Type在VB6不匹配錯誤13，ADODB記錄循環中

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 

我收到類型不匹配運行時錯誤13該行，請幫我

Answer 1

從數據庫設計和查詢視，你可能有場具有空值或具有零長度字符串的字段。 你應該總是檢查這一點，特別是當你做外部連接，或多個連接，如在你的查詢。

如果選中的僅僅只有一個表的內容，你看到的字段都填充，這並不意味着結果集將返回唯一有效的價值觀 - 但這超出了這個答案的範圍。

有多種常見的做法，記錄處理時檢查字段值，並捕獲錯誤。僅舉幾例：

1. On Error Resume ...塊：避免這種情況，你有什麼不的發生

2. 檢查Null值，DBNull值，Empty值或檢查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：應明確該領域的value財產。

   如果你字段類型檢查，學會使用集成在VB IDE對象瀏覽器，這將你最好的朋友。

3. 檢查現場的ActualSize性質：見MSDN：The Field Object

4. 另一種常見的快捷方式是前面或後面附加與零長度字段的返回值的字符串，這是隻有在你有效沒有Null值和Blank值，你只只需要顯示在標籤或列表中的結果進行區分，因爲你的情況是： NewItem.SubItems(9) = "" & rsShow("cmnt")

關於Error 13：在VB IDE中，打開Immediate Window，輸入：? 0 = ""，然後按Enter鍵。結果是什麼？

最後但並非最不重要的一點，總是仔細檢查字段的名稱，每個數據庫開發人員都面臨着由於拼寫錯誤而導致的錯誤，特別是在處理具有數十個表格和數百個字段的財務應用程序時。