Mysql基础第二十九天,管理事务处理

Posted 2021-08-27 2019ab

事务处理

事务处理的术语

// 开启事务
start transaction;
select * from ordertotal;
delete from ordertotals;
rollback; // 回退
start transaction;
delete from ordertime order_num=20011;
delete from orders where order_num=20011;
commit;// 提交 提交之后再回退就不行了
start transaction;
delete from  orderitems where order_num = 2010; 

控制事务处理

savepoint deletel;   // 保留点
delete from orders where order_num=2010;
rollback to deletel; 

更改默认的提交行为

insert into orders values (2030,'2013-9-12',12000);
set autocommit=0;  // 针对连接
insert into orders values (2050,'2013-9-12',1400);
commit;