Re: BUG #7924: Trigger update function don't take correct values

"mv(dot)gonzalez(at)cir(dot)es" <mv(dot)gonzalez(at)cir(dot)es> wrote:

> On table_B appears:
>   id    | situation | when
> --------+-----------+---------------------
>   23    | Started  | 2013-03-08 12:33:35
>   23    | Started  | 2013-03-08 12:33:37
>
> I don't understand why after the second update, the insert done on table_B
> is incorrect, and has the same values that the first one.
>
> I've been looking for some kind of explanation like cache or something, but
> I couldn't find anything.

It helps to provide a self-containted test case like this:

test=# CREATE TABLE table_a (id int PRIMARY KEY, situation text NOT NULL);
CREATE TABLE
test=# INSERT INTO table_a VALUES (23, 'Unknown');
INSERT 0 1
test=# CREATE TABLE table_b (id int NOT NULL, sitation text NOT NULL, "when" timestamptz NOT NULL);
CREATE TABLE
test=# CREATE FUNCTION log_func()
test-#   RETURNS TRIGGER
test-#   LANGUAGE plpgsql
test-# AS $$
test$# BEGIN
test$#   set datestyle to 'sql';
test$#   set datestyle to 'european';
test$#   IF (TG_OP = 'UPDATE' and (OLD.situation!=NEW.situation)) THEN
test$#     INSERT INTO table_B VALUES (OLD.id,NEW.situation,NOW());
test$#   END IF;
test$#   RETURN NULL;
test$# END;
test$# $$;
CREATE FUNCTION
test=# CREATE TRIGGER log_trig
test-#   AFTER UPDATE ON table_a
test-#   FOR EACH ROW EXECUTE PROCEDURE log_func();
CREATE TRIGGER
test=# update table_A set situation='Started' where id='23';
UPDATE 1
test=# select * from table_a;
 id | situation
----+-----------
 23 | Started
(1 row)

test=# select * from table_b;
 id | sitation |              when             
----+----------+--------------------------------
 23 | Started  | 08/03/2013 13:01:08.169213 CST
(1 row)

test=# update table_A set situation='Waiting' where id='23';
UPDATE 1
test=# select * from table_a;
 id | situation
----+-----------
 23 | Waiting
(1 row)

test=# select * from table_b;
 id | sitation |              when             
----+----------+--------------------------------
 23 | Started  | 08/03/2013 13:01:08.169213 CST
 23 | Waiting  | 08/03/2013 13:01:08.179754 CST
(2 rows)

How about showing us yours?

--
Kevin Grittner
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company