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HomeDatabaseMysql Tutorialmysql 创建用户及授权_MySQL

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参考:http://zhidao.zgsj.com/article/6/201185171539.shtml

   http://www.cnblogs.com/analyzer/articles/1045072.html

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'@'%';
  或://创建用户
   insert into mysql.user(Host,User,Password) values("localhost","phplamp",password("1234"));


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.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;
    刷新系统权限表
     flush privileges;


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");

  或:update mysql.user set password=password('新密码') where User="phplamp" and Host="localhost";

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';

  或:DELETE FROM user WHERE User="phplamp" and Host="localhost";

  //删除用户的数据库
  mysql>drop database phplampDB;

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