Spring Date Jpa 增删改查

 @Autowired
 private EntityManagerFactory entityManagerFactory;

 @PersistenceContext
 private EntityManager em;

 public Session getSession() {
    return entityManagerFactory.unwrap(SessionFactory.class).openSession();
 }    

/**
 * 多条件查询
 *
 * @param t
 */
@Override
public List<Article> ListArticle(String account,String homePage) {
    CriteriaBuilder criteriaBuilder = getSession().getCriteriaBuilder();
    CriteriaQuery<Article> criteriaQuery = criteriaBuilder.createQuery(Article.class);
    Root<Article> rt = criteriaQuery.from(Article.class);
　　
　　//条件集合
    List<Predicate> predicates = new ArrayList<Predicate>();
　　//添加条件
    predicates.add(criteriaBuilder.equal(rt.get("account"),account));
    if (Util.isNotEmpty(homePage)){
        predicates.add(criteriaBuilder.equal(rt.get("homePage"),homePage));
    }
　　//
    criteriaQuery.where(predicates.toArray(new Predicate[predicates.size()]));

    List<Article> list = getSession().createQuery(criteriaQuery).getResultList();
    return list;
}

/**
 * 创建信息
 *
 * @param t
 */
@Override
public void createObject(T t) {
    EntityManager entityManager = entityManagerFactory.createEntityManager();
    //4.开启事务
    EntityTransaction transaction = entityManager.getTransaction();
    transaction.begin();
　　
　　//新建
    entityManager.persist(t);

    //6.提交事务
    transaction.commit();

    //7.关闭 EntityManager
    entityManager.close();
}

/**
 * 修改信息
 *
 * @param t
 */
@Override
public void updateObject(T t) {
    EntityManager entityManager = entityManagerFactory.createEntityManager();
    //4.开启事务
    EntityTransaction transaction = entityManager.getTransaction();
    transaction.begin();

　　//更新
    entityManager.merge(t);

    //6.提交事务
    transaction.commit();

    //7.关闭 EntityManager
    entityManager.close();
}

/**
 * 删除信息
 *
 * @param t
 */
@Override
public void deleteObject(T t) {
    EntityManager entityManager = entityManagerFactory.createEntityManager();
    //4.开启事务
    EntityTransaction transaction = entityManager.getTransaction();
    transaction.begin();

　　//删除
    entityManager.remove(t);

    //6.提交事务
    transaction.commit();

    //7.关闭 EntityManager
    entityManager.close();
}