1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
/* Copyright (c) 2000-2002, 2005-2007 MySQL AB
Use is subject to license terms
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; version 2 of the License.
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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */
/* Scan through all rows */
#include "heapdef.h"
/*
Returns one of following values:
0 = Ok.
HA_ERR_RECORD_DELETED = Record is deleted.
HA_ERR_END_OF_FILE = EOF.
*/
int heap_scan_init(register HP_INFO *info)
{
DBUG_ENTER("heap_scan_init");
info->lastinx= -1;
info->current_record= (ulong) ~0L; /* No current record */
info->update=0;
info->next_block=0;
info->key_version= info->s->key_version;
info->file_version= info->s->file_version;
DBUG_RETURN(0);
}
int heap_scan(register HP_INFO *info, uchar *record)
{
HP_SHARE *share=info->s;
ulong pos;
DBUG_ENTER("heap_scan");
pos= ++info->current_record;
if (pos < info->next_block)
{
info->current_ptr+=share->block.recbuffer;
}
else
{
/* increase next_block to the next records_in_block boundary */
ulong rem= info->next_block % share->block.records_in_block;
info->next_block+=share->block.records_in_block - rem;
if (info->next_block >= share->records+share->deleted)
{
info->next_block= share->records+share->deleted;
if (pos >= info->next_block)
{
info->update= 0;
DBUG_RETURN(my_errno= HA_ERR_END_OF_FILE);
}
}
hp_find_record(info, pos);
}
if (!info->current_ptr[share->visible])
{
DBUG_PRINT("warning",("Found deleted record"));
info->update= HA_STATE_PREV_FOUND | HA_STATE_NEXT_FOUND;
DBUG_RETURN(my_errno=HA_ERR_RECORD_DELETED);
}
info->update= HA_STATE_PREV_FOUND | HA_STATE_NEXT_FOUND | HA_STATE_AKTIV;
memcpy(record,info->current_ptr,(size_t) share->reclength);
info->current_hash_ptr=0; /* Can't use read_next */
DBUG_RETURN(0);
} /* heap_scan */
|
