Qt 4.8: editablesqlmodel.cpp Example File (sql/querymodel/editablesqlmodel.cpp)

Qt Reference Documentation

- Qt 4.8
- ALL VERSIONS

- A
- A
- A
- Print

# editablesqlmodel.cpp Example File

sql/querymodel/editablesqlmodel.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of Digia Plc and its Subsidiary(-ies) nor the names
     **     of its contributors may be used to endorse or promote products derived
     **     from this software without specific prior written permission.
     **
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     **
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     #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();
     }