How do I test if a recordSet is empty? isNull?

问题:

How can you test if a record set is empty?

        Dim temp_rst1 As Recordset
        Dim temp_rst2 As Recordset

        Set temp_rst1 = db.OpenRecordset("SELECT * FROM ORDER_DATA WHERE SKUS_ORDERED = '" & curSKU1 & "' AND [ORDER] = " & curOrder)
        Set temp_rst2 = db.OpenRecordset("SELECT * FROM ORDER_DATA WHERE SKUS_ORDERED = '" & curSKU2 & "' AND [ORDER] = " & curOrder)

        If IsNull(temp_rst1) Or IsNull(temp_rst2) Then MsgBox "null"

I'm opening up a couple of record sets based on a select statement. If there are no records, will IsNull return true?

回答1:

I would check the "End of File" flag:

If temp_rst1.EOF Or temp_rst2.EOF Then MsgBox "null"

回答2:

RecordCount is what you want to use.

If Not temp_rst1.RecordCount > 0 ...

回答3:

If temp_rst1.BOF and temp_rst1.EOF then the recordset is empty. This will always be true for an empty recordset, linked or local.

回答4:

A simple way is to write it:

Dim rs As Object
Set rs = Me.Recordset.Clone
If Me.Recordset.RecordCount = 0 then 'checks for number of records
   msgbox "There is no records" 
End if

回答5:

If Not temp_rst1 Is Nothing Then ...