mysql事务-在任何异常时回滚 [英] mysql transaction - roll back on any exception

问题描述

如果mysql命令列表上发生任何错误，是否可以自动回滚?

Is it possible to roll back automatically if any error occurs on a list of mysql commands?

例如以下内容:

begin transaction;

insert into myTable values1 ...
insert into myTable values2 ...;  -- will throw an error

commit;

现在，在执行时，我希望整个事务失败，因此，我应该不看到myTable中的values1. 但不幸的是，即使交易出错，该表也仍使用values1进行伪造.

now, on execute i want the whole transaction to fail, and therefore i should NOT see values1 in myTable. but unfortunately the table is being pupulated with values1 even though the transaction has errors.

我如何使其回滚的任何想法? (再次出现任何错误)?

any ideas how i make it to roll back? (again, on any error)?

编辑-从DDL更改为标准SQL

EDIT - changed from DDL to standard SQL

推荐答案

您可以使用 13.6.7.2.通过以下方式进行DECLARE ... HANDLER语法:

DELIMITER $$

CREATE PROCEDURE `sp_fail`()
BEGIN
    DECLARE `_rollback` BOOL DEFAULT 0;
    DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET `_rollback` = 1;
    START TRANSACTION;
    INSERT INTO `tablea` (`date`) VALUES (NOW());
    INSERT INTO `tableb` (`date`) VALUES (NOW());
    INSERT INTO `tablec` (`date`) VALUES (NOW()); -- FAIL
    IF `_rollback` THEN
        ROLLBACK;
    ELSE
        COMMIT;
    END IF;
END$$

DELIMITER ;

有关完整示例，请检查以下 SQL小提琴.

For a complete example, check the following SQL Fiddle.

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