Drizzled Public API Documentation

mi_scan.cc

00001 /* Copyright (C) 2000-2001 MySQL AB
00002 
00003    This program is free software; you can redistribute it and/or modify
00004    it under the terms of the GNU General Public License as published by
00005    the Free Software Foundation; version 2 of the License.
00006 
00007    This program is distributed in the hope that it will be useful,
00008    but WITHOUT ANY WARRANTY; without even the implied warranty of
00009    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00010    GNU General Public License for more details.
00011 
00012    You should have received a copy of the GNU General Public License
00013    along with this program; if not, write to the Free Software
00014    Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA */
00015 
00016 /* Read through all rows sequntially */
00017 
00018 #include "myisam_priv.h"
00019 
00020 int mi_scan_init(register MI_INFO *info)
00021 {
00022   info->nextpos=info->s->pack.header_length;  /* Read first record */
00023   info->lastinx= -1;        /* Can't forward or backward */
00024   if (info->opt_flag & WRITE_CACHE_USED && flush_io_cache(&info->rec_cache))
00025     return(errno);
00026   return(0);
00027 }
00028 
00029 /*
00030      Read a row based on position.
00031      If filepos= HA_OFFSET_ERROR then read next row
00032      Return values
00033      Returns one of following values:
00034      0 = Ok.
00035      HA_ERR_END_OF_FILE = EOF.
00036 */
00037 
00038 int mi_scan(MI_INFO *info, unsigned char *buf)
00039 {
00040   /* Init all but update-flag */
00041   info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);
00042   return((*info->s->read_rnd)(info,buf,info->nextpos,1));
00043 }