1/* Copyright (c) 2000, 2004-2006 MySQL AB
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 Street, Fifth Floor, Boston, MA 02110-1301, USA */
16
17/* Extra functions we want to do with a database */
18/* - Set flags for quicker databasehandler */
19/* - Set databasehandler to normal */
20/* - Reset recordpointers as after open database */
21
22#include "heapdef.h"
23
24static void heap_extra_keyflag(register HP_INFO *info,
25 enum ha_extra_function function);
26
27
28 /* set extra flags for database */
29
30int heap_extra(register HP_INFO *info, enum ha_extra_function function)
31{
32 DBUG_ENTER("heap_extra");
33
34 switch (function) {
35 case HA_EXTRA_RESET_STATE:
36 heap_reset(info);
37 /* fall through */
38 case HA_EXTRA_NO_READCHECK:
39 info->opt_flag&= ~READ_CHECK_USED; /* No readcheck */
40 break;
41 case HA_EXTRA_READCHECK:
42 info->opt_flag|= READ_CHECK_USED;
43 break;
44 case HA_EXTRA_CHANGE_KEY_TO_UNIQUE:
45 case HA_EXTRA_CHANGE_KEY_TO_DUP:
46 heap_extra_keyflag(info, function);
47 break;
48 default:
49 break;
50 }
51 DBUG_RETURN(0);
52} /* heap_extra */
53
54
55int heap_reset(HP_INFO *info)
56{
57 info->lastinx= -1;
58 info->current_record= (ulong) ~0L;
59 info->current_hash_ptr=0;
60 info->update=0;
61 info->next_block=0;
62 return 0;
63}
64
65
66/*
67 Start/Stop Inserting Duplicates Into a Table, WL#1648.
68 */
69static void heap_extra_keyflag(register HP_INFO *info,
70 enum ha_extra_function function)
71{
72 uint idx;
73
74 for (idx= 0; idx< info->s->keys; idx++)
75 {
76 switch (function) {
77 case HA_EXTRA_CHANGE_KEY_TO_UNIQUE:
78 info->s->keydef[idx].flag|= HA_NOSAME;
79 break;
80 case HA_EXTRA_CHANGE_KEY_TO_DUP:
81 info->s->keydef[idx].flag&= ~(HA_NOSAME);
82 break;
83 default:
84 break;
85 }
86 }
87}
88