From: Owen Jacobson <ojacobson@osl.com>
To: pgsql-sql@postgresql.org
Subject: Re: OUT parameter
Date: Wed, 22 Mar 2006 14:39:13 -0800
Message-ID: <144D12D7DD4EC04F99241498BB4EEDCC25EAD1@nelson.osl.com> (raw)
Daniel Caune wrote:
> Is there any suggestion against using OUT parameter for local
> calculation such as using a local variable?
>
> CREATE OR REPLACE FUNCTION foo(a IN int,
> b1 OUT int,
> b2 OUT int)
> AS $$
> BEGIN
> FOR (...) LOOP
> b1 = (...);
> b2 = (...);
> END LOOP;
> END;
> $$ LANGUAGE PLPGSQL;
I'd say there's no problem with this, PROVIDED you can ensure you'll never abort before completing the computation. It's not a good idea to modify out parameters partway; programmers (myself included) have this nasty habit of assuming, rightly or wrongly, that a failed function call won't have destroyed the parameters.
If you can't ensure you'll always complete, use locals.
-Owen
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To: pgsql-sql@postgresql.org
Cc: ojacobson@osl.com
Subject: Re: OUT parameter
In-Reply-To: <144D12D7DD4EC04F99241498BB4EEDCC25EAD1@nelson.osl.com>
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