DO $$ 
    BEGIN 
        DeclARE idRow integer;
        BEGIN
            idRow = 0;
            UPDATE user set age = 22,date_inscription =  '2018-01-30' where id = 154 RETURNING id into idRow;
            IF idRow <> 0 THEN
                RAISE NOTICE 'INFO : MESSAGE REQUEST IS OK ';
            END IF;
        EXCEPTION
            WHEN OTHERS THEN NULL;
        END;
END;
$$

任何人都可以解释上面两行代码的作用吗？