rsame.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 */
- /* L{ser nuvarande record med direktl{sning */
- /* Klarar b}de poster l{sta med nyckel och rrnd. */
- #include "isamdef.h"
- /* Funktionen ger som resultat:
- 0 = Ok.
- 1 = Posten borttagen
- -1 = EOF (eller motsvarande: se errno) */
- int nisam_rsame(N_INFO *info, byte *record, int inx)
- /* If inx >= 0 find record using key */
- {
- DBUG_ENTER("nisam_rsame");
- if (inx >= (int) info->s->state.keys || inx < -1)
- {
- my_errno=HA_ERR_WRONG_INDEX;
- DBUG_RETURN(-1);
- }
- if (info->lastpos == NI_POS_ERROR || info->update & HA_STATE_DELETED)
- {
- my_errno=HA_ERR_KEY_NOT_FOUND; /* No current record */
- DBUG_RETURN(-1);
- }
- info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);
- /* L{s record fr}n datafilen */
- #ifndef NO_LOCKING
- if (_nisam_readinfo(info,F_RDLCK,1))
- DBUG_RETURN(-1);
- #endif
- if (inx >= 0)
- {
- info->lastinx=inx;
- VOID(_nisam_make_key(info,(uint) inx,info->lastkey,record,info->lastpos));
- VOID(_nisam_search(info,info->s->keyinfo+inx,info->lastkey,0,SEARCH_SAME,
- info->s->state.key_root[inx]));
- }
- if ((*info->read_record)(info,info->lastpos,record) == 0)
- DBUG_RETURN(0);
- if (my_errno == HA_ERR_RECORD_DELETED)
- {
- my_errno=HA_ERR_KEY_NOT_FOUND;
- DBUG_RETURN(1);
- }
- DBUG_RETURN(-1);
- } /* nisam_rsame */