myrg_rlast.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 */
- #include "myrg_def.h"
- /* Read last row with the same key as the previous read. */
- int myrg_rlast(MYRG_INFO *info, byte *buf, int inx)
- {
- MYRG_TABLE *table;
- MI_INFO *mi;
- int err;
- if (_myrg_init_queue(info,inx, HA_READ_KEY_OR_PREV))
- return my_errno;
- for (table=info->open_tables ; table < info->end_table ; table++)
- {
- if ((err=mi_rlast(table->table,NULL,inx)))
- {
- if (err == HA_ERR_END_OF_FILE)
- continue;
- return err;
- }
- /* adding to queue */
- queue_insert(&(info->by_key),(byte *)table);
- }
- /* We have done a read in all tables */
- info->last_used_table=table;
- if (!info->by_key.elements)
- return HA_ERR_END_OF_FILE;
- mi=(info->current_table=(MYRG_TABLE *)queue_top(&(info->by_key)))->table;
- return _myrg_mi_read_record(mi,buf);
- }