Re: Test text value as interval

On Thu, 2008-02-07 at 19:37 -0500, Robert Fitzpatrick wrote:
> Been searching for a way to do this, but haven't found what I was hoping
> to find. Is there any way in pl/pgsql to test a text value to see if it
> would be a valid interval without having to try and store in a field? In
> a trigger, I'd like to test a NEW text type field. Right now, I have
> just the following to generate an error...
>
> test := NEW.textfield::interval;
>
> I'd like to test the field and RAISE EXCEPTION if not valid interval.

Trap the error and do what you want with it:

http://www.postgresql.org/docs/8.3/static/plpgsql-control-
structures.html#PLPGSQL-ERROR-TRAPPING

Although: why do you want to generate your own error? It seems like it
would probably be about the same as the error produced by the casting
failure.

Regards,
    Jeff Davis