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try
{
        ::CoInitialize(NULL);
        hr=m_pConnection.CreateInstance(__uuidof(Connection));
        if   (SUCCEEDED(hr))
            MessageBox( "ok ");
        else
            MessageBox( "bad ");
        m_pConnection-> Open( "Provider=MSDAORA.1;Data   Source=abc; ", "eval ", "eval123 ",adModeUnknown);
}
catch   (_com_error   e)
{
        AfxMessageBox(e.ErrorMessage());
        AfxMessageBox( "Êý¾Ý¿âÁ¬½Ó²»³É¹¦! ");
}
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Ö÷Òª»³ÒÉm_pConnection-> Open( "Provider=MSDAORA.1;Data   Source=abc; ", "eval ", "eval123 ",adModeUnknown);
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listener.ora:
SID_LIST_LISTENER =
  (SID_LIST =
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