public HashEntity getAccountByUsername(String username){
        Session session=HibernateUtil.getSessionFactory().openSession();
        session.beginTransaction();
        Query query= session.createQuery("from HashEntity where username=:username");
        query.setString("username", username);
        HashEntity accountEntity= (HashEntity) query.uniqueResult();
        session.getTransaction().commit();
        session.close();
        return accountEntity;
    }