Question

我想制作一张桌子，假设桌子的名字是Car。它将有3列，brandId，typeId和sizeId。我希望所有列都是主键。 typeId和sizeId是来自不同表的列。我已经尝试使用@IdClass创建代码。但是，出现错误“找不到超类型”。

这是Entity clas：

@Entity
@IdClass(CarPk.class)
@Table(name = "CAR")
public class Car implements Serializable {
    private static final long serialVersionUID = -1576946068763487642L;
    public Car() {
    }

    public Car(String brandId, TypeId typeId, SizeId sizeId) {
    this.brandId = brandId;
    this.typeId = typeId;
    this.sizeId = sizeId;
    }



   @Id
   @Column(name = "BRAND_ID", nullable = false, length = 20)
   private String brandId;

   @Id
   @ManyToOne
   @JoinColumn(name = "TYPE_ID", nullable = false)
   private TypeId typeId;

    @Id
    @ManyToOne
    @JoinColumn(name = "SIZE_ID", nullable = false)
    private SizeId sizeId;



public String getBrandId() {
    return brandId;
}

public void setBrandId(String brandId) {
    this.brandId= brandId;
}


public TypeId getTypeId() {
    return typeId;
}

public void setTypeId (TypeId typeId) {
    this.typeId= typeId;
}


public SizeId getSizeId() {
    return sizeId;
}

public void setSizeId (SizeId sizeId) {
    this.sizeId= sizeId;
}

}

这是CarPk课程：

public class CarPk implements Serializable {
    private static final long serialVersionUID = -1576946068763487642L;
    public CarPk() {
    }

    public CarPk(String brandId, TypeId typeId, SizeId sizeId) {
    this.brandId = brandId;
    this.typeId = typeId;
    this.sizeId = sizeId;
    }


private String brandId;
private TypeId typeId;
private SizeId sizeId;



public String getBrandId() {
    return brandId;
}

public void setBrandId(String brandId) {
    this.brandId= brandId;
}


public TypeId getTypeId() {
    return typeId;
}

public void setTypeId (TypeId typeId) {
    this.typeId= typeId;
}


public SizeId getSizeId() {
    return sizeId;
}

public void setSizeId (SizeId sizeId) {
    this.sizeId= sizeId;
}

}

这段代码有什么问题？无论如何，谢谢你

@IdClass找不到超类型

0 个答案: