1、新建用户
创建test用户,密码是1234。

MySQL -u root -p 
CREATE USER 'test'@'localhost'  IDENTIFIED BY '1234'; #本地登录 
CREATE USER 'test'@'%'  IDENTIFIED BY '1234'; #远程登录 
quit 
mysql -u test -p #测试是否创建成功

2、为用户授权

a.授权格式:grant 权限 on 数据库.* to 用户名@登录主机 identified by '密码'; 

b.登录MYSQL,这里以ROOT身份登录:

mysql -u root -p

c.为用户创建一个数据库(testDB):

create database testDB; 
create database testDB default charset utf8 collate utf8_general_ci;

d.授权test用户拥有testDB数据库的所有权限:

grant all privileges on testDB.* to “test”@”localhost” identified by “1234”; 
flush privileges; #刷新系统权限表

e.指定部分权限给用户:

grant select,update on testDB.* to “test”@”localhost” identified by “1234”; 
flush privileges; #刷新系统权限表

f.授权test用户拥有所有数据库的某些权限:  

grant select,delete,update,create,drop on . to test@”%” identified by “1234”; #”%” 表示对所有非本地主机授权,不包括localhost

3、删除用户

mysql -u root -p 
Delete FROM mysql.user Where User=”test” and Host=”localhost”; 
flush privileges; 
drop database testDB;

删除账户及权限:

drop user 用户名@’%’; 
drop user 用户名@ localhost;

4、修改指定用户密码

mysql -u root -p 
update mysql.user set authentication_string=password(“新密码”) where User=”test” and Host=”localhost”; 
flush privileges;