Mysql series (11) exception handling

Mysql Series (11) Exception Handling

DROP PROCEDURE IF EXISTS `SP_MODEL`;
DELIMITER ;;
CREATE PROCEDURE `SP_MODEL`(IN V_TYPE INT)
BEGIN
/**********存储过程模版，结合了·返回自定义错误信息·错误退出··事物回滚·的功能***********/
DECLARE V_TEST INT DEFAULT 0;
DECLARE V_ERR_NO INT DEFAULT 0;
DECLARE V_ERR_MSG VARCHAR(100) DEFAULT '执行成功';
DECLARE CONTINUE HANDLER FOR SQLEXCEPTION,SQLWARNING,NOT FOUND SET V_ERR_NO=1;
-- CREATE TABLE `test_error` (
-- `a` int(11) NOT NULL,
-- `b` int(11) DEFAULT NULL,
-- PRIMARY KEY (`a`)
-- ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
-- TRUNCATE TABLE TEST_ERROR;
-- CALL SP_MODEL(1);
-- SELECT * FROM TEST_ERROR;
START TRANSACTION;
Label:-- 执行过程中出现错误则跳出此Label
BEGIN
IF V_TYPE=1 THEN
INSERT INTO TEST_ERROR(a,b) VALUES(1,1);
INSERT INTO TEST_ERROR(a,b) VALUES(1,1);
IF V_ERR_NO=1 THEN
SET V_ERR_MSG='您已经插过啦，别再重复插~';
-- LEAVE Label;
END IF;
SET V_TEST=1;
INSERT INTO TEST_ERROR(a,b) VALUES(3,'a');
IF V_ERR_NO=1 THEN
SET V_ERR_MSG='尺寸不对，插不进来~';
LEAVE Label;
END IF;
INSERT INTO TEST_ERROR(a,b) VALUES(4,1);
SET V_TEST=2;
ELSE
SET V_ERR_MSG='传入参数V_TYPE不正确';
SET V_ERR_NO=1; -- 直接设置此变量值为1，主动抛出异常
LEAVE Label;
END IF;
END Label;
IF V_ERR_NO=1 THEN
ROLLBACK;
ELSE
COMMIT;
END IF;
SELECT V_ERR_NO AS ERR_NO,V_ERR_MSG AS ERR_MSG, V_TEST AS TEST; -- 返回执行结果
END
;;
DELIMITER ;

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