Type在VB6不匹配错误13，ADODB记录循环中

Question

Private Sub cmdShow_Click() 
    'lblTotPur/lblTotPayRet/lblBalance 
    Dim strShow, mSlNo 
    Dim rsShow As New ADODB.Recordset 
    Dim NewItem As Variant 
    If Trim(txtCustomer.Text) = "" Then 
     MsgBox "Please select vendor to proceed...", vbCritical, POPUP_COMP 
     Exit Sub 
    End If 

    Dim recCnt 
    pgrPartyLedger.Min = 0 
    recCnt = 0 
    'VOUCHMST_P//VNO,DATED,VTYPE,REMARKS,byUser CASH PURCHASE RETURN 
    strShow = "select Count(*) as mCnt from VOUCHMST A,VOUCHDAT B, mPurchase C " 
    strShow = strShow & " where A.VNO=B.VNO and (A.REMARKS='CASH PURCHASE RETURN' OR A.REMARKS='CREDIT PURCHASE RETURN' OR A.REMARKS='CREDIT PURCHASE' OR A.REMARKS='CASH PURCHASE' OR A.REMARKS='PAYMENT' OR A.REMARKS='CREDIT NOTE') " 
    strShow = strShow & " and A.DATED between #" & Format(dtFrom.Value, "MM/dd/yyyy") & "# " 
    strShow = strShow & " and #" & Format(dtTo.Value, "MM/dd/yyyy") & "# " 
    strShow = strShow & " and B.IDNO = '" & Trim(txtCustomerId.Text) & "' " 
    strShow = strShow & " and A.VREFNO = C.PurBillNo " 
    'strShow = strShow & " order by A.ID,A.DATED,A.VNO" 
    rsShow.Open strShow, cn 
    recCnt = rsShow("mCnt") 
    rsShow.Close 
    pgrPartyLedger.Max = recCnt + 1 

    'VOUCHMST_P//VNO,DATED,VTYPE,REMARKS,byUser 
    strShow = "select A.Id,A.cmnt,A.VNO,A.DATED,B.IDNO,B.IDNAME,B.AMOUNT,B.DR_CR,B.VNARRATION,A.REMARKS,C.DealInvNo, B.CQ_TYPE, B.BANKNAME, B.BANKBRANCH, B.CQ_NO from VOUCHMST A,VOUCHDAT B,mPurchase C " 
    strShow = strShow & " where A.VNO=B.VNO and (A.REMARKS='CASH PURCHASE RETURN' OR A.REMARKS='CREDIT PURCHASE RETURN' OR A.REMARKS='CREDIT PURCHASE' OR A.REMARKS='CASH PURCHASE' OR A.REMARKS='PAYMENT' OR A.REMARKS='CREDIT NOTE') " 
    strShow = strShow & " and A.DATED between #" & Format(dtFrom.Value, "MM/dd/yyyy") & "# " 
    strShow = strShow & " and #" & Format(dtTo.Value, "MM/dd/yyyy") & "# " 
    strShow = strShow & " and B.IDNO = '" & Trim(txtCustomerId.Text) & "' " 
    strShow = strShow & " and A.VREFNO = C.PurBillNo " 
    strShow = strShow & " order by A.ID,A.DATED,A.VNO" 
    rsShow.Open strShow, cn 

    Dim mPur, mPayRet, mAnyAdv, mTempVNO 
    mPur = 0 
    mPayRet = 0 
    mAnyAdv = 0 

    mSlNo = 1 
    ShowPaymentHeader 
    Do While Not rsShow.EOF 
     mTempVNO = rsShow("VNO") 

     Set NewItem = listViewPayment.ListItems.Add(, "C" & mSlNo, Format(rsShow("DATED"), "dd/MM/yyyy")) 
     NewItem.SubItems(1) = rsShow("VNO") 
     NewItem.SubItems(13) = rsShow("DealInvNo") 

     NewItem.SubItems(2) = IIf(IsNull(rsShow("IDNAME")), "", CommaFilterText(rsShow("IDNAME"), 1)) 
     If Trim(rsShow("REMARKS")) = "CASH PURCHASE" Then 
      NewItem.SubItems(3) = FormatTakaPaisa(rsShow("AMOUNT")) 
      NewItem.SubItems(4) = FormatTakaPaisa(rsShow("AMOUNT")) 
     ElseIf Trim(rsShow("REMARKS")) = "CREDIT PURCHASE" Then 
      mAnyAdv = ShowPartialAdvance(rsShow("VNO")) 
      NewItem.SubItems(3) = FormatTakaPaisa(rsShow("AMOUNT") + Val(mAnyAdv)) 
      If Val(mAnyAdv) > 0 Then 
       NewItem.SubItems(4) = FormatTakaPaisa(mAnyAdv) 
      Else 
       NewItem.SubItems(4) = "" 
      End If 
     Else 
      NewItem.SubItems(3) = "" 
      NewItem.SubItems(4) = FormatTakaPaisa(rsShow("AMOUNT")) 
      NewItem.SubItems(7) = rsShow("CQ_TYPE") 
      NewItem.SubItems(8) = rsShow("BANKNAME") 
      NewItem.SubItems(9) = rsShow("BANKBRANCH") 

      **  
      > NewItem.SubItems(9) = rsShow("cmnt") 

      ** 

     End If 
     NewItem.SubItems(6) = rsShow("IDNO") 

     mPur = mPur + Val(NewItem.SubItems(3)) 
     mPayRet = mPayRet + Val(NewItem.SubItems(4)) 

     NewItem.SubItems(5) = rsShow("REMARKS") 
     NewItem.SubItems(12) = GetVoucherRefNo(mTempVNO) 

     pgrPartyLedger.Value = mSlNo 

     mSlNo = mSlNo + 1 
     rsShow.MoveNext 
    Loop 
    rsShow.Close 

    lblTotPur.Caption = FormatTakaPaisa(mPur) 
    lblTotPayRet.Caption = FormatTakaPaisa(mPayRet) 
    lblBalance.Caption = FormatTakaPaisa(mPur - mPayRet) 
    pgrPartyLedger.Value = 0   
End Sub 

我收到类型不匹配运行时错误13该行，请帮我

Answer 1

从数据库设计和查询视，你可能有场具有空值或具有零长度字符串的字段。 你应该总是检查这一点，特别是当你做外部连接，或多个连接，如在你的查询。

如果选中的仅仅只有一个表的内容，你看到的字段都填充，这并不意味着结果集将返回唯一有效的价值观 - 但这超出了这个答案的范围。

有多种常见的做法，记录处理时检查字段值，并捕获错误。仅举几例：

1. On Error Resume ...块：避免这种情况，你有什么不的发生

2. 检查Null值，DBNull值，Empty值或检查Field Type的 的概述。只要一 例如：

   If IsNull(rsShow("cmnt").value) = True Then NewItem.SubItems(9) = "" Else NewItem.SubItems(9) = rsShow("cmnt") End If

   注意：应明确该领域的value财产。

   如果你字段类型检查，学会使用集成在VB IDE对象浏览器，这将你最好的朋友。

3. 检查现场的ActualSize性质：见MSDN：The Field Object

4. 另一种常见的快捷方式是前面或后面附加与零长度字段的返回值的字符串，这是只有在你有效没有Null值和Blank值，你只只需要显示在标签或列表中的结果进行区分，因为你的情况是： NewItem.SubItems(9) = "" & rsShow("cmnt")

关于Error 13：在VB IDE中，打开Immediate Window，输入：? 0 = ""，然后按Enter键。结果是什么？

最后但并非最不重要的一点，总是仔细检查字段的名称，每个数据库开发人员都面临着由于拼写错误而导致的错误，特别是在处理具有数十个表格和数百个字段的财务应用程序时。