詳細(xì)說明mysql5.7創(chuàng)建用戶授權(quán)刪除用戶撤銷授權(quán)的示例代碼

一, 創(chuàng)建用戶:

命令:

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

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

例子:

 CREATE USER 'dog'@'localhost' IDENTIFIED BY 'password';
    CREATE USER 'pig'@'192.168.1.100' IDENDIFIED BY 'password';
    CREATE USER 'pig'@'192.168.1.%' IDENDIFIED BY 'password';
    CREATE USER 'pig'@'%' IDENTIFIED BY 'password';
    CREATE USER 'pig'@'%' IDENTIFIED BY '';
    CREATE USER 'pig'@'%';

二,授權(quán):

命令:

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

說明: privileges - 用戶的操作權(quán)限,如SELECT , INSERT , UPDATE 等(詳細(xì)列表見該文最后面).如果要授予所的權(quán)限則使用ALL.;databasename - 數(shù)據(jù)庫名,tablename-表名,如果要授予該用戶對所有數(shù)據(jù)庫和表的相應(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)的用戶不能給其它用戶授權(quán),如果想讓該用戶可以授權(quán),用以下命令:

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

權(quán)限信息用user、db、host、tables_priv和columns_priv表被存儲(chǔ)在MySQL數(shù)據(jù)庫中(即在名為mysql的數(shù)據(jù)庫中)。

權(quán)限 列 Context

select Select_priv 表

insert Insert_priv 表

update Update_priv 表

delete Delete_priv 表

index Index_priv 表

alter Alter_priv 表

create Create_priv 數(shù)據(jù)庫、表或索引

drop Drop_priv 數(shù)據(jù)庫或表

grant Grant_priv 數(shù)據(jù)庫或表

references References_priv 數(shù)據(jù)庫或表

reload Reload_priv 服務(wù)器管理

shutdown Shutdown_priv 服務(wù)器管理

process Process_priv 服務(wù)器管理

file File_priv 在服務(wù)器上的文件存取

三.設(shè)置與更改用戶密碼

命令:

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

例子:

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

四.撤銷用戶權(quán)限

命令:

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

說明: 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'pig'@'%'授權(quán)的時(shí)候是這樣的(或類似的):GRANT SELECT ON test.user TO 'pig'@'%', 則在使用REVOKE SELECT ON *.* FROM 'pig'@'%';命令并不能撤銷該用戶對test數(shù)據(jù)庫中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'@'%';命令也不能撤銷該用戶對test數(shù)據(jù)庫中user表的Select 權(quán)限.

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

五.刪除用戶

命令:

DROP USER 'username'@'host';

六 查看用戶的授權(quán)

mysql> show grants for 'test01'@'localhost';
+--------------------------------------------------------------------------------------------------------------------------------------------+
  Grants for test01@localhost                                                   
+--------------------------------------------------------------------------------------------------------------+
  GRANT USAGE ON *.* TO 'test01'@'localhost'                                               
  GRANT INSERT, UPDATE, DELETE, CREATE, DROP, REFERENCES, INDEX, ALTER, CREATE TEMPORARY TABLES, LOCK TABLES, 
EXECUTE, CREATE VIEW, SHOW VIEW, CREATE ROUTINE, ALTER ROUTINE, EVENT, TRIGGER ON `test001`.* TO 'test01'@'localhost'  
+--------------------------------------------------------------------------------------------------------------------------------------------+
2 rows in set (0.01 sec)
mysql> show grants for 'test02'@'localhost'; 
+-------------------------------------------------------------+
  Grants for test02@localhost          
+-------------------------------------------------------------+
  GRANT USAGE ON *.* TO 'test02'@'localhost'      
  GRANT ALL PRIVILEGES ON `test001`.* TO 'test02'@'localhost'  
+-------------------------------------------------------------+
2 rows in set (0.00 sec)

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