On Fri, Aug 19, 2005 at 02:38:01AM -0300, Marc G. Fournier wrote:
> I have an older PostgreSQL book here, that has chapter on pl/PgSQL in it,
> but no good samples ....
>
> What I'm looking for is a sample of a function that returns # of rows
> updated, so that I can make a decision based on that ... does anyone know
> where I could find such (and others, would be great) online?
Are you looking for GET DIAGNOSTICS?
http://www.postgresql.org/docs/8.0/static/plpgsql-statements.html#PLPGSQL-STATEMENTS-DIAGNOSTICS
CREATE TABLE foo (id integer, name text);
INSERT INTO foo VALUES (1, 'Bob');
INSERT INTO foo VALUES (2, 'Bob');
INSERT INTO foo VALUES (3, 'Jim');
CREATE FUNCTION update_foo(old_name text, new_name text) RETURNS integer AS $$
DECLARE num_rows integer;
BEGIN UPDATE foo SET name = new_name WHERE name = old_name; GET DIAGNOSTICS num_rows = ROW_COUNT; RETURN
num_rows;
END;
$$ LANGUAGE plpgsql VOLATILE STRICT;
SELECT update_foo('Bob', 'Robert');update_foo
------------ 2
(1 row)
SELECT update_foo('Jim', 'James');update_foo
------------ 1
(1 row)
SELECT update_foo('Rick', 'Richard');update_foo
------------ 0
(1 row)
--
Michael Fuhr
