public function openSession($savePath,$sessionName)
	{
		if($this->autoCreateSessionTable)
		{
			$db=$this->getDbConnection();
			$db->setActive(true);
			try
			{
				$db->createCommand()->delete($this->sessionTableName,'expire<:expire',array(':expire'=>time()));
			}
			catch(Exception $e)
			{
				$this->createSessionTable($db,$this->sessionTableName);
			}
		}
		return true;
	}