Hibernate不能在双向映射中生成密钥

Question

public class EntityA{
.... //some properties
@OneToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "instructor_detail_id")
private EntityB entityB;

public class EntityB{
...//some properties
@OneToOne(mappedBy = "entityB",cascade = CascadeType.ALL)
private EntityA entityA;

entityManager.getTransaction().begin();
EntityA ea = new EntityA ..//constructor with input arguments
EntityB eb = new EntityB ..//constructor with input arguments
eb.setEntityA(ea);
entityManager.persist(eb);
entityManager.getTransaction().commit();

Answer 1

因为在Entitya和Entityb中都有@onetoone映射。您需要在这两个实体中设置@onetoone对象。

试试这样的东西

public void saveData() {
    EntityA a = new EntityA(...);
    EntityB b = new EntityB(...);
    a.setEntityB(b);
    b.setEntityA(a);

    entityManager.persist(a);
    ...
}

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