vb.net机房收费系统一个小功能的实现
经过不懈的努力,和不断地完善,今天终于将一个简单的功能利用上次画的包图实现了,让我对三层和设计模式有了一点新的理解
代码:
'/************************************************* '作者:许恕'小组: '说明:上机窗体的编码'创建日期:2013年1月30日'版本号:1.0.0'**********************************************/'上机窗体Public Class FrmOnLine '上机 Private Sub ButOnLine_Click(sender As Object, e As EventArgs) Handles ButOnLine.Click Dim card As New Model.CardModel Dim lineFacade As New Facade.LineFacade card.Card_Id = TxtCardId.Text card.Card_PassWord = TxtPassWord.Text If lineFacade.Online(card) Then MsgBox("登陆成功!") End If End SubEnd Class'/************************************************* '作者:许恕'小组: '说明:实体层卡的的编码'创建日期:2013年1月30日'版本号:1.0.0'**********************************************/Public Class CardModel Private cardId As Integer Private password As String Private level As String Private balance As String '卡号的读取 Public Property Card_Id As Integer Get Return cardId End Get Set(value As Integer) cardId = value End Set End Property '密码的读取 Public Property Card_PassWord As String Get Return password End Get Set(value As String) password = value End Set End Property '级别的读取 Public Property Card_Level As String Get Return level End Get Set(value As String) level = value End Set End Property '余额的读取 Public Property Card_Balance As String Get Return balance End Get Set(value As String) balance = value End Set End PropertyEnd Class'/************************************************* '作者:许恕'小组: '说明:基本数据接口的编码'创建日期:2013年1月30日'版本号:1.0.0'**********************************************/'卡表的服务接口Public Interface ICardSeverDAL '测试卡号密码是否正确 Function Test(card As Model.CardModel) As Boolean '增加卡号 Function Add(card As Model.CardModel) As Boolean '删除卡号 Function Delete(card As Model.CardModel) As Boolean '编辑卡号 Function Edit(card As Model.CardModel) As Boolean '查询卡号 Function CheckInformation(card As Model.CardModel) As Model.CardForStudentModel()End Interface'/************************************************* '作者:许恕'小组: '说明:上下机工厂'创建日期:2013年1月30日'版本号:1.0.0'**********************************************/Imports System.Reflection'关于上下机的工厂Public Class LineFactory '创造卡表的服务类 Public Function CreatCardSeverDAL() As IDAL.ICardSeverDAL Dim ICardDAL As IDAL.ICardSeverDAL Dim asmName As String Dim className As String asmName = "DAL" className = asmName + "." + "SqlseverCardSeverDAL" '利用反射生成需要的类 ICardDAL = CType(Assembly.Load(asmName).CreateInstance(className), IDAL.ICardSeverDAL) Return ICardDAL End FunctionEnd Class'/************************************************* '作者:许恕'小组: '说明:上下机外观'创建日期:2013年1月30日'版本号:1.0.0'**********************************************/'上下机的外观类Public Class LineFacade Dim lineObject As BLL.LineBll Sub New() lineObject = New BLL.LineBll End Sub '上机 Public Function Online(card As Model.CardModel) As Boolean Return lineObject.TestUser(card) End FunctionEnd Class'/************************************************* '作者:许恕'小组: '说明:数据操作层的编码'创建日期:2013年1月30日'版本号:1.0.0'**********************************************/'D层关于上下机的一类'卡表Public Class SqlseverCardSeverDAL : Implements IDAL.ICardSeverDAL Private str_SqlConnection As String '连接数据库 Public Sub New() str_SqlConnection = ConfigurationManager.AppSettings("SqlConnectionString") End Sub '测试卡是否存在 Public Function Test(card As CardModel) As Boolean Implements ICardSeverDAL.Test Dim sqlString As String Dim MyCmd As SqlCommand Dim MyConn As SqlConnection Dim MyReader As SqlDataReader sqlString = "select * from T_Cardinfo where card_id='" & card.Card_Id & "' and password='" & card.Card_PassWord & "'" MyConn = New SqlConnection(str_SqlConnection) MyCmd = New SqlCommand(sqlString, MyConn) Try MyConn.Open() MyReader = MyCmd.ExecuteReader If MyReader.Read() Then MyReader.Close() MyConn.Close() Return True Else Return False End If Catch ex As Exception MsgBox(ex.Message) Return Nothing End TryEnd FunctionEnd class'/************************************************* '作者:许恕'小组: '说明:商务逻辑层的编码'创建日期:2013年1月30日'版本号:1.0.0'**********************************************/'B层的上下机类Public Class LineBll '测试用户是否存在 Public Function TestUser(card As Model.CardModel) As Boolean Dim lineFactory As New Factory.LineFactory Dim icard As IDAL.ICardSeverDAL icard = lineFactory.CreatCardSeverDAL Return icard.Test(card) End FunctionEnd Class