MySQL新建用户,受权,撤权，删除用户,修改密码

1.新建用户

方法一（推荐）：

//登陆MYSQL
@>mysql -u root -p
@>密码
//建立用户
CREATE USER 'youruser'@'host' IDENTIFIED BY 'password';

 

: youruser - 你将建立的用户名, host - 指定该用户在哪一个主机上能够登录,若是是本地用户可用localhost, 若是想让该用户能够从任意远程主机登录,能够使用通配符%. password - 该用户的登录密码,密码能够为空,若是为空则该用户能够不须要密码登录服务器.

方法二：
//登陆MYSQL
@>mysql -u root -p
@>密码
//建立用户
mysql> insert into mysql.user(Host,User,Password) values("localhost","phplamp",password("1234"));
//刷新系统权限表
mysql>flush privileges;
这样就建立了一个名为：phplamp  密码为：1234  的用户。

2.为用户受权。

//登陆MYSQL（有ROOT权限）。我里我以ROOT身份登陆.
@>mysql -u root -p
@>密码
//首先为用户建立一个数据库(phplampDB)
mysql>create database phplampDB;

//受权
命令:GRANT privileges ON databasename.tablename TO 'username'@'host'

说明: privileges - 用户的操做权限,如SELECT , INSERT , UPDATE 等.若是要授予所的权限则使用ALL.;databasename - 数据库名,tablename-表名,若是要授予该用户对全部数据库和表的相应操做权限则可用*表示, 如*.*.

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

注意:用以上命令受权的用户不能给其它用户受权,若是想让该用户能够受权,用如下命令:
GRANT privileges ON databasename.tablename TO 'username'@'host' WITH GRANT OPTION;

//刷新系统权限表
mysql>flush privileges;

3.设置与更改用户密码

方法一（推荐）：

命令:SET PASSWORD FOR 'username'@'host' = PASSWORD('newpassword');若是是当前登录用户用SET PASSWORD = PASSWORD("newpassword");

例子: SET PASSWORD FOR 'pig'@'%' = PASSWORD("123456");

 

方法二：

@>mysql -u root -p
@>密码
mysql>update mysql.user set password=password('newpassword') where User="username" and Host="localhost";
mysql>flush privileges;

 

4.撤销用户权限

命令: REVOKE privilege ON databasename.tablename FROM 'username'@'host';

说明: privilege, databasename, tablename - 同受权部分.

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

注意: 假如你在给用户'pig'@'%'受权的时候是这样的(或相似的):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 操做.相反,若是受权使用的是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.

具体信息能够用命令SHOW GRANTS FOR 'pig'@'%'; 查看.

5.删除用户。
方法一（推荐）：

命令: DROP USER 'username'@'host';

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

 

方法二：

@>mysql -u root -p
@>密码
mysql>DELETE FROM mysql.user WHERE User="username" and Host="localhost";
mysql>flush privileges;
//删除用户的数据库
mysql>drop database databasename;

 

附表:在MySQL中的操做权限

 

ALTER	Allows use of ALTER TABLE.
ALTER ROUTINE	Alters or drops stored routines.
CREATE	Allows use of CREATE TABLE.
CREATE ROUTINE	Creates stored routines.
CREATE TEMPORARY TABLE	Allows use of CREATE TEMPORARY TABLE.
CREATE USER	Allows use of CREATE USER, DROP USER, RENAME USER, and REVOKE ALL PRIVILEGES.
CREATE VIEW	Allows use of CREATE VIEW.
DELETE	Allows use of DELETE.
DROP	Allows use of DROP TABLE.
EXECUTE	Allows the user to run stored routines.
FILE	Allows use of SELECT... INTO OUTFILE and LOAD DATA INFILE.
INDEX	Allows use of CREATE INDEX and DROP INDEX.
INSERT	Allows use of INSERT.
LOCK TABLES	Allows use of LOCK TABLES on tables for which the user also has SELECT privileges.
PROCESS	Allows use of SHOW FULL PROCESSLIST.
RELOAD	Allows use of FLUSH.
REPLICATION	Allows the user to ask where slave or master
CLIENT	servers are.
REPLICATION SLAVE	Needed for replication slaves.
SELECT	Allows use of SELECT.
SHOW DATABASES	Allows use of SHOW DATABASES.
SHOW VIEW	Allows use of SHOW CREATE VIEW.
SHUTDOWN	Allows use of mysqladmin shutdown.
SUPER	Allows use of CHANGE MASTER, KILL, PURGE MASTER LOGS, and SET GLOBAL SQL statements. Allows mysqladmin debug command. Allows one extra connection to be made if maximum connections are reached.
UPDATE	Allows use of UPDATE.
USAGE	Allows connection without any specific privileges.