orderservice.cs

一个网上书店的源码

//============================================================
// Producnt name:		BoBoARTS.DBMad
// Version: 			1.0
// Coded by:			Shen Bo ([e-mail])
// Auto generated at: 	2007-9-6 17:40:18
//============================================================

using System;
using System.Collections.Generic;
using System.Text;
using System.Data;
using System.Data.SqlClient;
using MyBookShop.Models;

namespace MyBookShop.DAL
{
	public static partial class OrderService
	{
        public static Order AddOrder(Order order)
		{
            string sql =
				"INSERT Orders (OrderDate, UserId, TotalPrice)" +
				"VALUES (@OrderDate, @UserId, @TotalPrice)";
				
			sql += " ; SELECT @@IDENTITY";

            try
            {
				SqlParameter[] para = new SqlParameter[]
				{
					new SqlParameter("@UserId", order.User.Id), //FK
					new SqlParameter("@OrderDate", order.OrderDate),
					new SqlParameter("@TotalPrice", order.TotalPrice)
				};
				
                int newId = DBHelper.GetScalar(sql, para);
				return GetOrderById(newId);
            }
            catch (Exception e)
            {
				Console.WriteLine(e.Message);
                return null;
            }
		}
		
        public static void DeleteOrder(Order order)
		{
			DeleteOrderById( order.Id );
		}

        public static void DeleteOrderById(int id)
		{
            string sql = "DELETE Orders WHERE Id = @Id";

            try
            {
				SqlParameter[] para = new SqlParameter[]
				{
					new SqlParameter("@Id", id)
				};
			
                DBHelper.ExecuteCommand(sql, para);
            }
            catch (Exception e)
            {
				Console.WriteLine(e.Message);
				throw e;
            }
		}
		
        public static void ModifyOrder(Order order)
        {
            string sql =
                "UPDATE Orders " +
                "SET " +
	                "UserId = @UserId, " + //FK
	                "OrderDate = @OrderDate, " +
	                "TotalPrice = @TotalPrice " +
                "WHERE Id = @Id";


            try
            {
				SqlParameter[] para = new SqlParameter[]
				{
					new SqlParameter("@Id", order.Id),
					new SqlParameter("@UserId", order.User.Id), //FK
					new SqlParameter("@OrderDate", order.OrderDate),
					new SqlParameter("@TotalPrice", order.TotalPrice)
				};

				DBHelper.ExecuteCommand(sql, para);
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
				throw e;
            }

        }		

        public static IList<Order> GetAllOrders()
        {
            string sqlAll = "SELECT * FROM Orders";
			return GetOrdersBySql( sqlAll );
        }
		
        public static Order GetOrderById(int id)
        {
            string sql = "SELECT * FROM Orders WHERE Id = @Id";

			int userId;

            try
            {
                SqlDataReader reader = DBHelper.GetReader(sql, new SqlParameter("@Id", id));
                if (reader.Read())
                {
                    Order order = new Order();

					order.Id = (int)reader["Id"];
					order.OrderDate = (DateTime)reader["OrderDate"];
					order.TotalPrice = (decimal)reader["TotalPrice"];
					userId = (int)reader["UserId"]; //FK

                    reader.Close();

					order.User = UserService.GetUserById(userId);
					
                    return order;
                }
                else
                {
                    reader.Close();
                    return null;
                }
            }
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
                return null;
            }
        }
		
		
		
		
        private static IList<Order> GetOrdersBySql( string safeSql )
        {
            List<Order> list = new List<Order>();

			try
			{
				DataTable table = DBHelper.GetDataSet( safeSql );
				
				foreach (DataRow row in table.Rows)
				{
					Order order = new Order();
					
					order.Id = (int)row["Id"];
					order.OrderDate = (DateTime)row["OrderDate"];
					order.TotalPrice = (decimal)row["TotalPrice"];
					order.User = UserService.GetUserById((int)row["UserId"]); //FK
	
					list.Add(order);
				}
	
				return list;
			}
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
                return null;
            }

        }
		
        private static IList<Order> GetOrdersBySql( string sql, params SqlParameter[] values )
        {
            List<Order> list = new List<Order>();

			try
			{
				DataTable table = DBHelper.GetDataSet( sql, values );
				
				foreach (DataRow row in table.Rows)
				{
					Order order = new Order();
					
					order.Id = (int)row["Id"];
					order.OrderDate = (DateTime)row["OrderDate"];
					order.TotalPrice = (decimal)row["TotalPrice"];
					order.User = UserService.GetUserById((int)row["UserId"]); //FK
	
					list.Add(order);
				}
	
				return list;
			}
            catch (Exception e)
            {
                Console.WriteLine(e.Message);
                return null;
            }
			
        }
		
	}
}