Drizzled Public API Documentation

mi_scan.cc
1 /* Copyright (C) 2000-2001 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 St, Fifth Floor, Boston, MA 02110-1301 USA */
15 
16 /* Read through all rows sequntially */
17 
18 #include "myisam_priv.h"
19 
20 int mi_scan_init(register MI_INFO *info)
21 {
22  info->nextpos=info->s->pack.header_length; /* Read first record */
23  info->lastinx= -1; /* Can't forward or backward */
24  if (info->opt_flag & WRITE_CACHE_USED && info->rec_cache.flush())
25  return(errno);
26  return(0);
27 }
28 
29 /*
30  Read a row based on position.
31  If filepos= HA_OFFSET_ERROR then read next row
32  Return values
33  Returns one of following values:
34  0 = Ok.
35  HA_ERR_END_OF_FILE = EOF.
36 */
37 
38 int mi_scan(MI_INFO *info, unsigned char *buf)
39 {
40  /* Init all but update-flag */
41  info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);
42  return((*info->s->read_rnd)(info,buf,info->nextpos,1));
43 }