@PersistenceContext
protected EntityManager em;

public List<Video> findVideoList1() {
　　String hql = "from Video order by id desc";
　　Query query = em.createQuery(hql);
　　List<Video> result = query.getResultList();
　　em.clear();
　　return result;
}

public List<Video> findVideoList2() {
　　List<Video> result = (List<Video>) em.createNativeQuery
　　　　("select * from db_video where date_sub(curdate(), interval 6 day) <= date(date) order by date desc", Video.class)
　　　　.getResultList();
　　return result;
}