Problems Qt Widgets applications and MySql

[Emit]

This is just a part of the program. I don't understand why doesn't it throws the error

'mojabaza' was not declared in this scope

'mojabaza' was not declared in this scope

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MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
    mojabaza=QSqlDatabase::addDatabase("QSQLITE");
    mojabaza.setDatabaseName(pot);
    QFileInfo preveri (pot);
    if (preveri.isFile())
    {if (mojabaza.open()) ui->status->setText("[+]Povezava z bazo je uspela!");
    }
    else
    ui->status->setText("[!]Povezava z bazo NI uspela!");
    this->model1=new QSqlQueryModel();
 
}
 
MainWindow::~MainWindow()
{
    delete ui;
    mojabaza.close();     ///?? should throw the error here
}

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    mojabaza=QSqlDatabase::addDatabase("QSQLITE");
    mojabaza.setDatabaseName(pot);
    QFileInfo preveri (pot);
    if (preveri.isFile())
    {if (mojabaza.open()) ui->status->setText("[+]Povezava z bazo je uspela!");
    }
    else
    ui->status->setText("[!]Povezava z bazo NI uspela!");
    this->model1=new QSqlQueryModel();

}

MainWindow::~MainWindow()
{
    delete ui;
    mojabaza.close();     ///?? should throw the error here
}

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[anda_skoa]

Why do you expect this to trigger an error in the destructor when the constructor does not?
It is either a class member, so accessible from all methods of the class, or it is not, in which case it is undeclared everywhere.

Cheers,
_