方法1 ：使用mysql root（root权限)用户登陆直接赋权也能够创建用户
/usr/bin/mysqladmin -u root password 123456
mysql -uroot -p
password
查看全部username与password
select host ,user ,password from user;
grant all on ec.* to 'root'@'%' identified by '123456';
grant all privileges on ec.* to 'cockpit'@'%' identified by '123456';
grant all on ec.* to 'cockpit'@'%' identified by '123456';
grant all privileges on ec.* to 'cockpit'@'%' identified by '123456';
flush privileges;;
更改数据库password
user mysql
改动mysql数据库的password
UPDATE user SET Password=PASSWORD('123456') where USER='root';
mysql rootpassword为空 登陆的时候不须要password
UPDATE user SET Password=PASSWORD(null) where USER='root';
flush privileges;
方法二：
1.新建用户。
//登录MYSQL
@>mysql -u root -p
@>password
//首先为用户创建一个数据库(testDB)
mysql>create database testDB default character set utf8;;
//创建用户
mysql> insert into mysql.user(Host,User,Password) values("localhost","test",password("1234"));
//刷新系统权限表
mysql>flush privileges;
这样就创建了一个名为：test password为：1234 的用户。
然后登录一下。
mysql>exit;
@>mysql -u phplamp -p
@>输入password
mysql>登录成功
2.为用户授权。
格式：grant 权限 on 数据库.* to username@登录主机 identified by "password";
>grant all privileges on phplampDB.* to phplamp@localhost identified by '1234";
授权test用户拥有全部数据库的某些权限：
mysql>grant select,delete,update,create,drop on *.* to test@"%" identified by "1234";
//test用户对全部数据库都有select,delete,update,create,drop 权限。
//@"%" 表示对全部非本地主机授权。不包含localhost。（localhost地址设为127.0.0.1。假设设为真实的本地地址，不知道能否够，没有验证。）
3.删除用户。
@>mysql -u root -p
@>password
mysql>DELETE FROM user WHERE User="test" and Host="localhost";
mysql>flush privileges;
//删除用户的数据库
mysql>drop database testDB;
4.改动指定用户password。
@>mysql -u root -p
@>password
mysql>update mysql.user set password=password('新密码') where User="test" and Host="localhost";
mysql>flush privileges;
delete from user where User="test" and Host="localhost";
也能够试试：
删除账户及权限：>drop user username@'%';
>drop user username@ localhost;