Question

销售订单实体。

@Entity
@Table(name = "sales_orders")
@IdClass(ReceiptPK.class)
public class SalesOrders implements Serializable {

    public SalesOrders() {
    }
    @Id
    protected Integer receiptID;
    @Id
    protected Integer dateKey;

    public SalesOrders(Integer receiptID, Integer dateKey) {
        this.receiptID = receiptID;
        this.dateKey = dateKey;
    }
//order contains many details
@OneToMany(fetch = FetchType.LAZY, mappedBy = "salesOrders")
@Cascade({CascadeType.SAVE_UPDATE, CascadeType.DELETE})
private Set<SalesOrderDetails> orderDetails = new HashSet<SalesOrderDetails>();

public Set<SalesOrderDetails> getOrderDetails() {
    return orderDetails;
}

public void setOrderDetails(Set<SalesOrderDetails> orderDetails) {
    this.orderDetails = orderDetails;
}
// other property ..

订单详情实体。

@Entity
@Table(name = "sales_order_details")
public class SalesOrderDetails implements Serializable {

    public SalesOrderDetails() {
    }
    private int id;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    // Order holder
    private SalesOrders salesOrders;

    @ManyToOne
    @JoinColumns({
        @JoinColumn(name = "order_num", referencedColumnName = "receiptID"),
        @JoinColumn(name = "date_key", referencedColumnName = "dateKey")})
    public SalesOrders getSalesOrders() {
        return salesOrders;
    }

    public void setSalesOrders(SalesOrders salesOrders) {
        this.salesOrders = salesOrders;
    }
     // other property ...

我的问题：当我尝试删除不影响sales_order_details的订单项时。

            SalesOrders saleOrder = (SalesOrders) getSession().get(SalesOrders.class ,new ReceiptPK(receiptID,dateKey));
            saleOrder.getOrderDetails().remove(someDetails);
            getSession().beginTransaction();
            getSession().saveOrUpdate(saleOrder);
            getSession().getTransaction().commit();

但someDetails未删除。

- 任何帮助将不胜感激......

Answer 1

我认为您必须提交相同的交易。

getSession().getTransaction().begin();
getSession().saveOrUpdate(saleOrder);
getSession().getTransaction().commit();

Answer 2

对于双向关联，您应该（必须）始终确保正确设置关联。

不允许直接访问您的收藏集。
提供添加和删除修改方法。

public Set<SalesOrderDetails> getOrderDetails() {
  //force to use add/remove to ensure consistent object model
  return Collections.unmodifiableSet(orderDetails);
}

public void addOrderDetails(SalesOrderDetails salesOrderDetails){
 orderDetails.add(salesOrderDetails);
 salesOrderDetails.setSalesOrders(this); //important
}

public void removeOrderDetails(SalesOrderDetails salesOrderDetails){
 orderDetails.remove(salesOrderDetails);
 salesOrderDetails.setSalesOrder(null); //important
}

此外，您是否在Entitites上实现了equals（）和hashCode（），即当您调用salesOrder.getOrderDetails（）时，remove（someDetails）是否真正从集合中删除了什么？

如果你没有在SalesOrderDetails上实现equals（）和hashCode（），可能不会。

Fianlly，你大喊将OneToMany映射上的orphanRemoval标志设置为true：

http://en.wikibooks.org/wiki/Java_Persistence/Relationships#Orphan_Removal_.28JPA_2.0.29

hibernate更新一对多项设置

2 个答案: