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5886090182
myisammrg/ |
Makefile.am |
mymrgdef.h | support for keys
myrg_open.c | &
myrg_queue.c | bugfixes
myrg_rfirst.c |
myrg_rkey.c |
myrg_rlast.c |
myrg_rnext.c |
myrg_rprev.c |
myrg_rrnd.c |
include/myisammrg.h | rkey/rnext/etc prototyped
sql/ |
ha_myisammrg.cc | support for keys
ha_myisammrg.h |
myisam/ |
mi_rkey.c | buf==NULL extension, _mi_rkey()
mi_rnext.c |
mi_rprev.c |
include/queues.h | reinit_queue() - same as init_queue, but w/o malloc
mysys/queues.c |
PART II: Miscellaneous
myisam/common_words | deleted (looks like I checked it in by mistake)
some files (like acconfig.h, Makefile.am, COPYING.LIB, etc)
| Change mode to -rw-r--r-- (by `chmod a-x ')
88 lines
2.9 KiB
C
88 lines
2.9 KiB
C
/* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
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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; either version 2 of the License, or
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(at your option) any later version.
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include "myisamdef.h"
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/*
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Read next row with the same key as previous read
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One may have done a write, update or delete of the previous row.
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NOTE! Even if one changes the previous row, the next read is done
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based on the position of the last used key!
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*/
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int mi_rnext(MI_INFO *info, byte *buf, int inx)
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{
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int error;
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uint flag;
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DBUG_ENTER("mi_rnext");
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if ((inx = _mi_check_index(info,inx)) < 0)
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DBUG_RETURN(my_errno);
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flag=SEARCH_BIGGER; /* Read next */
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if (info->lastpos == HA_OFFSET_ERROR && info->update & HA_STATE_PREV_FOUND)
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flag=0; /* Read first */
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if (_mi_readinfo(info,F_RDLCK,1))
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DBUG_RETURN(my_errno);
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if (info->s->concurrent_insert)
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rw_rdlock(&info->s->key_root_lock[inx]);
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if (!flag)
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error=_mi_search_first(info,info->s->keyinfo+inx,
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info->s->state.key_root[inx]);
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else if (_mi_test_if_changed(info) == 0)
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error=_mi_search_next(info,info->s->keyinfo+inx,info->lastkey,
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info->lastkey_length,flag,
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info->s->state.key_root[inx]);
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else
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error=_mi_search(info,info->s->keyinfo+inx,info->lastkey,
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info->lastkey_length,flag, info->s->state.key_root[inx]);
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if (!error)
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{
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while (info->lastpos >= info->state->data_file_length)
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{
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/* Skip rows that are inserted by other threads since we got a lock */
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if ((error=_mi_search_next(info,info->s->keyinfo+inx,info->lastkey,
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info->lastkey_length,
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flag,
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info->s->state.key_root[inx])))
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break;
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}
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}
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if (info->s->concurrent_insert)
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rw_unlock(&info->s->key_root_lock[inx]);
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/* Don't clear if database-changed */
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info->update&= (HA_STATE_CHANGED | HA_STATE_ROW_CHANGED);
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info->update|= HA_STATE_NEXT_FOUND;
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if (error)
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{
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if (my_errno == HA_ERR_KEY_NOT_FOUND)
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my_errno=HA_ERR_END_OF_FILE;
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}
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else if (!buf)
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{
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DBUG_RETURN(info->lastpos==HA_OFFSET_ERROR ? my_errno : 0);
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}
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else if (!(*info->read_record)(info,info->lastpos,buf))
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{
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info->update|= HA_STATE_AKTIV; /* Record is read */
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DBUG_RETURN(0);
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}
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DBUG_PRINT("error",("Got error: %d, errno: %d",error, my_errno));
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DBUG_RETURN(my_errno);
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} /* mi_rnext */
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