這是按照孫鑫C++視訊第二十講編寫的，但是還沒有在VS2012中找到如何得到ConnectionString的方法，待解決，多樣資料庫的連線

void CAdoDlg::OnBnClickedButton1()
{
	// TODO: 在此新增控制元件通知處理程式程式碼
	CoInitialize(NULL) ;//初始Com庫

	_ConnectionPtr pConn(__uuidof(Connection)) ;//__uuidof()獲取Connection全域性唯一標示符
	_RecordsetPtr  pRst(__uuidof(Recordset)) ;
	_CommandPtr    pCmd(__uuidof(Command)) ;

	pConn->ConnectionString = "Provider=SQLOLEDB.1;Persist Security Info=False;Initial Catalog=pubs" ;//在此新增連結字串的語句
	pConn->Open("" , "" , "" , adConnectUnspecified) ;//查閱MSDN瞭解相關引數

	pRst = pConn->Execute("select * from authors" , NULL , adCmdText) ;
	pRst->Open("select * from authors" , _variant_t((IDispatch *)pConn) ,
		adOpenDynamic , adLockOptimistic , adCmdText) ;
	pCmd->put_ActiveConnection(_variant_t((IDispatch *)pConn)) ;
	pCmd->CommandText = "select * from authors" ;
	while (!pRst->rsEOF)
	{
		((CListBox *)GetDlgItem(IDC_LIST1))->AddString(
			(_bstr_t)pRst->GetCollect("au_lname")) ;
		pRst->MoveNext() ;
	}

	pRst->Close() ;
	pConn->Close() ;
	pCmd->Release() ;
	pCmd->Release() ;
	pRst->Release() ;
	pConn->Release() ;

	CoUninitialize() ;
}