Question

我是Hibernate注释映射的新手，我正在尝试执行以下映射，这似乎很简单。一个应用 - ＆gt;可以有多个MissingFacebookAd 问题是MissingFacebookAd有Embeddable复合键，应该是一些如何参考，在我的代码下面请咨询：的 Application.java

        Form imageForm = new Form();
        imageForm.Text = "Screenshot";
        //imageForm.FormBorderStyle = FormBorderStyle.None;
        imageForm.Size = bmpScreenCapture.Size;
        imageForm.BackgroundImageLayout = ImageLayout.Zoom;
        imageForm.BackgroundImage = bmpScreenCapture;
        imageForm.ShowDialog();

MissingFacebookAd.java

Entity
@Cache(region = "application", usage = CacheConcurrencyStrategy.READ_WRITE)
@Table(name= "application")
public class Application implements Serializable {
    private long id;
    private Advertiser advertiser;
    private String name;
    private Set<MissingFacebookAd> missingFacebookAd;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    @Column(name = "id", unique = true, nullable = false)
    public long getId() {
        return id;
    }

    @OneToMany(mappedBy="id",cascade = CascadeType.REMOVE)
    public Set<MissingFacebookAd> getMissingFacebookAdSet() {
        return missingFacebookAd;
    }


    public void setMissingFacebookAd(Set<MissingFacebookAd> missingFacebookAd) {
        this.missingFacebookAd = missingFacebookAd;
    }

    public void setId(long id) {
        this.id = id;
    }

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name="advertiser_id")
    public Advertiser getAdvertiser() {
        return advertiser;
    }

    public void setAdvertiser(Advertiser advertiser) {
        this.advertiser = advertiser;
    }

    @Column(name ="name")
    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }
}

ApplicationAndFbAdgroupId.java （密钥类）

@Entity
@Table(name= "missing_fb_ad")
public class MissingFacebookAd implements Serializable {
    private static final long serialVersionUID = 1L;

    private ApplicationAndFbAdgroupId id;

    public MissingFacebookAd(Application application, long adgroupIdInTarget) {
        ApplicationAndFbAdgroupId id = new ApplicationAndFbAdgroupId(application, adgroupIdInTarget);
        this.id = id;
    }

    private MissingFacebookAd() {
    }

    @EmbeddedId
    public ApplicationAndFbAdgroupId getId() {
        return id;
    }

    public void setId(ApplicationAndFbAdgroupId id) {
        this.id = id;
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        MissingFacebookAd that = (MissingFacebookAd) o;

        if (!id.equals(that.id)) return false;

        return true;
    }
}

由于

Hibernate必须具有与引用的主键相同的列数

0 个答案: