public function getJson()
    {
        global $CFG, $PDOX;

        $row = $PDOX->rowDie("SELECT json FROM {$CFG->dbprefix}{$this->TABLE_NAME}
                WHERE $this->PRIMARY_KEY = :PK",
            array(":PK" => $this->id));
        if ( $row === false ) return false;
        $json = $row['json'];
        if ( $json === null ) return false;
        return $json;
    }