用戶管理
Mysql的用戶管理包括兩個(gè)部分,用戶名和機(jī)器名,只要其中的一個(gè)不同,那么就是不同的用戶。
一,mysql的權(quán)限類(lèi)型
管理權(quán)限
數(shù)據(jù)庫(kù)的訪問(wèn)權(quán)限
二,一些特殊權(quán)限
ALl和All PRIVILEGE表示的是全部權(quán)限,但是不能將權(quán)限授予其他的用戶
USAGE 表示的是沒(méi)有權(quán)限,不能訪問(wèn)數(shù)據(jù)庫(kù)的任何數(shù)據(jù),但是可以連接到數(shù)據(jù)庫(kù)。還有就是可以查看系統(tǒng)變量。show variables 和show ?status
三,權(quán)限級(jí)別
四,關(guān)于授權(quán)的表
?mysql用戶管理
一,創(chuàng)建和刪除用戶
mysql> select current_user(); ?查詢當(dāng)前的登錄用戶
+----------------+
| current_user() |
+----------------+
| root@localhost |
+----------------+
?創(chuàng)建用戶的時(shí)候沒(méi)有分配任何權(quán)限,%表示的是任何機(jī)器,但是不包括localhost和127.0.0.1
mysql> create user 'chenzhongyang'@'%' identified by '123456';
mysql> create user 'chen'@'127.0.0.1' identified by '123456';
刪除用戶
mysql> drop user 'chenzhongyang'@'%';
Query OK, 0 rows affected (0.04 sec)
[root@test4 /]# mysql -uchen -p123456 -h127.0.0.1
Welcome to the MySQL monitor. ?Commands end with ; or \g.
Your MySQL connection id is 4
Server version: 5.1.70-log Source distribution
Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> select ?user();
+----------------+
| user() ? ? ? ? |
+----------------+
| chen@localhost |
+----------------+
1 row in set (0.01 sec)
剛剛創(chuàng)建的用戶的權(quán)限是usage
mysql> show ?grants;
+-------------------------------------------------------------------------------------------------------------+
| Grants for chen@127.0.0.1 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? |
+-------------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO 'chen'@'127.0.0.1' IDENTIFIED BY PASSWORD '*6BB4837EB74329105EE4568DDA7DC67ED2CA2AD9' |
+-------------------------------------------------------------------------------------------------------------+
1 row in set (0.02 sec)
修改用戶名,這個(gè)時(shí)候密碼和權(quán)限沒(méi)有變化
mysql> rename ?user 'chen'@'127.0.0.1' ?to 'chenzhongyang'@'127.0.0.1';
二,匿名用戶
創(chuàng)建匿名用戶之后,那么任何機(jī)器的任何用戶都可以登錄到mysql,所以這樣很危險(xiǎn)
mysql> insert into user(host,user,password) values('%','','');
Query OK, 1 row affected, 3 warnings (0.17 sec)
mysql> flush privileges; ? 刷新權(quán)限將重新加載user表的內(nèi)容
Query OK, 0 rows affected (0.03 sec)
三,授權(quán)用戶
? 例子如下
mysql> grant select on ?mysql.user to 'chenzhongyang'@'127.0.0.1' ?identified by '123456';
Query OK, 0 rows affected (0.32 sec)
[root@test4 /]# mysql -uchenzhongyang ?-p123456 -h127.0.0.1
Welcome to the MySQL monitor. ?Commands end with ; or \g.
Your MySQL connection id is 5
Server version: 5.1.70-log Source distribution
Copyright (c) 2000, 2013, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
mysql> select host from mysql.user where user='chenzhongyang';
+-----------+
| host ? ? ?|
+-----------+
| 127.0.0.1 |
+-----------+
1 row in set (0.04 sec)
授權(quán)的范圍
回收權(quán)限
資源限制
from:?http://wolfword.blog.51cto.com/4892126/1289384
http://wolfword.blog.51cto.com/4892126/1289453
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