实现多数据库支持的小程序----.net学习笔记

 1  1  class Admin
 2  2     {
 3  3         public Admin() { }
 4  4 
 5  5         public Admin(DbDataReader dr)
 6  6         { 
 7  7             this.Id = dr["id"].ToString();
 8  8             this.Password = dr["password"].ToString();
 9  9         }
10 10 
11 11         String id;
12 12 
13 13         public String Id
14 14         {
15 15             get { return id; }
16 16             set { id = value; }
17 17         }
18 18         String password;
19 19 
20 20         public String Password
21 21         {
22 22             get { return password; }
23 23             set { password = value; }
24 24         }

 1   abstract class AdminBaseMgr
 2     {
 3 
 4         public abstract bool insert(Admin admin);
 5         public abstract bool delete(Admin admin);
 6         public abstract bool delete(String id);
 7         public abstract bool update(Admin admin);
 8         public abstract Admin getAdminById(Admin admin);
 9         public abstract Admin getAdminById(String id);
10 
11     }

 1 class AdminSqliteMgr : AdminBaseMgr
 2     {
 3         private AdminSqliteMgr() { }
 4 
 5         private static AdminSqliteMgr adminMgr = null;
 6 
 7         public static AdminBaseMgr getAdminMgr()
 8         {
 9             if (adminMgr != null)
10             {
11                 return adminMgr;
12             }
13             else
14             {
15 
16                 return (adminMgr = new AdminSqliteMgr());
17             }
18         }
19         public override bool insert(Admin admin)
20         {
21            /* String sql = "insert into admin values (@id,@password)";
22             SQLiteParameter[] p = { new SQLiteParameter("@id","root"),
23                                     new SQLiteParameter("@password","root")
24                                 };
25             */
26             String sql = "insert into admin values (‘root‘,‘root‘)";
27 
28             return SqliteHelper.executeNonQuary(sql) == 1;
29         }
30 
31         public override bool delete(Admin admin)
32         {
33            return  delete(admin.Id);
34         }
35 
36         public override bool delete(string id)
37         {
38             String sql = "delete from admin where id=@id";
39             SQLiteParameter p = new SQLiteParameter("@id",id);
40             return SqliteHelper.executeNonQuary(sql,p)==1;
41         }
42 
43         public override bool update(Admin admin)
44         {
45             throw new NotImplementedException();
46         }
47 
48         public override Admin getAdminById(Admin admin)
49         {
50             return getAdminById(admin.Id);
51         }
52 
53         public override Admin getAdminById(string id)
54         {
55             String sql = "select * from admin where id=@id";
56             SQLiteParameter[] p = {new SQLiteParameter("@id",id)};
57             SQLiteDataReader dr = SqliteHelper.executeReader(sql, p); ;
58 
59             return new Admin(dr);
60         }
61     }

 1 class AdminMgrFactory
 2     {
 3         public static AdminBaseMgr getAdminMgr() {
 4             switch (SysConfig.DB_TYPE)
 5             {
 6                 case "mysql":
 7                     return AdminMysqlMgr.getAdminMgr();
 8 
 9                 case "sqlite":
10                     return AdminSqliteMgr.getAdminMgr();
11             }
12 
13             return null;
14         }

1    static void Main(string[] args)
2         {
3             AdminMgrFactory.getAdminMgr().delete("root");
4         }