MySQL中創(chuàng)建用戶(hù)與授權(quán)的實(shí)現(xiàn)方法。

運(yùn)行環(huán)境：widnows xp professional + MySQL5.0

一, 創(chuàng)建用戶(hù)

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

說(shuō)明:username - 你將創(chuàng)建的用戶(hù)名, host - 指定該用戶(hù)在哪個(gè)主機(jī)上可以登陸,如果是本地用戶(hù)可用localhost, 如果想讓該用戶(hù)可以從任意遠(yuǎn)程主機(jī)登陸,可以使用通配符%. password - 該用戶(hù)的登陸密碼,密碼可以為空,如果為空則該用戶(hù)可以不需要密碼登陸mysql服務(wù)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,授權(quán)

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

說(shuō)明: privileges - 用戶(hù)的操作權(quán)限,如SELECT , INSERT , UPDATE 等(詳細(xì)列表見(jiàn)該文最后面).如果要授予所的權(quán)限則使用ALL.;databasename - 數(shù)據(jù)庫(kù)名,tablename-表名,如果要授予該用戶(hù)對(duì)所有數(shù)據(jù)庫(kù)和表的相應(yīng)操作權(quán)限則可用*表示, 如*.*.

例子:

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

注意:用以上命令授權(quán)的用戶(hù)不能給其它用戶(hù)授權(quán),如果想讓該用戶(hù)可以授權(quán),用以下命令:
GRANT privileges ON databasename.tablename TO 'username'@'host' WITH GRANT OPTION;

三.設(shè)置與更改用戶(hù)密碼

命令:SET PASSWORD FOR 'username'@'host' = PASSWORD('newpassword');如果是當(dāng)前登陸用戶(hù)用SET PASSWORD = PASSWORD("newpassword");

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

四.撤銷(xiāo)用戶(hù)權(quán)限

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

說(shuō)明: privilege, databasename, tablename - 同授權(quán)部分.

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

注意: 假如你在給用戶(hù)'pig'@'%'授權(quán)的時(shí)候是這樣的(或類(lèi)似的):GRANT SELECT ON test.user TO 'pig'@'%', 則在使用REVOKE SELECT ON *.* FROM 'pig'@'%';命令并不能撤銷(xiāo)該用戶(hù)對(duì)test數(shù)據(jù)庫(kù)中user表的SELECT 操作.相反,如果授權(quán)使用的是GRANT SELECT ON *.* TO 'pig'@'%';則REVOKE SELECT ON test.user FROM 'pig'@'%';命令也不能撤銷(xiāo)該用戶(hù)對(duì)test數(shù)據(jù)庫(kù)中user表的Select 權(quán)限.（m.fzitv.net 腳本學(xué)堂 ）

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

五.刪除用戶(hù)

命令: DROP USER 'username'@'host';

附表:在MySQL中的操作權(quán)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.

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