Работа с БД: с чего начать

#import "c:/Program Files/Common Files/System/ADO/msado15.dll" rename("EOF","EoF")

#import "c:/Program Files/Common Files/System/ADO/msado15.dll" no_namespace ("EOF","EoF")
#import "c:/Program Files/Common Files/System/ADO/msado15.dll" rename("EOF","EoF")

//#import "c:/Program Files/Common Files/System/ADO/msado15.dll" no_namespace ("EOF","EoF")
#import "c:/Program Files/Common Files/System/ADO/msado15.dll" rename("EOF","EoF")

#include <iostream>
#import "c:/Program Files/Common Files/System/ADO/msado15.dll" rename("EOF","EoF")
 
ADODB::_ConnectionPtr pConnection = NULL;
ADODB::_CommandPtr pCommand = NULL;
ADODB::_RecordsetPtr pRSet = NULL;
#ifdef _UNICODE
int wmain(void)
#else
int main(void)
#endif
{
    try {
        pConnection->Open(_bstr_t(L"Provider=Microsoft.ACE.OLEDB.12.0; Data Source=d:\\Parik.mdb;"), _bstr_t(""), _bstr_t(""), 0);
        
 
        pCommand->ActiveConnection = pConnection;
        pCommand->CommandText = "Select Firm From Enterprise";
 
        pRSet->Open(pCommand->CommandText, &pConnection, adOpenStatic, adLockOptimistic, adCmdUnknown);
        //pRSet->Open(pCommand, vtMissing, adOpenStatic, adLockOptimistic, adCmdUnknown);
        //pRSet->Open(pCommand->CommandText, &pConnection, _bstr_t(""), _bstr_t(""), 0);
        //pRSet->Open(pCommand->CommandText, &pConnection, "adOpenStatic", "adLockOptimistic", 0);
        //pRSet->Open(pCommand->CommandText, &pConnection,3,3, 0);
        cout << "Список предприятий: " << pRSet->Index << endl;
        return 0;
    }
    catch (_com_error & e)
    {
        cout << "Где-то ошибка!" << endl;
        _bstr_t bstrSource(e.Source());
        _bstr_t bstrDescription(e.Description());
    }
 
    return 0;
}

pRSet->Open(pCommand->CommandText, &pConnection, ADODB::CursorTypeEnum(3), ADODB::LockTypeEnum(3), 0);

#include "DBConn.h"
#include <iostream>
using namespace std;
#import "c:/Program Files/Common Files/System/ADO/msado15.dll" rename("EOF","EoF")
 
ADODB::_ConnectionPtr pConnection = NULL;
ADODB::_CommandPtr pCommand = NULL;
ADODB::_RecordsetPtr pRSet = NULL;
 
#ifdef _UNICODE
int wmain(void)
#else
int main(void)
#endif
{
    // устанвливаем русскую локаль для консоли
    setlocale(LC_ALL, "Russian");
 
    ::CoInitialize(NULL);
            try {
                HRESULT hr = pConnection.CreateInstance((__uuidof(ADODB::Connection)));
                hr = pConnection->Open(("Provider=Microsoft.ACE.OLEDB.12.0; Data Source=d:\\Parik.mdb;"), _bstr_t(""), _bstr_t(""), 0);
        
        
    catch (_com_error &e)
    {
        //Получаем ошибку из _com_error
        cout << "Где-то ошибка!" << "\n";
        
    }
 
    return 0;
}

inline HRESULT Connection15::Open ( _bstr_t ConnectionString, _bstr_t UserID, _bstr_t Password, long Options ) {
    HRESULT _hr = raw_Open(ConnectionString, UserID, Password, Options);
    if (FAILED(_hr)) _com_issue_errorex(_hr, this, __uuidof(this));
    return _hr;
}

cout << "Где-то ошибка!" << e.Description() << "\n";