MySQL新建用戶,受權,撤權，刪除用戶,修改密碼

1.新建用戶

方法一（推薦）：

//登陸MYSQL
@>mysql -u root -p
@>密碼
//建立用戶
CREATE USER 'youruser'@'host' IDENTIFIED BY 'password';

 

: youruser - 你將建立的用戶名, host - 指定該用戶在哪一個主機上能夠登錄,若是是本地用戶可用localhost, 若是想讓該用戶能夠從任意遠程主機登錄,能夠使用通配符%. password - 該用戶的登錄密碼,密碼能夠爲空,若是爲空則該用戶能夠不須要密碼登錄服務器.

方法二：
//登陸MYSQL
@>mysql -u root -p
@>密碼
//建立用戶
mysql> insert into mysql.user(Host,User,Password) values("localhost","phplamp",password("1234"));
//刷新系統權限表
mysql>flush privileges;
這樣就建立了一個名爲：phplamp  密碼爲：1234  的用戶。

2.爲用戶受權。

//登陸MYSQL（有ROOT權限）。我裏我以ROOT身份登陸.
@>mysql -u root -p
@>密碼
//首先爲用戶建立一個數據庫(phplampDB)
mysql>create database phplampDB;

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

說明: privileges - 用戶的操做權限,如SELECT , INSERT , UPDATE 等.若是要授予所的權限則使用ALL.;databasename - 數據庫名,tablename-表名,若是要授予該用戶對全部數據庫和表的相應操做權限則可用*表示, 如*.*.

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

注意:用以上命令受權的用戶不能給其它用戶受權,若是想讓該用戶能夠受權,用如下命令:
GRANT privileges ON databasename.tablename TO 'username'@'host' WITH GRANT OPTION;

//刷新系統權限表
mysql>flush privileges;

3.設置與更改用戶密碼

方法一（推薦）：

命令:SET PASSWORD FOR 'username'@'host' = PASSWORD('newpassword');若是是當前登錄用戶用SET PASSWORD = PASSWORD("newpassword");

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

 

方法二：

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

 

4.撤銷用戶權限

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

說明: privilege, databasename, tablename - 同受權部分.

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

注意: 假如你在給用戶'pig'@'%'受權的時候是這樣的(或相似的):GRANT SELECT ON test.user TO 'pig'@'%', 則在使用REVOKE SELECT ON *.* FROM 'pig'@'%';命令並不能撤銷該用戶對test數據庫中user表的SELECT 操做.相反,若是受權使用的是GRANT SELECT ON *.* TO 'pig'@'%';則REVOKE SELECT ON test.user FROM 'pig'@'%';命令也不能撤銷該用戶對test數據庫中user表的Select 權限.

具體信息能夠用命令SHOW GRANTS FOR 'pig'@'%'; 查看.

5.刪除用戶。
方法一（推薦）：

命令: DROP USER 'username'@'host';

//刪除用戶的數據庫
mysql>drop database databasename;

 

方法二：

@>mysql -u root -p
@>密碼
mysql>DELETE FROM mysql.user WHERE User="username" and Host="localhost";
mysql>flush privileges;
//刪除用戶的數據庫
mysql>drop database databasename;

 

附表:在MySQL中的操做權限

 

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.