'GetinterfacePtr' : is not a member of 'ADODB::_Connection，C++连接SQLServer时出现错误

int _tmain(int argc, _TCHAR* argv[])
{
::CoInitialize(NULL);
_RecordsetPtr m_pRecordset("ADODB.Recordset");
_ConnectionPtr m_pConnection( "ADODB.Connection");
_bstr_t bstrSQL("select * from stu_info"); char* query_cmd = "DELETE FROM stu_info WHERE sname = 'lin'";
try
{
m_pConnection.CreateInstance( "ADODB.Connection");  _bstr_t strConnect= "Provider=SQLOLEDB;Server=(local);Database=student; uid=sa; pwd=123;"; m_pConnection->Open(strConnect,"","",adModeUnknown); if(m_pConnection==NULL)
{ } m_pRecordset.CreateInstance(__uuidof(Recordset)); m_pRecordset->Open(bstrSQL,m_pConnection->GetinterfacePtr(),adOpenDynamic,adLockOptimistic,adCmdText);//m_pConnection->GetinterfacePtr()
}
catch (CMemoryException* e)
{

}
catch (CFileException* e)
{
}
catch (CException* e)
{
}
return 0;
}
错误 1 error C2039: 'GetinterfacePtr' : is not a member of 'ADODB::_Connection' c:\users\adam\documents\visual studio 2005\projects\sqlserverdatabase\sqlserverdatabase\sqlserverdatabase.cpp 32