Another way to do that is create a temp table from NEW or OLD record and loop over the fields using system catalog.
CREATE TABLE person(id integer, fname text, lname text, birthday date);
CREATE OR REPLACE FUNCTION test_dynamic()
RETURNS trigger
LANGUAGE plpgsql
AS $func$
DECLARE
_field text;
BEGIN
CREATE TEMP TABLE tmp_new AS SELECT NEW.*;
FOR _field IN SELECT column_name FROM information_schema.columns WHERE table_name = 'tmp_new' AND table_schema ~ '^pg_temp' LOOP
RAISE NOTICE '%', _field;
END LOOP;
RETURN NEW;
END;
$func$;
CREATE TRIGGER person_test_trigger BEFORE INSERT
ON person FOR EACH ROW
EXECUTE PROCEDURE test_dynamic();
INSERT INTO person VALUES (1, 'Fabrizio', 'Mello', '1979-08-08');
This example works more then one version of PostgreSQL.
Best regards,
