pierre@desertmoon.com wrote:
>
> >
> > I have exactly the same problem as you mentioned in a mail
> > sent to postgres mailing lists about creating trigger using
> > sql function ...
> >
> > Did you get the solution to you problem ?
> >
> > Ph.R.
> >
> >
>
> I actually found the solution in the docs. The solution is to understand
> the difference between triggers and rules. Triggers are used primarily
> to call C/C++ library functions that you can create and add onto the
> postgresql system.
>
> Rules on the other-hand act just like 'triggers' but only call/usr
> sql to perform their functions.
>
> So the solution: Use rules to create trigger-like actions that run
> stored sql procedures. There is a man page on 'create rule' that you
> can use to get more info.
>
> -=pierre
I found out the following trick ... but I m not sure it s clean !
-- Makes all user at least belonging to Void ... just in case
CREATE FUNCTION adduservoid () returns boolean
as 'insert into user_realm
select id as uid,1 as rlid,false as adminuser
from user where not exists (
select uid from user_realm where user.id=user_realm.uid
);
select true as ignore_this;'
language 'sql';
CREATE RULE autoadduservoid as
on insert to user
do select adduservoid();
Ph.R.
--
_____________________________________________________________________
Philippe Rochat, EPFL DI-LBD
Database Laboratory CH-1015 LAUSANNE
Swiss Federal Institute of Technology (EPFL) tel:++41 21 693 52 53
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Private: Grammont, 9 1007 LAUSANNE tel:++41 21 617 03 05
mailto:Philippe.Rochat@epfl.ch, http://lbdwww.epfl.ch/~prochat