public function get_recordset($table, array $conditions=null, $sort='', $fields='*', $limitfrom=0, $limitnum=0) {
        list($select, $params) = $this->where_clause($table, $conditions);
        return $this->get_recordset_select($table, $select, $params, $sort, $fields, $limitfrom, $limitnum);
    }