I have two entities with unidirectional lazy relations. And one of them has a named entity graph. Here are the entities (getters and setter are not listed due to readability):
@Entity
@NamedEntityGraph (
name = "Sms.fetchSims",
attributeNodes = {
@NamedAttributeNode("sim")
}
)
public class Sms {
@Id
@GeneratedValue (strategy = GenerationType.AUTO)
private Long id;
@NotNull
private Timestamp date;
@NotNull
private String sender;
@NotNull
private String content;
@NotNull
private Direction direction;
@NotNull
@ManyToOne (fetch = FetchType.LAZY, cascade = CascadeType.PERSIST)
private Sim sim;
}
@Entity
public class Sim {
@Id
@GeneratedValue (strategy = GenerationType.AUTO)
private long id;
@NotNull
private long IMSI;
private String MSISDN;
private String provider;
private Timestamp lockedDate;
}
When I fetch any sms using the entity manager find() method with this entity graph, I get an sms with a sim. But i want to be able to find smses by sim id. That's why i created a criteria api query for that purpose.
CriteriaBuilder cb = entityManager.getCriteriaBuilder();
EntityGraph eg = entityManager.getEntityGraph("Sms.fetchSims");
CriteriaQuery<Sms> cq = cb.createQuery(Sms.class);
Root<Sms> smses = cq.from(Sms.class);
Join<Sms, Sim> sims = smses.join(Sms_.sim);
cq.where(cb.equal(sims.get(Sim_.id), simId));
cq.orderBy(cb.desc(smses.get(Sms_.date)));
return entityManager
.createQuery(cq)
.setHint("javax.persistence.fetchgraph", eg)
.setMaxResults(1000)
.getResultList();
As you see, i set the entity graph here using a setHint method of the typed query, but sim is never fetched, it's fields are not even listed in the result sql. What could i do to make entity graph work with criteria api?
I know I can typecast smses.fetch(Sms_.sim) to Join, but i get ugly warnings, and this method looks like a dirty hack to me.
I'm working with hibernate and wildfly-8.2.0.Final application server.
Aucun commentaire:
Enregistrer un commentaire