window.cpp Example File

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#include <QtWidgets> #include <QtSql> #include "window.h" 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); 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); connect(previousButton, &QPushButton::clicked, mapper, &QDataWidgetMapper::toPrevious); connect(nextButton, &QPushButton::clicked, mapper, &QDataWidgetMapper::toNext); connect(mapper, &QDataWidgetMapper::currentIndexChanged, this, &Window::updateButtons); 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(); } void Window::setupModel() { QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE"); db.setDatabaseName(":memory:"); if (! { 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)"); 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(); } void Window::updateButtons(int row) { previousButton->setEnabled(row > 0); nextButton->setEnabled(row < model->rowCount() - 1); }

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