Hibernate 使用@OneToMany关系更新实体

我定义了类

AEntity

与关系

manytone

与

benntity

双向

在课堂上，本蒂和厘米有关系

@Entity
public class AEntity {

    @Id
    private String aId;

    @ManyToOne
    @JoinColumn(name = "b_id", updatable = false)
    private BEntity bEntity;
    
}


@Entity
public class BEntity {

    @Id
    private String bId;

    @OneToMany
    @JsonIgnore
    @JoinColumn(name = "b_id")
    private Set<AEntity> aEntites;
    
    @ManyToOne
    @JoinColumn(name = "cId", updatable = false)
    private CEntity cEntity;
    
}


@Entity
public class CEntity {

    @Id
    private String cId;
    
    @OneToMany(mappedBy = "cEntity", cascade = CascadeType.ALL)
    private Set<BEntity> bEntites;
    
}

---

我认为您在这里缺少了

Cascade

，它将创建子实体（如果不存在）（如您的示例中所示），这就是您要问的吗？

BEntity bEntity = getBEntity(event.agreementId);
            
Set<AEntity> aEntities = bEntity.getAEntites();
aEntities.add(new AEntity(event.aId, bEntity));
            
bEntity.setAEntites(aEntities);
bRepository.save(bEntity);