Mysql事务提交和回滚示例

Question

以下 mysql 查询给出以下错误。

查询 -

    set @rollback = 0; 
    start transaction;    
    DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET @rollback = 1;
    INSERT INTO `tablea` (`date`) VALUES (NOW());
    INSERT INTO `tableb` (`date`) VALUES (NOW());
    INSERT INTO `tablec` (`date`) VALUES (NOW());
    IF @rollback THEN
        ROLLBACK;
    ELSE
        COMMIT;
    END IF;

错误:

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'DECLARE CONTINUE HANDLER FOR SQLEXCEPTION SET @rollback = 1' at line 1 

Answer 1

DECLARE 只能用在 BEGIN 和 END 语句之间，只能出现在存储过程、函数、触发器或事件定义中。

参见:http://dev.mysql.com/doc/refman/5.7/en/sql-syntax-compound-statements.html