rsamepos.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:2k
- /* 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 */
- /* read record through position and fix key-position */
- /* As nisam_rsame but supply a position */
- #include "isamdef.h"
- /*
- ** If inx >= 0 update index pointer
- ** Returns one of the following values:
- ** 0 = Ok.
- ** 1 = Record deleted
- ** -1 = EOF (or something similar. More information in my_errno)
- */
- int nisam_rsame_with_pos(N_INFO *info, byte *record, int inx, ulong filepos)
- {
- DBUG_ENTER("nisam_rsame_with_pos");
- if (inx >= (int) info->s->state.keys || inx < -1)
- {
- my_errno=HA_ERR_WRONG_INDEX;
- DBUG_RETURN(-1);
- }
- info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);
- if ((*info->s->read_rnd)(info,record,filepos,0))
- {
- if (my_errno == HA_ERR_RECORD_DELETED)
- {
- my_errno=HA_ERR_KEY_NOT_FOUND;
- DBUG_RETURN(1);
- }
- DBUG_RETURN(-1);
- }
- info->lastpos=filepos;
- info->lastinx=inx;
- if (inx >= 0)
- {
- VOID(_nisam_make_key(info,(uint) inx,info->lastkey,record,info->lastpos));
- info->update|=HA_STATE_KEY_CHANGED; /* Don't use indexposition */
- }
- DBUG_RETURN(0);
- } /* nisam_rsame_pos */