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我正在努力解决映射订单表的主键和产品购物车的复合键之间的一对多关系以及一些额外列的休眠映射问题

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
.....
.....

Product Cart 表有一个复合键 CART ID 和 PRODUCT 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
.....
.....

我尝试关注但不工作

@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);
}

有人可以帮我实现这个吗？下面是错误信息

引起：org.hibernate.AnnotationException：非法尝试使用 mappedBy 关联定义 @JoinColumn：在 org.hibernate.cfg.Ejb3JoinColumn.buildJoinColumn(Ejb3JoinColumn.java:152) 在 org.hibernate.cfg.Ejb3JoinColumn 的 pcoPK.pk。 buildJoinColumns(Ejb3JoinColumn.java:127) at org.hibernate.cfg.AnnotationBinder.processElementAnnotations(AnnotationBinder.java:1212) at org.hibernate.cfg.AnnotationBinder.fillComponent(AnnotationBinder.java:1841) at org.hibernate.cfg.AnnotationBinder .bindId(AnnotationBinder.java:1878)

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1 回答 1

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经过大量研究，我找不到解决方案，我以另一种方式完成了它。我通过 for 循环为产品购物车中的每个元素手动创建了 OrderDetails 和 Product 之间的多对多关系，其中包含一些额外的列 ID、价格、数量和插入值。

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
}

在我想保存 ProductCart 产品的控制器类中，我做了以下操作

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);
        }
于 2014-07-09T08:40:15.243 回答