MySQL存储过程返回多个值

USE yiibaidb;
DROP PROCEDURE IF EXISTS get_order_by_cust;

-- 以下存储过程接受客户编号，并返回发货(shipped)，取消(canceled)，解决(resolved)和争议(disputed)的订单总数。
DELIMITER $$
CREATE PROCEDURE get_order_by_cust(
 IN cust_no INT,
 OUT shipped INT,
 OUT canceled INT,
 OUT resolved INT,
 OUT disputed INT
)
BEGIN
SELECT  COUNT(*) INTO shipped FROM orders WHERE customerNumber=cust_no AND STATUS=shipped;
SELECT  COUNT(*) INTO canceled FROM orders WHERE customerNumber=cust_no AND STATUS=canceled;
SELECT  COUNT(*) INTO resolved FROM orders WHERE customerNumber=cust_no AND STATUS=resolved;
SELECT  COUNT(*) INTO disputed FROM orders WHERE customerNumber=cust_no AND STATUS=disputed;
END $$
DELIMITER;

CALL get_order_by_cust(141,@shipped,@canceled,@resolved,@disputed);

SELECT @shipped,@canceled,@resolved,@disputed;