Hibernate的增删查改

增加：

//获得session
Configuration configuration = new Configuration();
ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
SessionFactory sessionFactory = configuration.configure().buildSessionFactory(serviceRegistry);
Session session = sessionFactory.openSession();

//开启事务
Transaction transaction = session.beginTransaction();

//新增
session.persist(user);//user为想要新增的对象

//先提交事务后关闭session
transacition.commit();
session.close();

删除：

///获得session
Configuration configuration = new Configuration();
ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
SessionFactory sessionFactory = configuration.configure().buildSessionFactory(serviceRegistry);
Session session = sessionFactory.openSession();

//开启事务
Transaction transaction = session.beginTransaction();

//删除
session.delete(user);//user为想要删除的对象

//先提交事务后关闭session
transacition.commit();
session.close();

查询（查询可不开启事务）：

//获得session
Configuration configuration = new Configuration();
ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
SessionFactory sessionFactory = configuration.configure().buildSessionFactory(serviceRegistry);
Session session = sessionFactory.openSession();

String hql = "from User where id=:id";
Query query = session.createQuery(hql);
query.setParameter("id", 21);//参数
List objectList = query.list();//转化成列表
session.close();

修改：

//获得session
Configuration configuration = new Configuration();
ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(configuration.getProperties()).buildServiceRegistry();
SessionFactory sessionFactory = configuration.configure().buildSessionFactory(serviceRegistry);
Session session = sessionFactory.openSession();

//开启事务
Transaction transaction = session.beginTransaction();

//更新
session.update(user);//user为想要更新的对象

//先提交事务后关闭session
transacition.commit();
session.close();