Often, you want to retrieve multiple instances of a given entity and list them
in a particular order. The
service.xml file lets you specify the default order
of your entities.
Suppose you want to return
GuestbookEntry entities by their creation date.
It’s easy to specify these default orderings:
<order> <order-column name="createDate" order-by="desc" /> </order>
You can enter
desc for ascending or descending order.
Now that you know how to order your service entities, the last thing to do is to define the finder methods for retrieving entity instances from the database.