2010/8/28 Dmitriy Igrishin <dmitigr@xxxxxxxxx>
Hey Michael,
As of PostgreSQL 9.0 you can do it from PL/pgSQL by
using hstore module
(http://www.postgresql.org/docs/9.0/static/hstore.html)
I wrote an example for you:
<cut>
�
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 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;
�$func$;
� END LOOP;
� RETURN NEW;
END;
�$func$;
CREATE TRIGGER person_test_trigger BEFORE INSERT
� ON person FOR EACH ROW
� EXECUTE PROCEDURE test_dynamic();
� 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,
