void FirstWindow::on_pushButton_clicked()
{
    FirstWindow conn;

    QString rowid,Activity,thehours;
    Activity=ui->lineEdit->text();
    rowid=3;
    thehours=1;

    conn.connOpen();
    QSqlQuery qry;
    qry.prepare("insert into datatable (row,activity,hours) values('"+rowid+"','"+Activity+"','"+thehours+"')");

    //if this is good
    if(qry.exec())
    {
        this->hide();//hiding current ui
        mainwindow = new MainWindow(this);
        mainwindow->show();


        conn.connClose(); //close after inserting another
    }