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

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# editablesqlmodel.cpp Example File

sql/querymodel/editablesqlmodel.cpp

     /****************************************************************************
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     ** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
     ** Contact: http://www.qt-project.org/legal
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     ** 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
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     **     of its contributors may be used to endorse or promote products derived
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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();
     }