Re: Function result using execute

On Dec 11, 2007, at 11:15 PM, Paul Lambert wrote:

> I have a function which uses execute to populate the value of a
> variable based on a defined select construct.
>
> The relevant part of the code looks like thus:
>    EXECUTE curr_query INTO curr_amount;
>    RAISE NOTICE '%',curr_amount;
>    IF NOT FOUND THEN
>       curr_amount=0;
>    END IF;
>    RAISE NOTICE '%',curr_amount;
>
> I've added the if found to trap if nothing is returned by the
> execute so that the value gets set to a default 0 rather than null.
>
> When I call the function, the first raise notice gives me a value
> that is correct based on the select it would be performing, but the
> second raise notice gives me a 0, which suggests to me that
> although the execute has populated the curr_amount field with
> something, the IF NOT FOUND is always firing.
>
> Am I misunderstanding what the FOUND variable can be used for -
> i.e. is it not compatible with/not set by the EXECUTE command and
> should therefore I just be using a test of IF curr_amount IS NOT NULL?

If the result of your execute doesn't assign any value(s) to
curr_amount it sets it to NULL.  With that in mind,

IF curr_amount IS NULL THENcurr_amount := 0;
END IF;

should do.

Erik Jones

Software Developer | Emma®
erik@myemma.com
800.595.4401 or 615.292.5888
615.292.0777 (fax)

Emma helps organizations everywhere communicate & market in style.
Visit us online at http://www.myemma.com