C++/Qt/QSqlTableModel — различия между версиями
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Текущая версия на 13:25, 25 мая 2010
QSqlTableModel demo
<source lang="cpp"> /****************************************************************************
- Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
- All rights reserved.
- Contact: Nokia Corporation (qt-info@nokia.com)
- This file is part of the examples of the Qt Toolkit.
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- packaging of this file. Please review the following information to
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- version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
- GNU General Public License Usage
- Alternatively, this file may be used under the terms of the GNU
- General Public License version 3.0 as published by the Free Software
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- $QT_END_LICENSE$
-
- /
- ifndef CONNECTION_H
- define CONNECTION_H
- include <QMessageBox>
- include <QSqlDatabase>
- include <QSqlError>
- include <QSqlQuery>
/*
This file defines a helper function to open a connection to an in-memory SQLITE database and to create a test table. If you want to use another database, simply modify the code below. All the examples in this directory use this function to connect to a database.
- /
static bool createConnection() {
QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE"); db.setDatabaseName(":memory:"); if (!db.open()) { QMessageBox::critical(0, qApp->tr("Cannot open database"), qApp->tr("Unable to establish a database connection.\n" "This example needs SQLite support. Please read " "the Qt SQL driver documentation for information how " "to build it.\n\n" "Click Cancel to exit."), QMessageBox::Cancel); return false; } QSqlQuery query; query.exec("create table person (id int primary key, " "firstname varchar(20), lastname varchar(20))"); query.exec("insert into person values(101, "Danny", "Young")"); query.exec("insert into person values(102, "Christine", "Holand")"); query.exec("insert into person values(103, "Lars", "Gordon")"); query.exec("insert into person values(104, "Roberto", "Robitaille")"); query.exec("insert into person values(105, "Maria", "Papadopoulos")"); query.exec("create table offices (id int primary key," "imagefile int," "location varchar(20)," "country varchar(20)," "description varchar(100))"); query.exec("insert into offices " "values(0, 0, "Oslo", "Norway"," ""Oslo is home to more than 500 000 citizens and has a " "lot to offer.It has been called \"The city with the big " "heart\" and this is a nickname we are happy to live up to.")"); query.exec("insert into offices " "values(1, 1, "Brisbane", "Australia"," ""Brisbane is the capital of Queensland, the Sunshine State, " "where it is beautiful one day, perfect the next. " "Brisbane is Australia""s 3rd largest city, being home " "to almost 2 million people.")"); query.exec("insert into offices " "values(2, 2, "Redwood City", "US"," ""You find Redwood City in the heart of the Bay Area " "just north of Silicon Valley. The largest nearby city is " "San Jose which is the third largest city in California " "and the 10th largest in the US.")"); query.exec("insert into offices " "values(3, 3, "Berlin", "Germany"," ""Berlin, the capital of Germany is dynamic, cosmopolitan " "and creative, allowing for every kind of lifestyle. " "East meets West in the metropolis at the heart of a " "changing Europe.")"); query.exec("insert into offices " "values(4, 4, "Munich", "Germany"," ""Several technology companies are represented in Munich, " "and the city is often called the \"Bavarian Silicon Valley\". " "The exciting city is also filled with culture, " "art and music. ")"); query.exec("insert into offices " "values(5, 5, "Beijing", "China"," ""Beijing as a capital city has more than 3000 years of " "history. Today the city counts 12 million citizens, and " "is the political, economic and cultural centre of China.")"); query.exec("create table images (locationid int, file varchar(20))"); query.exec("insert into images values(0, "images/oslo.png")"); query.exec("insert into images values(1, "images/brisbane.png")"); query.exec("insert into images values(2, "images/redwood.png")"); query.exec("insert into images values(3, "images/berlin.png")"); query.exec("insert into images values(4, "images/munich.png")"); query.exec("insert into images values(5, "images/beijing.png")");
return true;
}
- endif
- include <QtGui>
- include <QtSql>
- include "../connection.h"
void initializeModel(QSqlTableModel *model) {
model->setTable("person"); model->setEditStrategy(QSqlTableModel::OnManualSubmit); model->select(); model->setHeaderData(0, Qt::Horizontal, QObject::tr("ID")); model->setHeaderData(1, Qt::Horizontal, QObject::tr("First name")); model->setHeaderData(2, Qt::Horizontal, QObject::tr("Last name"));
} QTableView *createView(const QString &title, QSqlTableModel *model) {
QTableView *view = new QTableView; view->setModel(model); view->setWindowTitle(title); return view;
} int main(int argc, char *argv[]) {
QApplication app(argc, argv); if (!createConnection()) return 1; QSqlTableModel model; initializeModel(&model); QTableView *view1 = createView(QObject::tr("Table Model (View 1)"), &model); QTableView *view2 = createView(QObject::tr("Table Model (View 2)"), &model); view1->show(); view2->move(view1->x() + view1->width() + 20, view1->y()); view2->show(); return app.exec();
}
</source>