C++/Qt/QSqlTableModel
QSqlTableModel demo
<source lang="cpp"> /****************************************************************************
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- /
- 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>
