Applying QSqlTableModel to QTableView

Hi!

I have QSqlTableModel with sample data from Qt SQL Examples "connection.h" file. If I want to get records using model.record() it works. model.rowCount() works perfectly too. But if I want to apply my model to tableView it doesn't work:

Code:

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "F:/Qt/2010.01/qt/examples/sql/connection.h"
#include <QtSql>
#include <QDebug>
#include <QMessageBox>
#include <QSqlTableModel>
 
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
    if (!createConnection())
        QMessageBox::critical(this, tr("Błąd bazy danych"), tr("Nie można połączyć się z bazą danych."));
 
    QSqlTableModel model;
    model.setTable("person");
    model.select();
 
    ui->tableView->setModel(&model);
 
    ui->label->setText(model.record(1).value("firstname").toString());
    qDebug() << model.rowCount();
}
 
MainWindow::~MainWindow()
{
    delete ui;
}
 
void MainWindow::changeEvent(QEvent *e)
{
    QMainWindow::changeEvent(e);
    switch (e->type()) {
    case QEvent::LanguageChange:
        ui->retranslateUi(this);
        break;
    default:
        break;
    }
}

I post my final result in attachment.

Ps. What are the differences between "QSqlTableModel model;" and "QSqlTableModel *model = new QSqlTableModel;"?