you mean like following?

Qt Code: 
  1. class SqlQueryModel: public QSqlQueryModel
  2. {
  3.     Q_OBJECT
  4.     QHash<int,QByteArray> hash;
  5. public:
  6.     explicit SqlQueryModel() : QSqlQueryModel()
  7.     {
  8.         //hash = new QHash<int,QByteArray>;
  9.         hash.insert(Qt::UserRole, QByteArray("name"));
  10.         hash.insert(Qt::UserRole + 1, QByteArray("title"));
  11.     }
  12.     QVariant data(const QModelIndex &index, int role) const
  13.     {
  14.         if(role < Qt::UserRole) {
  15.             return QSqlQueryModel::data(index, role);
  16.         }
  17.         QSqlRecord r = record(index.row());
  18.         return r.value(QString(hash.value(role))).toString();
  19.     }
  20.     inline QHash<int, QByteArray> roleNames() const { return hash; }
  21. };
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