Question

我正在关注本教程http://www.asp.net/mvc/tutorials/mvc-music-store/mvc-music-store-part-9

（与此不完全相同）

我正试图控制股票。

创建订单时，我想扣除库存量（库存 - 数量（数量））;

我有3张桌子;订单，订单详细信息和产品。

创建OrderDetails列表后，我想修改产品库存。

我不知道如何修改股票？我可以使用'db.OrderDetails.Add（orderDetail）'吗？

你可以帮帮我吗？我给你一些编码。

请指教。谢谢！

public int CreateOrder(Order order)
    {
        decimal orderTotal = 0;

        var cartItems = GetCartItems();

        // Iterate over the items in the cart, adding the order details for each
        foreach (var item in cartItems)
        {
            var orderDetail = new OrderDetails
            {
                productId = item.productId,
                orderId = order.orderId,
                unitPrice = item.priceValue,
                rentalPeriod = item.rentalPeriod,
                startDate = item.dateCreated.AddDays(2),
                endDate = item.dateCreated.AddDays(2 + item.rentalPeriod),
                quantity = item.count
            };


            var productStock = new Product
            {   //Is it right coding??
                stock = item.Product.stock - item.count
            };

            // Set the order total of the shopping cart
            orderTotal += (item.count * item.priceValue);

            //Could be we need some coding here for stock control.
            db.OrderDetails.Add(orderDetail);

            db.SaveChanges();
        }

        // Set the order's total to the orderTotal count
        order.total = orderTotal;

        // Save the order
        db.SaveChanges();

        // Empty the shopping cart
        EmptyCart();

        // Return the OrderId as the confirmation number
        return order.orderId;
    }

的ViewModels

public class ShoppingCartViewModel
{
    public List<Cart> CartItems { get; set; }
    public decimal CartTotal { get; set; }
}

订单明细

public class OrderDetails
{
    [Key] public int orderDetailId { get; set; }
    public int orderId { get; set; }
    public int productId { get; set; }
    public int quantity { get; set; }
    public decimal unitPrice { get; set; }
    public int rentalPeriod { get; set; }
    public DateTime startDate { get; set; }
    public DateTime endDate { get; set; }
    public virtual Product Product { get; set; }
    public virtual Order Order { get; set; }
}

顺序

public class Order
{
    rentalDB db = new rentalDB();

    [Key] public int orderId { get; set; }
    public int customerId { get; set; }
    public decimal total { get; set; }
    public virtual Customer Customer { get; set; }
    public List<OrderDetails> OrderDetails { get; set; }
}

车

public class Cart
{
    [Key]
    public int recordId { get; set; }
    public string cartId { get; set; }
    public int productId { get; set; }
    public decimal priceValue { get; set; }
    public int count { get; set; }
    public int rentalPeriod { get; set; }
    public DateTime dateCreated { get; set; }
    public virtual Product Product { get; set; }
}

Answer 1

此片段：

var productStock = new Product
        {   //Is it right coding??
            stock = item.Product.stock - item.count
        };

        // Set the order total of the shopping cart
        orderTotal += (item.count * item.priceValue);

        //Could be we need some coding here for stock control.
        db.OrderDetails.Add(orderDetail);

        db.SaveChanges();

要在创建新产品之前进行库存检查，您应该确保剩下一些，如果没有，请做一些关于它的事情，如下所示：

if (item.Product.stock - item.Count <= 0) 
{
    //you're out of stock! do something about it here? 
}
else
{
    //do your code above to create the new Product
}

修改：要调整该产品的库存，只需执行以下操作：

而不是这样剪断：

var productStock = new Product
        {   //Is it right coding??
            stock = item.Product.stock - item.count
        };

将其更改为：

item.Product.stock = item.Product.stock - item.count;

这将从产品库存号中减去订购的数量。然后，当您调用以下行（您已在代码中执行此操作）时，更改将保存到数据库中：

db.SaveChanges();

MVC3如何更新多个项目的库存

1 个答案: