QT + Sqlite not working

[BrainStorm]

I need to use sqlite databases with Qt, and data submiting is not working.
I've connected a button click to this:

void submit()
    {
    if(!model->database().driver()->hasFeature(QSqlDriver::Transactions))
        qDebug() << "sqlite driver doesn't support transactions";
    if(model->database().transaction())
    {
        if(model->submitAll())
        {
        model->query().finish();
        if(model->database().commit())
        {
            model->query().exec();
            commitBtn->setEnabled(false);
            return;
        }
        }
    }
    model->database().rollback();
    QMessageBox::information(
        this,
        tr("Database error"),
        model->database().lastError().text());
    }

void submit()
    {
    if(!model->database().driver()->hasFeature(QSqlDriver::Transactions))
        qDebug() << "sqlite driver doesn't support transactions";
    if(model->database().transaction())
    {
        if(model->submitAll())
        {
        model->query().finish();
        if(model->database().commit())
        {
            model->query().exec();
            commitBtn->setEnabled(false);
            return;
        }
        }
    }
    model->database().rollback();
    QMessageBox::information(
        this,
        tr("Database error"),
        model->database().lastError().text());
    }

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I've once tried without the query stop stuff but no success, two days since i've started searching around a way but nothing. I hope you guys can help me, thanks in advance, and sorry my bad english.