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
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
<?php
/*
Question2Answer (c) Gideon Greenspan
http://www.question2answer.org/
File: qa-include/qa-db-blobs.php
Version: See define()s at top of qa-include/qa-base.php
Description: Database-level access to blobs table for large chunks of data (e.g. images)
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.
More about this license: http://www.question2answer.org/license.php
*/
if (!defined('QA_VERSION')) { // don't allow this page to be requested directly from browser
header('Location: ../');
exit;
}
function qa_db_blob_create($content, $format, $filename=null, $userid=null, $cookieid=null, $ip=null)
/*
Create a new blob in the database with $content and $format, returning its blobid
*/
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
for ($attempt=0; $attempt<10; $attempt++) {
$blobid=qa_db_random_bigint();
if (qa_db_blob_exists($blobid))
continue;
qa_db_query_sub(
'INSERT INTO ^blobs (blobid, format, content, filename, userid, cookieid, createip, created) VALUES (#, $, $, $, $, #, INET_ATON($), NOW())',
$blobid, $format, $content, $filename, $userid, $cookieid, $ip
);
return $blobid;
}
return null;
}
function qa_db_blob_read($blobid)
/*
Get the content of blob $blobid from the database
*/
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
return qa_db_read_one_assoc(qa_db_query_sub(
'SELECT content, format, filename FROM ^blobs WHERE blobid=#',
$blobid
), true);
}
function qa_db_blob_delete($blobid)
/*
Delete blob $blobid in the database
*/
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
qa_db_query_sub(
'DELETE FROM ^blobs WHERE blobid=#',
$blobid
);
}
function qa_db_blob_exists($blobid)
/*
Check if blob $blobid exists in the database
*/
{
if (qa_to_override(__FUNCTION__)) { $args=func_get_args(); return qa_call_override(__FUNCTION__, $args); }
return qa_db_read_one_value(qa_db_query_sub(
'SELECT COUNT(*) FROM ^blobs WHERE blobid=#',
$blobid
)) > 0;
}
/*
Omit PHP closing tag to help avoid accidental output
*/