release/src/router/mysql/storage/myisam/mi_rsame.c

   1 /* Copyright (c) 2000, 2001, 2005-2007 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 #include "myisamdef.h"
  17
  18         /*
  19         ** Find current row with read on position or read on key
  20         ** If inx >= 0 find record using key
  21         ** Return values:
  22         ** 0 = Ok.
  23         ** HA_ERR_KEY_NOT_FOUND = Row is deleted
  24         ** HA_ERR_END_OF_FILE   = End of file
  25         */
  26
  27
  28 int mi_rsame(MI_INFO *info, uchar *record, int inx)
  29 {
  30   DBUG_ENTER("mi_rsame");
  31
  32   if (inx != -1 && ! mi_is_key_active(info->s->state.key_map, inx))
  33   {
  34     DBUG_RETURN(my_errno=HA_ERR_WRONG_INDEX);
  35   }
  36   if (info->lastpos == HA_OFFSET_ERROR || info->update & HA_STATE_DELETED)
  37   {
  38     DBUG_RETURN(my_errno=HA_ERR_KEY_NOT_FOUND); /* No current record */
  39   }
  40   info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);
  41
  42   /* Read row from data file */
  43   if (fast_mi_readinfo(info))
  44     DBUG_RETURN(my_errno);
  45
  46   if (inx >= 0)
  47   {
  48     info->lastinx=inx;
  49     info->lastkey_length=_mi_make_key(info,(uint) inx,info->lastkey,record,
  50                                       info->lastpos);
  51     if (info->s->concurrent_insert)
  52       rw_rdlock(&info->s->key_root_lock[inx]);
  53     VOID(_mi_search(info,info->s->keyinfo+inx,info->lastkey, USE_WHOLE_KEY,
  54                     SEARCH_SAME,
  55                     info->s->state.key_root[inx]));
  56     if (info->s->concurrent_insert)
  57       rw_unlock(&info->s->key_root_lock[inx]);
  58   }
  59
  60   if (!(*info->read_record)(info,info->lastpos,record))
  61     DBUG_RETURN(0);
  62   if (my_errno == HA_ERR_RECORD_DELETED)
  63     my_errno=HA_ERR_KEY_NOT_FOUND;
  64   DBUG_RETURN(my_errno);
  65 } /* mi_rsame */