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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();
 }