public function loadGroupDataByIdentifier($identifier)
{
$q = $this->createGroupLoadQuery();
$q->where($q->expr->eq($this->dbHandler->quoteColumn('name'), $q->bindValue($identifier, null, \PDO::PARAM_STR)));
$stmt = $q->prepare();
$stmt->execute();
return $stmt->fetchAll(\PDO::FETCH_ASSOC);
}