解决ERROR 1044 (42000): Access denied for user ‘‘@‘localhost‘ to database ‘mysql‘

# /etc/init.d/mysql stop 

# mysqld_safe --user=mysql --skip-grant-tables --skip-networking & 
# mysql -u root mysql 

mysql> UPDATE user SET Password=PASSWORD(’newpassword’) where USER=’root’; 

delete from user where USER=‘‘;

mysql> FLUSH PRIVILEGES; 
mysql> quit;