Hibernate / JPA是否可以填写引用本身,还是我必须首先保留实体A,以便获得可以设置为实体B的ID?
在此示例中,我具有以下实体:
@Entity
class A(uuid: UUID? = null,
@OneToMany(
mappedBy = "aUUID",
cascade = [CascadeType.ALL],
fetch = FetchType.LAZY,
orphanRemoval = true)
val b: List<B>
) : BaseEntity(uuid)
@Entity
class B(uuid: UUID? = null,
@Column(nullable = false) val aUUID: UUID,
) : BaseEntity(uuid)
B用外键指向A
答案 0 :(得分:0)
您可以将两个实体保持在一起(不是完全针对这种情况,而是逻辑相同):
A a = new A();
a.setBList(new ArrayList());
B b = new B();
a.getBList().add(b);
yourJpaRepository.save(a); // will persist both entities and add reference