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

。 https://blog.csdn.net/Aaronzzq/article/details/80418908

在修改mysql的root用户密码后，再登陆，提示如标题的错误，找了一番答案之后，终于解决，步骤如下：

1.停掉mysql: service mysqld stop

2.使用不验证的状态登陆mysql:

mysqld_safe --skip-grant-tables & //后台运行

启动mysql: service mysqld starthttp://ncre.neea.edu.cn/

3.进入mysql: mysql -u root

4.use mysql;

5.delete from user where user=''; 删除空用户

6.flush previlige; 刷新权限

7.service mysqld restart

8.问题解决

insert into `user` (`Host`,`User`,`Password',`ssl_cipher`,`x509_issuer`,`x509_subject`) VALUES ('localhost2','root',password('1234'),' ',' ',' ');

UPDATE user SET
  `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`  = 'Y',
  `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',
  `Event_priv` = 'Y',
  `Trigger_priv`   = 'Y',
  `Create_tablespace_priv` = 'Y' WHERE user = 'root';

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