On Fri, Mar 10, 2006 at 05:12:53PM -0300, Alejandro Michelin Salomon ( Adinet ) wrote: > I am working in a migration. Im am migrating systems based in mysql to > postgresql. > > I am trying to create a function named IFNULL, to not migrate any ocurrence > of this mysql function in my code. > > The IFNULL function is the same of COALESCE in postgresql. Are you aware of the MySQL Compatibility Functions module? It has IFNULL. http://pgfoundry.org/projects/mysqlcompat/ http://software.newsforge.com/article.pl?sid=05/12/15/1611251&from=rss > This code does not work. > > CREATE OR REPLACE FUNCTION IFNULL( xValor ANY, xPadrao ANY ) > RETURNS ANY AS $$ Change ANY to ANYELEMENT and the code should work. And for something this simple you could use an SQL function: CREATE OR REPLACE FUNCTION ifnull(anyelement, anyelement) RETURNS anyelement AS $$ SELECT COALESCE($1, $2); $$ LANGUAGE sql IMMUTABLE; You'll have to cast one of the arguments if their types can't be determined. test=> SELECT ifnull('abc', 'xyz'); ERROR: could not determine anyarray/anyelement type because input has type "unknown" test=> SELECT ifnull('abc', 'xyz'::text); ifnull -------- abc (1 row) test=> SELECT ifnull(NULL, 'xyz'::text); ifnull -------- xyz (1 row) -- Michael Fuhr
