hp_rkey.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 */
- #include "heapdef.h"
- int heap_rkey(HP_INFO *info, byte *record, int inx, const byte *key,
- uint key_len, enum ha_rkey_function find_flag)
- {
- byte *pos;
- HP_SHARE *share= info->s;
- HP_KEYDEF *keyinfo= share->keydef + inx;
- DBUG_ENTER("heap_rkey");
- DBUG_PRINT("enter",("base: %lx inx: %d",info,inx));
- if ((uint) inx >= share->keys)
- {
- DBUG_RETURN(my_errno= HA_ERR_WRONG_INDEX);
- }
- info->lastinx= inx;
- info->current_record= (ulong) ~0L; /* For heap_rrnd() */
- if (keyinfo->algorithm == HA_KEY_ALG_BTREE)
- {
- heap_rb_param custom_arg;
- custom_arg.keyseg= info->s->keydef[inx].seg;
- custom_arg.key_length= info->lastkey_len=
- hp_rb_pack_key(keyinfo, (uchar*) info->lastkey,
- (uchar*) key, key_len);
- custom_arg.search_flag= SEARCH_FIND | SEARCH_SAME;
- /* for next rkey() after deletion */
- if (find_flag == HA_READ_AFTER_KEY)
- info->last_find_flag= HA_READ_KEY_OR_NEXT;
- else if (find_flag == HA_READ_BEFORE_KEY)
- info->last_find_flag= HA_READ_KEY_OR_PREV;
- else
- info->last_find_flag= find_flag;
- if (!(pos= tree_search_key(&keyinfo->rb_tree, info->lastkey, info->parents,
- &info->last_pos, find_flag, &custom_arg)))
- {
- info->update= 0;
- DBUG_RETURN(my_errno= HA_ERR_KEY_NOT_FOUND);
- }
- memcpy(&pos, pos + (*keyinfo->get_key_length)(keyinfo, pos), sizeof(byte*));
- info->current_ptr= pos;
- }
- else
- {
- if (!(pos= hp_search(info, share->keydef + inx, key, 0)))
- {
- info->update= 0;
- DBUG_RETURN(my_errno);
- }
- if (!(keyinfo->flag & HA_NOSAME))
- memcpy(info->lastkey, key, (size_t) keyinfo->length);
- }
- memcpy(record, pos, (size_t) share->reclength);
- info->update= HA_STATE_AKTIV;
- DBUG_RETURN(0);
- }
- /* Quick find of record */
- gptr heap_find(HP_INFO *info, int inx, const byte *key)
- {
- return hp_search(info, info->s->keydef + inx, key, 0);
- }