PRB: ADO's Field ATTRIBUTE Property and adFldRowID

MORE INFORMATION

The "adFldRowID" Attribute maps to OLEDB's DBCOLUMNFLAGS_ISROWID flag. A row that has this flag "contains a persistent row identifier that cannot be written to and has no meaningful value except to identify the row."

Using the preceding description, no column in SQL Server falls into this category. Thus, even when using a native OLEDB Provider for SQL Server, the "adFldRowID" would not be returned through the field's Attribute property. In the following sample code, if you connect to a different data source, the value of the field attribute may vary. The field Attribute value may be composed of more than one Attribute constant. For example, if the Attribute value of a specific field is 24, then it represents adFldFixed (16) + adFldUnknownUpdatable (8).

Steps to Reproduce Behavior

1. Start Visual Basic.
2. Add a Reference to the "Microsoft ActiveX Data Objects Library."
3. Add a command button to the form and add the following code to the click event:

      Private Sub Command2_Click()
            Dim Cn As New Connection
            Dim rs As New Recordset
            Dim SQL As String
   
            Cn.Open "DRIVER={SQL Server};SERVER=<server_name>;UID=;PWD=;"
            SQL = "select * from pubs..jobs"
            rs.Open SQL, Cn
            MsgBox "Name: " & rs.Fields(0).Name & vbCrLf & "Attribs: " & _
               rs.Fields(0).Attributes
   
            rs.Close
            Cn.Close
         End Sub
   					

4. Notice that the attribute value is 16 which maps to adFldFixed as it appears in the message box.