Mysql – 解决Access denied for user ”@’localhost’ to database ‘mysql’问题

问题的引出:我在CentOS上装完mysql后,用navicat链接的时候,抛出

MySql - SQL Error (1130): Host IP is not allowed to connect to this MySQL server

错误,具体解决方法请参考本人日志http://361324767.blog.163.com/blog/static/114902525201232832621498/。
该问题解决后,本人登录mysql ,输mysql -u root时无错,但是执行如下语句时:

mysql> use mysql

抛出该错误,参考网上各位大抄的大作如下:

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如先输入mysql,成功启动后输入use mysql,出现如下错误:

Access denied for user ''@'localhost' to database 'mysql'

还有,输mysql可以,输mysql -u root就出错了:

Access denied for user 'root'@'localhost' (using password: NO).

The reason is:
是昨日更新ROOT密码时出错
update user set password = '123456' where user ="root" //这样写是错的,密码其实不是123456
应该为update user set password = password ('123456') where user = "root"
具体操作步骤:
关闭mysql:

# service mysqld stop

然后:

# mysqld_safe --skip-grant-tables

启动mysql:

# service mysqld start
mysql -u root
mysql> use mysql
mysql> UPDATE user SET Password=PASSWORD('xxx') WHERE user='root';
mysql> flush privileges;
mysql>\q

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按照各位大抄的步骤一步一步做,没有任何效果,仔细研究错误信息中的 user''@'localhost' ,说明user表中的user=‘’的信息有误,然后执行

UPDATE user SET Password=PASSWORD('') WHERE user='';

果断没有作用。

最后不允许匿名登录,执行以下语句

mysql> delete from user where user='';
mysql > flush privileges;
mysql> \q
# service mysqld restart

问题解决。

源:http://361324767.blog.163.com/blog/static/11490252520124454042468/


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