[MFC] some problems in connecting to MS SQL 2014 with OLE DB

Hi, I'm a student.

During homework, There is a problem.

Connect to MS SQL SERVER 2014 is OK. And Add class for Stored Procedure in SQL SERVER.

Here is the code.

[DB class]

class CRegister_StudentAccessor
{
public:

 LONG m_RETURN_VALUE;
 LONG m_SID;
 LONG m_PASSWORD;
 TCHAR m_GENDER[21];
 TCHAR m_MAJOR[21];
 LONG m_Curri_Year;
 TCHAR m_Phone_Number[21];
 TCHAR m_SNAME[21];
 TCHAR m_ADDRESS[21];

....

 
};
template <class T>
class CRegister_Student : public CCommand<CAccessor<CRegister_StudentAccessor>, CNoRowset >
{
public:
 HRESULT OpenAll()
 {
  HRESULT hr;
  hr = OpenDataSource();
  if (FAILED(hr))
   return hr;
  __if_exists(GetRowsetProperties)
  {
   CDBPropSet propset(DBPROPSET_ROWSET);
   __if_exists(HasBookmark)
   {
    if( HasBookmark() )
     propset.AddProperty(DBPROP_IRowsetLocate, true);
   }
   GetRowsetProperties(&propset);
   return OpenRowset(&propset);
  }
  __if_not_exists(GetRowsetProperties)
  {
   __if_exists(HasBookmark)
   {
    if( HasBookmark() )
    {
     CDBPropSet propset(DBPROPSET_ROWSET);
     propset.AddProperty(DBPROP_IRowsetLocate, true);
     return OpenRowset(&propset);
    }
   }
  }
  return OpenRowset();
 }

 HRESULT OpenRowset(DBPROPSET *pPropSet = NULL)
 {
  HRESULT hr = Open(m_session, NULL, pPropSet);        <-             //  Fail Open
#ifdef _DEBUG
  if(FAILED(hr))
   AtlTraceErrorRecords(hr);            
#endif
  return hr;
 }

 void CloseAll()
 {
  Close();
  ReleaseCommand();
  CloseDataSource();
 }
};

[Call OpenAll() function in button event function]

CRegister_Student<CRegister_StudentAccessor> info;
 if (info.OpenAll() == S_OK)
 { 
  AfxMessageBox("Success");

 }
 else
  AfxMessageBox("Fail");

Result: Fail!!

But, If I don't use Stored Procedure, use just table, that code operate normally.

I set the break points at some places and I can get the place where result fail.

I have few knowledge about that.

So, I want to solve this problem by myself rather than getting direct answer.

Give me some directions of direct answer, please :(