mysql回收用户权限

￡神魔★判官ぃ 2023-07-18 06:23 6阅读 0赞

### 1.创建test1用户 ###

select password('test1');

按 Ctrl+C 复制代码

create user 'test1'@'localhost' identified by password '*06C0BF5B64ECE2F648B5F048A71903906BA08E5C';

这里create user中密码使用普通字符串时，则不需要password关键字，当使用password()函数加密之后的字符串时，则需要有password关键字

### 2.授权 ###

grant select,create,delete on pmx.* to 'test1'@'localhost' with grant option;

grant后面可以不用设置密码，因为在create user中已经设置好了。为数据库pmx下的所有表授权，用户的权限信息保存在mysql.db表中。

### 3.收回权限 ###

revoke select,create,delete,grant option on pmx.*  from 'test1'@'localhost';

或者

revoke all privileges,grant option from 'test1'@'localhost';

或者

revoke all privileges on pmx.*  from 'test1'@'localhost';
    revoke grant option on pmx.* from 'test1'@'localhost';

### 4. 授予什么权限就回收什么权限 ###

4.1

grant select on *.* to 'test1'@'localhost' with grant option;

授予全局权限,权限信息保存在mysql.user表中

select * from mysql.user where user='test1'\G;
    *************************** 1. row ***************************
                      Host: localhost
                      User: test1
                  Password: *06C0BF5B64ECE2F648B5F048A71903906BA08E5C
               Select_priv: Y
               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: Y
           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 (0.00 sec

4.2

grant select on pmx.* to 'test1'@'localhost' with grant option;

授予数据库权限，权限信息保存在mysql.db表中

select * from mysql.db\G;
    *************************** 1. row ***************************
                     Host: localhost
                       Db: pmx
                     User: test1
              Select_priv: Y
              Insert_priv: N
              Update_priv: N
              Delete_priv: N
              Create_priv: N
                Drop_priv: N
               Grant_priv: Y
          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 rows in set (0.00 sec)

4.3

grant select on pmx.score to 'test1'@'localhost' with grant option;

授予某张表权限，权限信息保存在mysql.tables\_priv表中

4.4

grant select(grade) on pmx.score to 'test1'@'localhost' with grant option;

授予某个字段的权限，权限信息保存在mysql.columns\_priv表中

当使用

revoke all privileges on *.* from 'test1'@'localhost';

回收的只是全局的权限，test1用户其他的权限，比如对pmx数据库的权限，对score表的权限，对某个字段的权限仍然持有。 所以为了回收用户的所有权限，使用

revoke all privileges,grant option from 'test1'@'localhost';

这是条固定语法，all privileges和grant option必须都有