Question

我正在使用Hibernate和Spring / Spring MVC。我有两个实体，AccommodationRequest和Restriction。这种关系是AccommodationRequest可以有很多限制。

当我使用限制保存AccommodationRequest时，两个结果都会保存到数据库中但限制缺少外键/连接列（accommodationRequestId）。我相信我必须缺少一些东西。任何帮助表示赞赏。

AccommodationRequest的定义是：

@Entity
public class AccommodationRequest {
....

@OneToMany(mappedBy="accommodationRequest",
        targetEntity=Restriction.class,
        fetch=FetchType.EAGER,
        cascade=CascadeType.ALL)
private List<Restriction> restrictions;


public List<Restriction> getRestrictions(){
    return restrictions;
}

public void setRestrictions(List<Restriction> restrictions){
    this.restrictions = restrictions;
}
....

定义限制：

@Entity
public class Restriction {

@Id
@GeneratedValue
private long id;

private String restriction;



@ManyToOne
@JoinColumn(name="accommodationRequestId")
private AccommodationRequest accommodationRequest;

public AccommodationRequest getAccommodationRequest() {
    return accommodationRequest;
}

public void setAccommodationRequest(AccommodationRequest accommodationRequest) {
    this.accommodationRequest = accommodationRequest;
}

以下是执行保存的代码：

Restriction restriction = new Restriction();
restriction.setRestriction("test restrcition 6");
List<Restriction> restrictions = new ArrayList<Restriction>();
restrictions.add(restriction);
long id = accommodationService.saveOrUpdate(accommodationRequest);
accommodationRequest.setRestrictions(restrictions);
accommodationService.saveOrUpdate(accommodationRequest);

Answer 1

您尚未将AccommodationRequest设置为限制。

Restriction restriction = new Restriction();
restriction.setRestriction("test restrcition 6");
restriction.setAccommodationRequest(accommodationRequest); // You have to do this
List<Restriction> restrictions = new ArrayList<Restriction>();
restrictions.add(restriction);
long id = accommodationService.saveOrUpdate(accommodationRequest);
accommodationRequest.setRestrictions(restrictions);
accommodationService.saveOrUpdate(accommodationRequest);

Hibernate One To Many加入列而不是保存

1 个答案: