QTableView, sqlite, wrong data type

I have a problem with QTableView not showing fractional part of a floating point number retrieved from sqlite query (i.e. QSqlQueryModel).

I've tested it with QSqlQuery - q.value(0).toDouble() returns correct floating point value. Yet QTableView shows only integer part.

How can I change QTableView or QSqlQueryModel column type?

edit: Here is sample code. Requires tableView object on MainWindow.

Code:

---

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
 
    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
    db.setDatabaseName(":memory:");
    db.open();
 
    QSqlQuery q;
    q.exec("create table t (col1)");
    q.exec("insert into t (col1) values (161726.36)");
 
    QSqlQueryModel *m = new QSqlQueryModel();
    m->setQuery("select col1 from t");
 
    ui->tableView->setModel(m);
}

---

The default delegate handles the display of the DisplayRole of the model. For doubles:

Code:

---

case QVariant::Double:
        text = locale.toString(value.toReal());
        break;

---

The default formatting for QLocale::toString() with a double argument is 6 significant digits (not digits after the decimal point, see QString::number() argument formats). You want to provide your own delegate subclass that overrides displayText() or customise the model to return a formatted string in the DisplayRole (still return a Double in EditRole).