Question

我使用Spring的HibernateDAOSupport类来处理我的DAO。我的问题是，当我使用getHibernateSupport（）。save（order）时，数据库中已经存在订单，它只是更新数据库行而不是抛出某种异常。

我的Hibernate hbm.xml文件是：

<hibernate-mapping>
<class name="com.shopping.db.CustomerOrder" table="CUSTOMERORDER" schema="PUBLIC">
    <id name="orderID" type="long">
        <column name="ORDERID" length="50" />
    </id>
    <many-to-one name="customer" class="com.shopping.db.Customer" fetch="select">
        <column name="USERNAME" length="50" not-null="true" />
    </many-to-one>
    <property name="status" type="string">
        <column name="STATUS" length="50" not-null="true" />
    </property>
    <property name="totalCost" type="float">
        <column name="TOTALCOST" precision="0" scale="0" not-null="true" />
    </property>
    <property name="orderDate" type="java.sql.Date">
        <column name="ORDERDATE" not-null="true" />
    </property>
</class>
</hibernate-mapping>

我的DAO代码是：

public void createDBOrder(CustomerOrder order, List<OrderItem> orderItems) 
{
  getHibernateTemplate().save(order);
  for (OrderItem item : orderItems) 
  {
    getHibernateTemplate().save(item);
  }
  getHibernateTemplate().flush();
}

我的测试方法如下：

@Test
 public void testCreateDBOrder() 
 {
  int ordersCount = countRowsInTable("CUSTOMERORDER");
  int orderItemsCount = countRowsInTable("ORDERITEM");
  // Check for row count before insertion.
  assertEquals(1, ordersCount);
  assertEquals(1, orderItemsCount);

  CustomerOrder order = new CustomerOrder(3, dataAccessObject
  .getCustomerByName("Oussama"), "PENDING", 200, new Date(new Long(
"61191781200000")));
  OrderItem item = new OrderItem(333, dataAccessObject.getProductByID("Apple iPhone"),       order, 3);
  OrderItem item2 = new OrderItem(444, dataAccessObject.getProductByID("DV2000"), order, 2);
  List<OrderItem> items = new ArrayList<OrderItem>();
  items.add(item);
  items.add(item2);
  dataAccessObject.createDBOrder(order, items);
  ordersCount = countRowsInTable("CUSTOMERORDER");
  orderItemsCount = countRowsInTable("ORDERITEM");
  // Check for row count after insertion.
  assertEquals(2, ordersCount);
  assertEquals(3, orderItemsCount);
  assertEquals(3, dataAccessObject.getOrderByID(3).getOrderID());
  assertEquals(2, dataAccessObject.getOrderItemByOrderID(3).size());

  order.setStatus("SHIPPED");

  // Check for creating a order with the same ID.
  dataAccessObject.createDBOrder(order, items);
  assertEquals("SHIPPED", dataAccessObject.getOrderByID(3).getStatus());

  ordersCount = countRowsInTable("CUSTOMERORDER");
  // Check for row count after insertion.
  //assertEquals(3, ordersCount);
 }

为什么getHibernateTemplate（）。save（）只是因为主键已经存在而抛出异常而更新数据库行。

Answer 1

第二个save被加入，因为您正在保存已保存的同一个CustomerOrder实例（即持久对象）。如果您尝试保存具有相同ID的不同实例（即瞬态对象），则会出现异常。

尝试插入重复的Key行时，HibernateTemplate Save Not Throwing Exception

1 个答案: