Method One:
1. Turn off MySQL
# Service Mysqld Stop
2. Blocking permissions
# Mysqld_safe--skip-grant-table
Screen appears: Starting demo from .....
3. Start a new terminal input
# mysql-u Root MySQL
mysql> UPDATE user SET Password=password (' NewPassword ') where user= ' root ';
Mysql> FLUSH privileges;//Remember to say this, otherwise if you close the previous terminal, the original error will appear
Mysql> \q
Method Two:
1. Turn off MySQL
# Service Mysqld Stop
2. Blocking permissions
# Mysqld_safe--skip-grant-table
Screen appears: Starting demo from .....
3. Start a new terminal input
# mysql-u Root MySQL
mysql> Delete from user where user= ';
Mysql> FLUSH privileges;//Remember to say this, otherwise if you close the previous terminal, the original error will appear
Mysql> \q
Mysql-error 1044 (42000): Access denied for user "@ ' localhost ' to database ' Mysql '