Hi Guys,
Can someone help me interpret a limitation specified in section 7.2:
- Once OpenJPA eager-joins into a class, it cannot issue any further
eager to-many joins or parallel selects from that class in the same query.
To-one joins, however, can recurse to any level.
So, if I have the following code, am I hitting this limitation?
public abstract class AbstractCustomer implements Serializable {
...
@OneToOne(fetch = FetchType.EAGER)
@JoinColumns([EMAIL PROTECTED](name="OPEN_ORDER", referencedColumnName =
"ORDER_ID")})
protected Order openOrder;
public class Order implements Serializable {
...
@OneToMany(fetch=FetchType.LAZY)
@ElementJoinColumn(name="ORDER_ID",referencedColumnName="ORDER_ID")
protected Set<LineItem> lineitems;
In order to load all LineItems Eagerly, I have to start from Order (vs
starting from Customer).
If I do an em.find() on Customer. Even if I specify Eager from Order to
LineItems, it will not load the LineItems Eagerly. Only if I do an
em.findon the Order will I get the Join because LineItems is a
collection.
Have I interpretted the limitation correctly? And, if so, can somebody
provide some background on this limitation and what it would take to remove
it? I'm still not 100% comfortable with this area of the code... :-)
Thanks!
Kevin
