MySQL创建用户与授权方法

-- 创建用户 ---单个数据库授权
create user 'testone'@'localhost' identified by '123';
grant all privileges on testone.* to testone ;

-- 创建用户2
create user 'testtwo'@'localhost' identified by '123';

grant all privileges on *.*  to testtwo@'localhost';

grant all privileges on *.*  to testtwo@'localhost';

-- 授予用户 远程访问 （启用远程访问后备份的时候localhost失效）
grant all privileges on *.*  to wlliuxue@'%' identified by '123' with grant option;
flush privileges;

grant all privileges on *.*  to testone@'192.168.1.126' identified by '123' with grant option;
flush privileges;

grant all privileges on *.* to root@'%' identified by '123' with grant option;
flush privileges;

注意：新版本中 TO 'username'@'host' 中单引号是必须的

一, 创建用户:

命令:

CREATE USER 'username'@'host' IDENTIFIED BY 'password';

说明:username
- 你将创建的用户名, host - 指定该用户在哪个主机上可以登陆,如果是本地用户可用localhost, 如果想让该用户可以从任意远程主机登陆,可以使用通配符%. password - 该用户的登陆密码,密码可以为空,如果为空则该用户可以不需要密码登陆服务器.

例子: CREATE USER 'dog'@'localhost' IDENTIFIED BY '123456';
CREATE USER 'pig'@'192.168.1.101_' IDENDIFIED BY '123456';
CREATE USER 'pig'@'%' IDENTIFIED BY '123456';
CREATE USER 'pig'@'%' IDENTIFIED BY '';
CREATE USER 'pig'@'%';

二,授权:

命令:

GRANT privileges ON databasename.tablename TO 'username'@'host'

说明:
privileges - 用户的操作权限,如SELECT , INSERT , UPDATE 等(详细列表见该文最后面).如果要授予所的权限则使用ALL.;databasename - 数据库名,tablename-表名,如果要授予该用户对所有数据库和表的相应操作权限则可用*表示, 如*.*.

例子: GRANT SELECT, INSERT ON test.user TO 'pig'@'%';
GRANT ALL ON *.* TO 'pig'@'%';

注意:用以上命令授权的用户不能给其它用户授权,如果想让该用户可以授权,用以下命令:

GRANT privileges ON databasename.tablename TO 'username'@'host'WITH GRANT OPTION; 

三.设置与更改用户密码

命令:SET PASSWORD FOR 'username'@'host' = PASSWORD('newpassword');
如果是当前登陆用户用SET PASSWORD = PASSWORD("newpassword");
例子: SET PASSWORD FOR 'pig'@'%' = PASSWORD("123456");

四.撤销用户权限

命令: REVOKE privilege ON databasename.tablename FROM 'username'@'host';
说明: privilege, databasename, tablename - 同授权部分.

例子: REVOKE SELECT ON *.* FROM 'pig'@'%';

注意: 假如你在给用户'pig'@'%'授权的时候是这样的(或类似的):GRANT SELECT ON test.user TO 'pig'@'%', 则在使用REVOKE SELECT ON *.* FROM 'pig'@'%';命令并不能撤销该用户对test数据库中user表的SELECT
操作.相反,如果授权使用的是GRANT SELECT ON *.* TO 'pig'@'%';则REVOKE SELECT ON test.user FROM 'pig'@'%';命令也不能撤销该用户对test数据库中user表的Select 权限.

具体信息可以用命令SHOW GRANTS FOR 'pig'@'%'; 查看.

五.删除用户

命令: DROP USER 'username'@'host';