学习hibernate的简单例子（源码）

package bean; import java.util.Date; import java.util.List; import org.hibernate.HibernateException; import org.hibernate.SessionFactory; import org.hibernate.cfg.Configuration; import org.hibernate.classic.Session; public class Test { private static final SessionFactory sessionFactory; static { try { sessionFactory = new Configuration().configure() .buildSessionFactory(); } catch (Throwable ex) { // Make sure you log the exception, as it might be swallowed System.err.println("Initial SessionFactory creation failed." + ex); throw new ExceptionInInitializerError(ex); } } public static SessionFactory getSessionFactory() { return sessionFactory; } public static void main(String[] args) { News news = new News(); news.setTitle("I miss you "); news.setContent("baby i miss you !"); news.setDate(new Date()); Test t = new Test(); //t.Save(news); t.select(); // t.update(); // t.delete(); } public void Save(News news) { try { Session session = Test.getSessionFactory().getCurrentSession(); session.beginTransaction(); session.save(news); session.getTransaction().commit(); } catch (HibernateException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public void select() { try { Session session = Test.getSessionFactory().getCurrentSession(); session.beginTransaction(); String sql=" from News"; //String sql="from News where id=1"; List<News> l = session.createQuery(sql).list(); for (News n : l) { System.out.println(n.getId()); System.out.println(n.getTitle()); System.out.println(n.getContent()); System.out.println(n.getDate()); System.out.println("=============="); } session.getTransaction().commit(); } catch (HibernateException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public void update() { try { Session session = Test.getSessionFactory().getCurrentSession(); session.beginTransaction(); Integer id = 1; News n = (News) session.load(News.class, new Integer(id)); n.setTitle("do you miss me?"); session.update(n); session.getTransaction().commit(); } catch (HibernateException e) { // TODO Auto-generated catch block e.printStackTrace(); } } public void delete() { try { Session session = Test.getSessionFactory().getCurrentSession(); session.beginTransaction(); Integer id = 6; News n = (News) session.load(News.class, new Integer(id)); session.delete(n); session.getTransaction().commit(); } catch (HibernateException e) { // TODO Auto-generated catch block e.printStackTrace(); } } }