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# editablesqlmodel.cpp Example File
sql/querymodel/editablesqlmodel.cpp

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     #include <QtSql>

     #include "editablesqlmodel.h"

     EditableSqlModel::EditableSqlModel(QObject *parent)
         : QSqlQueryModel(parent)
     {
     }

     Qt::ItemFlags EditableSqlModel::flags(
             const QModelIndex &index) const
     {
         Qt::ItemFlags flags = QSqlQueryModel::flags(index);
         if (index.column() == 1 || index.column() == 2)
             flags |= Qt::ItemIsEditable;
         return flags;
     }

     bool EditableSqlModel::setData(const QModelIndex &index, const QVariant &value, int /* role */)
     {
         if (index.column() < 1 || index.column() > 2)
             return false;

         QModelIndex primaryKeyIndex = QSqlQueryModel::index(index.row(), 0);
         int id = data(primaryKeyIndex).toInt();

         clear();

         bool ok;
         if (index.column() == 1) {
             ok = setFirstName(id, value.toString());
         } else {
             ok = setLastName(id, value.toString());
         }
         refresh();
         return ok;
     }

     void EditableSqlModel::refresh()
     {
         setQuery("select * from person");
         setHeaderData(0, Qt::Horizontal, QObject::tr("ID"));
         setHeaderData(1, Qt::Horizontal, QObject::tr("First name"));
         setHeaderData(2, Qt::Horizontal, QObject::tr("Last name"));
     }

     bool EditableSqlModel::setFirstName(int personId, const QString &firstName)
     {
         QSqlQuery query;
         query.prepare("update person set firstname = ? where id = ?");
         query.addBindValue(firstName);
         query.addBindValue(personId);
         return query.exec();
     }

     bool EditableSqlModel::setLastName(int personId, const QString &lastName)
     {
         QSqlQuery query;
         query.prepare("update person set lastname = ? where id = ?");
         query.addBindValue(lastName);
         query.addBindValue(personId);
         return query.exec();
     }