1 /* Copyright (c) 2000, 2002-2007 MySQL AB, 2009 Sun Microsystems, Inc.
2 Use is subject to license terms.
3
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; version 2 of the License.
7
8 This program is distributed in the hope that it will be useful,
9 but WITHOUT ANY WARRANTY; without even the implied warranty of
10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
11 GNU General Public License for more details.
12
13 You should have received a copy of the GNU General Public License
14 along with this program; if not, write to the Free Software
15 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
16
17 #include "heapdef.h"
18
heap_rkey(HP_INFO * info,uchar * record,int inx,const uchar * key,key_part_map keypart_map,enum ha_rkey_function find_flag)19 int heap_rkey(HP_INFO *info, uchar *record, int inx, const uchar *key,
20 key_part_map keypart_map, enum ha_rkey_function find_flag)
21 {
22 uchar *pos;
23 HP_SHARE *share= info->s;
24 HP_KEYDEF *keyinfo= share->keydef + inx;
25 DBUG_ENTER("heap_rkey");
26 DBUG_PRINT("enter",("info: %p inx: %d", info, inx));
27
28 if ((uint) inx >= share->keys)
29 {
30 DBUG_RETURN(my_errno= HA_ERR_WRONG_INDEX);
31 }
32 info->lastinx= inx;
33 info->current_record= (ulong) ~0L; /* For heap_rrnd() */
34 info->key_version= info->s->key_version;
35
36 if (keyinfo->algorithm == HA_KEY_ALG_BTREE)
37 {
38 heap_rb_param custom_arg;
39
40 custom_arg.keyseg= info->s->keydef[inx].seg;
41 custom_arg.key_length= info->lastkey_len=
42 hp_rb_pack_key(keyinfo, (uchar*) info->lastkey,
43 (uchar*) key, keypart_map);
44 custom_arg.search_flag= SEARCH_FIND | SEARCH_SAME;
45 /* for next rkey() after deletion */
46 if (find_flag == HA_READ_AFTER_KEY)
47 info->last_find_flag= HA_READ_KEY_OR_NEXT;
48 else if (find_flag == HA_READ_BEFORE_KEY)
49 info->last_find_flag= HA_READ_KEY_OR_PREV;
50 else
51 info->last_find_flag= find_flag;
52 if (!(pos= tree_search_key(&keyinfo->rb_tree, info->lastkey, info->parents,
53 &info->last_pos, find_flag, &custom_arg)))
54 {
55 info->update= HA_STATE_NO_KEY;
56 DBUG_RETURN(my_errno= HA_ERR_KEY_NOT_FOUND);
57 }
58 memcpy(&pos, pos + (*keyinfo->get_key_length)(keyinfo, pos), sizeof(uchar*));
59 info->current_ptr= pos;
60 }
61 else
62 {
63 if (!(pos= hp_search(info, share->keydef + inx, key, 0)))
64 {
65 info->update= HA_STATE_NO_KEY;
66 DBUG_RETURN(my_errno);
67 }
68 if ((keyinfo->flag & (HA_NOSAME | HA_NULL_PART_KEY)) != HA_NOSAME)
69 memcpy(info->lastkey, key, (size_t) keyinfo->length);
70 }
71 memcpy(record, pos, (size_t) share->reclength);
72 info->update= HA_STATE_AKTIV;
73 DBUG_RETURN(0);
74 }
75
76
77 /* Quick find of record */
78
heap_find(HP_INFO * info,int inx,const uchar * key)79 uchar* heap_find(HP_INFO *info, int inx, const uchar *key)
80 {
81 return hp_search(info, info->s->keydef + inx, key, 0);
82 }
83