mysql Access denied for user 错误处理

 

 

MySQL中出现连接错误:

               ERROR 1045 (28000): Access denied for user

----------------------------------------------------------------------------------

1.添加用户

shell>mysql

mysql>use mysql

mysql>grant all privileges on *.* to 'test' identified by 'test' with grant option;

mysql>flush privileges;

[也可以使用下面两种方式建立用户]

------------------------

  $1直接操作mysql.user这张表;

  $2使用DDL语言,
    定义用户:create user test identified by 'test';

    删除用户:drop user test

------------------------
 

2.使用test登录(总是无法连接)

shell>mysql -u test -p

ERROR 1045 (28000): Access denied for user 'test'@'localhost' (using password: YES)

 

 

3.查看user表,我们会发现user表中的user字段有NULL

mysql> select host,user from user;
+------------------+------+
| host             | user |
+------------------+------+
| %                | test | 
| localhost        |      | 
| localhost        | root | 
| test.saeg.com.cn |      | 
| test.saeg.com.cn | root | 
+------------------+------+
5 rows in set (0.00 sec)

 

4.删除user.user中值为NULL的,或更新NULL为test

   4.1)delete from user where user is NULL

   4.2)update user set user='test' where user is NULL

 

 

5.参看用户权限

 show grants for root@'localhost';

 

+------------------------------------------------------------------------------------------------------------------------------------------------+

 

 

 

 

 

 

| Grants for test@%                                                                                                              |

+------------------------------------------------------------------------------------------------------------------------------------------------+

 

 

 

 

 

 

| GRANT ALL PRIVILEGES ON *.* TO 'test'@'%' IDENTIFIED BY PASSWORD '*dfg' WITH GRANT OPTION |

+------------------------------------------------------------------------------------------------------------------------------------------------+

 

 

 

 

 

 

 

 

因为你的帐号权限问题才导致此错误。。。所以你要把你访问数据库的帐号的权限改一下。。

具体格式如：grant all on mysql.* to 'root'@'localhost' identified by 'password'; 
1。mysql.* 你访问的数据库名字。

2。root' 你的用户名

3。'password' 需要修改的密码。。

 

 

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