/**
* Get the session data from database
*
* @param string $sessionid
* @return \stdClass|false if data doesn't exist in database
*/
private function getDbData($sessionid)
{
$select = new Select($this->config['table']);
$select->field('time', 'time')->field('data', 'data')->where('id', $sessionid)->setConnection($this->config['connection']);
return $select->fetchFirstObj();
}