怎么解决mysql删除用户后再新建该用户仍然具有原来权限的问题

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本篇内容主要讲解“怎么解决 mysql 删除用户后再新建该用户仍然具有原来权限的问题”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让丸趣 TV 小编来带大家学习“怎么解决 mysql 删除用户后再新建该用户仍然具有原来权限的问题”吧!

所以如果需要减小权限，需要删除原来的用户然后再从新建立一个新用户！

还有，重新建立用户后（grant select,update on *.* to aa @ % identified by aa），发现还是能 delete 和 insert 数据

这是因为除了在 user 表控制权限外，db 表也控制对数据库的权限，需要把这里边的相应数据删除后 flush privileges 后就可以了！

[@more@]
用户问题：

发现先按下列语句建立用户：

mysql grant all privileges on *.* to aa @ % identified by aa
Query OK, 0 rows affected (0.00 sec)

mysql select * from mysql.user where user = aa G
*************************** 1. row ***************************
Host: %
User: aa
Password: *DEE59C300700AF9B586F9F2A702231C0AC373A13
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
ssl_type:
ssl_cipher:
x509_issuer:
x509_subject:
max_questions: 0
max_updates: 0
max_connections: 0
max_user_connections: 0
1 row in set (0.00 sec)

然后：

mysql grant select,update on *.* to aa @ % identified by aa
Query OK, 0 rows affected (0.00 sec)

mysql select * from mysql.user where user = aa G
*************************** 1. row ***************************
Host: %
User: aa
Password: *DEE59C300700AF9B586F9F2A702231C0AC373A13
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
ssl_type:
ssl_cipher:
x509_issuer:
x509_subject:
max_questions: 0
max_updates: 0
max_connections: 0
max_user_connections: 0
1 row in set (0.00 sec)

发现权限没有改变 …
难道这样新加的是在前面的权限基础上再添加权限？

新建个用户看看：

mysql grant select,update on *.* to bb @ % identified by bb
Query OK, 0 rows affected (0.00 sec)

mysql select * from mysql.user where user = bb G
*************************** 1. row ***************************
Host: %
User: bb
Password: *E72B08C841E005B05BD564FA1C18CAFFB9FEF5FC
Select_priv: Y
Insert_priv: N
Update_priv: Y
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
ssl_type:
ssl_cipher:
x509_issuer:
x509_subject:
max_questions: 0
max_updates: 0
max_connections: 0
max_user_connections: 0
1 row in set (0.00 sec)

mysql grant delete,insert on *.* to bb @ % identified by bb
Query OK, 0 rows affected (0.00 sec)

mysql
mysql select * from mysql.user where user = bb G
*************************** 1. row ***************************
Host: %
User: bb
Password: *E72B08C841E005B05BD564FA1C18CAFFB9FEF5FC
Select_priv: Y
Insert_priv: Y
Update_priv: Y
Delete_priv: Y
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
ssl_type:
ssl_cipher:
x509_issuer:
x509_subject:
max_questions: 0
max_updates: 0
max_connections: 0
max_user_connections: 0
1 row in set (0.00 sec)