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 vIsCurrencyUsd INT;
    DECLARE vLastEntryFk INT;
    
    SELECT count(*) INTO vIsCurrencyUsd
            FROM currency c
            WHERE c.code = 'USD' AND id = vCurrencyFk;
    
    IF NOT vIsCurrencyUsd THEN
    
		SELECT e.id INTO vLastEntryFk
			FROM vn.entry e
				JOIN vn.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 vn.entry
                WHERE id = vLastEntryFk;
        
        ELSE
        
			SELECT commission INTO vCurrentCommission
				FROM supplier s
				WHERE s.id = vSupplierFk;
        
		END IF;
        
        RETURN vCurrentCommission;
        
    ELSE

		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);
    
    END IF;
    
END$$
DELIMITER ;