Re: raise exception and transaction handling

["Bart Degryse" <Bart(dot)Degryse(at)indicator(dot)be>]

Alternative that always works no matter how many raise exceptions there are:

Create a (perlu) function that opens a second connection to your database and does the insert into m_proba.

Since this is a seperate connection, it's also a seperate transaction and thus not rolled back by your "main" transaction.

>>> "Michal Kedziora" <michalkd(at)o2(dot)pl> 2007-07-29 13:33 >>>

Hi, Marcin

 

I'm not familiar with PREPARE TRANSACTION maby it could be done in that way.

But, you can use a EXCEPTION clause, and there put your insert.

 

IF EXISTS (SELECT 1 FROM g.m_lista WHERE idf = NEW.id) THEN
                    RAISE EXCEPTION 'CENY NIE SPELNIAJA WARUNKOW! %', rtrim(bledne);
END IF;

 

EXCEPTION 
 when RAISE_EXCEPTION then 
     INSERT INTO g.m_proba VALUES (1,2);
END;

 

It will work corect if you have only one RAISE EXCEPTION,becouse RAISE_EXCEPTION concern every exception called by RAISE command.

I hope that will help.

----- Origi

nal Message -----

From: Marcin Krawczyk

To: pgsql-sql(at)postgresql(dot)org

Sent: Saturday, July 28, 2007 10:54 PM

Subject: [SQL] raise exception and transaction handling

Hi,
I have a problem with transaction handling. What I need to do is execute an INSERT command that would not be canceled by the 
RAISE EXCEPTION command in AFTER UPDATE TRIGGER. A piece of code:

BEGIN
-- some computations

bledne := (SELECT g.q_sumka('Poz.' || lps || ' - min. cena: ' || cena || ' ' || waluta ||'; ') FROM g.m_lista WHERE idf = NEW.id);

IF EXISTS (SELECT 1 FROM g.m_lista WHERE idf = NEW.id) THEN
RAISE EXCEPTION 'CENY NIE SPELNIAJA WARUNKOW! %', rtrim(bledne);
BEGIN
INSERT INTO g.m_proba VALUES (1,2); -- this is the operation I need to perform but the RAISE EXCEPTION above cancels it out
PREPARE TRANSACTION 'a';
COMMIT PREPARED 'a';
END;
END IF;

I tried to do it as shown above, with PREPARE and COMMIT but it's not working.