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<?php defined("SYSPATH") or die("No direct script access.");
/**
* Gallery - a web based photo album viewer and editor
* Copyright (C) 2000-2010 Bharat Mediratta
*
* 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.
*
* 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 02110-1301, USA.
*/
/*
* Based on the Cache_Sqlite_Driver developed by the Kohana Team
*/
class Cache_Database_Driver extends Cache_Driver {
// Kohana database instance
protected $db;
/**
* Sets a cache item to the given data, tags, and lifetime.
*
* @param array assoc array of key => value pairs
* @param array cache tags
* @param integer lifetime
* @return bool
*/
public function set($items, $tags=null, $lifetime=null) {
if (!empty($tags)) {
// Escape the tags, adding brackets so the tag can be explicitly matched
$tags = "<" . implode(">,<", $tags) . ">";
} else {
$tags = null;
}
// Cache Database driver expects unix timestamp
if ($lifetime !== 0) {
$lifetime += time();
}
$db = Database::instance();
$tags = $db->escape($tags);
foreach ($items as $id => $data) {
$id = $db->escape($id);
$data = $db->escape(serialize($data));
$db->query("INSERT INTO {caches} (`key`, `tags`, `expiration`, `cache`)
VALUES ('$id', '$tags', $lifetime, '$data')
ON DUPLICATE KEY UPDATE `tags` = VALUES(tags), `expiration` = VALUES(expiration),
`cache` = VALUES(cache)");
}
return true;
}
/**
* Get cache items by tag
* @param array cache tags
* @return array cached data
*/
public function get_tag($tags) {
$db = db::build()
->select()
->from("caches");
foreach ($tags as $tag) {
$db->where("tags", "LIKE", "%<$tag>%");
}
$db_result = $db->execute();
// An array will always be returned
$result = array();
// Disable notices for unserializing
$ER = error_reporting(~E_NOTICE);
if ($db_result->count() > 0) {
foreach ($db_result as $row) {
// Add each cache to the array
$result[$row->key] = unserialize($row->cache);
}
}
error_reporting($ER);
return $result;
}
/**
* Fetches a cache item. This will delete the item if it is expired or if
* the hash does not match the stored hash.
*
* @param string cache id
* @return mixed|NULL
*/
public function get($keys, $single=false) {
$data = null;
$result = db::build()
->select()
->from("caches")
->where("key", "IN", $keys)
->execute();
if (count($result) > 0) {
$cache = $result->current();
// Make sure the expiration is valid and that the hash matches
if ($cache->expiration != 0 && $cache->expiration <= time()) {
// Cache is not valid, delete it now
$this->delete(array($cache->id));
} else {
// Disable notices for unserializing
$ER = error_reporting(~E_NOTICE);
// Return the valid cache data
$data = unserialize($cache->cache);
// Turn notices back on
error_reporting($ER);
}
}
return $data;
}
/**
* Deletes a cache item by id or tag
*
* @param string cache id or tag, or true for "all items"
* @param bool delete a tag
* @return bool
*/
public function delete($keys, $is_tag=false) {
$db = db::build()
->delete("caches");
if ($keys === true) {
// Delete all caches
} else if ($is_tag === true) {
foreach ($keys as $tag) {
$db->where("tags", "LIKE", "%<$tag>%");
}
} else {
$db->where("key", "IN", $keys);
}
$status = $db->execute();
return count($status) > 0;
}
/**
* Delete cache items by tag
*/
public function delete_tag($tags) {
return $this->delete($tags, true);
}
/**
* Empty the cache
*/
public function delete_all() {
Database::instance()->query("TRUNCATE {caches}");
}
}
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