problem with FOUND and EXECUTE in pl/pgsql

Hi there,

seems I don't understand how FOUND variable in pl/pgsql function defined,
when I use EXECUTE of PERFORM. There is no problem when I use plain SQL.
Below is a test I did for 8.4beta2. This is simplified script and I can
use plain SQL, but in my project I need EXECUTE.

CREATE TABLE db (a INT, b TEXT);
INSERTYTT INTO db VALUES(1,'one');

CREATE OR REPLACE FUNCTION merge_db(key INT, data TEXT) RETURNS VOID AS
$$
BEGIN
EXECUTE 'UPDATE db SET b='||quote_literal(data)||' WHERE a='||key;
RAISE NOTICE 'found:%',FOUND;
END;
$$
LANGUAGE plpgsql;

After successfull update I expected TRUE, as with plain INSERT
(instead of EXECUTE), but FOUND is FALSE !

=# SELECT merge_db(1, 'two');
NOTICE: found:f
merge_db
----------

(1 row)
=# select * from db;
a | b
---+-----
1 | two
(1 row)

Regards,
Oleg
_____________________________________________________________
Oleg Bartunov, Research Scientist, Head of AstroNet (www.astronet.ru),
Sternberg Astronomical Institute, Moscow University, Russia
Internet: oleg(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
phone: +007(495)939-16-83, +007(495)939-23-83