测试Hibernate动态添加实体类

大家知道通过hibernate cfg或和spring集成的配置里，可用packagesToScan或mapping*之类声明实体类；但有需求可能要在某个项目中编码式加载实体类（例如某个不常用的或特定用户的实体类，并未事先配置），然后进行增删改查操作。下面代码配合spring test framework做了测试（注：hibernate升级到了4.3.final，与4.2有不同，spring3或4测试通过）：

@RunWith(SpringJUnit4ClassRunner.class)
@ContextConfiguration(locations = { "/spring-hibernate.xml" })
public class ConfigurationTest extends AbstractJUnit4SpringContextTests {
    public static final String session_factory = "sessionFactory";
  // 值得注意: org.springframework.beans.factory.FactoryBean that creates a Hibernate org.hibernate.SessionFactory
  public static final String local_session_factory = "&sessionFactory";

  @Test
  public void sessionFactoryAndFactoryBean() throws ClassNotFoundException {
      SessionFactory sessionFactory = (SessionFactory) applicationContext.getBean(session_factory);
      Map<String, ClassMetadata> meta = sessionFactory.getAllClassMetadata();
      for (Entry<String, ClassMetadata> each : meta.entrySet()) {
          ClassMetadata value = each.getValue();
          System.out.println("entity name:" + value.getEntityName());
      }

      LocalSessionFactoryBean sessionFactoryBean = (LocalSessionFactoryBean) applicationContext.getBean(local_session_factory);

      Configuration config = sessionFactoryBean.getConfiguration();
      config.addAnnotatedClass(User.class);
      ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(config.getProperties()).build();
      SessionFactory newSessionFactory = config.buildSessionFactory(serviceRegistry);
      Session session = newSessionFactory.openSession();

      User user = new User();
      user.setName("username");
      session.save(user);
      session.flush();

      user = (User) session.get(User.class, user.getId());
      session.close();
      System.out.println("------" + user.getId());
      System.out.println("------" + user.getName());

      Iterator<Table> mappings = config.getTableMappings();
      while (mappings.hasNext()) {
          Table each = mappings.next();
          System.out.println("table name:" + each.getName());
      }

  }
}