How can I retrieve the foreign key from a JPA ManyToOne mapping without hitting the target table?

Question

I have the following two annotated classes that I use to build a graph:

@Entity
@Table(name = \"Edge\")
public class Edge
{
    /* some code omitted for brev         


        

Answer 1

I think you should try to optimize your query rather than change the mapping. For example, the following query fetches the whole graph at once (tested in Hibernate):

List nodes = em.createQuery(
            "SELECT DISTINCT n FROM Node n LEFT JOIN FETCH n._rgOutbound")
            .getResultList();