Adovcbtd.exe #import Using UpdateBatch and CancelBatch (181733)

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The sample undefines EOF in Stdafx.h to prevent a conflict. The following three lines are from the Stdafx.h file:

   #undef EOF
   #import <Msado15.dll> rename_namespace("ado15")
   //  Please see the #import Directive help in InfoViewer
   rename_namespace("ado15")
				

Msado15.dll has to be located on the same drive as the Windows System directory, and in a path \program files\common files\system\ado. You can configure Visual C++ to use this path to search for the ADO .dll, eliminating the need to specify the explicit path within your #import statement, just as you would configure the location of header files used by

#include. The sample renames the namespace to prevent collisions with other
				

COM libraries.

The sample shows what ADO capabilities are supported by the driver and also uses a Microsoft Access database. However, you can replace it with other data sources in the code.

With certain combinations of Delete/Add New/Next/Prev, it is possible to get an OLE error. The code is provided as a sample only and is not for production purposes.

NOTE: You cannot pass a connection object in the recordset Open methodin ADO version 1.5. You must use the PutRefActiveConnection method. Thisdiffers from ADO 1.0 and Visual Basic (VB). The following code shows how to open a recordset using an ODBC Data Source Name (DSN). The sample file opens the recordset using an alternate (DSN-less) method. Note that error checking has been omitted for clarity in the code given below, but is included in the sample file.

Here is the code:

   void CAdxDlg::OnBUTopen()
   {
      _ConnectionPtr  Conn1;
      HRESULT hr=Conn1.CreateInstance( __uuidof( Connection ) );
      _bstr_t bsDSN   = (L"Student Registration");
      _bstr_t bsEmpty = L"";
      Conn1->ConnectionString = bsDSN;
      Conn1->Open( bsEmpty, bsEmpty, bsEmpty, -1 );
      hr=Rs1.CreateInstance( __uuidof( Recordset ) );
      Rs1->PutRefActiveConnection( Conn1 );
      _bstr_t bsSel(L"SELECT * FROM Student");
      Rs1->Open(bsSel,vtMissing,adOpenKeyset,adLockBatchOptimistic,-1);
   }
				

For additional information about running the sample file, please refer to the Readme.txt file included with the sample.