How To Return Record's Autonumber Value Inserted into Access DB (221931)


The information in this article applies to:

  • ActiveX Data Objects (ADO) 1.5
  • ActiveX Data Objects (ADO) 2.0
  • Microsoft Internet Information Server 3.0
  • Microsoft Internet Information Server 4.0
  • Microsoft Internet Information Server 5.0
  • Microsoft Access 2.0
  • Microsoft Access for Windows 95 7.0
  • Microsoft Access 97
This article was previously published under Q221931

SUMMARY

When a new record is added to an ActiveX Data Objects (ADO) Recordset that contains an Autonumber field, immediately reporting the value of the Autonumber field for the inserted record returns a value of 0.

This article describes how to retrieve the automatically generated value of an Autonumber field of a record inserted into an Access database with the ADO AddNew() and Update() methods. The sample uses VBScript in an Active Server Pages (ASP) page.

MORE INFORMATION

The following code assumes that you have the Adventure Works database on your machine and you have an ODBC datasource name (DSN) named AdvWorks pointing to it.

The sample also includes the file Adovbs.inc, which can be found in \Program Files\Common Files\System\Ado.

This code does not prompt the user for any input. It inserts one record into the Customers table of the Adventure Works database and displays the value of the Autonumber field (CustomerID) of the new record.

Following are some key elements to note:
  • The CursorLocation must be adUseClient. Access does not support a server-side cursor.
  • In order to populate the Autonumber field with the automatically generated value, the recordset must be requeried using the Requery method.
  • The Requery method resets the absolutePosition (bookmark) from the newly inserted record, to the first record of the requeried recordset. As a result, the absolutePosition must be saved before calling Requery, and restored to the newly inserted record after Requery has been called.
<%@ Language=VBScript %>
<HTML>
<BODY>

<!--#include file=adovbs.inc -->

<% 
Set objConn = CreateObject("ADODB.Connection")
Set objRS = CreateObject("ADODB.Recordset")

objConn.Open "DSN=advworks;"

'Access does not support a cursor engine so a client cursor must be used
objRS.CursorLocation = adUseClient

objRS.Open "SELECT * FROM Customers", objConn, adOpenStatic, adLockOptimistic

     ' when you invoke the method AddNew it adds a new record to the end of           
     ' your current recordset and places your cursor on that record.
     
objRS.AddNew
	objRS("CompanyName") = "Microsoft"
	objRS("ContactFirstName") = "Bob"
	objRS("ContactLastName") = "Smith"
objRS.Update

     ' when you invoke the method Update, it updates the database with the
     ' values of the new record that we just created.  To retrieve the 
     ' value of the Autonumber field we need to update the ADO recordset that
     ' currently have.

     ' When you do a Requery on your recordset, you lose your cursor.  So
     ' we need to store the location before we do the Requery, then reset
     ' it after the Requery.

'before the requery, the Autonumber field shows as 0
Response.Write "<br>ID before Requery = " & objRS("CustomerID")   

bookmark = objRS.absolutePosition  ' First, store the location of you cursor
objRS.Requery                      ' Next, update your recordset with the data from the database

'after the requery, the absolutePosition is the first record of the recordset
Response.Write "<br>ID before setting absolutePosition = " & objRS("CustomerID")

objRS.absolutePosition = bookmark  ' Finally, change your cursor back

'now we have the Autonumber value
Response.Write "<P>Added ID = " & objRS("CustomerID")

objRS.Close
objConn.Close
set objConn = nothing
set objRS = nothing
%>
</BODY>
</HTML>

REFERENCES

For additional information about using AutoIncrement fields and ADO, please see the following article in the Microsoft Knowledge Base:

195910 INFO: Identity (AutoIncrement) Columns in ADO or RDS

Modification Type:MinorLast Reviewed:7/13/2004
Keywords:kbDatabase kbhowto kbInetDev KB221931
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