mysql的事务

目录

事务的操作

事务的隔离级别操作

---

事务的操作

create database if not exists mydb12_transcation;
use mydb12_transcation;
-- 创建账户表
create table account(
    id int primary key, -- 账户id
    name varchar(20), -- 账户名
    money double -- 金额
);
 
 
--  插入数据
insert into account values(1,'zhangsan',1000);
insert into account values(2,'lisi',1000);
 
 
-- 设置MySQL的事务为手动提交(关闭自动提交)
select @@autocommit;
set autocommit = 0;
 
-- 模拟账户转账
-- 开启事务 
begin;
update account set money = money - 200 where name = 'zhangsan';
update account set money = money + 200 where name = 'lisi';
-- 提交事务
commit;
 
 
-- 如果转账中的任何一条出现问题，则回滚事务
rollback;

事务的隔离级别操作

-- 查看隔离级别 
show variables like '%isolation%’; 

-- 设置隔离级别
/*
set session transaction isolation level 级别字符串
级别字符串：read uncommitted、read committed、repeatable read、serializable
*/
-- 设置read uncommitted
set session transaction isolation level read uncommitted;
 
-- 设置read committed
set session transaction isolation level read committed;
 
-- 设置repeatable read
set session transaction isolation level repeatable read;
 
-- 设置serializable
set session transaction isolation level serializable;