Question

Hibernate在外部事务类中从getCurrentPrice返回null。

但是，新的get by id调用会返回当前价格正常的产品。

该如何解决？

这是我的产品类别

@Table(name = "products")
public class Product {//...
@OneToMany(mappedBy = "product", fetch = FetchType.LAZY)
private Set<OrderItem> orderItems = new HashSet<>();}

和OrderItem

@Table(name = "orderItems")
public class OrderItem extends BaseModel {//...
@ManyToOne(fetch = FetchType.EAGER)
@JoinColumn(name = "productId")
private Product product;

@Column
private double currentPrice;
}

还有DAO

@Repository
@Transactional
public class HibernateOrderDao {//...
public Serializable save(Order order) {
    order.getReceiver().getOrdersToReceive().add(order);
    order.getItems().forEach(item -> {
        item.setOrder(order);
        item.getProduct().getOrderItems().add(item);//todo improve by direct sql or...!
    });
    order.getAddresses().forEach(address -> address.getOrders().add(order));

    return super.save(order);
}

但是在外部事务方法中，getCurrentPrice返回null

  private Double calculateItemsCost(final OrderItem item) {
    return item.getProduct().getCurrentPrice()
            * item.getQuantity();
}

Answer 1

如果您可以看到产品ID，请尝试先致电Product product = productService.findById(item.getProduct().getId())，然后再致电item.setProduct(product)

Hibernate从外部事务类中的getCurrentPrice返回null

1 个答案: