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<?php
/***************************************************************************
* acm_db.php
* -------------------
* begin : Saturday, Feb 13, 2001
* copyright : (C) 2001 The phpBB Group
* email : support@phpbb.com
*
* $Id$
*
***************************************************************************/
/***************************************************************************
*
* 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.
*
***************************************************************************/
class acm
{
var $db;
var $is_modified = FALSE;
var $vars = '';
var $sql_enabled = FALSE;
function acm(&$db)
{
$this->db =& $db;
}
function load($var_names = '')
{
$this->vars = array();
$sql = 'SELECT var_name, var_ts, var_data
FROM ' . CACHE_TABLE;
if (!empty($var_names))
{
$sql .= " WHERE var_name IN ('" . implode("', '", $var_names) . "')";
}
$result = $this->db->sql_query($sql);
while ($row = $this->db->sql_fetchrow($result))
{
$this->vars[$row['var_name']] = array(
'data' => unserialize($row['var_data']),
'ts' => intval($row['var_ts'])
);
}
}
function unload()
{
$this->save();
unset($this->vars);
}
function save()
{
if (!$this->is_modified)
{
return;
}
$delete = $insert = array();
foreach ($this->vars as $var_name => $var_ary)
{
if (!empty($var_ary['is_modified']))
{
if (!empty($var_ary['delete']))
{
$delete[] = $var_name;
}
else
{
$delete[] = $var_name;
$insert[] = "'$var_name', " . time() . ", '" . $this->db->sql_escape(serialize($var_ary['data'])) . "'";
}
$this->db->sql_query($sql);
}
}
if (count($delete))
{
$sql = 'DELETE FROM ' . CACHE_TABLE . "
WHERE var_name IN ('" . implode("', '", $delete) . "')";
$this->db->sql_query($sql);
}
if (count($insert))
{
switch (SQL_LAYER)
{
case 'mysql':
$sql = 'INSERT INTO ' . CACHE_TABLE . ' (var_name, var_ts, var_data)
VALUES (' . implode('), (', $insert) . ')';
$this->db->sql_query($sql);
break;
default:
foreach ($insert as $values)
{
$sql = 'INSERT INTO ' . CACHE_TABLE . " (var_name, var_ts, var_data)
VALUES ($values)";
$this->db->sql_query($sql);
}
}
}
$this->is_modified = FALSE;
}
function tidy($max_age = 0)
{
$sql = 'DELETE FROM ' . CACHE_TABLE . '
WHERE var_ts < ' . (time() - $max_age);
$this->db->sql_query($sql);
}
function get($var_name, $max_age = 0)
{
return ($this->exists($var_name, $max_age)) ? $this->vars[$var_name]['data'] : NULL;
}
function put($var_name, $var_data)
{
$this->vars[$var_name] = array(
'data' => $var_data,
'ts' => time(),
'is_modified' => TRUE
);
$this->is_modified = TRUE;
}
function destroy($var_name)
{
if (isset($this->vars[$var_name]))
{
$this->is_modified = TRUE;
$this->vars[$var_name] = array(
'is_modified' => TRUE,
'delete' => TRUE
);
}
}
function exists($var_name, $max_age = 0)
{
if (!is_array($this->vars))
{
$this->load();
}
if ($max_age > 0 && isset($this->vars[$var_name]))
{
if ($this->vars[$var_name]['ts'] + $max_age < time())
{
$this->destroy($var_name);
return FALSE;
}
}
return isset($this->vars[$var_name]);
}
}
?>
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