[root@demo /]# mysql -u root -p  #登录服务器数据库

Enter password:123xxx

#1.创建一个新用户 testuser 密码为 testuserpass

CREATE USER 'testuser'@'localhost' IDENTIFIED BY 'testuserpass';

#2.创建数据库testDB

create database testDB;

#3.执行命令为testuser用户添加使用testDB权限

grant all privileges on testDB.* to testuser@localhost identified by 'testuserpass';

#4.执行命令，为testuser用户添加远程访问权限

GRANT ALL PRIVILEGES ON testDB.* TO 'testuser'@'%' IDENTIFIED BY 'testuserpass' WITH GRANT OPTION;

#5.刷新权限表
flush privileges;