求助hibernate ：failed to lazily initialize a collect

2011-05-14 05:18:15 130 阅读 AI 写同款 · GEO 优化AI 选题数据监测一键分发 ›

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这是Bill.hbm.xml:

  <class name="entity.Bill" table="Bill">

      <id name="id" column="oid">

          <generator class="increment" />

      </id>

      <property name="tableNum" column="table_num" />

      <property name="consumption" column="consumption" />

      <property name="isFinished" column="is_finished" />

      <property name="createDate" column="create_date" />



      <set name="itemSet" cascade="all" lazy="false">

          <key column="Bill_id" />

          <one-to-many class="entity.Item" />

      </set>

  </class>

测试代码：

Dish dish1 = DishDAO.findDishByName("apple");

        Bill bill = BillDAO.findBill("B");

        Item item = ItemDAO.createItem(new Item(1,dish1));

        bill.getItemSet().add(item);

BillDAO.findBill()

public static Bill findBill(String tableNum) throws Exception {



        Session session = HibernateUtil.getSessionFactory().openSession();

        Transaction tx = session.beginTransaction();

        Bill bill;



        Query query = session.createQuery("from Bill bill where bill.tableNum=:tableNum and bill.isFinished=false");

        query.setParameter("tableNum", tableNum);

        List list = query.list();

        Iterator iter = list.iterator();



        if(iter.hasNext()) {

            bill = (Bill) iter.next();

        }else {

            tx.commit();

            session.close();

            throw new Exception("bill not found");

        }



        tx.commit();

        session.close();



        return bill;

        

    }