0
我有一個雙向關係多對一,在此定義JPA實體:JPA無法在許多新的持久的實體分配到一個關係
@Entity
public class Department implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@SequenceGenerator(name="DEPARTAMENTO_ID_GENERATOR",sequenceName="DEPARTAMENTO_SEQ")
@GeneratedValue(strategy=GenerationType.SEQUENCE,generator="DEPARTAMENTO_ID_GENERATOR")
@Column(name="DEP_ID")
private long id;
@Column(name="DEP_DESC")
private String desc;
//bi-directional many-to-one association to Academico
@OneToMany(mappedBy="department")
private Set<Proffesor> proffesors;
//getters and setters
}
@Entity
@Table(name="ACADEMICOS")
public class Proffesor implements Serializable {
private static final long serialVersionUID = 1L;
@Id
@SequenceGenerator(name="ACADEMICOS_ID_GENERATOR", sequenceName="ACADEMICOS_SEQ")
@GeneratedValue(strategy=GenerationType.SEQUENCE,generator="ACADEMICOS_ID_GENERATOR")
@Column(name="ACD_ID")
private long id;
@ManyToOne(cascade={CascadeType.PERSIST,CascadeType.MERGE})
@JoinColumn(name="ACD_DEPADSCRITO_DEP")
private Department department;
// getters and setters.
}
在事務春季服務後,我有下以這種方式操縱實體的代碼。
@Transactional (propagation=Propagation.REQUIRED)
public void createDepartmentWithExistentProffesor(String desc,Long idAvaiableProf) {
// new department
Department dep = new Department();
dep.setDesc(desc);
HashSet<Proffesor> proffesors = new HashSet<Proffesor>();
dep.setProffesors(proffesors);
// I obtain the correct attached Proffesor entity
Proffesor proffesor=DAOQueryBasic.getProffesorById(idAvaiableProf);
// I asign the relationship beetwen proffesor and department in both directions
dep.addProffesors(proffesor);
// Persists department
DAODataBasic.insertDepartment(dep);
// The id value is not correct then Exception ORA-0221
System.out.println("SERVICIO: Departamento creado con id: " + dep.getId());
}
正如我在新部門的ID堅持的評論說的是不是在事務內部實際的數據庫ID,那麼就產生一個異常
Exception in thread "main" org.springframework.orm.jpa.JpaSystemException: org.hibernate.exception.ConstraintViolationException: Could not execute JDBC batch update
........
Caused by: java.sql.BatchUpdateException: ORA-02291: integrity restiction (HIBERNATE_PRB.FK_ACD2DEP) violated - primary key don't found
我已經在測試試,堅持新的離職者實體與Proffesor沒有關係,我已經看到新部門堅持實體的id在交易中沒有有效的價值,但是在交易之外,該id已經具有正確的價值。 但我需要交易中的正確值。
任何人都可以幫助我嗎? 預先感謝您。
謝謝,我嘗試過,但不起作用。 – 2013-02-14 15:14:49
你有沒有試過合併教授而不是堅持新的部門。我知道這不合乎邏輯。但值得一試。之後** Proffesor proffesor = DAOQueryBasic.getProffesorById(idAvaiableProf); **執行此操作** proffesor.setDepartment(department); entityManager.merge(教授); ** 看看它是否會工作。 – spiritwalker 2013-02-14 23:17:44
在閱讀你的評論之前,我做了它,但還沒有工作。再次感謝您的幫助。 – 2013-02-15 09:02:29