salix/db/routines/vn/procedures/ticketRefund_beforeUpsert.sql

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DELIMITER $$
CREATE OR REPLACE DEFINER=`root`@`localhost` PROCEDURE `vn`.`ticketRefund_beforeUpsert`(vRefundTicketFk INT, vOriginalTicketFk INT)
BEGIN
DECLARE vAlreadyExists BOOLEAN DEFAULT FALSE;
IF vRefundTicketFk = vOriginalTicketFk THEN
CALL util.throw('Original ticket and refund ticket has same id');
END IF;
SELECT COUNT(*) INTO vAlreadyExists
FROM ticketRefund
WHERE refundTicketFk = vOriginalTicketFk;
IF vAlreadyExists > 0 THEN
CALL util.throw('This ticket is already a refund');
END IF;
END$$
DELIMITER ;