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petshop充分体现了面向接口编程的思想就是给你一个接口你别管我是怎么实现的你只管用别说其他的 namespace PetShopBLL { /// <summary> /// A business component to manage products /// </summary> public class Product { // Get an instance of the Product DAL using the DALFactory // Making this static will cache the DAL instance after the initial load private static readonly IProduct dal = PetShopDALFactoryDataAccessCreateProduct(); 在bll层这里使用创建Produce的接口你只管调用他的方法 namespace PetShopIDAL { /// <summary> /// Interface for the Product DAL /// </summary> public interface IProduct { /// <summary> /// Method to search products by category name /// </summary> /// <param name=category>Name of the category to search by</param> /// <returns>Interface to Model Collection Generic of search results</returns> IList<ProductInfo> GetProductsByCategory(string category); /// <summary> /// Method to search products by a set of keyword /// </summary> /// <param name=keywords>An array of keywords to search by</param> /// <returns>Interface to Model Collection Generic of search results</returns> IList<ProductInfo> GetProductsBySearch(string[] keywords); /// <summary> /// Query for a product /// </summary> /// <param name=productId>Product Id</param> /// <returns>Interface to Model ProductInfo for requested product</returns> ProductInfo GetProduct(string productId); } 这里是定义了Product接口和他的虚方法 namespace PetShopSQLServerDAL { public class Product : IProduct { //Static constants private const string SQL_SELECT_PRODUCTS_BY_CATEGORY = SELECT ProductProductId ProductName ProductDescn ProductImage ProductCategoryId FROM Product WHERE ProductCategoryId = @Category; private const string SQL_SELECT_PRODUCTS_BY_SEARCH = SELECT ProductId Name Descn ProductImage ProductCategoryId FROM Product WHERE ((; private const string SQL_SELECT_PRODUCTS_BY_SEARCH = LOWER(Name) LIKE % + {} + % OR LOWER(CategoryId) LIKE % + {} + %; private const string SQL_SELECT_PRODUCTS_BY_SEARCH = ) OR (; private const string SQL_SELECT_PRODUCTS_BY_SEARCH = )); private const string SQL_SELECT_PRODUCT = SELECT ProductProductId ProductName ProductDescn ProductImage ProductCategoryId FROM Product WHERE ProductProductId = @ProductId; private const string PARM_CATEGORY = @Category; private const string PARM_KEYWORD = @Keyword; private const string Parm_PRODUCTID = @ProductId; /// <summary> /// Query for products by category /// </summary> /// <param name=category>category name</param> /// <returns>A Generic List of ProductInfo</returns> public IList<ProductInfo> GetProductsByCategory(string category) { IList<ProductInfo> productsByCategory = new List<ProductInfo>(); 这里是实现Product接口的类 namespace PetShopDALFactory { /// <summary> /// This class is implemented following the Abstract Factory pattern to create the DAL implementation /// specified from the configuration file /// </summary> public sealed class DataAccess { // Look up the DAL implementation we should be using private static readonly string path = ConfigurationManagerAppSettings[WebDAL]; private static readonly string orderPath = ConfigurationManagerAppSettings[OrdersDAL]; private DataAccess() { } public static PetShopIDALICategory CreateCategory() { string className = path + Category; return (PetShopIDALICategory)AssemblyLoad(path)CreateInstance(className); } 这里是利用工厂模式来映射你需要你想创建哪一个 后面还有一些消息队列MSMQMessage利用cache缓存以后达到异步处理购物车里订单的功能！ 刚开始看应先从先从Product入口关于Product的一些操作串联起来看一遍！ |
