Re: Trigger (Calling a Procedure)

I got your point.
however, my requirement is something like this.
The trigger shold start another function (a stored procedure) after any
event is fired.

how do I accomplish this goal?

Harpreet

On 8/16/06, Michael Fuhr <mike(at)fuhr(dot)org> wrote:
>
> On Wed, Aug 16, 2006 at 01:35:47AM -0400, Harpreet Dhaliwal wrote:
> > I'm trying to create a trigger with the following definition:
> >
> > CREATE TRIGGER insert_price_change AFTER INSERT OR DELETE OR UPDATE ON
> > raw_email
> > FOR EACH ROW EXECUTE PROCEDURE add_one(1);
> >
> > Procedure / Function add_one has the following definition
> >
> > CREATE FUNCTION add_one(integer) RETURNS integer
> > AS '/usr/local/pgsql/jsb/add_one', 'add_one'
> > LANGUAGE C STRICT;
> >
> > function add_one is running fine.
> >
> > When I try to create the trigger insert_price_change, it throws me the
> > follwoing error:
> >
> > ERROR: function add_one() does not exist
>
> Trigger functions must return type "trigger" and they must be
> declared with no arguments. You can pass an argument as in your
> CREATE TRIGGER statement but a trigger function receives its arguments
> differently than an ordinary function. See the Triggers chapter
> in the documentation, especially "Writing Trigger Functions in C":
>
> http://www.postgresql.org/docs/8.1/interactive/triggers.html
>
> Unless you need to use C I'd suggest using PL/pgSQL. Even if you
> do need to use C I'd recommend practicing with PL/pgSQL to learn
> the basics with a simpler language.
>
> http://www.postgresql.org/docs/8.1/interactive/plpgsql-trigger.html
>
> --
> Michael Fuhr
>