mysql连接登录问题

ERROR 1045 (28000): Access denied for user

MySQL中出现连接错误:

               ERROR 1045 (28000): Access denied for user

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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

 

 

问题解决

 

 

另:[我的系统是RHEL4.0]

 

  1.mysql的配置文件my-*.cnf

     /usr/local/mysql/

  2.初始化数据库

    /usr/bin/mysql_install_db