final function GetVar($qry, $row_no = 0, $offset = 0)
    {
        if ($this->lock_sel_data) {
            return array();
        }
        if ($this->Query($qry)) {
            $this->result = $this->Fetch($this->query_result, $row_no, $offset);
            $this->SetDebugDump($offset);

            return $this->result[0][0];
        }
        return array();
    }