堆棧內存溢出
  簡體   English   中英

JPA / Hibernate復合主前鍵ManyToOne映射

[英]JPA/Hibernate Composite Primary Foriegn Key ManyToOne Mapping

 原文  2016-05-21 00:52:12  0   1    spring/ hibernate/ jpa/ orm/ spring-data-jpa

問題描述

*** 解決-更新了分辨率* **

我有兩個表：

notification-由UserId + NotificationDetail組成的復合鍵

notification_detail-單主鍵

我想使用JPA保留並讀取這些對象，但是無法使ManyToOne映射起作用。

許多通知映射到一個notification_detail 。

表格： 

create table notification(
notification_user_id        int             not null,
notification_detail_id     int              not null,
notification_status_cd      int             not null,
primary key(notification_user_id, notification_detail_id),
constraint pkey_notification_detail foreign key(notification_detail_id) references notification_detail(notification_detail_id),
constraint pkey_notification_status_cd foreign key(notification_status_cd) references lk_notification_status(notification_status_id)
);

create table notification_detail (
notification_detail_id  int             auto_increment,
notification_type_cd    int             not null,
notification_message    varchar(50)     not null,
primary key(notification_detail_id),
constraint pkey_notification_type_cd foreign key(notification_type_cd) references lk_notification_type(notification_type_id)
);

*** 已解決和正確的JPA設置： * ** 

class NotificationId implements Serializable {
    private static final long serialVersionUID = 1L;
    Integer notificationUserId;
    Integer details;
    public Integer getNotificationUserId() {
        return notificationUserId;
    }
    public void setNotificationUserId(Integer notificationUserId) {
        this.notificationUserId = notificationUserId;
    }
    public Integer getDetails() {
        return details;
    }
    public void setDetails(Integer details) {
        this.details = details;
    }
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((details == null) ? 0 : details.hashCode());
        result = prime * result + ((notificationUserId == null) ? 0 : notificationUserId.hashCode());
        return result;
    }
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        NotificationId other = (NotificationId) obj;
        if (details == null) {
            if (other.details != null)
                return false;
        } else if (!details.equals(other.details))
            return false;
        if (notificationUserId == null) {
            if (other.notificationUserId != null)
                return false;
        } else if (!notificationUserId.equals(other.notificationUserId))
            return false;
        return true;
    }
}

@Entity
@Table(name="notification")
@IdClass(NotificationId.class)
public class Notification implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @NotNull
    private Integer notificationUserId;

    @Id
    @NotNull
    @ManyToOne(fetch=FetchType.LAZY, cascade=CascadeType.ALL)
    @JoinColumn(name="notification_detail_id")
    private NotificationDetail details;

    @NotNull
    private Integer notificationStatusCd;

    @NotNull
    private Integer updateUserId;

    public Integer getNotificationUserId() {
        return notificationUserId;
    }

    public void setNotificationUserId(Integer notificationUserId) {
        this.notificationUserId = notificationUserId;
    }

    public NotificationDetail getDetails() {
        return details;
    }

    public void setDetails(NotificationDetail details) {
        this.details = details;
    }

    public Integer getNotificationStatusCd() {
        return notificationStatusCd;
    }

    public void setNotificationStatusCd(Integer notificationStatusCd) {
        this.notificationStatusCd = notificationStatusCd;
    }

    public Integer getUpdateUserId() {
        return updateUserId;
    }

    public void setUpdateUserId(Integer updateUserId) {
        this.updateUserId = updateUserId;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((details == null) ? 0 : details.hashCode());
        result = prime * result + ((notificationStatusCd == null) ? 0 : notificationStatusCd.hashCode());
        result = prime * result + ((notificationUserId == null) ? 0 : notificationUserId.hashCode());
        result = prime * result + ((updateUserId == null) ? 0 : updateUserId.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Notification other = (Notification) obj;
        if (details == null) {
            if (other.details != null)
                return false;
        } else if (!details.equals(other.details))
            return false;
        if (notificationStatusCd == null) {
            if (other.notificationStatusCd != null)
                return false;
        } else if (!notificationStatusCd.equals(other.notificationStatusCd))
            return false;
        if (notificationUserId == null) {
            if (other.notificationUserId != null)
                return false;
        } else if (!notificationUserId.equals(other.notificationUserId))
            return false;
        if (updateUserId == null) {
            if (other.updateUserId != null)
                return false;
        } else if (!updateUserId.equals(other.updateUserId))
            return false;
        return true;
    }

}

@Entity
@Table(name="notification_detail")
public class NotificationDetail implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer notificationDetailId;

    @NotNull
    private Integer notificationTypeCd;

    @NotNull
    private String notificationMessage;

    @OneToMany(fetch=FetchType.LAZY, cascade=CascadeType.ALL, mappedBy="details")
    private Set<Notification> notifications;

