Hibernate JPA ManyToOne复合键

我正在尝试设置我的实体以允许pks。 我的数据库包含两个字段，

dealer_detail_id pk user_detail_id pk

两者都在相应的表中加入id。

到目前为止，我已经尝试过这个但没有成功。

@Embeddable public class DealerUserPk implements Serializable { private Integer dealerDetail; private Integer userDetail; 

DealerUser

 @Embeddable @Table(name = "dealer_user", schema = "account") public class DealerUser implements Serializable { @EmbeddedId private DealerUserPk id; @Id @ManyToOne @JoinColumn(name = "dealer_detail_id", referencedColumnName = "id") private DealerDetail dealerDetail; @Id @ManyToOne @JoinColumn(name = "user_detail_id", referencedColumnName = "id") private UserDetail userDetail; 

DealerDetail

 @Entity @Table(name = "dealer_detail", schema = "account") public class DealerDetail implements Serializable { @Id private Integer id; 

UserDetail

 @Entity @Table(name = "user_detail", schema = "account") public class UserDetail implements Serializable { @Id private Integer id; 

谁能发现我做错了什么？

Answer 1

这是对的：

 @Embeddable public class DealerUserPk implements Serializable { private Integer dealerDetail; private Integer userDetail; 

1. 但是你的DealerUser带有嵌入式注释，它应该是@Entity，因为你正在使用@Table注释。

2. 需要添加MapsId，如下所示

     @Entity @Table(name = "dealer_user", schema = "account") public class DealerUser implements Serializable { @EmbeddedId private DealerUserPk id; @MapsId("dealerDetail") @ManyToOne @JoinColumn(name = "dealer_detail_id", referencedColumnName = "id") private DealerDetail dealerDetail; @Id @MapsId("userDetail") @JoinColumn(name = "user_detail_id", referencedColumnName = "id") private UserDetail userDetail; 

试试吧。

Answer 2

试试这个

  @Embeddable public class DealerUserPk implements Serializable { @ManyToOne private DealerDetail dealerDetail; @ManyToOne private UserDetail userDetail; public void setDealerDetail(DealerDetail dealerDetail) { this.dealerDetail=dealerDetail; } public DealerDetail getDealerDetail(){ return this.dealerDetail; } public void setUserDetail(UserDetail userDetail) { this.userDetail=userDetail; } public UserDetail getUserDetail() { return this.userDetail; } } 

和

  @Entity @Table(name = "dealer_user") public class ProductItem { @Id private DealerUserPk id= new DealerUserPk(); // --- For bidirectional association--- @SuppressWarnings("unused") @Column(name="dealer_detail_id", nullable=false, updatable=false, insertable=false) private Integer dealerDetail; @SuppressWarnings("unused") @Column(name="user_details_id", nullable=false, updatable=false, insertable=false) private Integer userDetail; // --- public void setDealerDetail(DealerDetail dealerDetail) { id.setDealerDetail(dealerDetail); } public DealerDetail getDealerDetail(){ return id.getDealerDetail(); } public void setUserDetail(UserDetail userDetail) { id.setUserDetail(userDetail); } public UserDetail getUserDetail() { return id.getUserDetail(); } }