ADO Connection的问题

STDMETHODIMP CTAdo::GetRecordset(_Recordset **ppRecordset)
{
         m_pConnection已经存在的连接
m_pConnection->Open(bstr_t(szOpen),bstr_t(""),bstr_t(""),-1);
hr=CoCreateInstance(CLSID_CADORecordset,NULL,CLSCTX_INPROC_SERVER,IID_IADORecordset15,(LPVOID *)ppRecordset);
// (*ppRecordset)->Open(CComVariant("select * from user"),CComVariant(m_pConnection),adOpenDynamic,adLockOptimistic,adCmdText);
if(FAILED(hr))
{
return hr;
}
return S_OK;
}