Testing for null record in plpgsql

Ok, let's say I have the following:

CREATE TABLE foo (
val1 integer,
val2 integer
);

CREATE OR REPLACE FUNCTION returns_null_maybe()
RETURNS foo AS $$
DECLARE
res integer;
BEGIN
SELECT INTO res extract('month' from now()::integer % 2;

IF res == 0 THEN
RETURN NULL;
ELSE
RETURN (5,5)::foo;
END IF;
END;
$$ LANGUAGE plpgsql;

Now, let's say I want to call this from another function and test the
result to see if I have a null record (null, null),. I've got the
following working but it feels like there should be something much
simpler but I just can't seem to hit on it. Is this it?

CREATE FUNCTION test_null_rec()
RETURNS boolean AS $$
DECLARE
res boolean;
null_rec foo;
BEGIN
SELECT INTO res * FROM returns_null_maybe();

IF row(res.*) IS DISTINCT FROM row(null_rec.*) THEN
RETURN TRUE;
ELSE
RETURN FALSE;
END IF;
END;
$$ LANGUAGE plpgsql;

Erik Jones

DBA | Emma®
erik(at)myemma(dot)com
800.595.4401 or 615.292.5888
615.292.0777 (fax)

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