关于mysql.db和数据库层权限
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1# 数据库层权限记录位置
表级别的权限记录在mysql.tables_priv表中。
([email protected])[mysql]> ([email protected])[mysql]> desc tables_priv;
+-------------+-----------------------------------------------------------------------------------------------------------------------------------+------+-----+-------------------+-----------------------------+
| Field | Type | Null | Key | Default | Extra |
+-------------+-----------------------------------------------------------------------------------------------------------------------------------+------+-----+-------------------+-----------------------------+
| Host | char(60) | NO | PRI | | |
| Db | char(64) | NO | PRI | | |
| User | char(16) | NO | PRI | | |
| Table_name | char(64) | NO | PRI | | |
| Grantor | char(77) | NO | MUL | | |
| Timestamp | timestamp | NO | | CURRENT_TIMESTAMP | on update CURRENT_TIMESTAMP |
| Table_priv | set(‘Select‘,‘Insert‘,‘Update‘,‘Delete‘,‘Create‘,‘Drop‘,‘Grant‘,‘References‘,‘Index‘,‘Alter‘,‘Create View‘,‘Show view‘,‘Trigger‘) | NO | | | |
| Column_priv | set(‘Select‘,‘Insert‘,‘Update‘,‘References‘) | NO | | | |
+-------------+-----------------------------------------------------------------------------------------------------------------------------------+------+-----+-------------------+-----------------------------+
8 rows in set (0.00 sec)然而关于数据库层面的权限记录在mysql.db表中
([email protected])[mysql]> desc db;
+-----------------------+---------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+-----------------------+---------------+------+-----+---------+-------+
| Host | char(60) | NO | PRI | | |
| Db | char(64) | NO | PRI | | |
| User | char(16) | NO | PRI | | |
| Select_priv | enum(‘N‘,‘Y‘) | NO | | N | |
| Insert_priv | enum(‘N‘,‘Y‘) | NO | | N | |
| Update_priv | enum(‘N‘,‘Y‘) | NO | | N | |
| Delete_priv | enum(‘N‘,‘Y‘) | NO | | N | |
| Create_priv | enum(‘N‘,‘Y‘) | NO | | N | |
| Drop_priv | enum(‘N‘,‘Y‘) | NO | | N | |
| Grant_priv | enum(‘N‘,‘Y‘) | NO | | N | |
| References_priv | enum(‘N‘,‘Y‘) | NO | | N | |
| Index_priv | enum(‘N‘,‘Y‘) | NO | | N | |
| Alter_priv | enum(‘N‘,‘Y‘) | NO | | N | |
| Create_tmp_table_priv | enum(‘N‘,‘Y‘) | NO | | N | |
| Lock_tables_priv | enum(‘N‘,‘Y‘) | NO | | N | |
| Create_view_priv | enum(‘N‘,‘Y‘) | NO | | N | |
| Show_view_priv | enum(‘N‘,‘Y‘) | NO | | N | |
| Create_routine_priv | enum(‘N‘,‘Y‘) | NO | | N | |
| Alter_routine_priv | enum(‘N‘,‘Y‘) | NO | | N | |
| Execute_priv | enum(‘N‘,‘Y‘) | NO | | N | |
| Event_priv | enum(‘N‘,‘Y‘) | NO | | N | |
| Trigger_priv | enum(‘N‘,‘Y‘) | NO | | N | |
+-----------------------+---------------+------+-----+---------+-------+
22 rows in set (0.00 sec)
([email protected])[mysql]> select * from dbG
*************************** 1. row ***************************
Host: %
Db: sample
User: test1
Select_priv: Y
Insert_priv: N
Update_priv: N
Delete_priv: N
Create_priv: Y
Drop_priv: N
Grant_priv: N
References_priv: N
Index_priv: N
Alter_priv: N
Create_tmp_table_priv: N
Lock_tables_priv: N
Create_view_priv: N
Show_view_priv: N
Create_routine_priv: N
Alter_routine_priv: N
Execute_priv: N
Event_priv: N
Trigger_priv: N
1 row in set (0.00 sec)这条对应的grant语句是：
([email protected])[mysql]> show grants for test1;
+------------------------------------------------------------------------------------------------------+
| Grants for [email protected]% |
+------------------------------------------------------------------------------------------------------+
| GRANT USAGE ON *.* TO ‘test1‘@‘%‘ IDENTIFIED BY PASSWORD ‘*CFA887C680E792C2DCF622D56FB809E3F8BE63CC‘ |
| GRANT SELECT, CREATE ON `sample`.* TO ‘test1‘@‘%‘ |
| GRANT ALL PRIVILEGES ON `sample`.`smp` TO ‘test1‘@‘%‘ |
| GRANT SELECT ON `mysql`.`user` TO ‘test1‘@‘%‘ |
