CODEWITHSUNDEEP
c++qtsqlite
Srv19
Srv19

Reputation: 3618

QTableView view displays nothing

I am working with SQLite from Qt and I can't seem to make code that is derived from one of examples to work properly. My QTableView displays nothing, even though its model is by no means empty:

QSqlTableModel model;

initializeDeliveryModel(&model);

QTableView *view = new QTableView;
view->setModel(&model);

//view->setItemDelegate(new QSqlRelationalDelegate(view));

view->setWindowTitle(QObject::tr("Delivery Table"));
view->show();

Model initialization code:

static void initializeDeliveryModel(QSqlTableModel *model)
{
    model->setTable("DELIVERY");

    int t = model->columnCount(); //6

    model->setEditStrategy(QSqlTableModel::OnManualSubmit);
    model->setHeaderData(0,
                         Qt::Horizontal,
                         QObject::tr("ID"));
    model->setHeaderData(1,
                         Qt::Horizontal,
                         QObject::tr("Number"));
    model->setHeaderData(2,
                         Qt::Horizontal,
                         QObject::tr("Complection"));
    model->setHeaderData(3,
                         Qt::Horizontal,
                         QObject::tr("Has Arrived"));
    model->setHeaderData(4,
                         Qt::Horizontal,
                         QObject::tr("Dealer"));
    model->setHeaderData(5,
                         Qt::Horizontal,
                         QObject::tr("Price"));

    if (!model->select())
    {
        QSqlError err = model->lastError();
        QMessageBox::information(0,
                                 qApp->tr("Failed to select data from table"),
                                 err.text(),
                                 QMessageBox::Ok);
    }

    t = model->rowCount(); // 18 on the last debug
}

What am i missing here? Why would no columns and rows be displayed?

Addendum. The QTableView object is created from inside of button click handler of my main form. When I copied the code from example as it was (and put the code from main into handler), it ended up the same: no headers or rows were displayed.

Upvotes: 4

Views: 4071

Answers (3)

SteveEng
SteveEng

Reputation: 331

My solution to this problem, given that your QTableView widget is created properly, the model data is set, and it shows up as an empty box in your GUI. You need to call:

    emit layoutChanged();

after you set your data to the model. The table should populate after this.

Upvotes: 0

sep
sep

Reputation: 3495

It seems that you did not initialize the model at the same time. If you initialize the model after associating with the view, it is your responsibility to call QAbstractItemView::update(). Passing the default QModelIndex may do the trick.

Upvotes: 1

beduin
beduin

Reputation: 8253

Did you add your QTableView to corresponding form layout?

Upvotes: 2

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