Mysql sets permissions for created users and sets up remote connections

1. Add user
1. Create only allow specified ip connection

create user '新用户名'@'localhost' identified by '密码';

2. Create to allow all ip connections (indicated by wildcard %)

create user '新用户名'@'%' identified by '密码';

2. Authorize new users
1. The basic format is as follows

grant all privileges on 数据库名.表名 to '新用户名'@'指定ip' identified by '新用户密码' ;

For example:
(1) Allow access to all tables under all databases

grant all privileges on *.* to '新用户名'@'指定ip' identified by '新用户密码' ;

(2) The specified table under the specified database

grant all privileges on test.test to '新用户名'@'指定ip' identified by '新用户密码' ;

3. Set user operation permissions
1. Set users to have all permissions, that is, administrators

grant all on *.* to '用户名'@'%';

2. Possess query authority

grant select on *.* to '新用户名'@'指定ip' identified by '新用户密码' WITH GRANT OPTION;

3. Instructions for other operation permissions, select query insert insert delete delete update modify
(1) set the user to have query insert permission

grant select,insert on *.* to '新用户名'@'指定ip' identified by '新用户密码' WITH GRANT OPTION;

(2) Cancel the query permission of user query

REVOKE select ON what FROM '新用户名';

4. Delete user

DROP USER username@localhost;

5. Refresh permissions after modification

FLUSH PRIVILEGES;