hibernate批量插入、删除、更新。

一：效率最不好的批量插入、更新。

    //批量创建Person；批量创建一千个人到Person表中
    public void batchSavePerson(){
    	Configuration cfg = new Configuration().configure();
    	SessionFactory sessionFactory = cfg.buildSessionFactory();
    	Session session = sessionFactory.openSession();
    	Transaction ts = session.beginTransaction();
    	Address address = new Address("河南省汝州市杨楼乡");
    	Person p;
    	for(int i=0; i < 3000; i++){
    		p = new Person();
    		p.setAddress(address);
    		p.setName("陈超阳"+i);
    		p.setAge(26);
    		session.save(p);
    		//20个清空session缓冲，防止内存溢出
    		if(i%20 == 0){
    			session.flush();
    			session.clear();
    		}
    	}
        ts.commit();
        session.close();
        sessionFactory.close();
    }
    //批量更新；批量更新Person表中所有的记录
    public void batchUpdatePerson(){
    	Configuration cfg = new Configuration().configure();
    	SessionFactory sessionFactory = cfg.buildSessionFactory();
    	Session session = sessionFactory.openSession();
    	Transaction ts = session.beginTransaction();
    	ScrollableResults persons = session.createQuery("from Person")
    			                    .setCacheMode(CacheMode.IGNORE)
    			                    .scroll(ScrollMode.FORWARD_ONLY);
    	int count = 0;
    	//遍历persons表中的全部记录
    	while(persons.next()){
    		Person p = (Person)persons.get(0);
    		p.setName("chenchaoyang" + count);
    		if(++count %20 == 0){
    			session.flush();
    			session.clear();
    		}
    	}
        ts.commit();
        session.close();
        sessionFactory.close();
    }

二：hql批量插入、更新，效率较高，常用方法
    //hql批量更新
    public void batchUpdateByHql(){
    Configuration cfg = new Configuration().configure();
    SessionFactory sessionFactory = cfg.buildSessionFactory();
    Session session = sessionFactory.openSession();
    Transaction ts = session.beginTransaction();
        
        String hqlUpdate = "update Person set name = :newName";
        int updateEntites = session.createQuery(hqlUpdate)
                    .setString("newName", "yangui")
                    .executeUpdate();
    session.flush();
    ts.commit();
    session.close();
    sessionFactory.close();
    }
   
    //hql批量删除
    public void batchDeleteByHql(){
    Configuration cfg = new Configuration().configure();
    SessionFactory sessionFactory = cfg.buildSessionFactory();
    Session session = sessionFactory.openSession();
    Transaction ts = session.beginTransaction();
        String hqlDelete = "delete Person";
        int updateEntites = session.createQuery(hqlDelete)
                    .executeUpdate();
    session.flush();
    ts.commit();
    session.close();
    sessionFactory.close();
    }