mysql權限管理：

mysql的權限控制，首先在user表判斷有沒有權限連，連上后看有沒有全局權限。然后看db表有哪些庫級別的權限。然后看tables_priv表有哪些表級別的權限。最后還可以看有哪些列級別的權限。

mysql權限檢查：1.有沒有權連接上來2.有沒有權執行操作(crud)

服務器是如何判斷用戶有沒有權限連接上來：1.你從哪里來，host2.你是誰，user

3.你的密碼

用戶的這3個信息存儲在mysql數據庫的user表下

mysql> usemysql

mysql> desc user;

mysql> select Host,User from user;+-----------+---------------+

| Host | User |

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

| localhost | mysql.session |mysql.session用戶必須從localhost連接| localhost | mysql.sys |mysql.sys用戶必須從localhost連接| localhost | root |root用戶必須從localhost連接+-----------+---------------+

就算知道用戶名和密碼，但是可以限制ip。

修改user的host域，update user set host="192.168.1.101" where user='root';

flushprivileges; 沖刷權限，

如何修改用戶的密碼：update user set password=passwiord('111111') where user='root'flushprivileges;

mysql庫下有一個db表，

用戶連上來先通過user表，看能不能進來，然后經過db表判斷有沒有某個庫的操作權，然后通過tables_priv判斷有沒有庫下哪個表的權限。//新增一個用戶，grant[權限1，權限2，權限3......] on 哪個庫.哪個表 to 用戶@'host' identified by 'password'常用權限all(所有權限)，creat,drop,insert,delete,update,selectmysql> grant all on *.* to lisi@'127.0.0.1' identified by '111111';

Query OK,0rows affected

mysql> select Host,User from user;+-----------+---------------+

| Host | User |

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

| 127.0.0.1 | lisi |

| localhost | mysql.session |

| localhost | mysql.sys |

| localhost | root |

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

C:\Users\Administrator>mysql -h127.0.0.1 -ulisi -p //用戶lisi登陸

Enter password:******Welcometo the MySQL monitor. Commands end with ; or\g.

Your MySQL connection idis 8Server version:5.7.20MySQL Community Server (GPL)

mysql> select * from user where user='lisi'\G;*************************** 1. row ***************************Host:127.0.0.1

User: lisi

Select_priv: Y

Insert_priv: Y

Update_priv: Y

Delete_priv: Y

Create_priv: Y

Drop_priv: Y

Reload_priv: Y

Shutdown_priv: Y

Process_priv: Y

File_priv: Y

Grant_priv: N

References_priv: Y

Index_priv: Y

Alter_priv: Y

Show_db_priv: Y

Super_priv: Y

Create_tmp_table_priv: Y

Lock_tables_priv: Y

Execute_priv: Y

Repl_slave_priv: Y

Repl_client_priv: Y

Create_view_priv: Y

Show_view_priv: Y

Create_routine_priv: Y

Alter_routine_priv: Y

Create_user_priv: Y

Event_priv: Y

Trigger_priv: Y

Create_tablespace_priv: Y

ssl_type:

ssl_cipher:

x509_issuer:

x509_subject:

max_questions:0max_updates:0max_connections:0max_user_connections:0plugin: mysql_native_password

authentication_string:*FD571203974BA9AFE270FE62151AE967ECA5E0AA

password_expired: N

password_last_changed:2017-12-29 21:30:25password_lifetime:NULLaccount_locked: N1 row in set (0.00sec)//收回權限，revoke all on *.* from lisi@'127.0.0.1',

mysql> revoke all on *.* from lisi@'127.0.0.1';

Query OK,0rows affected

mysql> select * from user where user='lisi'\G;*************************** 1. row ***************************Host:127.0.0.1

User: lisi

Select_priv: N

Insert_priv: N

Update_priv: N

Delete_priv: N

Create_priv: N

Drop_priv: N

Reload_priv: N

Shutdown_priv: N

Process_priv: N

File_priv: N

Grant_priv: N

References_priv: N

Index_priv: N

Alter_priv: N

Show_db_priv: N

Super_priv: N

Create_tmp_table_priv: N

Lock_tables_priv: N

Execute_priv: N

Repl_slave_priv: N

Repl_client_priv: N

Create_view_priv: N

Show_view_priv: N

Create_routine_priv: N

Alter_routine_priv: N

Create_user_priv: N

Event_priv: N

Trigger_priv: N

Create_tablespace_priv: N

ssl_type:

ssl_cipher:

x509_issuer:

x509_subject:

max_questions:0max_updates:0max_connections:0max_user_connections:0plugin: mysql_native_password

authentication_string:*FD571203974BA9AFE270FE62151AE967ECA5E0AA

password_expired: N

password_last_changed:2017-12-29 21:30:25password_lifetime:NULLaccount_locked: N1 row in set (0.00sec)

mysql庫下面的user里面可以檢測能不能登陸，并且里面的權限是全局的，所有庫所有表的。//不是全局授權，而是分庫分表管理權限。grant all on test3.* to lidi@'127.0.0.1'; //給lisi test3庫所有表的所有權限。//針對某個表做授權grant creat,drop,insert,update,select on test3.goods to lisi@'127.0.0.1';//test3庫的goods表做權限控制，//數據庫級別的權限在db表中，表級別的權限在tables_priv表中。

mysql> select * from db \G; //哪個用戶在哪個庫哪個主機有哪些權限*************************** 1. row ***************************Host: localhost

Db: performance_schemaUser: mysql.session

Select_priv: Y

Insert_priv: N

Update_priv: N

Delete_priv: N

Create_priv: N

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*************************** 2. row ***************************Host: localhost

Db: sysUser: mysql.sys

Select_priv: N

Insert_priv: N

Update_priv: N

Delete_priv: N

Create_priv: N

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: Y*************************** 4. row ***************************Host:127.0.0.1Db: test2User: lisi

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: Y4 rows in set (0.00sec)

mysql> select * fromtables_priv \G;*************************** 1. row ***************************Host: localhost

Db: mysqlUser: mysql.session

Table_name:userGrantor: boot@connectinghostTimestamp: 0000-00-00 00:00:00Table_priv:SelectColumn_priv:*************************** 2. row ***************************Host: localhost

Db: sysUser: mysql.sys

Table_name: sys_config

Grantor: root@localhost

Timestamp: 2017-12-25 15:09:21Table_priv:SelectColumn_priv:*************************** 3. row ***************************Host:127.0.0.1Db: test3User: lisi

Table_name: goods

Grantor: root@localhost

Timestamp: 0000-00-00 00:00:00Table_priv:Select,Insert,Update,Create,DropColumn_priv:3 rows in set (0.00sec)//mysql的權限控制可以精確到列，常用的授權項，

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