1、问题重现
前几天因为有人删除了数据库中的记录，今天关闭了数据库的远程访问功能，今天接到开发报告，说出现 The user specified as a definer (‘air’@’%’) does not exist错误，他们定位是一张视图不能访问。利用实验重现了他们的情况
[[email protected] ~]# mysql -uxff -pxifenfei
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 8846
Server version: 5.5.14-log MySQL Community Server (GPL)
Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> select user,host from mysql.user;
+------+---------------+
| user | host |
+------+---------------+
| xff | % |
| root | 127.0.0.1 |
| repl | 192.168.11.10 |
| root | ::1 |
| | ECP-UC-DB1 |
| root | ECP-UC-DB1 |
| root | localhost |
+------+---------------+
7 rows in set (0.08 sec)
mysql> use xifenfei;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> create view v_users as select * from wp_users;
Query OK, 0 rows affected (0.14 sec)
mysql> select count(*) from xifenfei.v_users;
+----------+
| count(*) |
+----------+
| 2 |
+----------+
1 row in set (0.03 sec)
mysql> update mysql.user set host='localhost' where user='xff' and host='%';
Query OK, 1 row affected (0.05 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.12 sec)
mysql> exit
Bye
[[email protected] ~]# mysql -uxff -pxifenfei
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 8847
Server version: 5.5.14-log MySQL Community Server (GPL)
Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
Oracle is a registered trademark of Oracle Corporation and/or its
affiliates. Other names may be trademarks of their respective
owners.
Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.
mysql> use xff;
ERROR 1049 (42000): Unknown database 'xff'
mysql> use xifenfei;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> select * from v_users ;
ERROR 1449 (HY000): The user specified as a definer ('xff'@'%') does not exist
2、解决方法
mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| mysql |
| performance_schema |
| test |
| xifenfei |
+--------------------+
5 rows in set (0.00 sec)
mysql> use information_schema;
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A
Database changed
mysql> desc VIEWS;
+----------------------+--------------+------+-----+---------+-------+
| Field | Type | Null | Key | Default | Extra |
+----------------------+--------------+------+-----+---------+-------+
| TABLE_CATALOG | varchar(512) | NO | | | |
| TABLE_SCHEMA | varchar(64) | NO | | | |
| TABLE_NAME | varchar(64) | NO | | | |
| VIEW_DEFINITION | longtext | NO | | NULL | |
| CHECK_OPTION | varchar(8) | NO | | | |
| IS_UPDATABLE | varchar(3) | NO | | | |
| DEFINER | varchar(77) | NO | | | |
| SECURITY_TYPE | varchar(7) | NO | | | |
| CHARACTER_SET_CLIENT | varchar(32) | NO | | | |
| COLLATION_CONNECTION | varchar(32) | NO | | | |
+----------------------+--------------+------+-----+---------+-------+
10 rows in set (0.02 sec)
mysql> select TABLE_SCHEMA,TABLE_NAME,DEFINER from views;
+--------------+------------+---------+
| TABLE_SCHEMA | TABLE_NAME | DEFINER |
+--------------+------------+---------+
| xifenfei | v_users | xff@% |
+--------------+------------+---------+
1 row in set (0.16 sec)
mysql> create or replace view v_users as select * from wp_users;
ERROR 1044 (42000): Access denied for user 'xff'@'localhost' to database 'information_schema'
mysql> create or replace view xifenfei.v_users as select * from xifenfei.wp_users;
Query OK, 0 rows affected (0.02 sec)
mysql> select TABLE_SCHEMA,TABLE_NAME,DEFINER from views;
+--------------+------------+---------------+
| TABLE_SCHEMA | TABLE_NAME | DEFINER |
+--------------+------------+---------------+
| xifenfei | v_users | [email protected] |
+--------------+------------+---------------+
1 row in set (0.01 sec)
mysql> select count(*) from xifenfei.v_users;
+----------+
| count(*) |
+----------+
| 2 |
+----------+
1 row in set (0.03 sec)
3、原因分析
因为创建视图使用的是xff@%用户(目前已经不存在)，然后登录用户使用的是[email protected]用户，导致mysql认为现在的用户无权限访问该视图，解决方法就是在当前用户下重建该视图