relation JPA OneToMany

Question

J'ai 3 classes d'entités mappées ci-dessous:

@Table(name = "PROVIDER") 
public class Provider implements Serializable { 

    private static final long serialVersionUID = 1L; 

    @Id 
    @GeneratedValue 
    private long id; 
    private long npi; 
    private String name; 
    private String specialization; 
    @OneToMany(mappedBy = "provider", cascade = REMOVE) 
    @OrderBy 
    private List<Treatment> treatments; 
    @Transient 
    private ITreatmentDAO treatmentDAO; 
    // and so forth 
} 

@Table(name = "PATIENT") 
public class Patient implements Serializable { 

    private static final long serialVersionUID = 1L; 

    @Id 
    @GeneratedValue 
    private long id; 
    private long patientid; 
    private String name; 
    @Temporal(TemporalType.DATE) 
    private Date birthDate; 
    @OneToMany(cascade = REMOVE, mappedBy = "patient") 
    @OrderBy 
    private List<Treatment> treatments; 
    // and so forth 
} 

@Table(name = "TREATMENT") 
public abstract class Treatment implements Serializable { 

    private static final long serialVersionUID = 1L; 

    @Id 
    @GeneratedValue 
    private long id; 
    private String diagnosis; 
    @ManyToOne 
    @JoinColumn(name = "patient_fk", referencedColumnName = "id") 
    private Patient patient; 
    @ManyToOne 
    @JoinColumn(name = "provider_fk", referencedColumnName = "id") 
    private Provider provider; 
    // and so forth 
} 

Quand j'invoque getTreatments de chaque patient ou d'un fournisseur, je me attends JPA à remplir les traitements d'attributs. Cependant, cela ne fonctionne que pour le fournisseur. Peu importe ce que j'essaie, patient.getTreatments() retourne toujours vide.

Qu'est-ce qui me manque?

Voici le test de l'unité sur la fin du serveur:

@Test 
public void TestAddTreatment() throws PatientExn, ProviderExn { 
     GregorianCalendar bd = new GregorianCalendar(); 
     bd.set(1977, 03, 13); 
    Patient patient = this.pf.createPatient(900L, "Orezi.Dauda", bd.getTime()); 
    Provider provider = this.prf.createProvider(6777L, "Sam.OKafor"); 
    this.pdao.getEntityManager().getTransaction().begin(); 
    this.pdao.addPatient(patient); 
    this.pdao.getEntityManager().getTransaction().commit(); 
    this.prdao.getEntityManager().getTransaction().begin(); 
    this.prdao.addProvider(provider); 
    provider.addDrugTreatment(900L, "Malaria", "Chloroquine", (float)5.0); 
    this.prdao.getEntityManager().getTransaction().commit(); 
    List<Long> providerTids = this.prdao.getProviderByNpi(6777L).getTreatmentIds(); 
    List<Long>patientTids = this.pdao.getPatientByPatientId(900L).getTreatmentIds(); 
    assert(providerTids.size() == 1); //Passes 
    assert(patientTids.size() == 1);// Fails 
} 

Answer 1

Remplacez la ligne @OneToMany(cascade = REMOVE, mappedBy = "patient") avec

@OneToMany(cascade = CascadeType.ALL, mappedBy = "patient", orphanRemoval = true) and try it should work 

Answer 2

Vérifiez lors de la création/mettre à jour vos objets que vous ajoutez des deux côtés de la relation .