mirror of
https://github.com/MariaDB/server.git
synced 2025-10-31 02:46:29 +01:00
95 lines
3.1 KiB
C
95 lines
3.1 KiB
C
/* Copyright (c) 2000-2003, 2005-2008 MySQL AB, 2009 Sun Microsystems, Inc.
|
|
Use is subject to license terms.
|
|
|
|
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; version 2 of the License.
|
|
|
|
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
|
|
|
|
/* Read record based on a key */
|
|
|
|
/*
|
|
* HA_READ_KEY_EXACT => SEARCH_BIGGER
|
|
* HA_READ_KEY_OR_NEXT => SEARCH_BIGGER
|
|
* HA_READ_AFTER_KEY => SEARCH_BIGGER
|
|
* HA_READ_PREFIX => SEARCH_BIGGER
|
|
* HA_READ_KEY_OR_PREV => SEARCH_SMALLER
|
|
* HA_READ_BEFORE_KEY => SEARCH_SMALLER
|
|
* HA_READ_PREFIX_LAST => SEARCH_SMALLER
|
|
*/
|
|
|
|
|
|
#include "myrg_def.h"
|
|
|
|
/* todo: we could store some additional info to speedup lookups:
|
|
column (key, keyseg) can be constant per table
|
|
it can also be increasing (table1.val > table2.val > ...),
|
|
or decreasing, <=, >=, etc.
|
|
SerG
|
|
*/
|
|
|
|
int myrg_rkey(MYRG_INFO *info,uchar *buf,int inx, const uchar *key,
|
|
key_part_map keypart_map, enum ha_rkey_function search_flag)
|
|
{
|
|
uchar *UNINIT_VAR(key_buff);
|
|
uint UNINIT_VAR(pack_key_length);
|
|
uint16 UNINIT_VAR(last_used_keyseg);
|
|
MYRG_TABLE *table;
|
|
MI_INFO *mi;
|
|
int err;
|
|
DBUG_ENTER("myrg_rkey");
|
|
|
|
if (_myrg_init_queue(info,inx,search_flag))
|
|
DBUG_RETURN(my_errno);
|
|
|
|
for (table=info->open_tables ; table != info->end_table ; table++)
|
|
{
|
|
mi=table->table;
|
|
|
|
if (table == info->open_tables)
|
|
{
|
|
err=mi_rkey(mi, 0, inx, key, keypart_map, search_flag);
|
|
/* Get the saved packed key and packed key length. */
|
|
key_buff=(uchar*) mi->lastkey+mi->s->base.max_key_length;
|
|
pack_key_length=mi->pack_key_length;
|
|
last_used_keyseg= mi->last_used_keyseg;
|
|
}
|
|
else
|
|
{
|
|
mi->once_flags|= USE_PACKED_KEYS;
|
|
mi->last_used_keyseg= last_used_keyseg;
|
|
err=mi_rkey(mi, 0, inx, key_buff, pack_key_length, search_flag);
|
|
}
|
|
info->last_used_table=table+1;
|
|
|
|
if (err)
|
|
{
|
|
if (err == HA_ERR_KEY_NOT_FOUND)
|
|
continue;
|
|
DBUG_PRINT("exit", ("err: %d", err));
|
|
DBUG_RETURN(err);
|
|
}
|
|
/* adding to queue */
|
|
queue_insert(&(info->by_key),(uchar *)table);
|
|
|
|
}
|
|
|
|
DBUG_PRINT("info", ("tables with matches: %u", info->by_key.elements));
|
|
if (!info->by_key.elements)
|
|
DBUG_RETURN(HA_ERR_KEY_NOT_FOUND);
|
|
|
|
mi=(info->current_table=(MYRG_TABLE *)queue_top(&(info->by_key)))->table;
|
|
mi->once_flags|= RRND_PRESERVE_LASTINX;
|
|
DBUG_PRINT("info", ("using table no: %d",
|
|
(int) (info->current_table - info->open_tables + 1)));
|
|
DBUG_DUMP("result key", (uchar*) mi->lastkey, mi->lastkey_length);
|
|
DBUG_RETURN(_myrg_mi_read_record(mi,buf));
|
|
}
|