Data mapper
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#ifndef WINDOW_H
#define WINDOW_H
#include <QWidget>
QT_BEGIN_NAMESPACE
class QComboBox;
class QDataWidgetMapper;
class QItemSelectionModel;
class QLabel;
class QLineEdit;
class QPushButton;
class QSqlRelationalTableModel;
class QStandardItemModel;
class QStringListModel;
class QTextEdit;
QT_END_NAMESPACE
//! [Window definition]
class Window : public QWidget
{
Q_OBJECT
public:
Window(QWidget *parent = 0);
private slots:
void updateButtons(int row);
private:
void setupModel();
QLabel *nameLabel;
QLabel *addressLabel;
QLabel *typeLabel;
QLineEdit *nameEdit;
QTextEdit *addressEdit;
QComboBox *typeComboBox;
QPushButton *nextButton;
QPushButton *previousButton;
QSqlRelationalTableModel *model;
QItemSelectionModel *selectionModel;
QDataWidgetMapper *mapper;
int typeIndex;
};
//! [Window definition]
#endif
#include <QtGui>
#include <QtSql>
#include "window.h"
//! [Set up widgets]
Window::Window(QWidget *parent)
: QWidget(parent)
{
setupModel();
nameLabel = new QLabel(tr("Na&me:"));
nameEdit = new QLineEdit();
addressLabel = new QLabel(tr("&Address:"));
addressEdit = new QTextEdit();
typeLabel = new QLabel(tr("&Type:"));
typeComboBox = new QComboBox();
nextButton = new QPushButton(tr("&Next"));
previousButton = new QPushButton(tr("&Previous"));
nameLabel->setBuddy(nameEdit);
addressLabel->setBuddy(addressEdit);
typeLabel->setBuddy(typeComboBox);
//! [Set up widgets]
//! [Set up the mapper]
QSqlTableModel *relModel = model->relationModel(typeIndex);
typeComboBox->setModel(relModel);
typeComboBox->setModelColumn(relModel->fieldIndex("description"));
mapper = new QDataWidgetMapper(this);
mapper->setModel(model);
mapper->setItemDelegate(new QSqlRelationalDelegate(this));
mapper->addMapping(nameEdit, model->fieldIndex("name"));
mapper->addMapping(addressEdit, model->fieldIndex("address"));
mapper->addMapping(typeComboBox, typeIndex);
//! [Set up the mapper]
//! [Set up connections and layouts]
connect(previousButton, SIGNAL(clicked()),
mapper, SLOT(toPrevious()));
connect(nextButton, SIGNAL(clicked()),
mapper, SLOT(toNext()));
connect(mapper, SIGNAL(currentIndexChanged(int)),
this, SLOT(updateButtons(int)));
QGridLayout *layout = new QGridLayout();
layout->addWidget(nameLabel, 0, 0, 1, 1);
layout->addWidget(nameEdit, 0, 1, 1, 1);
layout->addWidget(previousButton, 0, 2, 1, 1);
layout->addWidget(addressLabel, 1, 0, 1, 1);
layout->addWidget(addressEdit, 1, 1, 2, 1);
layout->addWidget(nextButton, 1, 2, 1, 1);
layout->addWidget(typeLabel, 3, 0, 1, 1);
layout->addWidget(typeComboBox, 3, 1, 1, 1);
setLayout(layout);
setWindowTitle(tr("SQL Widget Mapper"));
mapper->toFirst();
}
//! [Set up connections and layouts]
//! [Set up the main table]
void Window::setupModel()
{
QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
db.setDatabaseName(":memory:");
if (!db.open()) {
QMessageBox::critical(0, tr("Cannot open database"),
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."), QMessageBox::Cancel);
return;
}
QSqlQuery query;
query.exec("create table person (id int primary key, "
"name varchar(20), address varchar(200), typeid int)");
query.exec("insert into person values(1, 'Alice', "
"'<qt>123 Main Street<br/>Market Town</qt>', 101)");
query.exec("insert into person values(2, 'Bob', "
"'<qt>PO Box 32<br/>Mail Handling Service"
"<br/>Service City</qt>', 102)");
query.exec("insert into person values(3, 'Carol', "
"'<qt>The Lighthouse<br/>Remote Island</qt>', 103)");
query.exec("insert into person values(4, 'Donald', "
"'<qt>47338 Park Avenue<br/>Big City</qt>', 101)");
query.exec("insert into person values(5, 'Emma', "
"'<qt>Research Station<br/>Base Camp<br/>"
"Big Mountain</qt>', 103)");
//! [Set up the main table]
//! [Set up the address type table]
query.exec("create table addresstype (id int, description varchar(20))");
query.exec("insert into addresstype values(101, 'Home')");
query.exec("insert into addresstype values(102, 'Work')");
query.exec("insert into addresstype values(103, 'Other')");
model = new QSqlRelationalTableModel(this);
model->setTable("person");
model->setEditStrategy(QSqlTableModel::OnManualSubmit);
typeIndex = model->fieldIndex("typeid");
model->setRelation(typeIndex,
QSqlRelation("addresstype", "id", "description"));
model->select();
}
//! [Set up the address type table]
//! [Slot for updating the buttons]
void Window::updateButtons(int row)
{
previousButton->setEnabled(row > 0);
nextButton->setEnabled(row < model->rowCount() - 1);
}
//! [Slot for updating the buttons]
#include <QApplication>
#include "window.h"
int main(int argc, char **argv)
{
QApplication app(argc, argv);
Window window;
window.show();
return app.exec();
}
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