MySQL create user and authorization management

MySQL create user and authorization management

1. Create a user

• Order

CREATE USER 'username'@'host' IDENTIFIED BY 'password';

• illustrate

username：创建的用户名
host：指定该用户在哪个主机上可以登陆，如果是本地用户可用localhost，如果想让该用户可以从任意远程主机登陆，可以使用通配符%
password：该用户的登陆密码，密码可以为空，如果为空则该用户可以不需要密码登陆服务器

• example

CREATE USER 'admin'@'localhost' IDENTIFIED BY '123456';
CREATE USER 'admin'@'192.168.1.101' IDENDIFIED BY '123456';
CREATE USER 'admin'@'%' IDENTIFIED BY '123456';
CREATE USER 'admin'@'%' IDENTIFIED BY '';
CREATE USER 'admin'@'%';

2. User authorization

• Order

GRANT privileges ON databasename.tablename TO 'username'@'host'

• illustrate

privileges：待授予的用户操作权限，如SELECT，INSERT，UPDATE等，如果要授予所有权限则使用ALL
databasename：数据库名
tablename：表名，如果要授予该用户对所有数据库和表的相应操作权限则可用*表示，如*.*

• example

GRANT SELECT, INSERT ON test.user TO 'admin'@'%';
GRANT ALL ON *.* TO 'admin'@'%';
GRANT ALL ON test.* TO 'admin'@'%';

Note: The user authorized by the above command cannot authorize other users. If you want the user to be authorized, use the following command:

GRANT privileges ON databasename.tablename TO 'username'@'host' WITH GRANT OPTION;

3. Set and change password

• Order

ALTER USER 'username'@'host' IDENTIFIED BY "newpassword"
# 或者
SET PASSWORD FOR 'username'@'host' = "newpassword";
# 如果更改的是当前登录用户密码，还可以直接使用以下命令
SET PASSWORD = "newpassword";

• example

ALTER USER 'admin'@'localhost' IDENTIFIED BY "123456"
ALTER USER 'admin'@'%' IDENTIFIED BY "123456"
SET PASSWORD FOR 'admin'@'localhost' = "123456";
SET PASSWORD = "123456";

4. Revoke user permissions

• Order

REVOKE privileges ON databasename.tablename FROM 'username'@'host';

• illustrate

privileges：待撤销的用户操作权限，如SELECT，INSERT，UPDATE等，如果要撤销所有权限则使用ALL
databasename：数据库名
tablename：表名，如果要撤销该用户对所有数据库和表的相应操作权限则可用*表示，如*.*

• example

REVOKE SELECT ON test.user FROM 'admin'@'%';
REVOKE SELECT,UPDATE ON test.user FROM 'admin'@'%';
REVOKE ALL ON test.user FROM 'admin'@'%';
REVOKE INSERT ON *.* FROM 'admin'@'localhost';

5. Delete user

• Order

DROP USER 'username'@'host';

• example

DROP USER 'admin'@'localhost';
DROP USER 'admin'@'%';