初识三层架构(6)

 8 {
 9     class PersonBLL
10     {
11         //增加字段
12         public static int AddNew(Person model)//返回新添加字段的主键
13         {
14             return PersonDAL.AddNew(model);
15         }
16         //删除操作
17         public static int Delete(int id)
18         {
19             return PersonDAL.Delete(id);
20         }
21         //更新数据
22         public static int UpDate(Person model)
23         {
24             if (model.Age < 0)
25             {
26                 throw new Exception("年龄不能为负数！");
27             }
28             return PersonDAL.UpDate(model);
29         }
30         //查询一条数据
31         public static Person GetPerson(int id)
32         {
33             return PersonDAL.GetPerson(id);
34         }
35         //查询所有数据
36         public static IEnumerable<Person> GetAllPerson()
37         {
38             return PersonDAL.GetAllPerson();
39         }
40     }
41 }

  Model
1 namespace 三层架构.Model
2 {
3     class Person
4     {
5         public int Id { get; set; }
6         public int Age { get; set;}
7         public string Name { get; set; }
8     }
9 }