DELIMITER $$
CREATE OR REPLACE DEFINER=`root`@`localhost` TRIGGER `vn`.`item_beforeUpdate`
	BEFORE UPDATE ON `item`
	FOR EACH ROW
BEGIN
	DECLARE vNewPackingShelve INT;

	SET NEW.editorFk = account.myUser_getId();

	IF ISNULL(NEW.packingShelve) AND NOT ISNULL(NEW.packingOut) THEN
		SELECT NEW.packingOut * vc.shelveVolume / vc.standardFlowerBox
			INTO vNewPackingShelve
			FROM vn.volumeConfig vc;

		SET NEW.packingShelve = vNewPackingShelve;
	END IF;

	IF NEW.itemPackingTypeFk = '' THEN
		SET NEW.itemPackingTypeFk = NULL;
	END IF;
END$$
DELIMITER ;