release/src/router/mysql/storage/heap/hp_extra.c

   1 /* Copyright (c) 2000, 2004-2006 MySQL AB
   2
   3    This program is free software; you can redistribute it and/or modify
   4    it under the terms of the GNU General Public License as published by
   5    the Free Software Foundation; version 2 of the License.
   6
   7    This program is distributed in the hope that it will be useful,
   8    but WITHOUT ANY WARRANTY; without even the implied warranty of
   9    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10    GNU General Public License for more details.
  11
  12    You should have received a copy of the GNU General Public License
  13    along with this program; if not, write to the Free Software
  14    Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA */
  15
  16 /* Extra functions we want to do with a database */
  17 /* - Set flags for quicker databasehandler */
  18 /* - Set databasehandler to normal */
  19 /* - Reset recordpointers as after open database */
  20
  21 #include "heapdef.h"
  22
  23 static void heap_extra_keyflag(register HP_INFO *info,
  24                                enum ha_extra_function function);
  25
  26
  27         /* set extra flags for database */
  28
  29 int heap_extra(register HP_INFO *info, enum ha_extra_function function)
  30 {
  31   DBUG_ENTER("heap_extra");
  32
  33   switch (function) {
  34   case HA_EXTRA_RESET_STATE:
  35     heap_reset(info);
  36   case HA_EXTRA_NO_READCHECK:
  37     info->opt_flag&= ~READ_CHECK_USED;  /* No readcheck */
  38     break;
  39   case HA_EXTRA_READCHECK:
  40     info->opt_flag|= READ_CHECK_USED;
  41     break;
  42   case HA_EXTRA_CHANGE_KEY_TO_UNIQUE:
  43   case HA_EXTRA_CHANGE_KEY_TO_DUP:
  44     heap_extra_keyflag(info, function);
  45     break;
  46   default:
  47     break;
  48   }
  49   DBUG_RETURN(0);
  50 } /* heap_extra */
  51
  52
  53 int heap_reset(HP_INFO *info)
  54 {
  55   info->lastinx= -1;
  56   info->current_record= (ulong) ~0L;
  57   info->current_hash_ptr=0;
  58   info->update=0;
  59   info->next_block=0;
  60   return 0;
  61 }
  62
  63
  64 /*
  65     Start/Stop Inserting Duplicates Into a Table, WL#1648.
  66  */
  67 static void heap_extra_keyflag(register HP_INFO *info,
  68                                enum ha_extra_function function)
  69 {
  70   uint  idx;
  71
  72   for (idx= 0; idx< info->s->keys; idx++)
  73   {
  74     switch (function) {
  75     case HA_EXTRA_CHANGE_KEY_TO_UNIQUE:
  76       info->s->keydef[idx].flag|= HA_NOSAME;
  77       break;
  78     case HA_EXTRA_CHANGE_KEY_TO_DUP:
  79       info->s->keydef[idx].flag&= ~(HA_NOSAME);
  80       break;
  81     default:
  82       break;
  83     }
  84   }
  85 }