TOP:BEGIN

    #Routine body goes here...

    IF EXISTS

    (

        SELECT * FROM `user` WHERE `name` = in_user_name

    ) THEN

            SELECT - AS RET;

            LEAVE TOP;

    END IF;

  UPDATE `user` SET `name` = in_user_name WHERE `user_id` = in_user_id;

    SELECT  AS RET;

END