I have two tables, orders and order_items. The relationship between them is One-to-Many. Order_items.fk_orders is the foreign key. Orders.ID is the primary key.
I first save the orders and then the order_items, but the order_items.fk_orders is different from the orders.ID and the order_items.fk_orders values is long(eg '3213148',but the normal value is '425618'),the problem only occurs sometimes.
Orders.hbm.xml as below:
....
<id name="id" column="ID" type="java.lang.Long">
<generator class="native">
</generator>
</id>
<set name="orderProduct" lazy="false" cascade="all"
sort="unsorted">
<key column="FK_ORDERS"></key>
<one-to-many
class="com.arvato.ecommerce.model.base.OrderItems"/>
</set>
....
OrderItem.hbm.xml as below:
....
<id name="id" column="ID" type="java.lang.Long">
<generator class="native">
</generator>
</id>
<many-to-one name="orders"
class="com.arvato.ecommerce.model.base.Orders" cascade="none"
outer-join="auto" update="true" insert="true" lazy="false"
column="FK_ORDERS"/>
....
The code as below:
//save order
Orders orders = new Orders();
....
....
orders.setOrderItems(null);//(I think it is strange I don't know why set the null value to OrderItems?)
session = getSession();
session.save(object);
session.flush()
//save order items
....
Collection orderItems = orders.getOrderItems();
if (orderItems != null) {
OrderItem orderItem;
for (Iterator itemIterator = orderItems.iterator(); itemIterator.hasNext(); orderdao.insertOrderProduct(orderItem)) {
orderItem = (OrderItem) itemIterator.next();
orderItem.setOrders(orders);
}
}
....
public int insertOrderProduct(OrderItem orderItem)
throws DaoException {
Session session =null;
try {
session = getSession();
session.save(orderItem);
session.flush();
return 1;
} catch (Exception e) {
e.printStackTrace();
return 0;
}
}
Your mapping seems correct, that's the way you are using it that is wrong. Since you use cascade="all"
, all the OrderItems
listed in an instance of Orders
will be automatically persisted when you save the Orders
instance !
The below code should be enough :
Orders orders = new Orders();
orders.addItem(new OrderItem());
...
session = getSession();
session.save(object);
session.flush()
where the addItem method looks like :
public void addItem(OrderItem item) {
if (items == null) {
items = new ArrayList<OrderItem>();
}
item.setOrders(this);
items.add(item);
}
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