C ++ uses ADO to connect to sqlserver

#include <string>//c:\Program Files\Common Files\System\ADO\msado15.dll#import "msado15.dll" no_namespace rename("EOF", "EndOfFile") using namespace std;int _tmain(int argc, _TCHAR* argv[]){    ::CoInitialize(NULL);     _ConnectionPtr m_pConnection=NULL;    _RecordsetPtr m_pRecordset=NULL;    m_pConnection.CreateInstance(__uuidof(Connection));    m_pRecordset.CreateInstance(__uuidof(Recordset));        _bstr_t strConnect = "Provider=SQLOLEDB.1;Password=123456;Persist Security Info=True;\                         User ID=sa;Initial Catalog=testdb;Data Source=192.168.1.3";        _bstr_t bstrSQL("select * from testTable");    try    {        m_pConnection->Open(strConnect, "","", adModeUnknown);        m_pRecordset->Open(bstrSQL, m_pConnection.GetInterfacePtr(), adOpenDynamic, adLockOptimistic, adCmdText);        _variant_t vstr, vuint;        while (!m_pRecordset->EndOfFile)        {            vstr = m_pRecordset->GetCollect("str");            vuint = m_pRecordset->GetCollect("uint");                        string str = (_bstr_t)vstr.bstrVal;            unsigned int uint = vuint.ulVal;            m_pRecordset->MoveNext();        }        m_pRecordset->Close();    }    catch (_com_error e)    {        return 0;    }    if(m_pConnection->State)    {        m_pConnection->Close();    }    ::CoUninitialize();    return 0;}