown's avatar
unknown committed
1677
  int4store(tmp_table->table_cache_key + tmp_table->key_length,
unknown's avatar
unknown committed
1678
	    thd->variables.pseudo_thread_id);
1679
  tmp_table->key_length += 4;
1680

unknown's avatar
unknown committed
1681 1682 1683 1684
  if (link_in_list)
  {
    tmp_table->next=thd->temporary_tables;
    thd->temporary_tables=tmp_table;
unknown's avatar
unknown committed
1685 1686
    if (thd->slave_thread)
      slave_open_temp_tables++;
unknown's avatar
unknown committed
1687 1688 1689 1690 1691 1692 1693 1694
  }
  DBUG_RETURN(tmp_table);
}


bool rm_temporary_table(enum db_type base, char *path)
{
  bool error=0;
1695 1696
  DBUG_ENTER("rm_temporary_table");

unknown's avatar
unknown committed
1697 1698 1699 1700 1701 1702 1703 1704 1705
  fn_format(path, path,"",reg_ext,4);
  unpack_filename(path,path);
  if (my_delete(path,MYF(0)))
    error=1; /* purecov: inspected */
  *fn_ext(path)='\0';				// remove extension
  handler *file=get_new_handler((TABLE*) 0, base);
  if (file && file->delete_table(path))
    error=1;
  delete file;
1706
  DBUG_RETURN(error);
unknown's avatar
unknown committed
1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728
}


/*****************************************************************************
** find field in list or tables. if field is unqualifed and unique,
** return unique field
******************************************************************************/

#define WRONG_GRANT (Field*) -1

Field *find_field_in_table(THD *thd,TABLE *table,const char *name,uint length,
			   bool check_grants, bool allow_rowid)
{
  Field *field;
  if (table->name_hash.records)
  {
    if ((field=(Field*) hash_search(&table->name_hash,(byte*) name,
				    length)))
      goto found;
  }
  else
  {
1729 1730 1731
    Field **ptr;
    if (!(ptr=table->field))
      return (Field *)0;
unknown's avatar
unknown committed
1732 1733
    while ((field = *ptr++))
    {
1734
      if (!my_strcasecmp(system_charset_info, field->field_name, name))
unknown's avatar
unknown committed
1735 1736 1737
	goto found;
    }
  }
1738
  if (allow_rowid &&
1739
      !my_strcasecmp(system_charset_info, name, "_rowid") &&
unknown's avatar
unknown committed
1740 1741 1742 1743 1744 1745 1746 1747 1748 1749
      (field=table->rowid_field))
    goto found;
  return (Field*) 0;

 found:
  if (thd->set_query_id)
  {
    if (field->query_id != thd->query_id)
    {
      field->query_id=thd->query_id;
1750
      table->used_fields++;
1751
      table->used_keys.intersect(field->part_of_key);
unknown's avatar
unknown committed
1752 1753 1754 1755
    }
    else
      thd->dupp_field=field;
  }
unknown's avatar
unknown committed
1756
#ifndef NO_EMBEDDED_ACCESS_CHECKS
1757
  if (check_grants && check_grant_column(thd,table,name,length))
unknown's avatar
unknown committed
1758
    return WRONG_GRANT;
unknown's avatar
unknown committed
1759
#endif
unknown's avatar
unknown committed
1760 1761 1762
  return field;
}

1763

1764 1765 1766 1767 1768
/*
  Find field in table list.

  SYNOPSIS
    find_field_in_tables()
1769 1770 1771 1772 1773 1774 1775
    thd			Pointer to current thread structure
    item		Field item that should be found
    tables		Tables for scaning
    where		Table where field found will be returned via
			this parameter
    report_error	If FALSE then do not report error if item not found
			and return not_found_field
1776 1777

  RETURN VALUES
1778 1779
    0			Field is not found or field is not unique- error
			message is reported
1780
    not_found_field	Function was called with report_error == FALSE and
1781
			field was not found. no error message reported.
1782 1783
    found field
*/
unknown's avatar
unknown committed
1784

1785 1786 1787
// Special Field pointer for find_field_in_tables returning
const Field *not_found_field= (Field*) 0x1;

unknown's avatar
unknown committed
1788
Field *
1789
find_field_in_tables(THD *thd, Item_ident *item, TABLE_LIST *tables,
1790
		     TABLE_LIST **where, bool report_error)
unknown's avatar
unknown committed
1791 1792 1793 1794 1795
{
  Field *found=0;
  const char *db=item->db_name;
  const char *table_name=item->table_name;
  const char *name=item->field_name;
unknown's avatar
unknown committed
1796
  uint length=(uint) strlen(name);
1797 1798 1799 1800 1801 1802 1803 1804 1805 1806
  char name_buff[NAME_LEN+1];

  if (db && lower_case_table_names)
  {
    /*
      convert database to lower case for comparision.
      We can't do this in Item_field as this would change the
      'name' of the item which may be used in the select list
    */
    strmake(name_buff, db, sizeof(name_buff)-1);
unknown's avatar
unknown committed
1807
    my_casedn_str(files_charset_info, name_buff);
1808 1809
    db= name_buff;
  }
unknown's avatar
unknown committed
1810

unknown's avatar
unknown committed
1811
  if (table_name && table_name[0])
unknown's avatar
unknown committed
1812 1813 1814 1815
  {						/* Qualified field */
    bool found_table=0;
    for (; tables ; tables=tables->next)
    {
1816
      if (!my_strcasecmp(table_alias_charset, tables->alias, table_name) &&
unknown's avatar
unknown committed
1817
	  (!db || !tables->db ||  !tables->db[0] || !strcmp(db,tables->db)))
unknown's avatar
unknown committed
1818 1819 1820
      {
	found_table=1;
	Field *find=find_field_in_table(thd,tables->table,name,length,
1821 1822
					test(tables->table->grant.
					     want_privilege),
unknown's avatar
unknown committed
1823
					1);
unknown's avatar
unknown committed
1824 1825
	if (find)
	{
1826
	  (*where)= tables;
unknown's avatar
unknown committed
1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842
	  if (find == WRONG_GRANT)
	    return (Field*) 0;
	  if (db || !thd->where)
	    return find;
	  if (found)
	  {
	    my_printf_error(ER_NON_UNIQ_ERROR,ER(ER_NON_UNIQ_ERROR),MYF(0),
			    item->full_name(),thd->where);
	    return (Field*) 0;
	  }
	  found=find;
	}
      }
    }
    if (found)
      return found;
unknown's avatar
unknown committed
1843
    if (!found_table && report_error)
unknown's avatar
unknown committed
1844 1845
    {
      char buff[NAME_LEN*2+1];
unknown's avatar
unknown committed
1846
      if (db && db[0])
unknown's avatar
unknown committed
1847
      {
1848
	strxnmov(buff,sizeof(buff)-1,db,".",table_name,NullS);
unknown's avatar
unknown committed
1849 1850
	table_name=buff;
      }
1851
      if (report_error)
1852
      {
unknown's avatar
unknown committed
1853 1854
	my_printf_error(ER_UNKNOWN_TABLE, ER(ER_UNKNOWN_TABLE), MYF(0),
			table_name, thd->where);
1855
      }
1856 1857
      else
	return (Field*) not_found_field;
unknown's avatar
unknown committed
1858 1859
    }
    else
unknown's avatar
unknown committed
1860 1861 1862
      if (report_error)
	my_printf_error(ER_BAD_FIELD_ERROR,ER(ER_BAD_FIELD_ERROR),MYF(0),
			item->full_name(),thd->where);
1863 1864
      else
	return (Field*) not_found_field;
unknown's avatar
unknown committed
1865 1866 1867 1868 1869
    return (Field*) 0;
  }
  bool allow_rowid= tables && !tables->next;	// Only one table
  for (; tables ; tables=tables->next)
  {
1870 1871 1872 1873 1874 1875 1876 1877
    if (!tables->table)
    {
      if (report_error)
	my_printf_error(ER_BAD_FIELD_ERROR,ER(ER_BAD_FIELD_ERROR),MYF(0),
			item->full_name(),thd->where);
      return (Field*) not_found_field;
    }

unknown's avatar
unknown committed
1878
    Field *field=find_field_in_table(thd,tables->table,name,length,
1879
				     test(tables->table->grant.want_privilege),
unknown's avatar
unknown committed
1880
				     allow_rowid);
unknown's avatar
unknown committed
1881 1882 1883 1884
    if (field)
    {
      if (field == WRONG_GRANT)
	return (Field*) 0;
1885
      (*where)= tables;
unknown's avatar
unknown committed
1886 1887
      if (found)
      {
1888
	if (!thd->where)			// Returns first found
unknown's avatar
unknown committed
1889
	  break;
1890 1891
	my_printf_error(ER_NON_UNIQ_ERROR,ER(ER_NON_UNIQ_ERROR),MYF(0),
			name,thd->where);
unknown's avatar
unknown committed
1892 1893 1894 1895 1896 1897 1898
	return (Field*) 0;
      }
      found=field;
    }
  }
  if (found)
    return found;
unknown's avatar
unknown committed
1899 1900 1901
  if (report_error)
    my_printf_error(ER_BAD_FIELD_ERROR, ER(ER_BAD_FIELD_ERROR),
		    MYF(0), item->full_name(), thd->where);
1902 1903
  else
    return (Field*) not_found_field;
unknown's avatar
unknown committed
1904 1905 1906
  return (Field*) 0;
}

1907 1908 1909

/*
  Find Item in list of items (find_field_in_tables analog)
1910 1911 1912 1913

  TODO
    is it better return only counter?

1914 1915
  SYNOPSIS
    find_item_in_list()
1916 1917 1918
    find			Item to find
    items			List of items
    counter			To return number of found item
1919
    report_error
1920 1921 1922 1923 1924
      REPORT_ALL_ERRORS		report errors, return 0 if error
      REPORT_EXCEPT_NOT_FOUND	Do not report 'not found' error and
				return not_found_item, report other errors,
				return 0
      IGNORE_ERRORS		Do not report errors, return 0 if error
1925 1926
      
  RETURN VALUES
1927 1928 1929 1930 1931
    0			Item is not found or item is not unique,
			error message is reported
    not_found_item	Function was called with
			report_error == REPORT_EXCEPT_NOT_FOUND and
			item was not found. No error message was reported
1932 1933 1934
    found field 
*/

1935 1936 1937 1938
// Special Item pointer for find_item_in_list returning
const Item **not_found_item= (const Item**) 0x1;


unknown's avatar
unknown committed
1939
Item **
1940
find_item_in_list(Item *find, List<Item> &items, uint *counter,
1941
		  find_item_error_report_type report_error)
unknown's avatar
unknown committed
1942 1943 1944
{
  List_iterator<Item> li(items);
  Item **found=0,*item;
1945
  const char *db_name=0;
unknown's avatar
unknown committed
1946 1947 1948 1949 1950 1951
  const char *field_name=0;
  const char *table_name=0;
  if (find->type() == Item::FIELD_ITEM	|| find->type() == Item::REF_ITEM)
  {
    field_name= ((Item_ident*) find)->field_name;
    table_name= ((Item_ident*) find)->table_name;
1952
    db_name=    ((Item_ident*) find)->db_name;
unknown's avatar
unknown committed
1953 1954
  }

1955
  for (uint i= 0; (item=li++); i++)
unknown's avatar
unknown committed
1956 1957 1958
  {
    if (field_name && item->type() == Item::FIELD_ITEM)
    {
1959 1960
      Item_field *item_field= (Item_field*) item;
      if (!my_strcasecmp(system_charset_info, item_field->name, field_name))
unknown's avatar
unknown committed
1961 1962 1963 1964 1965
      {
	if (!table_name)
	{
	  if (found)
	  {
1966
	    if ((*found)->eq(item,0))
unknown's avatar
unknown committed
1967
	      continue;				// Same field twice (Access?)
1968
	    if (report_error != IGNORE_ERRORS)
unknown's avatar
unknown committed
1969 1970 1971 1972
	      my_printf_error(ER_NON_UNIQ_ERROR,ER(ER_NON_UNIQ_ERROR),MYF(0),
			      find->full_name(), current_thd->where);
	    return (Item**) 0;
	  }
1973 1974
	  found= li.ref();
	  *counter= i;
unknown's avatar
unknown committed
1975
	}
1976
	else
unknown's avatar
unknown committed
1977
	{
1978 1979 1980 1981 1982 1983 1984 1985
	  if (!strcmp(item_field->table_name,table_name) &&
	      (!db_name || (db_name && item_field->db_name &&
			    !strcmp(item_field->table_name,table_name))))
	  {
	    found= li.ref();
	    *counter= i;
	    break;
	  }
unknown's avatar
unknown committed
1986 1987 1988
	}
      }
    }
1989
    else if (!table_name && (item->eq(find,0) ||
1990
			     find->name && item->name &&
1991 1992
			     !my_strcasecmp(system_charset_info, 
					    item->name,find->name)))
unknown's avatar
unknown committed
1993
    {
1994 1995
      found= li.ref();
      *counter= i;
unknown's avatar
unknown committed
1996 1997 1998
      break;
    }
  }
1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
  if (found)
    return found;
  else if (report_error != REPORT_EXCEPT_NOT_FOUND)
  {
    if (report_error == REPORT_ALL_ERRORS)
      my_printf_error(ER_BAD_FIELD_ERROR, ER(ER_BAD_FIELD_ERROR), MYF(0),
		      find->full_name(), current_thd->where);
    return (Item **) 0;
  }
  else
    return (Item **) not_found_item;
unknown's avatar
unknown committed
2010 2011 2012
}

/****************************************************************************
2013
** Expand all '*' in given fields
unknown's avatar
unknown committed
2014 2015
****************************************************************************/

2016 2017 2018
int setup_wild(THD *thd, TABLE_LIST *tables, List<Item> &fields,
	       List<Item> *sum_func_list,
	       uint wild_num)
unknown's avatar
unknown committed
2019
{
2020 2021
  if (!wild_num)
    return 0;
unknown's avatar
unknown committed
2022 2023
  reg2 Item *item;
  List_iterator<Item> it(fields);
2024 2025
  while ( wild_num && (item= it++))
  {    
unknown's avatar
unknown committed
2026
    if (item->type() == Item::FIELD_ITEM && ((Item_field*) item)->field_name &&
2027 2028
	((Item_field*) item)->field_name[0] == '*' &&
	!((Item_field*) item)->field)
2029
    {
2030
      uint elem= fields.elements;
2031
      if (insert_fields(thd,tables,((Item_field*) item)->db_name,
2032
			((Item_field*) item)->table_name, &it))
2033
	return (-1);
2034
      if (sum_func_list)
2035 2036 2037 2038 2039 2040 2041 2042
      {
	/*
	  sum_func_list is a list that has the fields list as a tail.
	  Because of this we have to update the element count also for this
	  list after expanding the '*' entry.
	*/
	sum_func_list->elements+= fields.elements - elem;
      }
2043
      wild_num--;
2044 2045
    }
  }
2046
  return 0;
2047 2048
}

2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064
/****************************************************************************
** Check that all given fields exists and fill struct with current data
****************************************************************************/

int setup_fields(THD *thd, Item **ref_pointer_array, TABLE_LIST *tables, 
		 List<Item> &fields, bool set_query_id,
		 List<Item> *sum_func_list, bool allow_sum_func)
{
  reg2 Item *item;
  List_iterator<Item> it(fields);
  DBUG_ENTER("setup_fields");

  thd->set_query_id=set_query_id;
  thd->allow_sum_func= allow_sum_func;
  thd->where="field list";

unknown's avatar
unknown committed
2065 2066
  Item **ref= ref_pointer_array;
  while ((item= it++))
2067
  {
unknown's avatar
unknown committed
2068 2069
    if (item->fix_fields(thd, tables, it.ref()) ||
	item->check_cols(1))
2070
      DBUG_RETURN(-1); /* purecov: inspected */
unknown's avatar
unknown committed
2071 2072 2073
    item= *(it.ref()); //Item can be changed in fix fields
    if (ref)
      *(ref++)= item;
2074 2075 2076 2077 2078
    if (item->with_sum_func && item->type() != Item::SUM_FUNC_ITEM &&
	sum_func_list)
      item->split_sum_func(ref_pointer_array, *sum_func_list);
    thd->used_tables|=item->used_tables();
  }
2079
  DBUG_RETURN(test(thd->net.report_error));
2080
}
2081

2082

2083
/*
2084
  prepare tables
2085

2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096 2097 2098 2099 2100 2101 2102
  SYNOPSIS
    setup_tables()
    tables - tables list
    reinit - true if called for table reinitialization before
             subquery reexecuting

   RETURN
     0	ok;  In this case *map will includes the choosed index
     1	error

   NOTE
     Remap table numbers if INSERT ... SELECT
     Check also that the 'used keys' and 'ignored keys' exists and set up the
     table structure accordingly

     This has to be called for all tables that are used by items, as otherwise
     table->map is not set and all Item_field will be regarded as const items.
2103 2104
*/

2105
bool setup_tables(TABLE_LIST *tables, my_bool reinit)
2106 2107
{
  DBUG_ENTER("setup_tables");
unknown's avatar
unknown committed
2108
  uint tablenr=0;
unknown's avatar
unknown committed
2109 2110
  for (TABLE_LIST *table_list=tables ; table_list ;
       table_list=table_list->next,tablenr++)
unknown's avatar
unknown committed
2111
  {
unknown's avatar
unknown committed
2112 2113
    TABLE *table= table_list->table;
    setup_table_map(table, table_list, tablenr);
2114
    table->used_keys= table->keys_for_keyread;
unknown's avatar
unknown committed
2115
    if (table_list->use_index)
unknown's avatar
unknown committed
2116
    {
2117 2118 2119
      key_map map;
      get_key_map_from_key_list(&map, table, table_list->use_index);
      if (map.is_set_all())
2120
	DBUG_RETURN(1);
unknown's avatar
unknown committed
2121
      table->keys_in_use_for_query=map;
unknown's avatar
unknown committed
2122
    }
unknown's avatar
unknown committed
2123
    if (table_list->ignore_index)
unknown's avatar
unknown committed
2124
    {
2125 2126 2127
      key_map map;
      get_key_map_from_key_list(&map, table, table_list->ignore_index);
      if (map.is_set_all())
2128
	DBUG_RETURN(1);
2129
      table->keys_in_use_for_query.subtract(map);
unknown's avatar
unknown committed
2130
    }
2131
    table->used_keys.intersect(table->keys_in_use_for_query);
2132
    if ((table_list->shared  || table->clear_query_id) && !reinit)
2133
    {
unknown's avatar
unknown committed
2134
      table->clear_query_id= 0;
2135 2136 2137 2138
      /* Clear query_id that may have been set by previous select */
      for (Field **ptr=table->field ; *ptr ; ptr++)
	(*ptr)->query_id=0;
    }
unknown's avatar
unknown committed
2139 2140 2141 2142
  }
  if (tablenr > MAX_TABLES)
  {
    my_error(ER_TOO_MANY_TABLES,MYF(0),MAX_TABLES);
2143
    DBUG_RETURN(1);
unknown's avatar
unknown committed
2144
  }
2145
  DBUG_RETURN(0);
unknown's avatar
unknown committed
2146
}
2147

unknown's avatar
unknown committed
2148

2149 2150 2151 2152 2153 2154 2155 2156 2157 2158 2159 2160 2161 2162 2163
/*
   Create a key_map from a list of index names

   SYNOPSIS
     get_key_map_from_key_list()
     map		key_map to fill in
     table		Table
     index_list		List of index names

   RETURN
     0	ok;  In this case *map will includes the choosed index
     1	error
*/

bool get_key_map_from_key_list(key_map *map, TABLE *table,
2164
                               List<String> *index_list)
unknown's avatar
unknown committed
2165
{
unknown's avatar
unknown committed
2166
  List_iterator_fast<String> it(*index_list);
unknown's avatar
unknown committed
2167 2168
  String *name;
  uint pos;
2169 2170

  map->clear_all();
unknown's avatar
unknown committed
2171 2172
  while ((name=it++))
  {
2173 2174
    if ((pos= find_type(&table->keynames, name->ptr(), name->length(), 1)) <=
	0)
unknown's avatar
unknown committed
2175 2176 2177
    {
      my_error(ER_KEY_COLUMN_DOES_NOT_EXITS, MYF(0), name->c_ptr(),
	       table->real_name);
2178
      map->set_all();
2179
      return 1;
unknown's avatar
unknown committed
2180
    }
2181
    map->set_bit(pos-1);
unknown's avatar
unknown committed
2182
  }
2183
  return 0;
unknown's avatar
unknown committed
2184 2185
}

2186

unknown's avatar
unknown committed
2187
/****************************************************************************
unknown's avatar
unknown committed
2188 2189
  This just drops in all fields instead of current '*' field
  Returns pointer to last inserted field if ok
unknown's avatar
unknown committed
2190 2191
****************************************************************************/

unknown's avatar
unknown committed
2192
bool
2193 2194
insert_fields(THD *thd,TABLE_LIST *tables, const char *db_name,
	      const char *table_name, List_iterator<Item> *it)
unknown's avatar
unknown committed
2195 2196 2197 2198 2199
{
  uint found;
  DBUG_ENTER("insert_fields");

  found=0;
2200
  for (; tables ; tables=tables->next)
unknown's avatar
unknown committed
2201
  {
2202
    TABLE *table=tables->table;
2203 2204
    if (!table_name || (!my_strcasecmp(table_alias_charset, table_name,
				       tables->alias) &&
2205
			(!db_name || !strcmp(tables->db,db_name))))
unknown's avatar
unknown committed
2206
    {
unknown's avatar
unknown committed
2207
#ifndef NO_EMBEDDED_ACCESS_CHECKS
unknown's avatar
unknown committed
2208
      /* Ensure that we have access right to all columns */
unknown's avatar
unknown committed
2209
      if (!(table->grant.privilege & SELECT_ACL) &&
2210
	  !tables->derived &&
unknown's avatar
unknown committed
2211
	  check_grant_all_columns(thd,SELECT_ACL,table))
unknown's avatar
unknown committed
2212
	DBUG_RETURN(-1);
unknown's avatar
unknown committed
2213
#endif
2214
      Field **ptr=table->field,*field;
unknown's avatar
unknown committed
2215
      thd->used_tables|=table->map;
unknown's avatar
unknown committed
2216 2217 2218 2219
      while ((field = *ptr++))
      {
	Item_field *item= new Item_field(field);
	if (!found++)
unknown's avatar
unknown committed
2220
	  (void) it->replace(item);		// Replace '*'
unknown's avatar
unknown committed
2221 2222
	else
	  it->after(item);
unknown's avatar
unknown committed
2223 2224 2225 2226
	/*
	  Mark if field used before in this select.
	  Used by 'insert' to verify if a field name is used twice
	*/
unknown's avatar
unknown committed
2227 2228 2229
	if (field->query_id == thd->query_id)
	  thd->dupp_field=field;
	field->query_id=thd->query_id;
2230
	table->used_keys.intersect(field->part_of_key);
unknown's avatar
unknown committed
2231 2232
      }
      /* All fields are used */
2233
      table->used_fields=table->fields;
unknown's avatar
unknown committed
2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 2248 2249 2250 2251 2252
    }
  }
  if (!found)
  {
    if (!table_name)
      my_error(ER_NO_TABLES_USED,MYF(0));
    else
      my_error(ER_BAD_TABLE_ERROR,MYF(0),table_name);
  }
  DBUG_RETURN(!found);
}


/*
** Fix all conditions and outer join expressions
*/

int setup_conds(THD *thd,TABLE_LIST *tables,COND **conds)
{
2253
  table_map not_null_tables= 0;
unknown's avatar
unknown committed
2254 2255
  DBUG_ENTER("setup_conds");
  thd->set_query_id=1;
2256
  
2257
  thd->lex->current_select->cond_count= 0;
unknown's avatar
unknown committed
2258 2259 2260
  if (*conds)
  {
    thd->where="where clause";
unknown's avatar
unknown committed
2261
    if ((*conds)->fix_fields(thd, tables, conds) || (*conds)->check_cols(1))
unknown's avatar
unknown committed
2262
      DBUG_RETURN(1);
2263
    not_null_tables= (*conds)->not_null_tables();
unknown's avatar
unknown committed
2264 2265 2266 2267 2268
  }

  /* Check if we are using outer joins */
  for (TABLE_LIST *table=tables ; table ; table=table->next)
  {
2269 2270 2271 2272
    if (table->on_expr)
    {
      /* Make a join an a expression */
      thd->where="on clause";
unknown's avatar
unknown committed
2273 2274
      if (table->on_expr->fix_fields(thd, tables, &table->on_expr) ||
	  table->on_expr->check_cols(1))
2275
	DBUG_RETURN(1);
2276
      thd->lex->current_select->cond_count++;
2277

2278 2279 2280 2281 2282 2283 2284
      /*
	If it's a normal join or a LEFT JOIN which can be optimized away
	add the ON/USING expression to the WHERE
      */
      if (!table->outer_join ||
	  ((table->table->map & not_null_tables) &&
	   !(specialflag & SPECIAL_NO_NEW_FUNC)))
2285
      {
2286
	table->outer_join= 0;
2287 2288 2289 2290 2291
	if (!(*conds=and_conds(*conds, table->on_expr)))
	  DBUG_RETURN(1);
	table->on_expr=0;
      }
    }
unknown's avatar
unknown committed
2292 2293 2294 2295 2296 2297 2298 2299
    if (table->natural_join)
    {
      /* Make a join of all fields with have the same name */
      TABLE *t1=table->table;
      TABLE *t2=table->natural_join->table;
      Item_cond_and *cond_and=new Item_cond_and();
      if (!cond_and)				// If not out of memory
	DBUG_RETURN(1);
2300
      cond_and->top_level_item();
unknown's avatar
unknown committed
2301 2302 2303 2304 2305 2306 2307

      uint i,j;
      for (i=0 ; i < t1->fields ; i++)
      {
	// TODO: This could be optimized to use hashed names if t2 had a hash
	for (j=0 ; j < t2->fields ; j++)
	{
2308 2309
	  if (!my_strcasecmp(system_charset_info,
			     t1->field[i]->field_name,
unknown's avatar
unknown committed
2310 2311 2312 2313 2314 2315 2316 2317
			     t2->field[j]->field_name))
	  {
	    Item_func_eq *tmp=new Item_func_eq(new Item_field(t1->field[i]),
					       new Item_field(t2->field[j]));
	    if (!tmp)
	      DBUG_RETURN(1);
	    tmp->fix_length_and_dec();	// Update cmp_type
	    tmp->const_item_cache=0;
2318 2319
	    /* Mark field used for table cache */
	    t1->field[i]->query_id=t2->field[j]->query_id=thd->query_id;
unknown's avatar
unknown committed
2320
	    cond_and->list.push_back(tmp);
2321 2322
	    t1->used_keys.intersect(t1->field[i]->part_of_key);
	    t2->used_keys.intersect(t2->field[j]->part_of_key);
unknown's avatar
unknown committed
2323 2324 2325 2326 2327
	    break;
	  }
	}
      }
      cond_and->used_tables_cache= t1->map | t2->map;
2328
      thd->lex->current_select->cond_count+= cond_and->list.elements;
unknown's avatar
unknown committed
2329 2330 2331 2332 2333 2334
      if (!table->outer_join)			// Not left join
      {
	if (!(*conds=and_conds(*conds, cond_and)))
	  DBUG_RETURN(1);
      }
      else
2335
	table->on_expr=and_conds(table->on_expr,cond_and);
unknown's avatar
unknown committed
2336 2337
    }
  }
2338
  DBUG_RETURN(test(thd->net.report_error));
unknown's avatar
unknown committed
2339 2340 2341 2342 2343 2344 2345 2346 2347
}


/******************************************************************************
** Fill a record with data (for INSERT or UPDATE)
** Returns : 1 if some field has wrong type
******************************************************************************/

int
2348
fill_record(List<Item> &fields,List<Item> &values, bool ignore_errors)
unknown's avatar
unknown committed
2349
{
unknown's avatar
unknown committed
2350
  List_iterator_fast<Item> f(fields),v(values);
unknown's avatar
unknown committed
2351 2352 2353 2354 2355 2356 2357
  Item *value;
  Item_field *field;
  DBUG_ENTER("fill_record");

  while ((field=(Item_field*) f++))
  {
    value=v++;
2358 2359
    Field *rfield= field->field;
    TABLE *table= rfield->table;
unknown's avatar
unknown committed
2360 2361
    if (rfield == table->next_number_field)
      table->auto_increment_field_not_null= true;
2362
    if (value->save_in_field(rfield, 0) > 0 && !ignore_errors)
unknown's avatar
unknown committed
2363 2364 2365 2366 2367 2368 2369
      DBUG_RETURN(1);
  }
  DBUG_RETURN(0);
}


int
2370
fill_record(Field **ptr,List<Item> &values, bool ignore_errors)
unknown's avatar
unknown committed
2371
{
unknown's avatar
unknown committed
2372
  List_iterator_fast<Item> v(values);
unknown's avatar
unknown committed
2373 2374 2375 2376 2377 2378 2379
  Item *value;
  DBUG_ENTER("fill_record");

