MySQL如何设置手动提交

MySQL默认自动提交事务

# 查看mysql自动提交状态
show variables like 'autocommit';

# 开启自动提交
set @@autocommit=1;

# 关闭自动提交
set @@autocommit=0;

启动数据库时，关闭事务自动提交

找到my.ini文件，在[mysqld]下添加autocommit=0

[mysqld]
port=3306
autocommit=0

提示

set autocommit 和 start transaction

1. 不管autocommit 是1还是0 ，start transaction 后，只有当commit数据才会生效，rollback后就会回滚。
2. 当autocommit 为 0 时，不管有没有start transaction。只有当commit数据才会生效，rollback后就会回滚。

C:\Users\djy96>mysql -hlocalhost -uroot -p
Enter password: **********
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 15
Server version: 5.7.22-log MySQL Community Server (GPL)

Copyright (c) 2000, 2018, Oracle and/or its affiliates. All rights reserved.

Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> use network_access;
Database changed
mysql> set autocommit=0;
Query OK, 0 rows affected (0.00 sec)
mysql> start transaction;
Query OK, 0 rows affected (0.00 sec)

mysql> select * from emp where empid=1 for update;
+-------+------+
| empid | name |
+-------+------+
|     1 | djy  |
+-------+------+
1 row in set (0.00 sec)

mysql> commit; | rollback;
Query OK, 0 rows affected (0.00 sec)