Java 将两个外键列合并到EmbeddedID中

我有两张桌子（商品和超市）。他们有多对多的关系，所以我创建了一个额外的表ProductSupermarket。我希望最后一个表只有一列合并两个外键。到目前为止，我已经实现了这一点，但我一直被ProductSupermarket中的两列所困扰——product\u id和supermarket\u id

产品

超级市场

ProductSupermarketKey

产品超市

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您可以在这里检查：谢谢，但是实现本文所说的我仍然有两个列而不是一个列。您所说的“我希望最后一个表只有一个列合并两个外键”到底是什么意思？我希望表ProductSupermarket有一个列“product\u supermarket\u id”，合并两个主键，例如，“15”-id为1的产品和id为5的超市在“连接”中“合并”？你知道会有冲突，对吧？

@Entity
@Table(name = "product")
public class Product{

   @Id
   @GeneratedValue(strategy= GenerationType.IDENTITY)
   @Column(name = "product_id")
   private Long productID;
   ..

@Entity
@Table(name = "supermarket")
public class Supermarket{

   @Id
   @GeneratedValue(strategy= GenerationType.IDENTITY)
   @Column(name = "supermarket_id")
   private Long supermarketID;
   ...

@Embeddable
public class ProductSupermarketKey implements Serializable {
  @Column(name="product_id")
  private Long productID;

  @Column(name="supermarket_id")
  private Long supermarketID;

  public ProductSupermarketKey (){}

  public ProductSupermarketKey (Long productID, Long supermarketID) {
    this.productID = productID;
    this.supermarketID = supermarketID;
  }

@Entity
@Table(name = "date_event")
public class ProductSupermarket implements Serializable {

  @EmbeddedId
  private ProductSupermarketKey id;

  @ManyToOne(fetch = FetchType.LAZY)
  @JoinColumn(name = "product_id", insertable = false, updatable = false)
  private Product product;

  @ManyToOne(fetch = FetchType.LAZY)
  @JoinColumn(name = "supermarket_id", insertable = false, updatable = false)
  private Supermarket supermarket;