在VBA DAO 记录集中检查 null 值时,可以使用 IsNull 函数。IsNull 函数用于检查字段是否包含 null 值。以下是一个示例代码: 代码语言:vba 复制 Sub CheckNullValue() Dim db As DAO.Database Dim rs As DAO.Recordset Dim fieldName As String Dim fieldValue As Variant ' 打开数据库和记录集 Set db = ...
对于str未赋值 判定是True另外单元格 str=“” 就是空举例Dim MyVar, MyCheckMyCheck = IsNull(MyVar...
If Cells(Target.Row, Target.Column) <> "" Then Beep Cells(Target.Row, 1).Offset(0, 0).Select 'MsgBox Cells(Target.Row, Target.Column).Address & " cannot be selected and edited as it is a read-only cell", _ 'vbInformation, "Tool" End If End If End Sub6.check是不是文件夹或者...
Public FunctionCOUNTDISTINCTcol(ByRef rngToCheck As Range)As Variant Dim colDistinct As Collection Dim varValues As Variant Dim varValue As Variant Dim lngCount As Long Dim lngRow As Long Dim lngCol As Long On Error GoTo ErrorHandler varValues=rngToCheck.Value '如果rngToCheck多于1个单元格 '...
有些情况下，您可能希望计算结果为 True 的表达式，如 If Var = Null 和 If Var <> Null 始终为 False 。这是因为包含 Null 的任何表达式本⾝为 Null， 因此 为 False。 ⽰例： 此⽰例使⽤ IsNull 函数确定变量是否包含 Null。Dim MyVar, MyCheckMyCheck = IsNull(MyVar) ' Returns False.MyVar...
DataCheck) Dim SelRange As Range Dim Txl As Range Set SelRange = Range(Selection.Address) For Each Txl In SelRange If WorksheetFunction.CountIf(SelRange, Txl) > 1 Then Txl.Font.ColorIndex = 3 End If Next SetSelRange = Nothing End Function'...
End If 方法三,按月分类自动编号: Dim id, date2 As String date2 = "GF" & [部门代码] & Format([入库日期], "YYYYMM") id = DMax("[rk编号]", "[入库单]", "[rk编号] Like '" & date2 & "???'") If IsNull(id) Then
'// Check each window in turnDohLogWindow=FindWindowEx(0&,hLogWindow,vbNullString,vbNullString)'// Check that a window was found If hLogWindow = 0 Then Exit Do '// Get the class name of the windowsData=String$(100,Chr$(0))nLen=GetClassName(hLogWindow,sData,100)Class=Left$(sData...
CheckEntry = Not IsNull(DLookup("IDCloud", "TblCloud", strCriteria)) End Function In ether case to return the result in a message box the function would be called like this: MsgBox CheckEntry("000000001") For an example of the use of the EXISTS predicate you might like to take...
--Run-time error ‘3704’ Operation is not allowed when the object is closed“SET NOCOUNT ON;...