机房收费——上下机

上下机是机房的最主要的功能，在开始之前要先进行详尽的分析。

 上机：    

1、检查卡号的情况，包括输入是否正确、是否注册、是否正在上机等 

2、查看卡内余额是否还能满足学生上机的要求

3、上机后显示的基本信息和添加数据库中的上机信息
4、更改上机人数

 '#################################################################
 '上机，将上机记录写入到上机记录表里
 '#################################################################
 Private Sub cmdOn_Click()
     Dim strSQL As String, strSQL2 As String, strSQL3 As String
     Dim strMsgText As String, strMsgText2 As String, strMsgText3 As String
     Dim objRst As ADODB.Recordset, objRst2 As ADODB.Recordset, objRst3 As ADODB.Recordset

     '让下机日期和时间，消费时间和金额为空
     txtOutDate.Text = ""
     txtOutTime.Text = ""
     txtPayTime.Text = ""
     txtPayMoney.Text = ""

     If txtCardNo.Text = "" Then
         '判断卡号是否为空
         MsgBox "请输入卡号！", vbOKOnly, "警告!"
         txtCardNo.SetFocus
         Exit Sub
     Else
         If Len(txtCardNo.Text) > 10 Then
             '判断输入卡号是否超过设定的长度，防止出错
             MsgBox "卡号过长，请输入长度<10的卡号", vbOKOnly, "警告!"
             txtCardNo.SetFocus
             Exit Sub
         End If
         '查询数据库里学生基本信息表
         Set objRst = New ADODB.Recordset
         strSQL = "select * from student_Info where cardNo='" & Trim(txtCardNo.Text) & "'"
         Set objRst = ExecuteSQL(strSQL, strMsgText)
         If objRst.BOF And objRst.EOF Then
             '判读该卡号是否存在
             MsgBox "该卡号未注册!", vbOKOnly, "警告!"
             txtCardNo.Text = ""
             txtCardNo.SetFocus
             Exit Sub
         Else
             '判断余额是否充足
             If objRst.Fields(3) < GetLeastMoney() Then
                 MsgBox "余额只有" & objRst.Fields(3) & ",少于最少金额，请先充值！", vbOKOnly, "警告!"
                 Exit Sub
             Else

                 '判断该卡号是否正在上机
                 Set objRst3 = New ADODB.Recordset
                 strSQL3 = "select * from online_Info where cardNo='" & Trim(txtCardNo.Text) & "' and outDate is null"
                 Set objRst3 = ExecuteSQL(strSQL3, strMsgText3)
                 If Not (objRst3.BOF And objRst3.EOF) Then
                     Label1.Caption = "该卡正在上机!"
                     txtCardNo.SetFocus
                     Exit Sub
                 Else

                     '显示该卡号的一些基本信息
                     txtStudentNo.Text = checkField(objRst.Fields(0))
                     txtDepartment.Text = checkField(objRst.Fields(4))
                     txtType.Text = checkField(objRst.Fields(14))
                     txtStudentName.Text = checkField(objRst.Fields(1))
                     txtSex.Text = checkField(objRst.Fields(7))
                     txtOnDate.Text = Date
                     'onTime = Time
                     txtOnTime.Text = Time
                     txtAllCash.Text = checkField(objRst.Fields(3))

                     '将上机前的余额提出来，用于下机时计算余额
                     'curAllCash = checkField(objRst.Fields(3))
                     Label1.Caption = "欢迎光临！"

                     '将该卡上机的信息填入到online_Info表里
                     Set objRst2 = New ADODB.Recordset
                     strSQL2 = "select * from online_Info "
                     Set objRst2 = ExecuteSQL(strSQL2, strMsgText2)
                     'objRst2.MoveLast
                     objRst2.AddNew
                     objRst2.Fields(0) = txtCardNo.Text
                     objRst2.Fields(1) = txtStudentName.Text
                     objRst2.Fields(2) = Date
                     objRst2.Fields(3) = Time
                     objRst2.Fields(4) = Null
                     objRst2.Fields(5) = Null
                     objRst2.Update
                     '查询此时正在上机的人数。（可以直接加1）
                     lblPeopleCount.Caption = GetPeopleCount()
                     PeopleCount = GetPeopleCount()   '保存正在上机的人数
                     objRst2.Close

                     objRst.Close
                 End If
             End If
         End If
     End If



 End Sub

下机：

1、检查输入卡号的情况（输入是否正确、是否注册、是否正在上机）

2、显示下机信息，将下机信息添加到数据库中

3、计算下机时间、下机消耗的金额

4、更新数据库中的相关信息

 下机,计算余额，将余额写入学生信息表里，和上机信息表里
 '#####################################################################
 Private Sub cmdOff_Click()

     Dim strSQL As String, strSQL2 As String, strSQL3 As String
     Dim strMsgText As String, strMsgText2 As String, strMsgText3 As String
     Dim objRst As ADODB.Recordset, objRst2 As ADODB.Recordset, objRst3 As ADODB.Recordset
     Dim intTime As Single
     Dim fixedRate As Single
     Dim AllMoney As Currency
     Dim pay As Currency


