Yii2 Bootstrap 3
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<?php
/**
* @link http://www.yiiframework.com/
* @copyright Copyright (c) 2008 Yii Software LLC
* @license http://www.yiiframework.com/license/
*/
namespace yii\web;
use Yii;
use yii\db\Connection;
use yii\db\Query;
use yii\base\InvalidConfigException;
/**
* DbSession extends [[Session]] by using database as session data storage.
*
* By default, DbSession stores session data in a DB table named 'tbl_session'. This table
* must be pre-created. The table name can be changed by setting [[sessionTable]].
*
* The following example shows how you can configure the application to use DbSession:
*
* ~~~
* 'session' => array(
* 'class' => 'yii\web\DbSession',
* // 'db' => 'mydb',
* // 'sessionTable' => 'my_session',
* )
* ~~~
*
* @author Qiang Xue <qiang.xue@gmail.com>
* @since 2.0
*/
class DbSession extends Session
{
/**
* @var Connection|string the DB connection object or the application component ID of the DB connection.
* After the DbSession object is created, if you want to change this property, you should only assign it
* with a DB connection object.
*/
public $db = 'db';
/**
* @var string the name of the DB table that stores the session data.
* The table should be pre-created as follows:
*
* ~~~
* CREATE TABLE tbl_session
* (
* id CHAR(40) NOT NULL PRIMARY KEY,
* expire INTEGER,
* data BLOB
* )
* ~~~
*
* where 'BLOB' refers to the BLOB-type of your preferred DBMS. Below are the BLOB type
* that can be used for some popular DBMS:
*
* - MySQL: LONGBLOB
* - PostgreSQL: BYTEA
* - MSSQL: BLOB
*
* When using DbSession in a production server, we recommend you create a DB index for the 'expire'
* column in the session table to improve the performance.
*/
public $sessionTable = 'tbl_session';
/**
* Initializes the DbSession component.
* This method will initialize the [[db]] property to make sure it refers to a valid DB connection.
* @throws InvalidConfigException if [[db]] is invalid.
*/
public function init()
{
if (is_string($this->db)) {
$this->db = Yii::$app->getComponent($this->db);
}
if (!$this->db instanceof Connection) {
throw new InvalidConfigException("DbSession::db must be either a DB connection instance or the application component ID of a DB connection.");
}
parent::init();
}
/**
* Returns a value indicating whether to use custom session storage.
* This method overrides the parent implementation and always returns true.
* @return boolean whether to use custom storage.
*/
public function getUseCustomStorage()
{
return true;
}
/**
* Updates the current session ID with a newly generated one .
* Please refer to [[http://php.net/session_regenerate_id]] for more details.
* @param boolean $deleteOldSession Whether to delete the old associated session file or not.
*/
public function regenerateID($deleteOldSession = false)
{
$oldID = session_id();
// if no session is started, there is nothing to regenerate
if (empty($oldID)) {
return;
}
parent::regenerateID(false);
$newID = session_id();
$query = new Query;
$row = $query->from($this->sessionTable)
->where(array('id' => $oldID))
->createCommand($this->db)
->queryOne();
if ($row !== false) {
if ($deleteOldSession) {
$this->db->createCommand()
->update($this->sessionTable, array('id' => $newID), array('id' => $oldID))
->execute();
} else {
$row['id'] = $newID;
$this->db->createCommand()
->insert($this->sessionTable, $row)
->execute();
}
} else {
// shouldn't reach here normally
$this->db->createCommand()
->insert($this->sessionTable, array(
'id' => $newID,
'expire' => time() + $this->getTimeout(),
))->execute();
}
}
/**
* Session read handler.
* Do not call this method directly.
* @param string $id session ID
* @return string the session data
*/
public function readSession($id)
{
$query = new Query;
$data = $query->select(array('data'))
->from($this->sessionTable)
->where('[[expire]]>:expire AND [[id]]=:id', array(':expire' => time(), ':id' => $id))
->createCommand($this->db)
->queryScalar();
return $data === false ? '' : $data;
}
/**
* Session write handler.
* Do not call this method directly.
* @param string $id session ID
* @param string $data session data
* @return boolean whether session write is successful
*/
public function writeSession($id, $data)
{
// exception must be caught in session write handler
// http://us.php.net/manual/en/function.session-set-save-handler.php
try {
$expire = time() + $this->getTimeout();
$query = new Query;
$exists = $query->select(array('id'))
->from($this->sessionTable)
->where(array('id' => $id))
->createCommand($this->db)
->queryScalar();
if ($exists === false) {
$this->db->createCommand()
->insert($this->sessionTable, array(
'id' => $id,
'data' => $data,
'expire' => $expire,
))->execute();
} else {
$this->db->createCommand()
->update($this->sessionTable, array('data' => $data, 'expire' => $expire), array('id' => $id))
->execute();
}
} catch (\Exception $e) {
if (YII_DEBUG) {
echo $e->getMessage();
}
// it is too late to log an error message here
return false;
}
return true;
}
/**
* Session destroy handler.
* Do not call this method directly.
* @param string $id session ID
* @return boolean whether session is destroyed successfully
*/
public function destroySession($id)
{
$this->db->createCommand()
->delete($this->sessionTable, array('id' => $id))
->execute();
return true;
}
/**
* Session GC (garbage collection) handler.
* Do not call this method directly.
* @param integer $maxLifetime the number of seconds after which data will be seen as 'garbage' and cleaned up.
* @return boolean whether session is GCed successfully
*/
public function gcSession($maxLifetime)
{
$this->db->createCommand()
->delete($this->sessionTable, '[[expire]]<:expire', array(':expire' => time()))
->execute();
return true;
}
}