本文主要是介绍上下机窗体 机房收费系统，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！
首先对这个窗体进行下分析，可分为三个部分
1.加载：加载窗体时，显示当前系统时间和上机人数（下图红色内容）
2.上机：通过输入的卡号调去基本信息，显示在窗体上（下图绿色内容）
3下机：显示消费时间，金钱和余额（重点在消费金额的计算）（下图蓝色内容）
3.1.消耗金钱的计算方法：以递增时间为收费时间标准。
基本数据表中有（半小时上机费用，递增时间，准备时间，至少上机时间）
（1）半小时的费用/30 * 递增时间 = 等于一个递增时间段金钱
（2）上机的时间- 准备时间） = 总的时间
（3）总时间/递增时间 得到递增时间段
（4）递增时间段* 递增时间段的金额 等于总的消费金额
实例；半小时的费用为3元 ，递增时间为10分钟， 准备时间为2分钟，至少上机时间为5分钟
上机上机munite <=2 不收钱
总时间munite = 上机时间 - 2
(munite>0 and munite<=5) or munite < =10 收1元 按一个递增时间段收费
munite>10 and minute < = 20 收费 2元 按两个递增时间段
............................
代码如下：
1.先声明全局变量
Option Explicit
Dim Timebegin As Date '开始上机时间
Dim Timeend As Date '上机结束时间
Dim onflag As Integer '上机人数2.加载窗体：
Private Sub Timer1_Timer() '使用Timer控件显示当前时间Nowtime.Caption = Time
End SubPrivate Sub MDIForm_Load() ’从online表中获取当前上机的人数Dim mrc As ADODB.RecordsetDim msgtext As StringDim txtsql As Stringtxtsql = "select * from OnLine_Info "Set mrc = ExecuteSQL(txtsql, msgtext)onflag = mrc.RecordCountShow2.Caption = onflag ’显示当前上机人数
End Sub
Private Sub cmdOn_Click()Dim txtsql As StringDim msgtext As StringDim mrc As ADODB.RecordsetDim mrcc As ADODB.RecordsetDim status As String '卡的使用状态'检查卡号是否能正常使用txtsql = "select * from student_Info where cardno='" & Trim(txtcardNo.Text) & "'"Set mrc = ExecuteSQL(txtsql, msgtext)If mrc.EOF ThenMsgBox "此卡尚未注册！", vbOKOnly + vbExclamation, "警告"txtcardNo.Text = ""txtcardNo.SetFocusmrc.CloseExit SubElsestatus = Trim(mrc.Fields(10))If mrc.EOF = False And "未使用" = status ThenMsgBox "该卡没有注册！", vbOKOnly + vbExclamation, "警告！"txtcardNo.Text = ""txtcardNo.SetFocusmrc.CloseExit SubEnd IfEnd If '检查该卡号是否已经登录txtsql = "select * from OnLine_Info where cardno='" & Trim(txtcardNo.Text) & "'"Set mrcc = ExecuteSQL(txtsql, msgtext)'该卡号正在上机，If mrcc.EOF = False ThenMsgBox "该卡号正在上机！", vbOKOnly + vbInformation, "提示"mrcc.Closemrc.CloseExit SubEnd Ifmrcc.Close'如果卡号能用且没有上机，检查余额If Not mrc.Fields(7) > 2 Then '2为basicdata表中的最少金额MsgBox "余额不足，请充值！", vbOKOnly + vbExclamation, "警告"mrc.CloseExit SubEnd If
'余额充足，窗体显示上机信息txtstudentNo.Text = mrc.Fields(1)txtStudentName.Text = mrc.Fields(2)txtType.Text = "固定用户"txtDepartment.Text = mrc.Fields(4)txtSex.Text = mrc.Fields(3)txtRecash.Text = mrc.Fields(7)txtOndate.Text = Format(Date, "yyyy-mm-dd") '定义时间的格式txtOntime.Text = Format(Time, "hh:mm")Timebegin = Trim(txtOntime.Text)show1.Caption = "欢迎光临！" '显示登录人数onflag = onflag + 1Show2.Caption = onflag'断开数据库连接mrc.Close
'将数据信息存入表onLine中txtsql = "select * from OnLine_Info"Set mrcc = ExecuteSQL(txtsql, msgtext)mrcc.AddNewmrcc.Fields(0) = Trim(txtcardNo.Text)mrcc.Fields(1) = Trim(txtType.Text)mrcc.Fields(2) = Trim(txtstudentNo.Text)mrcc.Fields(3) = Trim(txtStudentName.Text)mrcc.Fields(4) = Trim(txtDepartment.Text)mrcc.Fields(5) = Trim(txtSex.Text)mrcc.Fields(6) = Format(Date, "yyyy-mm-dd")mrcc.Fields(7) = Format(Time, "hh:mm")mrcc.Fields(8) = "LL-PC"mrcc.Updatemrcc.ClosetxtOutdate.Text = ""
txtOuttime.Text = ""
txtExpensetime.Text = ""
txtExpensecash.Text = ""
End Sub
Private Sub cmdOut_Click()
Dim txtsql As String
