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
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
|
<?php
/**
*
* @package acm_db
* @version $Id$
* @copyright (c) 2005 phpBB Group
* @license http://opensource.org/licenses/gpl-license.php GNU Public License
*
*/
/**
* @package acm_db
* ACM Database Caching
*/
class acm
{
// Contains all loaded variables
var $vars = '';
// Contains the names of the variables that are ready to be used
// (iow, variables that have been unserialized)
var $var_ready = array();
// Contains variables that have been updated or destroyed this session
var $var_expires = array();
// Contains variables that have already been requested
// If a variable has been requested but not loaded, it simply means it
// wasn't found in the db
var $var_requested = array();
function load($var_names = '')
{
global $db;
$this->vars = array();
if (is_array($var_names))
{
$var_requested = $var_names;
$sql_condition = "var_name IN ('" . implode("', '", $var_names) . "')";
}
else
{
// $sql_condition = "var_name NOT LIKE '\_%'";
$sql_condition = "LEFT(var_name, 1) <> '_'";
}
$sql = 'SELECT var_name, var_data
FROM ' . CACHE_TABLE . '
WHERE var_expires > ' . time() . "
AND $sql_condition";
$result = $db->sql_query($sql);
while ($row = $db->sql_fetchrow($result))
{
$this->vars[$row['var_name']] = $row['var_data'];
if (!$var_names)
{
$var_requested[] = $row['var_name'];
}
}
}
function unload()
{
$this->save();
unset($this->vars);
}
function save()
{
global $db;
$delete = $insert = array();
foreach ($this->var_expires as $var_name => $expires)
{
if ($expires == 'now')
{
$delete[] = $var_name;
}
else
{
$delete[] = $var_name;
$insert[] = "'$var_name', $expires, '" . $db->sql_escape(serialize($this->vars[$var_name])) . "'";
}
}
$this->var_expires = array();
if (count($delete))
{
$sql = 'DELETE FROM ' . CACHE_TABLE . "
WHERE var_name IN ('" . implode("', '", $delete) . "')";
$db->sql_query($sql);
}
if (count($insert))
{
switch (SQL_LAYER)
{
case 'mysql':
case 'mysql4':
$sql = 'INSERT INTO ' . CACHE_TABLE . ' (var_name, var_expires, var_data)
VALUES (' . implode('), (', $insert) . ')';
$db->sql_query($sql);
break;
default:
foreach ($insert as $values)
{
$sql = 'INSERT INTO ' . CACHE_TABLE . " (var_name, var_expires, var_data)
VALUES ($values)";
$db->sql_query($sql);
}
}
}
}
function tidy()
{
global $db;
$sql = 'DELETE FROM ' . CACHE_TABLE . '
WHERE var_expires < ' . time();
$db->sql_query($sql);
}
function get($var_name)
{
if (!is_array($this->vars))
{
$this->load();
}
if ($var_name{0} == '_')
{
if (!in_array($this->var_requested, $var_name))
{
$this->var_requested[] = $var_name;
global $db;
$sql = 'SELECT var_data
FROM ' . CACHE_TABLE . "
WHERE var_name = '$var_name'
AND var_expires > " . time();
$result = $db->sql_query($sql);
if ($row = $db->sql_fetchrow($result))
{
$this->vars[$var_name] = $row['var_data'];
}
}
}
if ($this->exists($var_name))
{
if (empty($this->var_ready[$var_name]))
{
$this->vars[$var_name] = unserialize($this->vars[$var_name]);
$this->var_ready[$var_name] = TRUE;
}
return $this->vars[$var_name];
}
else
{
return NULL;
}
}
function put($var_name, $var_data, $ttl = 31536000)
{
$this->vars[$var_name] = $var_data;
if ($var_name{0} == '_')
{
global $db;
switch (SQL_LAYER)
{
case 'mysql':
case 'mysql4':
$INSERT = 'REPLACE';
break;
default:
$sql = 'DELETE FROM ' . CACHE_TABLE . "
WHERE var_name = '$var_name'";
$db->sql_query($sql);
$INSERT = 'INSERT';
}
$sql = "$INSERT INTO " . CACHE_TABLE . " (var_name, var_expires, var_data)
VALUES ('$var_name', " . (time() + $ttl) . ", '" . $db->sql_escape(serialize($var_data)) . "')";
$db->sql_query($sql);
}
else
{
$this->var_expires[$var_name] = time() + $ttl;
}
}
function destroy($var_name, $void = NULL)
{
if (isset($this->vars[$var_name]))
{
$this->var_expires[$var_name] = 'now';
unset($this->vars[$var_name]);
}
}
function exists($var_name)
{
if (!is_array($this->vars))
{
$this->load();
}
return isset($this->vars[$var_name]);
}
}
?>
|