+------------------------------------------------------------------------------------------------------+
4 rows in set (0.00 sec)第二条：
GRANT SELECT, CREATE ON sample.* TO ‘test1‘@‘%‘
尝试再增加权限：
([email protected])[mysql]> grant all privileges on sample.* to test1;
Query OK, 0 rows affected (0.00 sec)
([email protected])[mysql]>
([email protected])[mysql]>
([email protected])[mysql]> select * from dbG
*************************** 1. row ***************************
Host: %
Db: sample
User: test1
Select_priv: Y
Insert_priv: Y
Update_priv: Y
Delete_priv: Y
Create_priv: Y
Drop_priv: Y
Grant_priv: N
References_priv: Y
Index_priv: Y
Alter_priv: Y
Create_tmp_table_priv: Y
Lock_tables_priv: Y
Create_view_priv: Y
Show_view_priv: Y
Create_routine_priv: Y
Alter_routine_priv: Y
Execute_priv: Y
Event_priv: Y
Trigger_priv: Y
1 row in set (0.00 sec)授予all privileges权限。注意点是grant option并不包含在all privileges里面。可以用with子句
([email protected])[mysql]> grant all privileges on sample.* to test1 with grant option;
Query OK, 0 rows affected (0.00 sec)
([email protected])[mysql]> select * from dbG
*************************** 1. row ***************************
Host: %
Db: sample
User: test1
Select_priv: Y
Insert_priv: Y
Update_priv: Y
Delete_priv: Y
Create_priv: Y
Drop_priv: Y
Grant_priv: Y
References_priv: Y
Index_priv: Y
Alter_priv: Y
Create_tmp_table_priv: Y
Lock_tables_priv: Y
Create_view_priv: Y
Show_view_priv: Y
Create_routine_priv: Y
Alter_routine_priv: Y
Execute_priv: Y
Event_priv: Y
Trigger_priv: Y
1 row in set (0.00 sec)回收all privileges权限, 错误写法，revoke并不能带with grant option来回收grant option
([email protected])[mysql]> revoke all privileges on sample.* from test1 with grant option;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘grant option‘ at line 1
([email protected])[mysql]> 这样写还是不对：
revoke all privileges, grant option on sample.* from test1;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘on sample.* from test1‘ at line 1分开写就可以了：
([email protected])[mysql]> revoke all privileges on sample.* from test1;
Query OK, 0 rows affected (0.00 sec)
([email protected])[mysql]> revoke grant option on sample.* from test1;
Query OK, 0 rows affected (0.00 sec)
([email protected])[mysql]> grant option在授予的时候是用with子句，回收的时候需要单独回收。
2#一般用户可访问的数据库：
在test1用户下，查看可以访问的数据库：
([email protected])[(none)]> show databases
-> ;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| sample |
+--------------------+
3 rows in set (0.00 sec)
([email protected])[(none)]>
([email protected])[(none)]>
([email protected])[(none)]>
([email protected])[(none)]> 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
([email protected])[mysql]> show tables;
+-----------------+
| Tables_in_mysql |
+-----------------+
| user |
+-----------------+
1 row in set (0.00 sec)
([email protected])[mysql]> show grants;
+---------------------------------------------------------------------+
| Grants for [email protected]% |
+---------------------------------------------------------------------+
| GRANT USAGE ON *.* TO ‘test1‘@‘%‘ IDENTIFIED BY PASSWORD <secret> |
| GRANT ALL PRIVILEGES ON `sample`.* TO ‘test1‘@‘%‘ WITH GRANT OPTION |
| GRANT ALL PRIVILEGES ON `sample`.`smp` TO ‘test1‘@‘%‘ |
| GRANT SELECT ON `mysql`.`user` TO ‘test1‘@‘%‘ |
+---------------------------------------------------------------------+
4 rows in set (0.00 sec)-----------------------------------------------------------------+
| Grants for [email protected]% |
+-------------------------------------------------------------------+
| GRANT USAGE ON *.* TO ‘test1‘@‘%‘ IDENTIFIED BY PASSWORD <secret> |
| GRANT ALL PRIVILEGES ON `sample`.`smp` TO ‘test1‘@‘%‘ |
| GRANT SELECT ON `mysql`.`user` TO ‘test1‘@‘%‘ |
+-------------------------------------------------------------------+
3 rows in set (0.00 sec)
([email protected])[mysql]> sample数据库是被授予的all privileges
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