mysql回收用户权限

1.创建test1用户
select password(‘test1’);
±------------------------------------------+
| password(‘test1’) |
±------------------------------------------+
| *06C0BF5B64ECE2F648B5F048A71903906BA08E5C |
±------------------------------------------+
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

复制代码
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)
复制代码
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

复制代码
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)
复制代码
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

复制代码
select * from mysql.tables_priv;
±----------±----±------±-----------±---------------±--------------------±-------------±------------+
| Host | Db | User | Table_name | Grantor | Timestamp | Table_priv | Column_priv |
±----------±----±------±-----------±---------------±--------------------±-------------±------------+
| localhost | pmx | test1 | score | root@localhost | 0000-00-00 00:00:00 | Select,Grant | |
±----------±----±------±-----------±---------------±--------------------±-------------±------------+
复制代码
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

复制代码
select * from mysql.columns_priv;
±----------±----±------±-----------±------------±--------------------±------------+
| Host | Db | User | Table_name | Column_name | Timestamp | Column_priv |
±----------±----±------±-----------±------------±--------------------±------------+
| localhost | pmx | test1 | score | grade | 0000-00-00 00:00:00 | Select |
±----------±----±------±-----------±------------±--------------------±------------+
复制代码

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