Re: Trigger error - Mailing list pgsql-general

----- "sub_woofer" <tqzelijah@yahoo.co.uk> wrote:

> Hi All
>
> Its been some time since I did any work using triggers/pgsql and when
> I did,
> it was pretty much basic stuff. Ive now returned to developing apps
> using
> postgres and have run into an error when using a trigger that I wrote
> a few
> years back (which worked fine then) but doesnt seem to work anymore! I
> must
> have changed something (?) but can't remb what!
>
> When I try to insert a record into a table called "stage" which should
> then
> fire my trigger i get the following error message:
>
> org.postgresql.util.PSQLException: ERROR: record "old" is not assigned
> yet
> Detail: The tuple structure of a not-yet-assigned record is
> indeterminate.
>
>
> Here is the code for the trigger:-
>
> CREATE OR REPLACE FUNCTION createstagesubjectlisting()
> RETURNS "trigger" AS
> $BODY$
>
>
> Declare
>
> Begin
> IF (((TG_OP = 'INSERT') AND (new.subjects=TRUE)) OR ((TG_OP='UPDATE')
> AND
> (new.subjects=TRUE) AND (old.subjects=FALSE))) THEN

An INSERT tuple does not have OLD record. You might be running into problems with your parentheses and operator
precedence.I usually find it easier to follow by doing the TG_OP in IF,ELSEIF: 

IF TG_OP = 'INSERT'
ELSIF TG_OP = 'UPDATE'
ELSIF TG_OP ='DELETE'

with the appropriate statements nested in each .

>
> Insert into subsperstage(stageid, subno) VALUES (new.stageid, 10);
> Insert into subsperstage(stageid, subno) VALUES (new.stageid, 20);
> Insert into subsperstage(stageid, subno) VALUES (new.stageid, 30);
> Insert into subsperstage(stageid, subno) VALUES (new.stageid, 40);
> Insert into subsperstage(stageid, subno) VALUES (new.stageid, 50);
> Insert into subsperstage(stageid, subno) VALUES (new.stageid, 100);
> Insert into subsperstage(stageid, subno) VALUES (new.stageid, 200);
> Insert into subsperstage(stageid, subno) VALUES (new.stageid, 300);
> Insert into subsperstage(stageid, subno) VALUES (new.stageid, 400);
> Insert into subsperstage(stageid, subno) VALUES (new.stageid, 500);
> Insert into subsperstage(stageid, subno) VALUES (new.stageid, 1000);
> END IF;
>
> IF ((TG_OP='UPDATE') AND (new.subjects=FALSE) AND (old.subjects=true))
> THEN
> DELETE FROM subsperstage where stageid=old.stageid;
> end if;
> Return NULL;
>
> END;
>
> $BODY$
> LANGUAGE 'plpgsql' VOLATILE;
> ALTER FUNCTION createstagesubjectlisting() OWNER TO postgres;
>
>
> the trigger on table:
>
> CREATE TRIGGER createstagesubjectlisting
> AFTER INSERT OR UPDATE
> ON stage
> FOR EACH ROW
> EXECUTE PROCEDURE createstagesubjectlisting();
>
>
> Removing the trigger everything works fine - records get inserted into
> my
> stage table, but having the trigger results in no data being inserted
> in my
> stage table or the trigger being fired.
>
> Any ideas???
>
>
> Thanks in advance
>
> t.


Adrian Klaver
aklaver@comcast.net