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

安装Mysql后在终端输入, mysql

成功启动，退出，再输入mysqladmin -u root password XXXXX， 出现错误：mysqladmin: connect to server at 'localhost' failed

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

 

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).

 

具体操作步骤：

关闭mysql:

# service mysqld stop

然后:

# mysqld_safe --skip-grant-tables（该命令完成后，可能终端不会提示输入下一命令，下面命令在新开的终端中实现）

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