Handy user/group hack

Kind people,

Here's something I came up with for finding whether a PostgreSQL 7.4
user is in a group.

Cheers,
D

CREATE OR REPLACE FUNCTION in_group (text, text) RETURNS BOOLEAN AS '
DECLARE   the_user  ALIAS FOR $1;   the_group ALIAS FOR $2;   dummy text; -- SELECT INTO dummy because PERFORM always returns true.               -- Is this a bug?
BEGIN   SELECT INTO dummy u.usename   FROM     pg_user u   , pg_group g   WHERE       u.usename = the_user   AND g.groname = the_group   AND u.usesysid = ANY (g.grolist);
   IF FOUND   THEN       RETURN true;   ELSE       RETURN false;   END IF;
END;
' LANGUAGE 'plpgsql' STRICT IMMUTABLE;
-- 
David Fetter david@fetter.org http://fetter.org/
phone: +1 510 893 6100    cell: +1 415 235 3778