由於各種字段屬性不同，判斷字段是否為空的方法也各異．
下麵是一個通用函數，免去了還要看字段類型之苦．
以下是代碼片段：
'Check a variable isn't "empty"
Function IsBlank(ByRef TempVar)
'by default, assume it's not blank
IsBlank = False
'now check by variable type
Select Case VarType(TempVar)
'Empty & Null
Case 0, 1
IsBlank = True
'String
Case 8
If Len(TempVar) = 0 Then
IsBlank = True
End If
'Object
Case 9
tmpType = TypeName(TempVar)
If (tmpType = "Nothing") Or (tmpType = "Empty") Then
IsBlank = True
End If
'Array
Case 8192, 8204, 8209
'does it have at least one element?
If UBound(TempVar) = -1 Then
IsBlank = True
End If
End Select
End Function
應用實例：
If IsBlank(rs("upic")) Then
upicurl="/images/nonepic.jpg"
Else
upicurl=rs("upic")
End If
