hibernate映射主键和复合键之间的一对多关系

Question

我正在努力解决hibernate映射问题，即在订单表的主键和带有一些额外列的产品购物车的复合键之间映射一对多关系

public class OrderDetails implements Serializable {

/**
 * 
 */
private static final long serialVersionUID = 1L;

@Id
@Column(name="ORDERID")
@GeneratedValue(strategy=GenerationType.IDENTITY)
private Integer orderId;

@Column(name="ORDER_DATE")
private Date orderDate= new Date();
//other fields and getter setter
.....
.....

产品购物车表具有组合键购物车ID和产品ID

@Entity
@Table(name="PRODUCT_CART")
@AssociationOverrides({
    @AssociationOverride(name="pk.shopCart", joinColumns=@JoinColumn(name="CARTID")),
    @AssociationOverride(name="pk.product", joinColumns=@JoinColumn(name="PRODUCTID"))
})
public class ProductCart implements Serializable {

/**
 * 
 */
private static final long serialVersionUID = 1L;

@EmbeddedId
private ProductCartId pk = new ProductCartId();

@Column(name="QUANTITY")
private Integer selectedQuantity=1;

@Column(name="TOTAL")
private double total=0.0;
//other fields and getter setter
.....
.....

我试着跟踪但没有成功

@Entity
@Table(name="PRODUCTCART_ORDERDETAILS")
@AssociationOverrides({
@AssociationOverride(name="pcoPK.orderDetails",joinColumns=@JoinColumn(name="ORDERID"))    ,
@AssociationOverride(name="pcoPK.pk", joinColumns=       
    {@JoinColumn(name="pk.shopCart",referencedColumnName="CARTID"),
    @JoinColumn(name="pk.product",referencedColumnName="PRODUCTID") }) })

public class ProductCartOrder implements Serializable {

/**
 * 
 */
private static final long serialVersionUID = -2348674131019001487L;

@EmbeddedId
private ProductCartOrderId pcoPK = new ProductCartOrderId();

@Column(name="QUANTITY")
private Integer quantity;

@Column(name="PRICE")
private double price;

@Transient
public OrderDetails getOrderDetails(){
    return getPcoPK().getOrderDetails();
}
public void setOrderDetails(OrderDetails orderDetails){
    getPcoPK().setOrderDetails(orderDetails);
}

@Transient
public ProductCartId getProductCartId(){
    return getPcoPK().getPk();
}
public void setProductCartId(ProductCartId pk){
getPcoPK().setPk(pk);
}

有人能帮我实现这一点吗？下面是错误消息

原因：组织。冬眠AnnotationException：非法尝试使用mappedBy关联pcoPK定义@JoinColumn。组织pk。冬眠cfg公司。Ejb3JoinColumn。在org上构建JoinColumn（Ejb3JoinColumn.java:152）。冬眠cfg公司。Ejb3JoinColumn。在org上构建JoinColumns（Ejb3JoinColumn.java:127）。冬眠cfg公司。AnnotationBinder。processElementAnnotations（AnnotationBinder.java:1212）位于org。冬眠cfg公司。AnnotationBinder。位于org的fillComponent（AnnotationBinder.java:1841）。冬眠cfg公司。AnnotationBinder。bindId（AnnotationBinder.java:1878）

Answer 1

经过大量的研究，我找不到解决方案，我用另一种方式做到了这一点。我在订单详细信息和产品之间创建了多对多的关系，并为产品购物车中的每个元素手动创建了一些额外的列ID、价格、数量和插入值，通过for循环。

public class Product implements Serializable {
@OneToMany(mappedBy="product")
private Set<ProductOrder> productOrder;
...//other fields and getter setter
}

public class OrderDetails implements Serializable {
@OneToMany(mappedBy="orderDetails")
private Set<ProductOrder> productOrder;
...//other fields and getter setter
}

public class ProductOrder {

@Id
@Column(name="PRODUCT_ORDER_ID")
@GeneratedValue(strategy=GenerationType.IDENTITY)
private int prductOrderId;

@ManyToOne
private OrderDetails orderDetails;

@ManyToOne
private Product product;
...//other fields and getter setter
}

在我想要保存ProductCart产品的controller类中，我执行了以下操作

List<ProductCart> productList = new ArrayList<ProductCart>();
    productList=productCartService.getCartProducts(shopCart);

    ProductOrder orderedProducts = new ProductOrder();

    for (ProductCart productCarts : productList) {
        orderedProducts.setOrderDetails(orderDetails);
        orderedProducts.setProduct(productCarts.getPk().getProduct());
        orderedProducts.setPrice(productCarts.getPk().getProduct().getPrice());
        orderedProducts.setQuantity(productCarts.getSelectedQuantity());
        productOrderService.addOrderProducts(orderedProducts);
        }