我期待在出现错误时使用事务和回滚(例如重复键或其他)。
当我禁用自动提交并且出现错误时,事务已被提交,即使它们不应该提交。
这是我的代码:
CREATE TABLE `Users` (
`user_id` int(11) DEFAULT NULL,
PRIMARY KEY (`user_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
CREATE TABLE `Miscs` (
`misc_id` int(11) DEFAULT NULL,
PRIMARY KEY (`misc_id`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8;
SET @@AUTOCOMMIT = 0;
BEGIN;
INSERT INTO Miscs ( misc_id ) VALUES('1');
INSERT INTO Users ( user_id ) VALUES('1');
INSERT INTO Miscs ( misc_id ) VALUES('2');
COMMIT;
BEGIN;
INSERT INTO Miscs ( misc_id ) VALUES('3');
INSERT INTO Users ( user_id ) VALUES('2');
INSERT INTO Miscs ( misc_id ) VALUES('4');
COMMIT;
BEGIN;
INSERT INTO Miscs ( misc_id ) VALUES('5');
INSERT INTO Users ( user_id ) VALUES('1');
-- should stop, rollback the transaction and skip to the next/last
INSERT INTO Miscs ( misc_id ) VALUES('6');
COMMIT;
-- last transaction
BEGIN;
INSERT INTO Miscs ( misc_id ) VALUES('7');
INSERT INTO Users ( user_id ) VALUES('4');
INSERT INTO Miscs ( misc_id ) VALUES('8');
COMMIT;
SET @@AUTOCOMMIT = 1;
但结果很奇怪:
Users :
1
2
3
Miscs :
1
2
3
4
5
6
7
8
感谢您的帮助。
最佳答案
在应用程序中我会写这样的东西 -
START TRANSACTION
TRY
INSERT
INSERT
INSERT
COMMIT
CATCH
ROLLBACK
但是MySQL没有TRY-CATCH子句。我可以这样建议你,使用 DECLARE EXIT HANDLER声明-
BEGIN
DECLARE EXIT HANDLER FOR SQLEXCEPTION ROLLBACK;
START TRANSACTION;
INSERT INTO Miscs ( misc_id ) VALUES('1');
INSERT INTO Users ( user_id ) VALUES('1');
INSERT INTO Miscs ( misc_id ) VALUES('2');
COMMIT;
END;
BEGIN
DECLARE EXIT HANDLER FOR SQLEXCEPTION ROLLBACK;
START TRANSACTION;
INSERT INTO Miscs ( misc_id ) VALUES('3');
INSERT INTO Users ( user_id ) VALUES('2');
INSERT INTO Miscs ( misc_id ) VALUES('4');
COMMIT;
END;
BEGIN
DECLARE EXIT HANDLER FOR SQLEXCEPTION ROLLBACK;
START TRANSACTION;
INSERT INTO Miscs ( misc_id ) VALUES('5');
INSERT INTO Users ( user_id ) VALUES('1');
-- should stop, rollback the transaction and skip to the next/last
INSERT INTO Miscs ( misc_id ) VALUES('6');
COMMIT;
END;
BEGIN
DECLARE EXIT HANDLER FOR SQLEXCEPTION ROLLBACK;
START TRANSACTION;
INSERT INTO Miscs ( misc_id ) VALUES('7');
INSERT INTO Users ( user_id ) VALUES('4');
INSERT INTO Miscs ( misc_id ) VALUES('8');
COMMIT;
END;
从存储过程运行此代码,因为在 MySQL 中不可能在脚本中使用 DECLARE 处理程序。
关于MySQL 重复键回滚,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10602866/