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  • Your email address will not be published.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

  • Application and data integration doesn't have to be slow and expensive. Learn how cloud-based integration platforms dramatically speed results and lower costs in this white paper by Bloor Research.

  • Live Event Date: September 17, 2014 @ 1:00 p.m. ET / 10:00 a.m. PT Another day, another end-of-support deadline. You've heard enough about the hazards of not migrating to Windows Server 2008 or 2012. What you may not know is that there's plenty in it for you and your business, like increased automation and performance, time-saving technical features, and a lower total cost of ownership. Check out this upcoming eSeminar and join Rich Holmes, Pomeroy's practice director of virtualization, as he discusses the …

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds