sql_class.cc 16.4 KB
Newer Older
unknown's avatar
unknown committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
   
   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.
   
   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.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA */


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

#ifdef __GNUC__
#pragma implementation				// gcc: Class implementation
#endif

#include "mysql_priv.h"
#include "sql_acl.h"
#include <m_ctype.h>
#include <sys/stat.h>
33
#include <thr_alarm.h>
unknown's avatar
unknown committed
34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77
#ifdef	__WIN__
#include <io.h>
#endif

/*****************************************************************************
** Instansiate templates
*****************************************************************************/

#ifdef __GNUC__
/* Used templates */
template class List<Key>;
template class List_iterator<Key>;
template class List<key_part_spec>;
template class List_iterator<key_part_spec>;
template class List<Alter_drop>;
template class List_iterator<Alter_drop>;
template class List<Alter_column>;
template class List_iterator<Alter_column>;
#endif

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

static byte* get_var_key(user_var_entry *entry, uint *length,
			 my_bool not_used __attribute__((unused)))
{
  *length=(uint) entry->name.length;
  return (byte*) entry->name.str;
}

static void free_var(user_var_entry *entry)
{
  char *pos= (char*) entry+ALIGN_SIZE(sizeof(*entry));
  if (entry->value && entry->value != pos)
    my_free(entry->value, MYF(0));
  my_free((char*) entry,MYF(0));
}


/****************************************************************************
** Thread specific functions
****************************************************************************/

unknown's avatar
unknown committed
78
THD::THD():user_time(0),fatal_error(0),last_insert_id_used(0),
unknown's avatar
unknown committed
79 80
	   insert_id_used(0),in_lock_tables(0),
	   global_read_lock(0),bootstrap(0)
unknown's avatar
unknown committed
81
{
82
  host=user=priv_user=db=query=ip=0;
unknown's avatar
unknown committed
83
  locked=killed=count_cuted_fields=some_tables_deleted=no_errors=password=
unknown's avatar
unknown committed
84
    query_start_used=0;
unknown's avatar
unknown committed
85 86 87 88 89 90
  query_length=col_access=0;
  query_error=0;
  next_insert_id=last_insert_id=0;
  open_tables=temporary_tables=0;
  tmp_table=0;
  lock=locked_tables=0;
91
  used_tables=0;
unknown's avatar
unknown committed
92
  gemini_spin_retries=0;
93
  cuted_fields=sent_row_count=0L;
unknown's avatar
unknown committed
94
  start_time=(time_t) 0;
unknown's avatar
unknown committed
95
  current_linfo =  0;
96
  slave_thread = 0;
97
  slave_proxy_id = 0;
unknown's avatar
unknown committed
98
  last_nx_table = last_nx_db = 0;
unknown's avatar
unknown committed
99 100 101 102 103 104 105 106 107
  cond_count=0;
  convert_set=0;
  mysys_var=0;
  net.vio=0;
  ull=0;
  system_thread=0;
#ifdef	__WIN__
  real_id = 0;
#endif
108 109 110
#ifdef HAVE_GEMINI_DB
  bzero((char *)&gemini, sizeof(gemini));
#endif
unknown's avatar
unknown committed
111 112
#ifdef SIGNAL_WITH_VIO_CLOSE
  active_vio = 0;
113
  pthread_mutex_init(&active_vio_lock, MY_MUTEX_INIT_FAST);
unknown's avatar
unknown committed
114 115 116 117 118 119 120 121 122
#endif  

  /* Variables with default values */
  proc_info="login";
  where="field list";
  server_id = ::server_id;
  server_status=SERVER_STATUS_AUTOCOMMIT;
  update_lock_default= low_priority_updates ? TL_WRITE_LOW_PRIORITY : TL_WRITE;
  options=thd_startup_options;
unknown's avatar
unknown committed
123
  inactive_timeout=net_wait_timeout;
124
  open_options=ha_open_options;
unknown's avatar
unknown committed
125
  tx_isolation=session_tx_isolation=default_tx_isolation;
unknown's avatar
unknown committed
126 127 128 129 130 131
  command=COM_CONNECT;
  set_query_id=1;
  default_select_limit= HA_POS_ERROR;
  max_join_size=  ((::max_join_size != ~ (ulong) 0L) ? ::max_join_size :
		   HA_POS_ERROR);
  db_access=NO_ACCESS;
unknown's avatar
unknown committed
132 133 134

  /* Initialize sub structures */
  bzero((char*) &mem_root,sizeof(mem_root));
unknown's avatar
unknown committed
135 136 137
  hash_init(&user_vars, USER_VARS_HASH_SIZE, 0, 0,
	    (hash_get_key) get_var_key,
	    (void (*)(void*)) free_var,0);
138
#ifdef USING_TRANSACTIONS
139 140 141 142 143 144 145 146 147
  if (opt_using_transactions)
  {
    bzero((char*) &transaction,sizeof(transaction));
    if (open_cached_file(&transaction.trans_log,
			 mysql_tmpdir, LOG_PREFIX, binlog_cache_size,
			 MYF(MY_WME)))
      killed=1;
    transaction.trans_log.end_of_file= max_binlog_cache_size;
  }
148
#endif
unknown's avatar
unknown committed
149 150 151 152 153 154 155 156 157
}

THD::~THD()
{
  DBUG_ENTER("~THD()");
  /* Close connection */
  if (net.vio)
  {
    vio_delete(net.vio);
158
    net_end(&net); 
unknown's avatar
unknown committed
159 160 161 162 163 164 165 166
  }
  ha_rollback(this);
  if (locked_tables)
  {
    lock=locked_tables; locked_tables=0;
    close_thread_tables(this);
  }
  close_temporary_tables(this);
167
#ifdef USING_TRANSACTIONS
168 169 170 171 172
  if (opt_using_transactions)
  {
    close_cached_file(&transaction.trans_log);
    ha_close_connection(this);
  }
173
#endif
unknown's avatar
unknown committed
174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190
  if (global_read_lock)
  {
    pthread_mutex_lock(&LOCK_open);
    ::global_read_lock--;
    pthread_cond_broadcast(&COND_refresh);
    pthread_mutex_unlock(&LOCK_open);
  }
  if (ull)
  {
    pthread_mutex_lock(&LOCK_user_locks);
    item_user_lock_release(ull);
    pthread_mutex_unlock(&LOCK_user_locks);
  }
  hash_free(&user_vars);

  DBUG_PRINT("info", ("freeing host"));
  
191 192
  if (host != localhost)			// If not pointer to constant
    safeFree(host);
193 194
  if (user != delayed_user)
    safeFree(user);
unknown's avatar
unknown committed
195 196
  safeFree(db);
  safeFree(ip);
197
  free_root(&mem_root,MYF(0));
unknown's avatar
unknown committed
198
  mysys_var=0;					// Safety (shouldn't be needed)
199 200
#ifdef SIGNAL_WITH_VIO_CLOSE
  pthread_mutex_destroy(&active_vio_lock);
201
#endif  
unknown's avatar
unknown committed
202 203 204
  DBUG_VOID_RETURN;
}

205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226
void THD::prepare_to_die()
{
  thr_alarm_kill(real_id);
  killed = 1;
#ifdef SIGNAL_WITH_VIO_CLOSE
  close_active_vio();
#endif    
  if (mysys_var)
    {
      pthread_mutex_lock(&mysys_var->mutex);
      if (!system_thread)		// Don't abort locks
	mysys_var->abort=1;
      if (mysys_var->current_mutex)
	{
	  pthread_mutex_lock(mysys_var->current_mutex);
	  pthread_cond_broadcast(mysys_var->current_cond);
	  pthread_mutex_unlock(mysys_var->current_mutex);
	}
      pthread_mutex_unlock(&mysys_var->mutex);
    }
}

unknown's avatar
unknown committed
227 228 229 230 231 232
// remember the location of thread info, the structure needed for
// sql_alloc() and the structure for the net buffer

bool THD::store_globals()
{
  return (my_pthread_setspecific_ptr(THR_THD,  this) ||
233
	  my_pthread_setspecific_ptr(THR_MALLOC, &mem_root) ||
unknown's avatar
unknown committed
234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287
	  my_pthread_setspecific_ptr(THR_NET,  &net));
}

