Hibernate -- 组合主键实例

Order Item一般由product，order组成。 下面就是Order Item

1 OrderDetailId

　　
import javax.persistence.Column;
import javax.persistence.Embeddable;

  

@Embeddable

public class OrderDetailId  implements java.io.Serializable {

    // Fields   

     private Integer purchaseordernumber;
     private String productcode;

    // Constructors

    /** default constructor */
    public OrderDetailId() {
    }

   
    /** full constructor */
    public OrderDetailId(Integer purchaseordernumber, String productcode) {
        this.purchaseordernumber = purchaseordernumber;
        this.productcode = productcode;
    }

  
    // Property accessors

    @Column(name="PURCHASEORDERNUMBER", nullable=false)

    public Integer getPurchaseordernumber() {
        return this.purchaseordernumber;
    }
   
    public void setPurchaseordernumber(Integer purchaseordernumber) {
        this.purchaseordernumber = purchaseordernumber;
    }

    @Column(name="PRODUCTCODE", nullable=false, length=15)

    public String getProductcode() {
        return this.productcode;
    }
   
    public void setProductcode(String productcode) {
        this.productcode = productcode;
    }
  

 

   public boolean equals(Object other) {
         if ( (this == other ) ) return true;
   if ( (other == null ) ) return false;
   if ( !(other instanceof OrderDetailId) ) return false;
   OrderDetailId castOther = ( OrderDetailId ) other;
        
   return ( (this.getPurchaseordernumber()==castOther.getPurchaseordernumber()) || ( this.getPurchaseordernumber()!=null && castOther.getPurchaseordernumber()!=null && this.getPurchaseordernumber().equals(castOther.getPurchaseordernumber()) ) )
 && ( (this.getProductcode()==castOther.getProductcode()) || ( this.getProductcode()!=null && castOther.getProductcode()!=null && this.getProductcode().equals(castOther.getProductcode()) ) );
   }
  
   public int hashCode() {
         int result = 17;
        
         result = 37 * result + ( getPurchaseordernumber() == null ? 0 : this.getPurchaseordernumber().hashCode() );
         result = 37 * result + ( getProductcode() == null ? 0 : this.getProductcode().hashCode() );
         return result;
   }  

}

 

2. OrderDetail

　　import javax.persistence.AttributeOverride;
import javax.persistence.AttributeOverrides;
import javax.persistence.Column;
import javax.persistence.EmbeddedId;
import javax.persistence.Entity;
import javax.persistence.JoinColumn;
import javax.persistence.Table;
import javax.persistence.IdClass;
import javax.persistence.ManyToOne;
/**
 * OrderDetail entity. @author MyEclipse Persistence Tools
 */
@Entity
@Table(name="ORDERDETAIL"
    ,schema="dbo"
    ,catalog="ssh"
)
//@IdClass(OrderDetailId.class)
public class OrderDetail  implements java.io.Serializable {

    // Fields   

     private OrderDetailId id;
     private Integer quantityordered;
     private double priceeach;
     private short orderlinenumber;

     private Order order;
     private Product product;
    // Constructors

    /** default constructor */
    public OrderDetail() {
    }

 /** minimal constructor */
    public OrderDetail(OrderDetailId id) {
        this.id = id;
    }
   
    /** full constructor */
    public OrderDetail(OrderDetailId id, Integer quantityordered, double priceeach, short orderlinenumber) {
        this.id = id;
        this.quantityordered = quantityordered;
        this.priceeach = priceeach;
        this.orderlinenumber = orderlinenumber;
    }

  
    // Property accessors
    @EmbeddedId
   
    @AttributeOverrides( {
        @AttributeOverride(name="purchaseordernumber", column=@Column(name="PURCHASEORDERNUMBER", nullable=false) ),
        @AttributeOverride(name="productcode", column=@Column(name="PRODUCTCODE", nullable=false, length=15) ) } )

    public OrderDetailId getId() {
        return this.id;
    }
   
    public void setId(OrderDetailId id) {
        this.id = id;
    }
   
    @Column(name="QUANTITYORDERED")

    public Integer getQuantityordered() {
        return this.quantityordered;
    }
   
    public void setQuantityordered(Integer quantityordered) {
        this.quantityordered = quantityordered;
    }
   
    @Column(name="PRICEEACH", precision=10)

    public double getPriceeach() {
        return this.priceeach;
    }
   
    public void setPriceeach(double priceeach) {
        this.priceeach = priceeach;
    }
   
    @Column(name="ORDERLINENUMBER")

    public short getOrderlinenumber() {
        return this.orderlinenumber;
    }
   
    public void setOrderlinenumber(short orderlinenumber) {
        this.orderlinenumber = orderlinenumber;
    }

    @ManyToOne(targetEntity=Order.class)
    @JoinColumn(name="PURCHASEORDERNUMBER" , insertable=false, updatable=false)
 public Order getOrder() {
  return order;
 }

 public void setOrder(Order order) {
  this.order = order;
 }
  @ManyToOne(targetEntity=Product.class)
  @JoinColumn(name="PRODUCTCODE" , insertable=false, updatable=false)
 public Product getProduct() {
  return product;
 }

 public void setProduct(Product product) {
  this.product = product;
 }
}

 

3. 在Order怎么用

　　@OneToMany(mappedBy="order",fetch = FetchType.EAGER)
    @JoinColumn(name="purchaseordernumber")
 public List<OrderDetail> getOrderDetails() {
  return orderDetails;
 }
 public void setOrderDetails(List<OrderDetail> orderDetails) {
  this.orderDetails = orderDetails;
 }

 

Jsp显示

<table id="list" cellspacing="0">
        <tr>
          <td><s:text name="order.orderCode"/></td>
          <td>order date</td>
          <td> requireddate</td>
          <td> shippeddate</td>
        </tr>
   
    <s:iterator value="orders">
        <tr>
          <td><input type="checkbox" name="order.purchaseordernumber" value="${purchaseordernumber}">${purchaseordernumber}</td>
          <td><s:text name="global.format.date"><s:param value="orderdate"></s:param></s:text></td>
   <td><s:text name="global.format.date"><s:param value="requireddate"></s:param></s:text></td>
   <td><s:text name="global.format.date"><s:param value="shippeddate"></s:param></s:text></td>
   <td><a href="${pageContext.request.contextPath}/order_delete.action?order.purchaseordernumber=${purchaseordernumber}">Delete Order</a></td>
        </tr>
     </s:iterator>
    </table>