  Field *field;
  while ((field = *ptr++))
  {
    value=v++;
2380
    TABLE *table= field->table;
unknown's avatar
unknown committed
2381 2382
    if (field == table->next_number_field)
      table->auto_increment_field_not_null= true;
unknown's avatar
unknown committed
2383
    if (value->save_in_field(field, 0) == 1 && !ignore_errors)
unknown's avatar
unknown committed
2384 2385 2386 2387 2388 2389 2390 2391
      DBUG_RETURN(1);
  }
  DBUG_RETURN(0);
}


static void mysql_rm_tmp_tables(void)
{
unknown's avatar
unknown committed
2392 2393
  uint i, idx;
  char	filePath[FN_REFLEN], *tmpdir;
unknown's avatar
unknown committed
2394 2395 2396 2397
  MY_DIR *dirp;
  FILEINFO *file;
  DBUG_ENTER("mysql_rm_tmp_tables");

unknown's avatar
unknown committed
2398 2399 2400
  for (i=0; i<=mysql_tmpdir_list.max; i++)
  {
    tmpdir=mysql_tmpdir_list.list[i];
unknown's avatar
unknown committed
2401
  /* See if the directory exists */
unknown's avatar
unknown committed
2402 2403
    if (!(dirp = my_dir(tmpdir,MYF(MY_WME | MY_DONT_SORT))))
      continue;
unknown's avatar
unknown committed
2404

unknown's avatar
unknown committed
2405
    /* Remove all SQLxxx tables from directory */
unknown's avatar
unknown committed
2406 2407 2408 2409 2410 2411

  for (idx=2 ; idx < (uint) dirp->number_off_files ; idx++)
  {
    file=dirp->dir_entry+idx;
    if (!bcmp(file->name,tmp_file_prefix,tmp_file_prefix_length))
    {
unknown's avatar
unknown committed
2412 2413
        sprintf(filePath,"%s%s",tmpdir,file->name);
        VOID(my_delete(filePath,MYF(MY_WME)));
unknown's avatar
unknown committed
2414 2415 2416
    }
  }
  my_dirend(dirp);
unknown's avatar
unknown committed
2417
  }
unknown's avatar
unknown committed
2418 2419 2420 2421 2422
  DBUG_VOID_RETURN;
}


/*
unknown's avatar
unknown committed
2423 2424 2425 2426
  CREATE INDEX and DROP INDEX are implemented by calling ALTER TABLE with
  the proper arguments.  This isn't very fast but it should work for most
  cases.
  One should normally create all indexes with CREATE TABLE or ALTER TABLE.
unknown's avatar
unknown committed
2427 2428 2429 2430 2431 2432 2433 2434 2435 2436 2437
*/

int mysql_create_index(THD *thd, TABLE_LIST *table_list, List<Key> &keys)
{
  List<create_field> fields;
  List<Alter_drop> drop;
  List<Alter_column> alter;
  HA_CREATE_INFO create_info;
  DBUG_ENTER("mysql_create_index");
  bzero((char*) &create_info,sizeof(create_info));
  create_info.db_type=DB_TYPE_DEFAULT;
2438
  create_info.default_table_charset= thd->variables.collation_database;
unknown's avatar
unknown committed
2439 2440
  DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->real_name,
				&create_info, table_list,
2441
				fields, keys, drop, alter, 0, (ORDER*)0,
2442
				DUP_ERROR));
unknown's avatar
unknown committed
2443 2444 2445 2446 2447 2448 2449 2450 2451 2452 2453 2454
}


int mysql_drop_index(THD *thd, TABLE_LIST *table_list, List<Alter_drop> &drop)
{
  List<create_field> fields;
  List<Key> keys;
  List<Alter_column> alter;
  HA_CREATE_INFO create_info;
  DBUG_ENTER("mysql_drop_index");
  bzero((char*) &create_info,sizeof(create_info));
  create_info.db_type=DB_TYPE_DEFAULT;
2455
  create_info.default_table_charset= thd->variables.collation_database;
unknown's avatar
unknown committed
2456 2457
  DBUG_RETURN(mysql_alter_table(thd,table_list->db,table_list->real_name,
				&create_info, table_list,
2458
				fields, keys, drop, alter, 0, (ORDER*)0,
2459
				DUP_ERROR));
unknown's avatar
unknown committed
2460 2461 2462 2463 2464 2465 2466 2467 2468 2469 2470 2471 2472 2473 2474 2475 2476 2477 2478 2479 2480 2481 2482 2483 2484 2485 2486 2487 2488 2489 2490 2491 2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 2503 2504 2505 2506
}

/*****************************************************************************
	unireg support functions
*****************************************************************************/

/*
** Invalidate any cache entries that are for some DB
** We can't use hash_delete when looping hash_elements. We mark them first
** and afterwards delete those marked unused.
*/

void remove_db_from_cache(const my_string db)
{
  for (uint idx=0 ; idx < open_cache.records ; idx++)
  {
    TABLE *table=(TABLE*) hash_element(&open_cache,idx);
    if (!strcmp(table->table_cache_key,db))
    {
      table->version=0L;			/* Free when thread is ready */
      if (!table->in_use)
	relink_unused(table);
    }
  }
  while (unused_tables && !unused_tables->version)
    VOID(hash_delete(&open_cache,(byte*) unused_tables));
}


