In Queries ist es jedoch etwas schwierig diese Optionen abzufragen. Folgende VBA-Funktion schafft da Abhilfe:

Function InMultiSelect(frms, ctrl As String, col As Integer, data As Variant, ParamArray OtherArgs()) As Boolean
'Checks whether a Variant (data or OtherArgs) is included in the specified column (col) of a ListBox (ctrl)
'in a certain Form (frms)
On Error GoTo Error_InMultiSelect
Dim varItm As Variant
Dim index As Integer
Dim ctl As Control
Dim frm As Form
Set frm = Forms(frms)
Set ctl = frm.Controls(ctrl)
InMultiSelect = False
For Each varItm In ctl.ItemsSelected
If InMultiSelect = True Then Exit For
If CStr(data) = CStr(ctl.Column(col, varItm)) Then InMultiSelect = True
For index = LBound(OtherArgs) To UBound(OtherArgs)
If InMultiSelect = True Then Exit For
If CStr(OtherArgs(index)) = CStr(ctl.Column(col, varItm)) Then InMultiSelect = True
Next index
Next varItm
Exit Function
Error_InMultiSelect:
InMultiSelect = False
Exit Function
End Function


In den Abfragen (Queries) selbst wird diese Funktion dann beispielsweise so aufgerufen:


SELECT *
FROM [tblTabelle]
WHERE InMultiSelect("[frmFormMitMultiSelectAuswahl]","[lstListeMitMultiSelectAuswahl]",0,[tblTabelle].[Spalte]))<>False);


Dies wird gerade wenn man mit temporären Tabellen arbeitet zum Problem.

Eine Abhilfe liefert folgende VBA-Funktion:

' check if a table exists
Function tableExists(tableName As String) As Boolean
On Error GoTo Error_tableExists
Dim strTableName
' assign tableName to String
strTableName = CurrentDb.TableDefs(tableName)
' if no error occurs then set tableExists to true
tableExists = True
Exit_tableExists:
On Error Resume Next
Exit Function
Error_tableExists:
Select Case Err.Number
Case 3265 'Item not found in this collection
tableExists = False
Resume Exit_tableExists
Case Else
MsgBox "Error " & Err.Number & ": " & Err.Description, vbCritical
Resume Exit_tableExists
End Select
End Function