Hibernate JPA ManyToOne复合密钥

Question

@Embeddable
public class DealerUserPk implements Serializable {

    private Integer dealerDetail;
    private Integer userDetail;

@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;

@Entity
@Table(name = "dealer_detail", schema = "account") 
public class DealerDetail implements Serializable {

    @Id
    private Integer id;

用户详细信息

@Entity
@Table(name = "user_detail", schema = "account") 
public class UserDetail implements Serializable {

    @Id
    private Integer id;

有人能看出我做错了什么吗？

Answer 1

这是正确的：

@Embeddable
public class DealerUserPk implements Serializable {

    private Integer dealerDetail;
    private Integer userDetail;

>

但您的DealerUser是用embeddable注释的，它应该是@entity，因为您正在使用@table注释。

需要按如下方式添加MapsId

 @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;

用那个试试。