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<?php
/**
* SessionHandler:: implementation for MySQL (native).
*
* Required values for $params:<pre>
* 'hostspec' The hostname of the database server.
* 'protocol' The communication protocol ('tcp', 'unix', etc.).
* 'username' The username with which to connect to the database.
* 'password' The password associated with 'username'.
* 'database' The name of the database.
* 'table' The name of the sessiondata table in 'database'.</pre>
*
* Required for some configurations:
* 'port' The port on which to connect to the database.
*
* Optional parameters:
* 'persistent' Use persistent DB connections? (boolean)
*
* The table structure can be created by the scripts/db/sessionhandler.sql
* script.
*
* $Horde: horde/lib/SessionHandler/mysql.php,v 1.3.2.4 2003/05/19 17:56:11 slusarz Exp $
*
* Copyright 2002-2003 Chuck Hagenbuch <chuck@horde.org>
*
* See the enclosed file COPYING for license information (LGPL). If you
* did not receive this file, see http://www.fsf.org/copyleft/lgpl.html.
*
* @author Mike Cochrame <mike@graftonhall.co.nz>
* @version $Revision: 1.3.2.4 $
* @since Horde 2.2
* @package horde.session
*/
class SessionHandler_mysql extends SessionHandler {
/**
* Hash containing connection parameters.
*
* @var array $_params
*/
var $_params = array();
/**
* Handle for the current database connection.
*
* @var resource $_db
*/
var $_db;
/**
* Are we connected to the SQL server.
*
* @var boolean $_connected
*/
var $_connected = false;
/**
* The quote function to use.
*
* @var string $_quote
*/
var $_quote = null;
/**
* Constructs a new MySQL SessionHandler object.
*
* @access public
*
* @param optional array $params A hash containing connection parameters.
* See details above.
*/
function SessionHandler_mysql($params = array())
{
$this->_params = $params;
}
/**
* TODO
*/
function open($save_path, $session_name)
{
/* Connect to database. */
$this->_connect();
}
/**
* TODO
*/
function close()
{
/* Disconnect from database. */
$this->_disconnect();
}
/**
* TODO
*/
function read($id)
{
/* Make sure we have a valid database connection. */
$this->_connect();
/* Session timeout, don't rely on garbage collection */
$timeout = time() - ini_get('session.gc_maxlifetime');
$query = sprintf('SELECT session_data FROM %s WHERE session_id = %s' .
' AND session_lastmodified > %s',
$this->_params['table'],
$this->_quote($id),
$timeout);
/* Log the query at a DEBUG log level. */
Horde::logMessage(sprintf('SQL Query by SessionHandler_mysql::read(): query = "%s"', $query),
__FILE__, __LINE__, LOG_DEBUG);
$result = @mysql_query($query, $this->_db);
if (!$result){
Horde::logMessage('Error retrieving session data (id = ' . $id . ')',
__FILE__, __LINE__, LOG_ERR);
return '';
}
list($value) = mysql_fetch_row($result);
return $value;
}
/**
* TODO
*/
function write($id, $session_data)
{
/* Make sure we have a valid database connection. */
$this->_connect();
/* Build the SQL query. */
$query = sprintf('REPLACE INTO %s (session_id, session_data, session_lastmodified)' .
' VALUES (%s, %s, %s)',
$this->_params['table'],
$this->_quote($id),
$this->_quote($session_data),
time());
/* Log the query at a DEBUG log level. */
Horde::logMessage(sprintf('SQL Query by SessionHandler_mysql::write(): query = "%s"', $query),
__FILE__, __LINE__, LOG_DEBUG);
$result = mysql_query($query, $this->_db);
if (!$result){
Horde::logMessage('Error writing session data', __FILE__, __LINE__, LOG_ERR);
return false;
}
return true;
}
/**
* TODO
*/
function destroy($id)
{
/* Make sure we have a valid database connection. */
$this->_connect();
/* Build the SQL query. */
$query = sprintf('DELETE FROM %s WHERE session_id = %s',
$this->_params['table'], $this->_quote($id));
/* Log the query at a DEBUG log level. */
Horde::logMessage(sprintf('SQL Query by SessionHandler_mysql::destroy(): query = "%s"', $query),
__FILE__, __LINE__, LOG_DEBUG);
/* Execute the query. */
$result = @mysql_query($query, $this->_db);
if (!$result) {
Horde::logMessage('Failed to delete session (id = ' . $id . ')', __FILE__, __LINE__, LOG_ERR);
return false;
}
return true;
}
/**
* TODO
*/
function gc($maxlifetime = 300)
{
/* Make sure we have a valid database connection. */
$this->_connect();
/* Build the SQL query. */
$query = sprintf('DELETE FROM %s WHERE session_lastmodified < %s',
$this->_params['table'], (int)(time() - $maxlifetime));
/* Log the query at a DEBUG log level. */
Horde::logMessage(sprintf('SQL Query by SessionHandler_mysql::gc(): query = "%s"', $query),
__FILE__, __LINE__, LOG_DEBUG);
/* Execute the query. */
$result = @mysql_query($query, $this->_db);
if (!$result) {
Horde::logMessage('Error garbage collecting old sessions', __FILE__, __LINE__, LOG_ERR);
return false;
}
return @mysql_affected_rows($this->_db);
}
/**
* Escape a mysql string.
*
* @access private
*
* @param string $value The string to quote.
*
* @return string The quoted string.
*/
function _quote($value)
{
if (is_null($this->_quote)) {
$this->_quote = function_exists('mysql_real_escape_string') ?
'mysql_real_escape_string' :
'mysql_escape_string';
}
switch (strtolower(gettype($value))) {
case 'null':
return 'NULL';
case 'integer':
return $value;
case 'string':
default:
return "'" . call_user_func($this->_quote, $value) . "'";
}
}
/**
* Attempts to open a connection to the SQL server.
*
* @access private
*/
function _connect()
{
if ($this->_connected) {
return;
}
if (!is_array($this->_params)) {
Horde::fatal(PEAR::raiseError(_("No configuration information specified for SQL SessionHandler.")), __FILE__, __LINE__);
}
$check = array('hostspec', 'username', 'password', 'database');
foreach ($check as $val) {
if (!array_key_exists($val, $this->_params)) {
Horde::fatal(PEAR::raiseError(sprintf(_("Required '%s' not specified in SessionHandler configuration."), $val)), __FILE__, __LINE__);
}
}
if (!array_key_exists('table', $this->_params)) {
$this->_params['table'] = 'horde_sessionhandler';
}
if (empty($this->_params['persistent'])) {
$connect = 'mysql_connect';
} else {
$connect = 'mysql_pconnect';
}
if (!$this->_db = @$connect($this->_params['hostspec'],
$this->_params['username'],
$this->_params['password'])) {
Horde::fatal(PEAR::raiseError(_("Could not connect to database for SQL SessionHandler.")), __FILE__, __LINE__);
}
if (!@mysql_select_db($this->_params['database'], $this->_db)) {
Horde::fatal(PEAR::raiseError(sprintf(_("Could not connect to table '%s' for SQL SessionHandler."), $this->_params['database']), __FILE__, __LINE__));
}
$this->_connected = true;
}
/**
* Disconnect from the SQL server and clean up the connection.
*
* @access private
*/
function _disconnect()
{
if ($this->_connected) {
return @mysql_close($this->_db);
}
$this->_connected = false;
}
}
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