• MySQL 查看用户授予的权限

     

    在MySQL中，如何查看一个用户被授予了那些权限呢？ 授予用户的权限可能分全局层级权限、数据库层级权限、表层级别权限、列层级别权限、子程序层级权限。具体分类如下：

     

     

    全局层级

     

    全局权限适用于一个给定服务器中的所有数据库。这些权限存储在mysql.user表中。GRANT ALL ON *.*和REVOKE ALL ON *.*只授予和撤销全局权限。

     

    数据库层级

     

    数据库权限适用于一个给定数据库中的所有目标。这些权限存储在mysql.db和mysql.host表中。GRANT ALL ON db_name.*和REVOKE ALL ON db_name.*只授予和撤销数据库权限。

        

    表层级

     

    表权限适用于一个给定表中的所有列。这些权限存储在mysql.tables_priv表中。GRANT ALL ON db_name.tbl_name和REVOKE ALL ON db_name.tbl_name只授予和撤销表权限。

     

    列层级

     

    列权限适用于一个给定表中的单一列。这些权限存储在mysql.columns_priv表中。当使用REVOKE时，您必须指定与被授权列相同的列。

     

    子程序层级

     

    CREATE ROUTINE, ALTER ROUTINE, EXECUTE和GRANT权限适用于已存储的子程序。这些权限可以被授予为全局层级和数据库层级。而且，除了CREATE ROUTINE外，这些权限可以被授予为子程序层级，并存储在mysql.procs_priv表中。

     

     

     

    1：那么我们来创建一个测试账号test，授予全局层级的权限。如下所示： 

     

    mysql> grant select,insert on *.* to test@'%' identified by 'test';
    Query OK, 0 rows affected (0.01 sec)
     
    mysql> flush privileges;
    Query OK, 0 rows affected (0.00 sec)
     
    mysql>

     

     

    那么可以用下面两种方式查询授予test的权限。如下所示：

     

     

    mysql> show grants for test;
    +--------------------------------------------------------------------------------------------------------------+
    | Grants for test@%                                                                                            |
    +--------------------------------------------------------------------------------------------------------------+
    | GRANT SELECT, INSERT ON *.* TO 'test'@'%' IDENTIFIED BY PASSWORD '*94BDCEBE19083CE2A1F959FD02F964C7AF4CFC29' |
    +--------------------------------------------------------------------------------------------------------------+
    1 row in set (0.00 sec)
     
    mysql> select * from mysql.user where user='test'G;
    *************************** 1. row ***************************
                      Host: %
                      User: test
                  Password: *94BDCEBE19083CE2A1F959FD02F964C7AF4CFC29
               Select_priv: Y
               Insert_priv: Y
               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: 0
               max_updates: 0
           max_connections: 0
      max_user_connections: 0
                    plugin: mysql_native_password
     authentication_string: 
          password_expired: N
    1 row in set (0.04 sec)
     
    ERROR: 
    No query specified
     
    mysql>

     

    clip_image001

     

     

     

     

    2：那么我们来创建一个测试账号test，授予数据库层级的权限。如下所示：

     

    mysql> drop user test;
    Query OK, 0 rows affected (0.00 sec)
     
    mysql> grant select,insert,update,delete on MyDB.* to test@'%' identified by 'test';
    Query OK, 0 rows affected (0.01 sec)
     
    mysql> 
     
    mysql> select * from mysql.user where user='test'G; --可以看到无任何授权。
    mysql> select * from mysql.db where user='test'G;
    *************************** 1. row ***************************
                     Host: %
                       Db: MyDB
                     User: test
              Select_priv: Y
              Insert_priv: Y
              Update_priv: Y
              Delete_priv: Y
              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
    1 row in set (0.04 sec)
     
    ERROR: 
    No query specified
     
    mysql> 
    mysql> show grants for test;
    +-----------------------------------------------------------------------------------------------------+
    | Grants for test@%                                                                                   |
    +-----------------------------------------------------------------------------------------------------+
    | GRANT USAGE ON *.* TO 'test'@'%' IDENTIFIED BY PASSWORD '*94BDCEBE19083CE2A1F959FD02F964C7AF4CFC29' |
    | GRANT SELECT, INSERT, UPDATE, DELETE ON `MyDB`.* TO 'test'@'%'                                      |
    +-----------------------------------------------------------------------------------------------------+
    2 rows in set (0.00 sec)
     
    mysql>

     

     

     

    3：那么我们来创建一个测试账号test，授予表层级的权限。如下所示：

     

