Ado连接

1.连接基础：
#import "C:\Program Files\Common Files\SYSTEM\ADO\msado15.dll" no_namespace rename("EOF", "EndOfFile")
::CoInitialize(NULL);
::CoUninitialize();
	例子如下：
	::CoInitialize(NULL);
    	_ConnectionPtr m_pConnection ; 
	HRESULT hr;
	m_pConnection.CreateInstance(__uuidof(Connection)) ;

	try
	{
		m_pConnection->Open("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=dianbao.mdb","","",adModeUnknown);
	}
	catch(_com_error e )
	{
		MessageBox(NULL,"数据库连接失败，请确认路径是否正确！", "Error",MB_OK);
		return FALSE ;
	}
	::CoUninitialize();	
	return TRUE;