测试应用 public void testGet() {Session session=HibernateUtil.getinstance().getSession();Transaction transaction=session.beginTransaction();Student s = session.get(Student.class, 1);System.out.println(s.getTeachers().size());transaction.commit();}
手动创建方式,以一个测试类为例
public class TestSession {SessionFactory sessionFactory = null;Session session = null;Transaction ts = null;@Beforepublic void beforP() {System.out.println("begin....");/* hibernate规定,所有的配置或服务,必须配置或注册到一个服务注册类中 */Configuration configuration = new Configuration().configure();ServiceRegistry sr = configuration.getStandardServiceRegistryBuilder().build();/* 从注册类中获得工厂类 */sessionFactory = new MetadataSources(sr).buildMetadata().buildSessionFactory();/* 通过工厂类开启Session */session = sessionFactory.openSession();/* 开启事务 */ts = session.beginTransaction();}@Afterpublic void endP() {System.out.println("end....");/* 提交事务 */ts.commit();/* 关闭Session */session.close();/* 关闭工厂 */sessionFactory.close();}@Testpublic void testGet() {// 使用get时, class标签中lazy值不管是true还是false都会直接加载,当set标签// 中fetch="join"时,会在get时使用左join将其集体一起检索出来,访问数据库只需一次// fetch值是其它时则需要访两次Student s = session.get(Student.class, 1);System.out.println(s.getTeachers().size());}}