Database.php
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<?php
/*
+------------------------------------------------------------------------+
| Phalcon Framework |
+------------------------------------------------------------------------+
| Copyright (c) 2011-2012 Phalcon Team (http://www.phalconphp.com) |
+------------------------------------------------------------------------+
| This source file is subject to the New BSD License that is bundled |
| with this package in the file docs/LICENSE.txt. |
| |
| If you did not receive a copy of the license and are unable to |
| obtain it through the world-wide-web, please send an email |
| to license@phalconphp.com so we can send you a copy immediately. |
+------------------------------------------------------------------------+
| Authors: Andres Gutierrez <andres@phalconphp.com> |
| Eduar Carvajal <eduar@phalconphp.com> |
| Nikita Vershinin <endeveit@gmail.com> |
+------------------------------------------------------------------------+
*/
use Phalcon\Db;
use Phalcon\Session\Adapter;
use Phalcon\Session\AdapterInterface;
use Phalcon\Session\Exception;
/**
* Phalcon\Session\Adapter\Database
* Database adapter for Phalcon\Session
*/
class Database extends Adapter implements AdapterInterface
{
/**
* Flag to check if session is destroyed.
*
* @var boolean
*/
protected $isDestroyed = false;
/**
* {@inheritdoc}
*
* @param array $options
*
* @throws \Phalcon\Session\Exception
*/
public function __construct($options = null)
{
if (!isset($options['db'])) {
throw new Exception("The parameter 'db' is required");
}
if (!isset($options['table'])) {
throw new Exception("The parameter 'table' is required");
}
if (!isset($options['column_session_id'])) {
$options['column_session_id'] = 'session_id';
}
if (!isset($options['column_data'])) {
$options['column_data'] = 'data';
}
if (!isset($options['column_created_at'])) {
$options['column_created_at'] = 'created_at';
}
if (!isset($options['column_modified_at'])) {
$options['column_modified_at'] = 'modified_at';
}
parent::__construct($options);
session_set_save_handler(
array($this, 'open'),
array($this, 'close'),
array($this, 'read'),
array($this, 'write'),
array($this, 'destroy'),
array($this, 'gc')
);
}
/**
* {@inheritdoc}
* @return boolean
*/
public function open()
{
return true;
}
/**
* {@inheritdoc}
* @return boolean
*/
public function close()
{
return false;
}
/**
* {@inheritdoc}
* @param string $sessionId
*
* @return string
*/
public function read($sessionId)
{
$maxlifetime = (int) ini_get('session.gc_maxlifetime');
$options = $this->getOptions();
$row = $options['db']->fetchOne(
sprintf(
'SELECT %s FROM %s WHERE %s = ? AND COALESCE(%s, %s) + %d >= ?',
$options['db']->escapeIdentifier($options['column_data']),
$options['db']->escapeIdentifier($options['table']),
$options['db']->escapeIdentifier($options['column_session_id']),
$options['db']->escapeIdentifier($options['column_modified_at']),
$options['db']->escapeIdentifier($options['column_created_at']),
$maxlifetime
),
Db::FETCH_NUM,
array($sessionId, time())
);
if (empty($row)) {
return '';
}
return $row[0];
}
/**
* {@inheritdoc}
* @param string $sessionId
* @param string $data
*
* @return boolean
*/
public function write($sessionId, $data)
{
if ($this->isDestroyed || empty($data)) {
return false;
}
$options = $this->getOptions();
$row = $options['db']->fetchOne(
sprintf(
'SELECT COUNT(*) FROM %s WHERE %s = ?',
$options['db']->escapeIdentifier($options['table']),
$options['db']->escapeIdentifier($options['column_session_id'])
),
Db::FETCH_NUM,
array($sessionId)
);
if (!empty($row) && intval($row[0]) > 0) {
return $options['db']->execute(
sprintf(
'UPDATE %s SET %s = ?, %s = ? WHERE %s = ?',
$options['db']->escapeIdentifier($options['table']),
$options['db']->escapeIdentifier($options['column_data']),
$options['db']->escapeIdentifier($options['column_modified_at']),
$options['db']->escapeIdentifier($options['column_session_id'])
),
array($data, time(), $sessionId)
);
} else {
return $options['db']->execute(
sprintf(
'INSERT INTO %s (%s, %s, %s, %s) VALUES (?, ?, ?, NULL)',
$options['db']->escapeIdentifier($options['table']),
$options['db']->escapeIdentifier($options['column_session_id']),
$options['db']->escapeIdentifier($options['column_data']),
$options['db']->escapeIdentifier($options['column_created_at']),
$options['db']->escapeIdentifier($options['column_modified_at'])
),
array($sessionId, $data, time())
);
}
}
/**
* {@inheritdoc}
* @return boolean
*/
public function destroy($session_id = null)
{
if (!$this->isStarted() || $this->isDestroyed) {
return true;
}
if (is_null($session_id)) {
$session_id = $this->getId();
}
$this->isDestroyed = true;
$options = $this->getOptions();
$result = $options['db']->execute(
sprintf(
'DELETE FROM %s WHERE %s = ?',
$options['db']->escapeIdentifier($options['table']),
$options['db']->escapeIdentifier($options['column_session_id'])
),
array($session_id)
);
session_regenerate_id();
return $result;
}
/**
* {@inheritdoc}
* @param integer $maxlifetime
*
* @return boolean
*/
public function gc($maxlifetime)
{
$options = $this->getOptions();
return $options['db']->execute(
sprintf(
'DELETE FROM %s WHERE COALESCE(%s, %s) + %d < ?',
$options['db']->escapeIdentifier($options['table']),
$options['db']->escapeIdentifier($options['column_modified_at']),
$options['db']->escapeIdentifier($options['column_created_at']),
$maxlifetime
),
array(time())
);
}
}