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60 lines
2 KiB
C
60 lines
2 KiB
C
/* Copyright (c) 2000-2002, 2004-2007 MySQL AB
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Use is subject to license terms
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
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/* Read a record with random-access. The position to the record must
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get by MI_INFO. The next record can be read with pos= MI_POS_ERROR */
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#include "myisamdef.h"
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/*
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Read a row based on position.
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If filepos= HA_OFFSET_ERROR then read next row
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Return values
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Returns one of following values:
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0 = Ok.
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HA_ERR_RECORD_DELETED = Record is deleted.
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HA_ERR_END_OF_FILE = EOF.
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*/
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int mi_rrnd(MI_INFO *info, uchar *buf, register my_off_t filepos)
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{
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my_bool skip_deleted_blocks;
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DBUG_ENTER("mi_rrnd");
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skip_deleted_blocks=0;
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if (filepos == HA_OFFSET_ERROR)
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{
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skip_deleted_blocks=1;
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if (info->lastpos == HA_OFFSET_ERROR) /* First read ? */
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filepos= info->s->pack.header_length; /* Read first record */
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else
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filepos= info->nextpos;
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}
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if (info->once_flags & RRND_PRESERVE_LASTINX)
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info->once_flags&= ~RRND_PRESERVE_LASTINX;
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else
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info->lastinx= -1; /* Can't forward or backward */
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/* Init all but update-flag */
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info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);
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if (info->opt_flag & WRITE_CACHE_USED && flush_io_cache(&info->rec_cache))
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DBUG_RETURN(my_errno);
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DBUG_RETURN ((*info->s->read_rnd)(info,buf,filepos,skip_deleted_blocks));
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}
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