Mysql用戶管理相關

當前使用的user及host:

mysql> select USER();

+----------------+

| USER()         |

+----------------+

| root@localhost |

+----------------+

1 row in set (0.00 sec)

添加用戶

mysql5以前版本直接使用 INSERT 向 mysql 表中插入mysql用戶了,mysql5之後不可以這樣操作  

mysql> insert into mysql.user(Host,User,Password) values('localhost','test_user',password('123123'));

ERROR 1062 (23000): Duplicate entry 'localhost-test_user' for key 'PRIMARY'

增加用戶 {授予用戶指定數據表許可權 [使用 GRANT 命令 對用戶進行相應授權]}

mysql> GRANT all privileges ON table1.* TO 
'test_user'@'localhost' IDENTIFIED BY '123123' WITH GRANT OPTION;

Query OK, 0 rows affected (0.02 sec)

IDENTIFIED BY 指定用戶的登錄密碼

ALL PRIVILEGES 是表示所有許可權，也可以使用 select、update 等許可權  
*.\  中前面的*號用來指定資料庫名，後面的*號用來指定表名  
TO 表示將許可權賦予某個用戶  
ON 用來指定許可權針對哪些庫和表  
'test_user'@'localhost' 表示test_user用戶，@後面接限制的主機，可以是IP、IP段、功能變數名稱以及%，%表示任何地方  
WITH GRANT OPTION 這個選項表示該用戶可以將自己擁有的許可權授權給別人
 
需要刷新系統許可權表[flush privilege] 該用戶才能生效登錄

mysql> flush privileges;    

刪除用戶

mysql> drop user 'test_user'@'localhost';

查看當前用戶的許可權

mysql> SHOW GRANTS;
+----------------------------------------------------------------------------------------------------------------------------------------+
| Grants for root@localhost                                                                                                              |
+----------------------------------------------------------------------------------------------------------------------------------------+
| GRANT ALL PRIVILEGES ON *.* TO 'root'@'localhost' IDENTIFIED BY PASSWORD '\*E56A114692FE0DE073F9A1DD68A00EEB9703F3F1' WITH GRANT OPTION |
| GRANT PROXY ON ''@'' TO 'root'@'localhost' WITH GRANT OPTION                                                                           |
+----------------------------------------------------------------------------------------------------------------------------------------+

查看某個用戶的許可權

mysql> show grants for 'test_user'@'localhost'
+------------------------------------------------------------------------------------------------------------+
| Grants for test_user@localhost                                                                                   |
+------------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'test_user'@'localhost' IDENTIFIED BY PASSWORD '\*E56A114692FE0DE073F9A1DD68A00EEB9703F3F1' |
| GRANT ALL PRIVILEGES ON table1.* TO 'test_user'@'localhost' WITH GRANT OPTION                                 |
+------------------------------------------------------------------------------------------------------------+

對賬戶重命名

mysql> rename user 'test_user'@'localhost' to 'bb'@'localhost';

修改密碼

1.用set password命令  

mysql> SET PASSWORD FOR 'test_user'@'localhost' = PASSWORD('123456');

2.用 mysqladmin [進入bin目錄]   
備註:{格式: mysqladmin -u用戶名 -p舊密碼 password 新密碼]

/usr/bin$ mysqladmin -utest_user -p123456 password 123123
mysqladmin: Can't turn off logging; error: 'Access denied; you need (at least one of) the SUPER privilege(s) for this operation'

3.用 update 直接編輯 user 表  

mysql> use mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> update user set PASSWORD = PASSWORD('123123') where user = 'test_user';
Query OK, 1 row affected (0.04 sec)
Rows matched: 1  Changed: 1  Warnings: 0