     

    mysql> drop user test;
    Query OK, 0 rows affected (0.00 sec)
     
    mysql> flush privileges;
    Query OK, 0 rows affected (0.00 sec)
     
    mysql> grant all on MyDB.kkk to test@'%' identified by 'test';
    Query OK, 0 rows affected (0.01 sec)
     
    mysql> 
     
    mysql> show grants for test;
    +-----------------------------------------------------------------------------------------------------+
    | Grants for test@%                                                                                   |
    +-----------------------------------------------------------------------------------------------------+
    | GRANT USAGE ON *.* TO 'test'@'%' IDENTIFIED BY PASSWORD '*94BDCEBE19083CE2A1F959FD02F964C7AF4CFC29' |
    | GRANT ALL PRIVILEGES ON `MyDB`.`kkk` TO 'test'@'%'                                                  |
    +-----------------------------------------------------------------------------------------------------+
    2 rows in set (0.00 sec)
     
    mysql> select * from mysql.tables_privG;
    *************************** 1. row ***************************
           Host: %
             Db: MyDB
           User: test
     Table_name: kkk
        Grantor: root@localhost
      Timestamp: 0000-00-00 00:00:00
     Table_priv: Select,Insert,Update,Delete,Create,Drop,References,Index,Alter,Create View,Show view,Trigger
    Column_priv: 
    1 row in set (0.01 sec)
     
    ERROR: 
    No query specified
     
    mysql>

     

     

    clip_image002

     

     

     

    4：那么我们来创建一个测试账号test，授予列层级的权限。如下所示：

     

    mysql> drop user test;
    Query OK, 0 rows affected (0.00 sec)
     
    mysql> flush privileges;
    Query OK, 0 rows affected (0.00 sec)
     
    mysql> grant select (id, col1) on MyDB.TEST1 to test@'%' identified by 'test';
    Query OK, 0 rows affected (0.01 sec)
     
    mysql> flush privileges;
    Query OK, 0 rows affected (0.00 sec)
     
    mysql> 
     
     
    mysql> select * from mysql.columns_priv;
    +------+------+------+------------+-------------+---------------------+-------------+
    | Host | Db   | User | Table_name | Column_name | Timestamp           | Column_priv |
    +------+------+------+------------+-------------+---------------------+-------------+
    | %    | MyDB | test | TEST1      | id          | 0000-00-00 00:00:00 | Select      |
    | %    | MyDB | test | TEST1      | col1        | 0000-00-00 00:00:00 | Select      |
    +------+------+------+------------+-------------+---------------------+-------------+
    2 rows in set (0.00 sec)
     
    mysql> show grants for test;
    +-----------------------------------------------------------------------------------------------------+
    | Grants for test@%                                                                                   |
    +-----------------------------------------------------------------------------------------------------+
    | GRANT USAGE ON *.* TO 'test'@'%' IDENTIFIED BY PASSWORD '*94BDCEBE19083CE2A1F959FD02F964C7AF4CFC29' |
    | GRANT SELECT (id, col1) ON `MyDB`.`TEST1` TO 'test'@'%'                                             |
    +-----------------------------------------------------------------------------------------------------+
    2 rows in set (0.00 sec)
     
    mysql>

    clip_image003

     

     

    5：那么我们来创建一个测试账号test，授子程序层级的权限。如下所示：

     

     

    mysql> DROP PROCEDURE IF EXISTS PRC_TEST;
    Query OK, 0 rows affected (0.00 sec)
     
    mysql> DELIMITER //
    mysql> CREATE PROCEDURE PRC_TEST()
        -> BEGIN
        ->    SELECT * FROM kkk;
        -> END //
    Query OK, 0 rows affected (0.00 sec)
     
    mysql> DELIMITER ;
     
    mysql> grant execute on procedure MyDB.PRC_TEST to test@'%' identified by 'test';
    Query OK, 0 rows affected (0.01 sec)
     
    mysql> flush privileges;
    Query OK, 0 rows affected (0.00 sec)
     
    mysql> 
     
     
    mysql> show grants for test;
    +-----------------------------------------------------------------------------------------------------+
    | Grants for test@%                                                                                   |
    +-----------------------------------------------------------------------------------------------------+
    | GRANT USAGE ON *.* TO 'test'@'%' IDENTIFIED BY PASSWORD '*94BDCEBE19083CE2A1F959FD02F964C7AF4CFC29' |
    | GRANT EXECUTE ON PROCEDURE `MyDB`.`prc_test` TO 'test'@'%'                                          |
    +-----------------------------------------------------------------------------------------------------+
    2 rows in set (0.00 sec)
     
    mysql> select * from mysql.procs_priv where User='test';
    +------+------+------+--------------+--------------+----------------+-----------+---------------------+
    | Host | Db   | User | Routine_name | Routine_type | Grantor        | Proc_priv | Timestamp           |
    +------+------+------+--------------+--------------+----------------+-----------+---------------------+
    | %    | MyDB | test | PRC_TEST     | PROCEDURE    | root@localhost | Execute   | 0000-00-00 00:00:00 |
    +------+------+------+--------------+--------------+----------------+-----------+---------------------+
    1 row in set (0.00 sec)
     
    mysql>

     

     

    clip_image004

     

     

    所以，如果需要查看用户被授予的权限，就需要从这五个层级来查看被授予的权限。从上到下或从小到上，逐一检查各个层级被授予的权限。
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  • 原文地址：https://www.cnblogs.com/kerrycode/p/7423850.html
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