My QSqlQueryModel does not display data in a list

Question

I played with QSqlQueryModel, but now I'm completely stuck. I searched for a solution all day, but so far no luck.

What I got is that it retrieves data from my sqlite database, but for some reason I cannot show this in my list. It seems that my role names do not exist.
I get messages like .... ReferenceError: id is not defined ..... for every row I pull from the database.

I used an example: http://qt-project.org/wiki/How_to_use_a_QSqlQueryModel_in_QML

I tried both examples, but always get the same problem.
My ccp file looks like this:

#include "artistssqlmodel.h"

const char* ArtistsSqlModel::COLUMN_NAMES[] = {
    "id",
    "word",
    NULL
};

const char* ArtistsSqlModel::SQL_SELECT = "SELECT id, word FROM dictionary LIMIT 5";

ArtistsSqlModel::ArtistsSqlModel(QObject *parent) :
    QSqlQueryModel(parent)
{
    mydb=QSqlDatabase::addDatabase("QSQLITE");
    QString dbPath = "E://mydb.db";
    mydb.setDatabaseName(dbPath);
    connectToDb();

    int idx = 0;
    QHash<int, QByteArray> roleNames;
    while( COLUMN_NAMES[idx]) {
        roleNames[Qt::UserRole + idx + 1] = COLUMN_NAMES[idx];
        idx++;
    }
    //roleNames(roleNames);
    refresh();
}

void ArtistsSqlModel::connectToDb()
{
    //QString bla = "Default";

    if(!mydb.open())
    {
        qDebug() << "Database didnt open";
    }
    else
    {
        qDebug() << "Your database is open";
    }
}

void ArtistsSqlModel::refresh()
{
    this->setQuery(SQL_SELECT);
}

QVariant ArtistsSqlModel::data(const QModelIndex &index, int role) const
{
    QVariant value = QSqlQueryModel::data(index, role);
    if(role < Qt::UserRole)
    {
        value = QSqlQueryModel::data(index, role);
    }
    else
    {
        int columnIdx = role - Qt::UserRole - 1;
        QModelIndex modelIndex = this->index(index.row(), columnIdx);
        value = QSqlQueryModel::data(modelIndex, Qt::DisplayRole);
    }
    return value;
}

and my qml file is as follows

import QtQuick 2.2
import QtQuick.Window 2.1

Window {
    visible: true
    width: 800
    height: 800

    ListView{
        anchors.fill:parent
        model:artistsModel
        delegate: Item{
            width:parent.width
            height: width/10
            Text {
                id: name
                text: word
                verticalAlignment: Text.AlignVCenter
                horizontalAlignment: Text.AlignHCenter
                anchors.fill:parent
            }
        }
    }
}

, , , - , . qt ++, .
, sqlite db .

EDIT: , ( , ) artistsqlmodel.h

#ifndef ARTISTSSQLMODEL_H
#define ARTISTSSQLMODEL_H

#include <QObject>
#include <QSqlQueryModel>
#include <QDebug>

class ArtistsSqlModel : public QSqlQueryModel
{
    Q_OBJECT
public:
    explicit ArtistsSqlModel(QObject *parent);
    void refresh();
    QVariant data(const QModelIndex &index, int role) const;
    void connectToDb();
signals:
public slots:
private:
    const static char* COLUMN_NAMES[];
    const static char* SQL_SELECT;
    QSqlDatabase mydb;
};


#endif // ARTISTSSQLMODEL_H

main.cpp

#include <QGuiApplication>
#include <QQmlApplicationEngine>
#include <QtQml>
#include "artistssqlmodel.h"

int main(int argc, char *argv[])
{
    QGuiApplication app(argc, argv);
    QQmlApplicationEngine engine;

    QQmlContext *context = engine.rootContext();
    ArtistsSqlModel *artistsSqlModel = new ArtistsSqlModel( qApp);

    context->setContextProperty("artistsModel", artistsSqlModel);
    engine.load(QUrl(QStringLiteral("qrc:///qml/main.qml")));

    return app.exec();
}

Answer 1

,

. , QML . , , . "" - QAbstractItemModel:: rolenames(). :

QHash<int, QByteArray> ArtistsSqlModel::rolenames() const
{
  int idx = 0;
  QHash<int, QByteArray> roleNames;
  while( COLUMN_NAMES[idx]) {
    roleNames[Qt::UserRole + idx + 1] = COLUMN_NAMES[idx];
    idx++;
  }  
  return roleNames;
}

, Qt, . , , .

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