    @NotNull
    private Integer updateUserId;

    public Integer getNotificationDetailId() {
        return notificationDetailId;
    }

    public void setNotificationDetailId(Integer notificationDetailId) {
        this.notificationDetailId = notificationDetailId;
    }

    public Integer getNotificationTypeCd() {
        return notificationTypeCd;
    }

    public void setNotificationTypeCd(Integer notificationTypeCd) {
        this.notificationTypeCd = notificationTypeCd;
    }

    public String getNotificationMessage() {
        return notificationMessage;
    }

    public void setNotificationMessage(String notificationMessage) {
        this.notificationMessage = notificationMessage;
    }

    public Set<Notification> getNotifications() {
        return notifications;
    }

    public void setNotifications(Set<Notification> notifications) {
        this.notifications = notifications;
    }

    public void addNotification(Notification notification){
        if(notifications == null)
            notifications = new HashSet<Notification>();
        notifications.add(notification);
    }

    public Integer getUpdateUserId() {
        return updateUserId;
    }

    public void setUpdateUserId(Integer updateUserId) {
        this.updateUserId = updateUserId;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((notificationDetailId == null) ? 0 : notificationDetailId.hashCode());
        result = prime * result + ((notificationMessage == null) ? 0 : notificationMessage.hashCode());
        result = prime * result + ((notificationTypeCd == null) ? 0 : notificationTypeCd.hashCode());
        result = prime * result + ((notifications == null) ? 0 : notifications.hashCode());
        result = prime * result + ((updateUserId == null) ? 0 : updateUserId.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        NotificationDetail other = (NotificationDetail) obj;
        if (notificationDetailId == null) {
            if (other.notificationDetailId != null)
                return false;
        } else if (!notificationDetailId.equals(other.notificationDetailId))
            return false;
        if (notificationMessage == null) {
            if (other.notificationMessage != null)
                return false;
        } else if (!notificationMessage.equals(other.notificationMessage))
            return false;
        if (notificationTypeCd == null) {
            if (other.notificationTypeCd != null)
                return false;
        } else if (!notificationTypeCd.equals(other.notificationTypeCd))
            return false;
        if (notifications == null) {
            if (other.notifications != null)
                return false;
        } else if (!notifications.equals(other.notifications))
            return false;
        if (updateUserId == null) {
            if (other.updateUserId != null)
                return false;
        } else if (!updateUserId.equals(other.updateUserId))
            return false;
        return true;
    }

}

JPA用法： 

NotificationDetail details = new NotificationDetail();
details.setMessage("Hello");
details.setTypeCd(NotificationTypeEnum.INFO);
detail.setUpdateUserId(userId);

Notification notif = new Notification();
notif.setNotifiedUserId(userId);
notif.setStatusCd(NotificationStatusEnum.UNREAD);
notif.setDetails(details);

notificationRepository.save(notif);

*** 現在已解決此錯誤 * **： 

Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Unknown column 'notificati0_.details_notificationDetailId' in 'field list'

*** 原始問題： * **

我嘗試了所有類型的不同配置。 我能想到的最好的事情是我的情況很復雜，因為父對象“ notification”有一個復合鍵“ notification_detail_id”，它也是孩子的主鍵。 這使得Hibernate很難先持久保留子項，然后再獲取密鑰並將其保存給父項。

我意識到我的注釋在某處不正確，但無法弄清楚。

1 個解決方案

解決方案1
 3 已采納  2016-05-21 17:13:22

看起來您正在處理“派生身份”。 更改類，使其看起來像這樣： 

class NotificationId implements Serializable {
    private static final long serialVersionUID = 1L;
    Integer notifiedUserId;
    Integer details;
    ...
}


@Entity
@IdClass(NotificationId.class)
@Table(name="notification")
public class Notification implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @NotNull
    @Column(name="notification_user_id")
    private Integer notifiedUserId;

    @Id
    @NotNull
    @ManyToOne(fetch=FetchType.LAZY, cascade=CascadeType.ALL)
    @JoinColumn(name="notification_detail_id")
    private NotificationDetail details;

    @NotNull
    @Column(name="notification_status_cd")
    private Integer statusCd;

    @Column(name="update_timestamp")
    private Date timestamp;

    ...
}

注意：

  • NotificationId.notificationDetailId已重命名為details以匹配Notification中的相應字段
  • Notification.notificationDetailId已被刪除
  • Notification.details已被標記為@Id

您的字段模型似乎暗示您應該對Notification和User之間的關系執行相同的User 。

JPA 2.1規范的第2.4.1節中討論了派生身份。

暫無
暫無

聲明:本站的技術帖子網頁，遵循CC BY-SA 4.0協議，如果您需要轉載，請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.

相關問題 帶有鏈接類的JPA中的@ManytoOne中的復合主鍵 JPA &amp; Hibernate - 復合主鍵和外鍵 JPA / Hibernate-具有外鍵的復合主鍵 jpa @manytoone創建復合主鍵而不是@id 如何使用JPA（或Hibernate）注釋創建復合主數據庫 休眠映射主鍵和組合鍵之間的一對多關系 我可以告訴Spring Data JPA / Hibernate復合主鍵順序嗎？ 休眠一對多映射，其中一類在多側具有復合主鍵 使用復合主鍵和注釋映射ManyToMany： 休眠-@IdClass @ManyToOne-主鍵也是外鍵
相關標簽
 
粵ICP備18138465號  © 2020-2024 STACKOOM.COM