salix/db/routines/vn/triggers/item_afterUpdate.sql

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DELIMITER $$
CREATE OR REPLACE DEFINER=`root`@`localhost` TRIGGER `vn`.`item_afterUpdate`
AFTER UPDATE ON `item`
FOR EACH ROW
BEGIN
IF !(NEW.image <=> OLD.image) THEN
CALL hedera.image_unref('catalog', OLD.image);
CALL hedera.image_ref('catalog', NEW.image);
END IF;
END$$
DELIMITER ;