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database.php
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database.php
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<?php
/**
* @version $Id:database.php 6961 2007-03-15 16:06:53Z tcp $
* @package Joomla.Framework
* @subpackage Session
* @copyright Copyright (C) 2005 - 2011 Open Source Matters, Inc. All rights reserved.
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
// No direct access
defined('JPATH_BASE') or die;
/**
* Database session storage handler for PHP
*
* @package Joomla.Framework
* @subpackage Session
* @since 1.5
* @see http://www.php.net/manual/en/function.session-set-save-handler.php
*/
class JSessionStorageDatabase extends JSessionStorage
{
protected $_data = null;
/**
* Open the SessionHandler backend.
*
* @param string The path to the session object.
* @param string The name of the session.
* @return boolean True on success, false otherwise.
* @since 1.5
*/
public function open($save_path, $session_name)
{
return true;
}
/**
* Close the SessionHandler backend.
*
* @return boolean True on success, false otherwise.
* @since 1.5
*/
public function close()
{
return true;
}
/**
* Read the data for a particular session identifier from the
* SessionHandler backend.
*
* @param string The session identifier.
* @return string The session data.
* @since 1.5
*/
public function read($id)
{
// Get the database connection object and verify its connected.
$db = JFactory::getDbo();
if (!$db->connected()) {
return false;
}
// Get the session data from the database table.
$db->setQuery(
'SELECT `data`' .
' FROM `#__session`' .
' WHERE `session_id` = '.$db->quote($id)
);
return (string) $db->loadResult();
}
/**
* Write session data to the SessionHandler backend.
*
* @param string The session identifier.
* @param string The session data.
* @return boolean True on success, false otherwise.
* @since 1.5
*/
public function write($id, $data)
{
// Get the database connection object and verify its connected.
$db = JFactory::getDbo();
if (!$db->connected()) {
return false;
}
// Try to update the session data in the database table.
$db->setQuery(
'UPDATE `#__session`' .
' SET `data` = '.$db->quote($data).',' .
' `time` = '.(int) time() .
' WHERE `session_id` = '.$db->quote($id)
);
if (!$db->query()) {
return false;
}
if ($db->getAffectedRows()) {
return true;
} else {
// If the session does not exist, we need to insert the session.
$db->setQuery(
'INSERT INTO `#__session` (`session_id`, `data`, `time`)' .
' VALUES ('.$db->quote($id).', '.$db->quote($data).', '.(int) time().')'
);
return (boolean) $db->query();
}
}
/**
* Destroy the data for a particular session identifier in the
* SessionHandler backend.
*
* @param string The session identifier.
* @return boolean True on success, false otherwise.
* @since 1.5
*/
public function destroy($id)
{
// Get the database connection object and verify its connected.
$db = JFactory::getDbo();
if (!$db->connected()) {
return false;
}
// Remove a session from the database.
$db->setQuery(
'DELETE FROM `#__session`' .
' WHERE `session_id` = '.$db->quote($id)
);
return (boolean) $db->query();
}
/**
* Garbage collect stale sessions from the SessionHandler backend.
*
* @param integer The maximum age of a session.
* @return boolean True on success, false otherwise.
* @since 1.5
*/
function gc($lifetime = 1440)
{
// Get the database connection object and verify its connected.
$db = JFactory::getDbo();
if (!$db->connected()) {
return false;
}
// Determine the timestamp threshold with which to purge old sessions.
$past = time() - $lifetime;
// Remove expired sessions from the database.
$db->setQuery(
'DELETE FROM `#__session`' .
' WHERE `time` < '.(int) $past
);
return (boolean) $db->query();
}
}