/*
** free all unused tables
*/

void flush_tables()
{
  (void) pthread_mutex_lock(&LOCK_open);
  while (unused_tables)
    hash_delete(&open_cache,(byte*) unused_tables);
  (void) pthread_mutex_unlock(&LOCK_open);
}


/*
** Mark all entries with the table as deleted to force an reopen of the table
** Returns true if the table is in use by another thread
*/

2507 2508
bool remove_table_from_cache(THD *thd, const char *db, const char *table_name,
			     bool return_if_owned_by_thd)
unknown's avatar
unknown committed
2509 2510 2511 2512 2513 2514 2515 2516 2517 2518 2519 2520
{
  char key[MAX_DBKEY_LENGTH];
  uint key_length;
  TABLE *table;
  bool result=0;
  DBUG_ENTER("remove_table_from_cache");

  key_length=(uint) (strmov(strmov(key,db)+1,table_name)-key)+1;
  for (table=(TABLE*) hash_search(&open_cache,(byte*) key,key_length) ;
       table;
       table = (TABLE*) hash_next(&open_cache,(byte*) key,key_length))
  {
2521
    THD *in_use;
unknown's avatar
unknown committed
2522
    table->version=0L;			/* Free when thread is ready */
2523
    if (!(in_use=table->in_use))
unknown's avatar
unknown committed
2524 2525
    {
      DBUG_PRINT("info",("Table was not in use"));
unknown's avatar
unknown committed
2526
      relink_unused(table);
unknown's avatar
unknown committed
2527
    }
2528
    else if (in_use != thd)
unknown's avatar
unknown committed
2529 2530 2531 2532 2533 2534 2535 2536 2537
    {
      in_use->some_tables_deleted=1;
      if (table->db_stat)
	result=1;
      /* Kill delayed insert threads */
      if (in_use->system_thread && ! in_use->killed)
      {
	in_use->killed=1;
	pthread_mutex_lock(&in_use->mysys_var->mutex);
unknown's avatar
unknown committed
2538
	if (in_use->mysys_var->current_cond)
unknown's avatar
unknown committed
2539 2540 2541 2542 2543 2544 2545
	{
	  pthread_mutex_lock(in_use->mysys_var->current_mutex);
	  pthread_cond_broadcast(in_use->mysys_var->current_cond);
	  pthread_mutex_unlock(in_use->mysys_var->current_mutex);
	}
	pthread_mutex_unlock(&in_use->mysys_var->mutex);
      }
2546 2547 2548 2549 2550 2551 2552 2553 2554 2555 2556
      /*
	Now we must abort all tables locks used by this thread
	as the thread may be waiting to get a lock for another table
      */
      for (TABLE *thd_table= in_use->open_tables;
	   thd_table ;
	   thd_table= thd_table->next)
      {
	if (thd_table->db_stat)			// If table is open
	  mysql_lock_abort_for_thread(thd, thd_table);
      }
unknown's avatar
unknown committed
2557
    }
2558 2559
    else
      result= result || return_if_owned_by_thd;
unknown's avatar
unknown committed
2560 2561 2562 2563 2564 2565
  }
  while (unused_tables && !unused_tables->version)
    VOID(hash_delete(&open_cache,(byte*) unused_tables));
  DBUG_RETURN(result);
}

2566
int setup_ftfuncs(SELECT_LEX *select_lex)
unknown's avatar
unknown committed
2567
{
2568 2569
  List_iterator<Item_func_match> li(*(select_lex->ftfunc_list)),
                                 lj(*(select_lex->ftfunc_list));
2570
  Item_func_match *ftf, *ftf2;
unknown's avatar
unknown committed
2571 2572

  while ((ftf=li++))
2573
  {
unknown's avatar
unknown committed
2574 2575
    if (ftf->fix_index())
      return 1;
2576 2577
    lj.rewind();
    while ((ftf2=lj++) != ftf)
2578
    {
2579
      if (ftf->eq(ftf2,1) && !ftf2->master)
2580 2581 2582
        ftf2->master=ftf;
    }
  }
unknown's avatar
unknown committed
2583 2584 2585

  return 0;
}
2586

2587

2588
int init_ftfuncs(THD *thd, SELECT_LEX *select_lex, bool no_order)
2589
{
2590
  if (select_lex->ftfunc_list->elements)
2591
  {
2592
    List_iterator<Item_func_match> li(*(select_lex->ftfunc_list));
unknown's avatar
unknown committed
2593 2594 2595
    Item_func_match *ifm;
    DBUG_PRINT("info",("Performing FULLTEXT search"));
    thd->proc_info="FULLTEXT initialization";
2596

unknown's avatar
unknown committed
2597 2598 2599
    while ((ifm=li++))
      ifm->init_search(no_order);
  }
2600 2601
  return 0;
}