USE PlaceholderForDbName;

DROP PROCEDURE IF EXISTS add_user ;

CREATE PROCEDURE add_user()
BEGIN
DECLARE EXIT HANDLER FOR 1044 BEGIN END;
GRANT ALL PRIVILEGES ON PlaceholderForDbName.* to 'PlaceholderForDbUsername'@'localhost' IDENTIFIED BY 'PlaceholderForDbPassword';
FLUSH PRIVILEGES;
END
;

CALL add_user() ;

DROP PROCEDURE IF EXISTS add_user ;