Hibernate Dialect must be explicitly set的异常(初学者较容易犯的错误)

异常是这样
org.hibernate.HibernateException: Hibernate Dialect must be explicitly set

正确写法：public void save(Login login) {

Configuration config = new Configuration();
SessionFactory sf=config.configure().buildSessionFactory(); Session s=sf.openSession();
Transaction t =s.beginTransaction();
s.save(login);
t.commit();
s.close();

}
}
错误写法：public void save(Login login) {

Configuration config = new Configuration();
SessionFactory sf=config.buildSessionFactory(); Session s=sf.openSession();
Transaction t =s.beginTransaction();
s.save(login);
t.commit();
s.close();

}
}

关键错误就在于漏掉一个configure()