     If txtCardNo.Text = "" Then
         '判断卡号是否为空
         MsgBox "请输入卡号！", vbOKOnly, "警告!"
         txtCardNo.SetFocus
         Exit Sub
     Else
         If Len(txtCardNo.Text) > 10 Then
             '判断输入卡号是否超过设定的长度，防止出错
             MsgBox "卡号过长，请输入长度<10的卡号", vbOKOnly, "警告!"
             txtCardNo.SetFocus
             Exit Sub
         End If
     End If
     Set objRst = New ADODB.Recordset
     strSQL = "select * from student_Info where cardNo='" & Trim(txtCardNo.Text) & "'"
     Set objRst = ExecuteSQL(strSQL, strMsgText)
     If objRst.BOF And objRst.EOF Then
         '判读该卡号是否存在
         MsgBox "该卡号未注册!", vbOKOnly, "警告!"
         txtCardNo.Text = ""
         txtCardNo.SetFocus
         Exit Sub

     End If
     objRst.Close
     strSQL = ""
     strMsgText = ""



     Set objRst = New ADODB.Recordset
     strSQL = "select * from online_Info where cardno='" & Trim(txtCardNo.Text) & "' and outDate is null "
     Set objRst = ExecuteSQL(strSQL, strMsgText)
     If objRst.BOF And objRst.EOF Then
         '判断该卡是否正在上机
         Label1.Caption = "该卡没有上机！"
         txtCardNo.SetFocus
         Exit Sub
     Else
         '显示下机的一些信息
         txtOutDate.Text = Date
         outTime = Time
         txtOutTime.Text = outTime

         onTime = CDate(Format(objRst.Fields("onTime"), "hh:mm:ss"))

         txtCardNo.Text = checkField(objRst.Fields("cardNo"))
         txtStudentName.Text = checkField(objRst.Fields("studentName"))
         txtOnDate.Text = checkField(objRst.Fields("onDate"))
         txtOnTime.Text = checkField(objRst.Fields("onTime"))

         Set objRst3 = New ADODB.Recordset
         strSQL3 = "select * from student_Info where cardNo='" & txtCardNo.Text & "'"
         Set objRst3 = ExecuteSQL(strSQL3, strMsgText3)
         txtStudentNo.Text = objRst3.Fields("studentNo")
         txtDepartment.Text = objRst3.Fields("department")
         txtSex.Text = objRst3.Fields("sex")
         txtType.Text = "固定用户"

         '删除该记录，将此时信息填入online_Info表里
         objRst.Delete
         objRst.AddNew
         objRst.Fields(0) = txtCardNo.Text
         objRst.Fields(1) = txtStudentName.Text
         objRst.Fields(2) = txtOnDate.Text
         objRst.Fields("onTime") = txtOnTime.Text
         objRst.Fields(4) = txtOutDate.Text
         objRst.Fields("outTime") = txtOutTime.Text
         objRst.Fields(9) = "正常下机"
         'intTime = Val(txtOutTime.Text - txtOnTime.Text)

         '计算上机的时间
         intTime = (outTime - onTime) * 24 * 2

          Set objRst2 = New ADODB.Recordset
          strSQL2 = "select * from basicDate_Info "
          Set objRst2 = ExecuteSQL(strSQL2, strMsgText2)
          '查询固定用户30分钟的费用
          fixedRate = Val(objRst2.Fields(0))
          If intTime < (GetPreparTime() / 30) Then
              '判断上机时间是否超过了准备时间，没超过则花费为0
              objRst.Fields("pay") = 0
              objRst.Fields("allCash") = GetAllMoney(txtCardNo.Text)
          Else
              If intTime <= (GetLeastTime() / 30) Then
                  '判断上机时间是否超过半个小时，没则当成已经上了30分钟
                  objRst.Fields("pay") = fixedRate
                  AllMoney = GetAllMoney(txtCardNo.Text) - fixedRate
                  objRst.Fields("allCash") = AllMoney     '将余额写入上机记录表里
                  WriteAllMoney txtCardNo.Text, AllMoney  '将余额写入学生基本信息表里
              Else
                  If intTime > Int(intTime) Then
                      intTime = Int(intTime) + 1
                  Else
                      intTime = Int(intTime)
                  End If
                  pay = fixedRate * intTime
                  objRst.Fields("pay") = pay
                  AllMoney = GetAllMoney(txtCardNo.Text) - pay
                  objRst.Fields("allCash") = AllMoney    '将余额写入上机记录表里
                  WriteAllMoney txtCardNo.Text, AllMoney  '将余额写入学生基本信息表里
              End If
          End If

          '显示消费的时间金额，和余额
          txtPayTime.Text = Format(outTime - onTime, "hh-mm-ss")
          txtPayMoney.Text = objRst.Fields(6)
          txtAllCash.Text = GetAllMoney(txtCardNo.Text)     '- objRst.Fields(6)
          Label1.Caption = "欢迎下次再来!"

          objRst.Fields(7) = txtAllCash.Text    '将余额写到online_Info表里

          lblPeopleCount.Caption = GetPeopleCount()  '显示正在上机人数
          PeopleCount = GetPeopleCount()
          objRst.Update

          objRst.Close
          objRst2.Close
          objRst3.Close

     End If


 End Sub

以上就是我对机房上下机的理解，望大神指教哦！