Hibernate的数据操作(4.*以上版本)

public class NewsTest {
	private Session session = null;
	private SessionFactory sf = null;
	private Transaction ts = null;
	
	@Before
	public void init() {
		Configuration config = new Configuration();
		config.configure();
		ServiceRegistry sr = new StandardServiceRegistryBuilder().applySettings(config.getProperties()).build();
		sf = config.buildSessionFactory(sr);
		session = sf.openSession();
		ts = session.beginTransaction();

	}

	@After
	public void destroy() {
		ts.commit();
		session.close();
		sf.close();
	}

	@Test
	public void testGet() {
		News news = (News) session.get(News.class, 21);
		System.out.println(news);

	}
	@Test
	public void testSave(){
		News news = new News();
		news.setId(10);
		news.setContent("撒");
		news.setTitle("标题");
		news.setCreateDate(new Date());
		session.save(news);
	}
	@Test
	public void testHQL(){
//		String sql = "select new News(n.id, n.title) from News n order by n.id desc";
		String sql = "select  n.id, n.title from News n order by n.id desc";
		Query query = session.createQuery(sql);
		//query.setString("order", "‘desc‘");
		//query.setInteger(0, 43);
//		query.setParameter(1, 42);//org.hibernate.QueryParameterException: Position beyond number of declared ordinal parameters. Remember that ordinal parameters are 1-based! Position: 2
		
//		Criteria criteria = session.createCriteria(News.class);
//		criteria.add(Restrictions.eq("id", 1));
		
//		SQLQuery sqlQuery = session.createSQLQuery(queryString);
//		sqlQuery.addEntity(News.class);
		
		List<News> list = query.list();
		System.out.println(list);
		
//		List<Object[]> list = query.list();
//		for(Object[] news:list){
//			for(Object o : news){
//				System.out.println(o);
//			}
//		}
	}
	
	@Test
	public void testQueryPage(){
		//分页查询
		String sql = "from News ";
		Query query = session.createQuery(sql);
		int page = 2;
		int rows = 2;
		query.setFirstResult((page-1)*rows);//起始行
		query.setMaxResults(rows);//最大行数
		List<News> list = query.list();
		System.out.println(list);
	}
	@Test
	public void testManyToOne(){
		//数据操作
		Factory factory1 = new Factory("三星2");
		Factory factory2 = new Factory("谷歌");
		Product product1 = new Product("note3",1230,factory1);
		Product product2 = new Product("galaxy",2300,factory1);
		Product product3 = new Product("glass",1340,factory2);
		
		//如果工厂与产品保存顺序相反，则结束之后执行update操作
		session.save(factory1);
		session.save(factory2);
		session.save(product1);
		session.save(product2);
		session.save(product3);
	}
	
	@Test
	public void testGetManyToOne(){
		//多对一的关联操作
		Product product = (Product)session.get(Product.class, 4);
		System.out.println("Product name : "+product.getName());
		//懒加载，用到才查询
		System.out.println("Factory Name : "+product.getFactory().getName());
	}
	@Test
	public void testGetOneToMany(){
		//一对多的关联操作
		Factory factory = (Factory)session.get(Factory.class, 2);
		System.out.println("Product name : "+factory.getName());
		System.out.println("Product count : "+factory.getProducts().size());
	}
	@Test
	public void testDeleteOneToManyCascade(){
		Factory factory = (Factory)session.get(Factory.class, 6);
		session.delete(factory);
	}

}