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 $$
DECLAREres integer;
BEGINSELECT INTO res extract('month' from now()::integer % 2;IF res == 0 THEN RETURN NULL;ELSE RETURN
(5,5)::foo;ENDIF;
END;
$$ 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 $$
DECLAREres boolean;null_rec foo;
BEGINSELECT INTO res * FROM returns_null_maybe();
IF row(res.*) IS DISTINCT FROM row(null_rec.*) THEN RETURN TRUE;ELSE RETURN FALSE;END IF;
END;
$$ LANGUAGE plpgsql;
Erik Jones
DBA | Emma®
erik@myemma.com
800.595.4401 or 615.292.5888
615.292.0777 (fax)
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