[
Date Prev][
Date Next][
Thread Prev][
Thread Next][
Date Index][
Thread Index]
[
List Home]
|
[eclipselink-users] What's the difference between the JoinFetch Annotation and the Fetch-Query Hint
|
Hello,
I've got a simple one-many Association that I need to query in a single select:
Product (1:N) LocalizedProduct
class Product {
@OneToMany(cascade={CascadeType.PERSIST, CascadeType.REMOVE}, fetch=FetchType.LAZY,
mappedBy="product")
@JoinFetch(value=JoinFetchType.OUTER)
private Set<LocalizedProduct> locals = new HashSet<LocalizedProduct> (13);
}
With the annotation JoinFetch it works like I'd have expected, but it doesn't without the
annotation but giving a QueryHint:
TypedQuery<Product> query = em.createQuery ("SELECT p from Product p", Product.class);
query.setHint(QueryHints.LEFT_FETCH, "p.locals");
It also doesn't work with the query:
TypedQuery<Product> query = em.createQuery ("SELECT p from Product p join fetch p.locals",
Product.class);
In the last two cases I get (N+1) queries created by EL.
What do I miss? What do I have to pay attention to?
Kind Regards, Michael
