.NET数据库编程求索之路--5.使用ADO.NET实现（三层架构篇-使用List传递数据）（2）

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 //新添命名空间
 6 using HomeShop.Model;
 7 using HomeShop.DAL;
 8 
 9 namespace HomeShop.BLL
10 {
11     public class OrderBiz
12     {
13         private OrderDAO dao;
14 
15         public OrderBiz()
16         {
17             dao = new OrderDAO();
18         }
19 
20         public OrderBiz(string connectionString)
21         {
22             dao = new OrderDAO(connectionString);
23         }
24 
25         public int Add(Order order)
26         {
27             return dao.Add(order);
28         }
29 
30         public int Update(Order order)
31         {
32             return dao.Update(order);
33         }
34 
35         public int Delete(int orderID)
36         {            
37             Order order = this.GetSingle(orderID);
38             return dao.Delete(order);
39         }
40 
41         public List<Order> GetList()
42         {
43             return dao.GetList(null,null);
44         }
45 
46         public List<Order> GetList(string customerName)
47         {
48             return GetList().FindAll(
49                 delegate(Order order)
50                 {
51                     return (order.CustomerName.IndexOf(customerName) >= 0);
52                 });
53         }
54 
55         public Order GetSingle(int orderID)
56         {
57             return GetList().Find(
58                 delegate(Order order)
59                 {
60                     return (order.OrderID == orderID);
61                 }
62                 );
63         }
64 
65     }
66 }

 1 using System;
 2 using System.Collections.Generic;
 3 using System.Linq;
 4 using System.Text;
 5 //新添命名空间
 6 using HomeShop.Model;
 7 using HomeShop.DAL;
 8 
 9 namespace HomeShop.BLL
10 {
11     public class OrderStateBiz
12     {
13         private OrderStateDAO dao;
14 
15         public OrderStateBiz()
16         {
17             dao = new OrderStateDAO();
18         }
19 
20         public OrderStateBiz(string connectionString)
21         {
22             dao = new OrderStateDAO(connectionString);
23         }
24 
25         public List<OrderState> GetList()
26         {
27             return dao.GetList(null, null);
28         }
29     }
30 }