vba - Determine if Attachment field is empty

Question

How can you determine if in Attachment field in Access does not contain an attachment using VBA? I tried

If IsNull(rstMassBalance.Fields("FileName"))

and

If rstMassBalance.Fields("FileName") = Null

but neither of these work. It either does nothing or gives me run-time error 3021 that says "No current record"

Answer 1

我不使用该Attachments字段，但附件是Recordset2从Value附件字段的属性中检索到的。

Dim rsChild As DAO.Recordset2

Set rsChild = rstMassBalance.Fields("FileName").Value

Nothing如果没有附件，我不确定这是否会返回或一个空记录集。所以要么：

If rsChild Is Nothing Then
'or 
If rsChild.RecordCount  <= 0 Then   'probably this one

可以从这个Access 博客中获得很多信息。

在 DAO 中使用附件建议您可以检查：

If rsChild.EOF Then