登录MySQL

mysql -u root -p 

添加新用户

允许本地 IP 访问 localhost, 127.0.0.1

create user 'test'@'localhost' identified by '123456';

允许外网 IP 访问

create user 'test'@'%' identified by '123456';

刷新授权

flush privileges; 

为用户创建数据库

create database test DEFAULT CHARSET utf8 COLLATE utf8_general_ci;

为新用户分配权限

授予用户通过外网IP对于该数据库的全部权限

grant all privileges on `testdb`.* to 'test'@'%' identified by '123456';

授予用户在本地服务器对该数据库的全部权限

 
grant all privileges on `testdb`.* to 'test'@'localhost' identified by '123456'; 

刷新权限

flush privileges;