/*****************************************************************************
** Functions to provide a interface to select results
*****************************************************************************/

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

static String default_line_term("\n"),default_escaped("\\"),
	      default_field_term("\t");

sql_exchange::sql_exchange(char *name,bool flag)
  :file_name(name), opt_enclosed(0), dumpfile(flag), skip_lines(0)
{
  field_term= &default_field_term;
  enclosed=   line_start= &empty_string;
  line_term=  &default_line_term;
  escaped=    &default_escaped;
}

bool select_send::send_fields(List<Item> &list,uint flag)
{
  return ::send_fields(thd,list,flag);
}


/* Send data to client. Returns 0 if ok */

bool select_send::send_data(List<Item> &items)
{
  List_iterator<Item> li(items);
  String *packet= &thd->packet;
  DBUG_ENTER("send_data");

  if (thd->offset_limit)
  {						// using limit offset,count
    thd->offset_limit--;
    DBUG_RETURN(0);
  }
  packet->length(0);				// Reset packet
  Item *item;
  while ((item=li++))
  {
    if (item->send(packet))
    {
      packet->free();				// Free used
      my_error(ER_OUT_OF_RESOURCES,MYF(0));
      DBUG_RETURN(1);
    }
  }
288
  thd->sent_row_count++;
unknown's avatar
unknown committed
289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323
  bool error=my_net_write(&thd->net,(char*) packet->ptr(),packet->length());
  DBUG_RETURN(error);
}


void select_send::send_error(uint errcode,const char *err)
{
  ::send_error(&thd->net,errcode,err);
}

bool select_send::send_eof()
{
  /* Unlock tables before sending packet to gain some speed */
  if (thd->lock)
  {
    mysql_unlock_tables(thd, thd->lock); thd->lock=0;
  }
  ::send_eof(&thd->net);
  return 0;
}


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


select_export::~select_export()
{
  if (file >= 0)
  {					// This only happens in case of error
    (void) end_io_cache(&cache);
    (void) my_close(file,MYF(0));
    file= -1;
  }
324
  thd->sent_row_count=row_count;
unknown's avatar
unknown committed
325 326 327 328 329 330 331 332 333 334 335
}

int
select_export::prepare(List<Item> &list)
{
  char path[FN_REFLEN];
  uint option=4;
  bool blob_flag=0;
#ifdef DONT_ALLOW_FULL_LOAD_DATA_PATHS
  option|=1;					// Force use of db directory
#endif
unknown's avatar
unknown committed
336
  if ((uint) strlen(exchange->file_name) + NAME_LEN >= FN_REFLEN)
unknown's avatar
unknown committed
337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529
    strmake(path,exchange->file_name,FN_REFLEN-1);
  (void) fn_format(path,exchange->file_name, thd->db ? thd->db : "", "",
		   option);
  if (!access(path,F_OK))
  {
    my_error(ER_FILE_EXISTS_ERROR,MYF(0),exchange->file_name);
    return 1;
  }
  /* Create the file world readable */
  if ((file=my_create(path, 0666, O_WRONLY, MYF(MY_WME))) < 0)
    return 1;
#ifdef HAVE_FCHMOD
  (void) fchmod(file,0666);			// Because of umask()
#else
  (void) chmod(path,0666);
#endif
  if (init_io_cache(&cache,file,0L,WRITE_CACHE,0L,1,MYF(MY_WME)))
  {
    my_close(file,MYF(0));
    file= -1;
    return 1;
  }
  /* Check if there is any blobs in data */
  {
    List_iterator<Item> li(list);
    Item *item;
    while ((item=li++))
    {
      if (item->max_length >= MAX_BLOB_WIDTH)
      {
	blob_flag=1;
	break;
      }
    }
  }
  field_term_length=exchange->field_term->length();
  if (!exchange->line_term->length())
    exchange->line_term=exchange->field_term;	// Use this if it exists
  field_sep_char= (exchange->enclosed->length() ? (*exchange->enclosed)[0] :
		   field_term_length ? (*exchange->field_term)[0] : INT_MAX);
  escape_char=	(exchange->escaped->length() ? (*exchange->escaped)[0] : -1);
  line_sep_char= (exchange->line_term->length() ?
		  (*exchange->line_term)[0] : INT_MAX);
  if (!field_term_length)
    exchange->opt_enclosed=0;
  if (!exchange->enclosed->length())
    exchange->opt_enclosed=1;			// A little quicker loop
  fixed_row_size= (!field_term_length && !exchange->enclosed->length() &&
		   !blob_flag);
  return 0;
}


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

  DBUG_ENTER("send_data");
  char buff[MAX_FIELD_WIDTH],null_buff[2],space[MAX_FIELD_WIDTH];
  bool space_inited=0;
  String tmp(buff,sizeof(buff)),*res;
  tmp.length(0);

  if (thd->offset_limit)
  {						// using limit offset,count
    thd->offset_limit--;
    DBUG_RETURN(0);
  }
  row_count++;
  Item *item;
  char *buff_ptr=buff;
  uint used_length=0,items_left=items.elements;
  List_iterator<Item> li(items);

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

	for (start=pos=(char*) res->ptr(),end=pos+used_length ;
	     pos != end ;
	     pos++)
	{
#ifdef USE_MB
	  if (use_mb(default_charset_info))
	  {
	    int l;
	    if ((l=my_ismbchar(default_charset_info, pos, end)))
	    {
	      pos += l-1;
	      continue;
	    }
	  }
#endif
	  if ((int) *pos == escape_char || (int) *pos == field_sep_char ||
	      (int) *pos == line_sep_char || !*pos)
	  {
	    char tmp_buff[2];
	    tmp_buff[0]= escape_char;
	    tmp_buff[1]= *pos ? *pos : '0';
	    if (my_b_write(&cache,(byte*) start,(uint) (pos-start)) ||
		my_b_write(&cache,(byte*) tmp_buff,2))
	      goto err;
	    start=pos+1;
	  }
	}
	if (my_b_write(&cache,(byte*) start,(uint) (pos-start)))
	  goto err;
      }
      else if (my_b_write(&cache,(byte*) res->ptr(),used_length))
	goto err;
    }
    if (fixed_row_size)
    {						// Fill with space
      if (item->max_length > used_length)
      {
	/* QQ:  Fix by adding a my_b_fill() function */
	if (!space_inited)
	{
	  space_inited=1;
	  bfill(space,sizeof(space),' ');
	}
	uint length=item->max_length-used_length;
	for ( ; length > sizeof(space) ; length-=sizeof(space))
	{
	  if (my_b_write(&cache,(byte*) space,sizeof(space)))
	    goto err;
	}
	if (my_b_write(&cache,(byte*) space,length))
	  goto err;
      }
    }
    buff_ptr=buff;				// Place separators here
    if (res && (!exchange->opt_enclosed || result_type == STRING_RESULT))
    {
      memcpy(buff_ptr,exchange->enclosed->ptr(),exchange->enclosed->length());
      buff_ptr+=exchange->enclosed->length();
    }
    if (--items_left)
    {
      memcpy(buff_ptr,exchange->field_term->ptr(),field_term_length);
      buff_ptr+=field_term_length;
    }
    if (my_b_write(&cache,(byte*) buff,(uint) (buff_ptr-buff)))
      goto err;
  }
  if (my_b_write(&cache,(byte*) exchange->line_term->ptr(),
		 exchange->line_term->length()))
    goto err;
  DBUG_RETURN(0);
err:
  DBUG_RETURN(1);
}


void select_export::send_error(uint errcode,const char *err)
{
530 531 532 533
  ::send_error(&thd->net,errcode,err);
  (void) end_io_cache(&cache);
  (void) my_close(file,MYF(0));
  file= -1;
unknown's avatar
unknown committed
534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620
}


bool select_export::send_eof()
{
  int error=test(end_io_cache(&cache));
  if (my_close(file,MYF(MY_WME)))
    error=1;
  if (error)
    ::send_error(&thd->net);
  else
    ::send_ok(&thd->net,row_count);
  file= -1;
  return error;
}


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


select_dump::~select_dump()
{
  if (file >= 0)
  {					// This only happens in case of error
    (void) end_io_cache(&cache);
    (void) my_close(file,MYF(0));
    file= -1;
  }
}

int
select_dump::prepare(List<Item> &list __attribute__((unused)))
{
  uint option=4;
#ifdef DONT_ALLOW_FULL_LOAD_DATA_PATHS
  option|=1;					// Force use of db directory
#endif
  (void) fn_format(path,exchange->file_name, thd->db ? thd->db : "", "",
		   option);
  if (!access(path,F_OK))
  {
    my_error(ER_FILE_EXISTS_ERROR,MYF(0),exchange->file_name);
    return 1;
  }
  /* Create the file world readable */
  if ((file=my_create(path, 0666, O_WRONLY, MYF(MY_WME))) < 0)
    return 1;
#ifdef HAVE_FCHMOD
  (void) fchmod(file,0666);			// Because of umask()
#else
  (void) chmod(path,0666);
#endif
  if (init_io_cache(&cache,file,0L,WRITE_CACHE,0L,1,MYF(MY_WME)))
  {
    my_close(file,MYF(0));
    my_delete(path,MYF(0));
    file= -1;
    return 1;
  }
  return 0;
}


bool select_dump::send_data(List<Item> &items)
{
  List_iterator<Item> li(items);
  char buff[MAX_FIELD_WIDTH];
  String tmp(buff,sizeof(buff)),*res;
  tmp.length(0);
  Item *item;
  DBUG_ENTER("send_data");

  if (thd->offset_limit)
  {						// using limit offset,count
    thd->offset_limit--;
    DBUG_RETURN(0);
  }
  if (row_count++ > 1) 
  {
    my_error(ER_TOO_MANY_ROWS,MYF(0));
    goto err;
  }
  while ((item=li++))
  {
    res=item->str_result(&tmp);
621
    if (!res)					// If NULL
unknown's avatar
unknown committed
622
    {
623 624
      if (my_b_write(&cache,(byte*) "",1))
	goto err;
unknown's avatar
unknown committed
625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659
    }
    else if (my_b_write(&cache,(byte*) res->ptr(),res->length()))
    {
      my_error(ER_ERROR_ON_WRITE,MYF(0), path, my_errno);
      goto err;
    }
  }
  DBUG_RETURN(0);
err:
  DBUG_RETURN(1);
}


void select_dump::send_error(uint errcode,const char *err)
{
  ::send_error(&thd->net,errcode,err);
  (void) end_io_cache(&cache);
  (void) my_close(file,MYF(0));
  (void) my_delete(path,MYF(0));		// Delete file on error
  file= -1;
}


bool select_dump::send_eof()
{
  int error=test(end_io_cache(&cache));
  if (my_close(file,MYF(MY_WME)))
    error=1;
  if (error)
    ::send_error(&thd->net);
  else
    ::send_ok(&thd->net,row_count);
  file= -1;
  return error;
}