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- <?php
- // +----------------------------------------------------------------------+
- // | PHP version 4.0 |
- // +----------------------------------------------------------------------+
- // | Copyright (c) 1997, 1998, 1999, 2000, 2001 The PHP Group |
- // +----------------------------------------------------------------------+
- // | This source file is subject to version 2.0 of the PHP license, |
- // | that is bundled with this package in the file LICENSE, and is |
- // | available at through the world-wide-web at |
- // | http://www.php.net/license/2_02.txt. |
- // | If you did not receive a copy of the PHP license and are unable to |
- // | obtain it through the world-wide-web, please send a note to |
- // | license@php.net so we can mail you a copy immediately. |
- // +----------------------------------------------------------------------+
- // | Authors: Ulf Wendel <ulf.wendel@phpdoc.de> |
- // | Sebastian Bergmann <sb@sebastian-bergmann.de> |
- // | Chuck Hagenbuch <chuck@horde.org> |
- // +----------------------------------------------------------------------+
- //
- // $Id: db.php,v 1.9 2001/03/08 20:39:16 uw Exp $
-
- require_once 'DB.php';
- require_once 'Cache/Container.php';
-
- /**
- * PEAR/DB Cache Container.
- *
- * WARNING: Other systems might or might not support certain datatypes of
- * the tables shown. As far as I know there's no large binary
- * type in SQL-92 or SQL-99. Postgres seems to lack any
- * BLOB or TEXT type, for MS-SQL you could use IMAGE, don't know
- * about other databases. Please add sugestions for other databases to
- * the inline docs.
- *
- * The field 'changed' has no meaning for the Cache itself. It's just there
- * because it's a good idea to have an automatically updated timestamp
- * field for debugging in all of your tables.
- *
- * For _MySQL_ you need this DB table:
- *
- * CREATE TABLE cache (
- * id CHAR(32) NOT NULL DEFAULT '',
- * cachegroup VARCHAR(127) NOT NULL DEFAULT '',
- * cachedata BLOB NOT NULL DEFAULT '',
- * userdata VARCHAR(255) NOT NULL DEFAUL '',
- * expires INT(9) NOT NULL DEFAULT 0,
- *
- * changed TIMESTAMP(14) NOT NULL,
- *
- * INDEX (expires),
- * PRIMARY KEY (id, cachegroup)
- * )
- *
- * @author Sebastian Bergmann <sb@sebastian-bergmann.de>
- * @version $Id: db.php,v 1.9 2001/03/08 20:39:16 uw Exp $
- * @package Cache
- */
- class Cache_Container_db extends Cache_Container {
-
- /**
- * Name of the DB table to store caching data
- *
- * @see Cache_Container_file::$filename_prefix
- */
- var $cache_table = '';
-
- /**
- * PEAR DB dsn to use.
- *
- * @var string
- */
- var $dsn = '';
-
- /**
- * PEAR DB object
- *
- * @var object PEAR_DB
- */
- var $db;
-
- function Cache_Container_db($options)
- {
- if (!is_array($options) || !isset($options['dsn'])) {
- return new Cache_Error('No dsn specified!', __FILE__, __LINE__);
- }
-
- $this->setOptions($options, array('dsn', 'cache_table'));
-
- if (!$this->dsn)
- return new Cache_Error('No dsn specified!', __FILE__, __LINE__);
-
- $this->db = DB::connect($this->dsn, true);
- if (DB::isError($this->db)) {
- return new Cache_Error('DB::connect failed: ' . DB::errorMessage($this->db), __FILE__, __LINE__);
- } else {
- $this->db->setFetchMode(DB_FETCHMODE_ASSOC);
- }
- }
-
- function fetch($id, $group)
- {
- $query = sprintf("SELECT cachedata, userdata, expires FROM %s WHERE id = '%s' AND cachegroup = '%s'",
- $this->cache_table,
- addslashes($id),
- addslashes($group)
- );
-
- $res = $this->db->query($query);
-
- if (DB::isError($res))
- return new Cache_Error('DB::query failed: ' . DB::errorMessage($res), __FILE__, __LINE__);
-
- $row = $res->fetchRow();
-
- if (is_array($row))
- return array($row['expires'], $this->decode($row['cachedata']), $row['userdata']);
- }
-
- /**
- * Stores a dataset.
- *
- * WARNING: we use the SQL command REPLACE INTO this might be
- * MySQL specific. As MySQL is very popular the method should
- * work fine for 95% of you.
- */
- function save($id, $data, $expires, $group, $userdata)
- {
- $this->flushPreload($id, $group);
-
- $query = sprintf("REPLACE INTO %s (userdata, cachedata, expires, id, cachegroup) VALUES ('%s', '%s', %d, '%s', '%s')",
- $this->cache_table,
- addslashes($userdata),
- addslashes($this->encode($data)),
- $this->getExpiresAbsolute($expires) ,
- addslashes($id),
- addslashes($group)
- );
-
- $res = $this->db->query($query);
-
- if (DB::isError($res)) {
- return new Cache_Error('DB::query failed: ' . DB::errorMessage($res) , __FILE__, __LINE__);
- }
- }
-
- function delete($id, $group)
- {
- $this->flushPreload($id, $group);
-
- $query = sprintf("DELETE FROM %s WHERE id = '%s' and cachegroup = '%s'",
- $this->cache_table,
- addslashes($id),
- addslashes($group)
- );
-
- $res = $this->db->query($query);
-
- if (DB::isError($res))
- return new Cache_Error('DB::query failed: ' . DB::errorMessage($res), __FILE__, __LINE__);
- }
-
- function flush($group = "")
- {
- $this->flushPreload();
-
- if ($group) {
- $query = sprintf("DELETE FROM %s WHERE cachegroup = '%s'", $this->cache_table, addslashes($group));
- } else {
- $query = sprintf("DELETE FROM %s", $this->cache_table);
- }
-
- $res = $this->db->query($query);
-
- if (DB::isError($res))
- return new Cache_Error('DB::query failed: ' . DB::errorMessage($res), __FILE__, __LINE__);
- }
-
- function idExists($id, $group)
- {
- $query = sprintf("SELECT id FROM %s WHERE ID = '%s' AND cachegroup = '%s'",
- $this->cache_table,
- addslashes($id),
- addslashes($group)
- );
-
- $res = $this->db->query($query);
-
- if (DB::isError($res))
- return new Cache_Error('DB::query failed: ' . DB::errorMessage($res), __FILE__, __LINE__);
-
- $row = $res->fetchRow();
-
- if (is_array($row)) {
- return true;
- } else {
- return false;
- }
- }
-
- function garbageCollection()
- {
- $query = sprintf('DELETE FROM %s WHERE expires <= %d AND expires > 0',
- $this->cache_table,
- time());
-
- $res = $this->db->query($query);
-
- if (DB::isError($res)) {
- return new Cache_Error('DB::query failed: ' . DB::errorMessage($res), __FILE__, __LINE__);
- }
- }
- }
- ?>
-