Question

我无法通过地图设置一对多的Hibernate参考。我有3个表：UserTable，MessageTable和RecipientTable。在这里，收件人表包含有关消息的信息-哪个用户已接收/阅读消息。这意味着每封邮件将具有多个关联的收件人。收件人就像消息的“用户角度”。我希望能够通过该特定邮件的RecipientTable从MessageTable获取receiverId。我尝试按照以下步骤进行操作。

MessageTable.java

@Entity
@Table(name = "MESSAGE")
public class MessageTable {

    private static final long serialVersionUID = 1L;

    @Id
    @Column(name = "MESSAGE_ID", nullable = false)
    private Long messageId;

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "SENDER_ID", nullable = false)    
    private UserTable sender;

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "RECEIVER_ID", nullable = false)    
    private UserTable receiver;

    @OneToMany(mappedBy = "message", cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.EAGER)
    private Map<Long, RecipientTable> recipients = new HashMap<>();

RecipientTable.java

@Entity
@Table(name = "RECIPIENT")
public class RecipientTable {

    private static final long serialVersionUID = 1L;

    @Id
    @Column(name = "RECIPIENT_ID", nullable = false)
    private Long recipientId;

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "SENDER_ID", nullable = false)
    private UserTable sender;

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "RECEIVER_ID", nullable = false)
    private UserTable receiver;

    @ManyToOne(fetch = FetchType.EAGER)
    @JoinColumn(name = "MESSAGE_ID", nullable = false)
    private MessageTable message;

    @Enumerated(EnumType.STRING)
    @Column(name = "SEENSTATUS", nullable = false)
    private SeenStatus seenStatus;

    @Enumerated(EnumType.STRING)
    @Column(name = "RECEPTIONSTATUS", nullable = false)
    private ReceptionStatus receptionStatus;

所以问题出在这一行：

        @OneToMany(mappedBy = "message", cascade = CascadeType.ALL, orphanRemoval = true, fetch = FetchType.EAGER)
    private Map<Long, RecipientTable> recipients = new HashMap<>();

我尝试了各种操作，例如添加@MapKey(name = "receiver.userId")，但都无济于事。实现该目标的正确方法是什么？

通过地图一对多休眠

0 个答案: