mirror of
https://github.com/MariaDB/server.git
synced 2025-02-01 19:41:47 +01:00
0d01dd200f
Added key and file version numbers to MEMORY tables so that we can detect if someone has changed them between HANDLER calls. mysql-test/suite/handler/aria.result: Fixed result after test changes mysql-test/suite/handler/handler.inc: Changed test to use combined key to ensure rows are returned in a pre-determinated order. mysql-test/suite/handler/heap.result: New result mysql-test/suite/handler/heap.test: Added test for HANDLER + HEAP mysql-test/suite/handler/innodb.result: Fixed result after test changes mysql-test/suite/handler/myisam.result: Fixed result after test changes sql/sql_handler.cc: Fixed wrong parameter to ha_index_next_same() storage/heap/ha_heap.cc: Abort key scan if table has changed. Abort table scan if table has been recreated. storage/heap/ha_heap.h: Added support for HANDLER storage/heap/hp_clear.c: Increase version number so that we can notice changes if using HANDLER storage/heap/hp_delete.c: Increase key data version number on key changes. storage/heap/hp_rfirst.c: Remember version of key data Give error if using read-first on hash key. storage/heap/hp_rkey.c: Remember version of key data storage/heap/hp_rlast.c: Remember version of key data Give error if using read-last on hash key. storage/heap/hp_rnext.c: Fixed that we get next key from last search. storage/heap/hp_rprev.c: Fixed that we get previous key from last search. storage/heap/hp_scan.c: Remember version of key and file data storage/heap/hp_update.c: Increase key data version number on key changes. storage/heap/hp_write.c: Increase key data version number on key changes.
84 lines
2.5 KiB
C
84 lines
2.5 KiB
C
/* Copyright (C) 2000-2002 MySQL 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; 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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#include "heapdef.h"
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/* Read prev record for key */
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int heap_rprev(HP_INFO *info, uchar *record)
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{
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uchar *pos;
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HP_SHARE *share=info->s;
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HP_KEYDEF *keyinfo;
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DBUG_ENTER("heap_rprev");
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if (info->lastinx < 0)
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DBUG_RETURN(my_errno=HA_ERR_WRONG_INDEX);
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keyinfo = share->keydef + info->lastinx;
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if (keyinfo->algorithm == HA_KEY_ALG_BTREE)
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{
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heap_rb_param custom_arg;
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if (info->last_pos)
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pos = tree_search_next(&keyinfo->rb_tree, &info->last_pos,
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offsetof(TREE_ELEMENT, right),
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offsetof(TREE_ELEMENT, left));
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else
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{
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custom_arg.keyseg = keyinfo->seg;
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custom_arg.key_length = keyinfo->length;
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custom_arg.search_flag = SEARCH_SAME;
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info->last_find_flag= HA_READ_KEY_OR_PREV;
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pos = tree_search_key(&keyinfo->rb_tree, info->lastkey, info->parents,
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&info->last_pos, info->last_find_flag, &custom_arg);
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}
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if (pos)
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{
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memcpy(&pos, pos + (*keyinfo->get_key_length)(keyinfo, pos),
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sizeof(uchar*));
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info->current_ptr = pos;
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}
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else
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{
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my_errno = HA_ERR_KEY_NOT_FOUND;
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}
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}
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else
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{
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if (info->current_ptr || (info->update & HA_STATE_NEXT_FOUND))
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{
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if ((info->update & HA_STATE_DELETED))
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pos= hp_search(info, share->keydef + info->lastinx, info->lastkey, 3);
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else
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pos= hp_search(info, share->keydef + info->lastinx, info->lastkey, 2);
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}
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else
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{
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pos=0; /* Read next after last */
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my_errno=HA_ERR_KEY_NOT_FOUND;
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}
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}
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if (!pos)
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{
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info->update=HA_STATE_PREV_FOUND; /* For heap_rprev */
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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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DBUG_RETURN(my_errno);
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}
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memcpy(record,pos,(size_t) share->reclength);
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info->update=HA_STATE_AKTIV | HA_STATE_PREV_FOUND;
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DBUG_RETURN(0);
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}
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