Dim msgtext As String
Dim mrc As ADODB.Recordset
Dim mrcc As ADODB.Recordset'定义这么多的变量用于消耗金钱的计算过程
Dim Usetime As Single '上机消耗的时间
Dim Usecash As Single '上机所消耗的金钱Dim Unittime As Single '递增时间
Dim Unitcash As Single '递增金钱
Dim UnitNumber As Integer '递增时间段Dim pretime As Integer '准备时间
Dim Leasttime As Integer '至少上机时间Dim Halfcash As Single '半小时的费用。
Dim Totalcash As Single '最后余额'判断卡号是否在上机txtsql = "select * from OnLine_Info where cardno='" & Trim(txtcardNo.Text) & "'"Set mrc = ExecuteSQL(txtsql, msgtext)If mrc.EOF = True Thenshow1.Caption = "该卡号还没上机！"mrc.CloseExit SubElse'卡号在上机，加载基本信息txtType.Text = mrc.Fields(1)txtstudentNo.Text = mrc.Fields(2)txtStudentName.Text = mrc.Fields(3)txtDepartment.Text = mrc.Fields(4)txtSex.Text = mrc.Fields(5)txtOndate.Text = mrc.Fields(6)txtOntime.Text = mrc.Fields(7)Timebegin = Trim(txtOntime.Text)mrc.CloseEnd If'计算上机消耗的时间txtOutdate.Text = Format(Date, "yyyy-mm-dd")txtOuttime.Text = Format(Time, "hh:mm")Timeend = Trim(txtOuttime.Text)Usetime = Abs(DateDiff("n", Timeend, Timebegin)) ’暂不支持过夜功能txtExpensetime.Text = Usetime'连接基本数据表，取得基本信息txtsql = "select * from BasicData_info"Set mrc = ExecuteSQL(txtsql, msgtext)mrc.MoveLastHalfcash = mrc.Fields(0) '固定用户半小时的费用Unittime = mrc.Fields(2) '递增时间Leasttime = mrc.Fields(3) '最少上机时间pretime = mrc.Fields(4) '准备时间mrc.Close'计算消费的金额'第一种情况消费时间小于准备时间，消费金额为0If Usetime = <= pretime ThenUsecash = 0txtExpensecash.Text = UsecashElse'一个递增时间段消费的金钱，以半小时的费用为计算基础Unitcash = Format((Halfcash / 30) * Unittime, "0.0")'第二种情况 消费时间小于最小上机时间 按一个递增时间段收费If Usetime <=Leasttime ThenUsecash = UnitcashtxtExpensecash.Text = UnitcashElse'第三种情况 最后求出的UnitNumber为递增时间段的个数Usetime = Usetime - pretimeUnitNumber = Usetime Mod UnittimeIf UnitNumber = 0 ThenUnitNumber = Int(Usetime / Unittime)ElseUnitNumber = Int(Usetime / Unittime) + 1End IfUsecash = Format(UnitNumber * Unitcash, "0.0")txtExpensecash.Text = UsecashEnd IfEnd If'计算最新余额txtsql = "select * from student_Info where cardno='" & txtcardNo & "'"Set mrc = ExecuteSQL(txtsql, msgtext)'获得原来的余额Totalcash = mrc.Fields(7)'计算消费后的余额Totalcash = Totalcash - Val(Trim(txtExpensecash.Text))'更新余额mrc.Fields(7).Value = Totalcashmrc.Updatemrc.ClosetxtRecash.Text = Totalcash'更新表txtsql = "select * from OnLine_Info where cardno='" & Trim(txtcardNo.Text) & "'"Set mrcc = ExecuteSQL(txtsql, msgtext)txtsql = "select * from Line_Info"Set mrc = ExecuteSQL(txtsql, msgtext)mrc.AddNewmrc.Fields(1) = mrcc.Fields(0)mrc.Fields(2) = mrcc.Fields(2)mrc.Fields(3) = mrcc.Fields(3)mrc.Fields(4) = mrcc.Fields(4)mrc.Fields(5) = mrcc.Fields(5)mrc.Fields(6) = mrcc.Fields(6)mrc.Fields(7) = mrcc.Fields(7)mrc.Fields(8) = Trim(txtOutdate.Text)mrc.Fields(9) = Trim(txtOuttime.Text)mrc.Fields(10) = Trim(txtExpensetime.Text)mrc.Fields(11) = Trim(txtExpensecash.Text)mrc.Fields(12) = Trim(txtRecash.Text)mrc.Fields(13) = "正常下机"mrc.Fields(14) = "LL-PC" '得到计算机的名字mrc.Updatemrc.Closemrcc.Deletemrcc.Updatemrcc.Close'登录用户减1onflag = onflag - 1Show2.Caption = onflag'显示下线show1.Caption = "欢迎下次再来！"End Sub
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