salix/db/routines/vn/functions/entry_getCommission.sql

DELIMITER $$
CREATE OR REPLACE DEFINER=`vn`@`localhost` FUNCTION `vn`.`entry_getCommission`(vTravelFk INT,
	vCurrencyFk INT,
	vSupplierFk INT
)
	RETURNS int(11)
	NOT DETERMINISTIC
	READS SQL DATA
BEGIN
	DECLARE vCommission INT;
	DECLARE vCurrentCommission INT;
	DECLARE vIsNotEUR INT;
	DECLARE vLastEntryFk INT;

	SELECT count(*) INTO vIsNotEUR
			FROM currency c
			WHERE c.code <> 'EUR' AND id = vCurrencyFk;

	IF vIsNotEUR THEN
		SELECT ROUND(-100 * (1 - (1 / r.value))) INTO vCommission
			FROM travel t
				LEFT JOIN referenceCurrent r ON r.currencyFk = vCurrencyFk AND r.`dated` <= t.shipped
			WHERE t.id = vTravelFk
			ORDER BY r.`dated` DESC
			LIMIT 1;

		RETURN IFNULL(vCommission, 0);
	ELSE
		SELECT e.id INTO vLastEntryFk
			FROM `entry` e
				JOIN travel tr ON tr.id = e.travelFk
				WHERE e.supplierFk = vSupplierFk
				ORDER BY tr.landed DESC
				LIMIT 1;

		IF vLastEntryFk THEN
			SELECT commission INTO vCurrentCommission
				FROM `entry`
				WHERE id = vLastEntryFk;

		ELSE
			SELECT commission INTO vCurrentCommission
				FROM supplier s
				WHERE s.id = vSupplierFk;

		END IF;

		RETURN vCurrentCommission;
	END IF;
END$$
DELIMITER ;