机房收费系统总结——窗体代码框架

一、判断

1.不需要数据库

1）.是否为空字符

2）.是否为数字

3）.是否前后相同

通用格式：

If Not  Testtxt(txtUserID.Text) Then 
       MsgBox "请输入用户名！", vbOKOnly +vbExclamation, "警告"
        txtUserID.SetFocus
        Exit Sub
    End If

Testtxt处可以改写成IsNumeric（是否为数字的判断），或者条件也可以写成 

txtIdentifyPWD.Text  <>txtPWD.Text，大家触类旁通就好。

2.需要数据库

1）.卡号是否相同

2）.卡号是否存在

3）.是否有记录的判断

二、SQL语句增、删、改、查

增：

例1：

txtSQL = "select * from User_Info whereLevel='" & Trim(ComboHead.Text) & "'"
set mrc=ExecuteSQL(txtSQL,MsgText)
mrc.addnew

例2：    

 txtSQL = "insert into checkday_Info values('" & ReMainCash & "','" &ReChargeCash & "','" &  ConsumeCash &   "','"& Cancel Cash & "','" & AllCash & "','" &Mydate & "')"
              Set mrc = ExecuteSQL(txtSQL, MsgText)

删：

例1：     

 txtSQL = "delete from User_Info where UserID='" & Trim(DelUser) & "'"
 Set mrc = ExecuteSQL(DelSQL, MsgText)

改：

例1：

 txtSQL = "select * from User_Info whereLevel='" & Trim(ComboHead.Text) & "'"
 set mrc=ExecuteSQL(txtSQL,MsgText)
 mrc.addnew

例2：   

txtSQL="update student_Info set  cash="& Balance &" where cardno='"& Trim(cardno) &"'"
set mrc=ExecuteSQL(txtSQL,MsgText)

查：

    通过两个DTPicker控件 构成的时间段查询：

     txtSQL= "select * from CancelCard_Info where Date between '" &CStr(DTPicker1.Value) & "' and'" & CStr(DTPicker2.Value)& "'"

   计算一个数据库表中记录数量的查询：  

 txtSQL= "select Count(*) from OnLine_Info"

 

   对一个表中的某一项求和的查询：

 txtSQL= "select sum(addmoney) from Recharge_Info where UserID='" &Trim(cmbOperatorName) & "'and    status='未结账'"

三、显示方式

1.text

text的caption属性

2.flexgrid

系统中多采用循环的方式显示flexgrid表格中的内容。

 

With myflexgrid
        .Font = "微软雅黑"
        .Font.Size = "16"
        .Rows = 1
        .CellAlignment = 4
        .TextMatrix(0, 0) = "卡号"
        .TextMatrix(0, 1) = "充值金额"
        .TextMatrix(0, 2) = "充值日期"
        .TextMatrix(0, 3) = "充值时间"
        .TextMatrix(0, 4) = "充值教师"
        .TextMatrix(0, 5) = "结账状态"
    

    While mrc.EOF = False
          .Rows = .Rows + 1
          .CellAlignment = 4
          .TextMatrix(.Rows - 1, 0) = mrc.Fields(2)
          .TextMatrix(.Rows - 1, 1) = mrc.Fields(3)
           .TextMatrix(.Rows - 1, 2) = mrc.Fields(4)
          .TextMatrix(.Rows - 1, 3) = mrc.Fields(5)
          .TextMatrix(.Rows - 1, 4) = mrc.Fields(6)
          .TextMatrix(.Rows - 1, 5) = mrc.Fields(7)
          mrc.MoveNext
    Wend

3.输出到excel表格

Dim i As Integer
        Dim j As Integer
        '如果有错误就统一处理，提示没有数据导出  
        On Error Resume Next 
        If myflexGrid.TextMatrix(1, 0) = "" Then
                MsgBox "没有数据导出", vbInformation, "提示"
                Exit Sub
        End If
        
        Dim excelApp As Excel.Application
        Set excelApp = New Excel.Application
        Set excelApp = CreateObject("Excel.application"）'创建excel对象
        Dim exbooks As Excel.Workbook
        Dim exsheet As Excel.Worksheet
        Set exbook = excelApp.Workbooks.Add'添加新工作簿
        
        excelApp.SheetsInNewWorkbook = 1
        excelApp.Visible = True
        
        With excelApp.ActiveSheet'创建excel工作簿中的行和列
            For i = 1 To myflexGrid.Rows
                For j = 1 To myflexGrid.Cols
                   .Cells(i, j).Value = "" & Format$(myflexGrid.TextMatrix(i - 1, j - 1))
                Next j
            Next i
            
        End With
        
        Set exsheet = Nothing
        Set exbook = Nothing
        Set excelApp = Nothing     

4.list

 List1.AddItem "充值教师:" & MyUserID

5.打印预览

Report.PrintPreview (True)

6.报表