private function sqlsrv_fetch_id() {
        $query_id = sqlsrv_query($this->sqlsrv, 'SELECT SCOPE_IDENTITY()');
        if ($query_id === false) {
            $dberr = $this->get_last_error();
            return false;
        }
        $row = $this->sqlsrv_fetchrow($query_id);
        return (int)$row[0];
    }