Database Programming ATL

How to use ATL OLE/DB code with an ADO connection

.

Environment: VC++ 6, Windows 2000

This article is for Visual C++ -- OLE/DB programmers that are using ATL but must interact with components or code (from VB or even Visual C++) using ADO. Some time ago was really a problem for me to use such components without changing my code that was using ATL OLE/DB style for accessing a database.

The key code is where the ADO.s Connection is used to get a CSession:

.  .  .

GUID
IID_ACC={0x00000516,0x0000,0x0010,0x80,0x00,
         0x00,0xAA,0x00,0x6D,0x2E,0xA4};
   HRESULT hr;

   try
   {

      if(!m_pADOconnection->CreateDispatch(
         _T("ADODB.Connection"), e))
             throw e;

      CString strConnection;
      strConnection.Format("Provider=Microsoft.Jet.OLEDB.4.0;
                           DataSource=db.mdb;");

      m_pADOconnection->Open(strConnection,"admin","", 0);

      propd=m_pADOconnection->m_lpDispatch;
      hr=propd->QueryInterface(IID_ACC,(void**)&pUnk);
      if(FAILED(hr)) return hr;
      hr=((ADOConnectionConstruction15*)pUnk)->
                      get_Session(&pSession);
      if(FAILED(hr)) return hr;

      hr=pSession->QueryInterface( IID_IOpenRowset,
                                   (void**)&pOpenRowset);
      if(FAILED(hr)) return hr;
      m_pSession->m_spOpenRowset.Attach(
                           (IOpenRowset*)pOpenRowset);
   }
   catch(...)

   . . .

Downloads

Download source - 35 Kb


Comments

  • How to query.

    Posted by Legacy on 04/10/2003 12:00am

    Originally posted by: csjung

    How can i insert data and query using this code?
    eg) Inset Into mlist VALUES(~~~)
    : to insert data.
    Select * from mlist where FirstName = 'name1'
    : to query record.

    Thanks in advance.
    Jung.

    Reply
  • how to use SQL Server for this example?

    Posted by Legacy on 12/21/2001 12:00am

    Originally posted by: James


    Thanks, I have a SQL Server DB in another computer,
    its Data Source name is: DBTest

    how can I connect to it with your sample?

    James

    Reply
Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Live Event Date: May 6, 2014 @ 1:00 p.m. ET / 10:00 a.m. PT While you likely have very good reasons for remaining on WinXP after end of support -- an estimated 20-30% of worldwide devices still are -- the bottom line is your security risk is now significant. In the absence of security patches, attackers will certainly turn their attention to this new opportunity. Join Lumension Vice President Paul Zimski in this one-hour webcast to discuss risk and, more importantly, 5 pragmatic risk mitigation techniques …

  • With JRebel, developers get to see their code changes immediately, fine-tune their code with incremental changes, debug, explore and deploy their code with ease (both locally and remotely), and ultimately spend more time coding instead of waiting for the dreaded application redeploy to finish. Every time a developer tests a code change it takes minutes to build and deploy the application. JRebel keeps the app server running at all times, so testing is instantaneous and interactive.

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds