hp_update.c
上传用户:romrleung
上传日期:2022-05-23
资源大小:18897k
文件大小:3k
- /* Copyright (C) 2000 MySQL AB & MySQL Finland AB & TCX DataKonsult AB
- 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; either version 2 of the License, or
- (at your option) any later version.
- 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
- /* Update current record in heap-database */
- #include "heapdef.h"
- int heap_update(HP_INFO *info, const byte *old, const byte *heap_new)
- {
- HP_KEYDEF *keydef, *end, *p_lastinx;
- byte *pos;
- bool auto_key_changed= 0;
- HP_SHARE *share= info->s;
- DBUG_ENTER("heap_update");
- test_active(info);
- pos=info->current_ptr;
- if (info->opt_flag & READ_CHECK_USED && hp_rectest(info,old))
- DBUG_RETURN(my_errno); /* Record changed */
- if (--(share->records) < share->blength >> 1) share->blength>>= 1;
- share->changed=1;
- p_lastinx= share->keydef + info->lastinx;
- for (keydef= share->keydef, end= keydef + share->keys; keydef < end; keydef++)
- {
- if (hp_rec_key_cmp(keydef, old, heap_new))
- {
- if ((*keydef->delete_key)(info, keydef, old, pos, keydef == p_lastinx) ||
- (*keydef->write_key)(info, keydef, heap_new, pos))
- goto err;
- if (share->auto_key == (uint) (keydef - share->keydef + 1))
- auto_key_changed= 1;
- }
- }
- memcpy(pos,heap_new,(size_t) share->reclength);
- if (++(share->records) == share->blength) share->blength+= share->blength;
- #if !defined(DBUG_OFF) && defined(EXTRA_HEAP_DEBUG)
- DBUG_EXECUTE("check_heap",heap_check_heap(info, 0););
- #endif
- if (auto_key_changed)
- heap_update_auto_increment(info, heap_new);
- DBUG_RETURN(0);
- err:
- if (my_errno == HA_ERR_FOUND_DUPP_KEY)
- {
- info->errkey = keydef - share->keydef;
- if (keydef->algorithm == HA_KEY_ALG_BTREE)
- {
- /* we don't need to delete non-inserted key from rb-tree */
- if ((*keydef->write_key)(info, keydef, old, pos))
- {
- if (++(share->records) == share->blength)
- share->blength+= share->blength;
- DBUG_RETURN(my_errno);
- }
- keydef--;
- }
- while (keydef >= share->keydef)
- {
- if (hp_rec_key_cmp(keydef, old, heap_new))
- {
- if ((*keydef->delete_key)(info, keydef, heap_new, pos, 0) ||
- (*keydef->write_key)(info, keydef, old, pos))
- break;
- }
- keydef--;
- }
- }
- if (++(share->records) == share->blength)
- share->blength+= share->blength;
- DBUG_RETURN(my_errno);
- } /* heap_update */