problem connecing the db

Hi,
i'm trying to connect my ORACLE db, i already compiled the plugin and now i'm trying the following code:

Code:

#include <QCoreApplication>
#include <QtGui>
#include <QtSql>
#include <QDebug>
 
#include "mainwindow.h"
 
int main(int argc, char *argv[])
{
    QCoreApplication myApp(argc, argv);
 
    QSqlDatabase db;
    db.addDatabase("QOCI");
    db.setHostName("in13");
    db.setDatabaseName("RFV75");
    db.setUserName("RFVDB19");
    db.setPassword("RFVDB19");
    db.setPort(1521);
    if (db.open())
        qDebug("open");
 
 
    return myApp.exec();

but not connecting and no error in the output
please help