qt 6.5.1 original

examples/sql/books/CMakeLists.txt

@@ -0,0 +1,52 @@
+# Copyright (C) 2022 The Qt Company Ltd.
+# SPDX-License-Identifier: BSD-3-Clause
+
+cmake_minimum_required(VERSION 3.16)
+project(books LANGUAGES CXX)
+
+if(NOT DEFINED INSTALL_EXAMPLESDIR)
+    set(INSTALL_EXAMPLESDIR "examples")
+endif()
+
+set(INSTALL_EXAMPLEDIR "${INSTALL_EXAMPLESDIR}/sql/books")
+
+find_package(Qt6 REQUIRED COMPONENTS Core Gui Sql Widgets)
+
+qt_standard_project_setup()
+
+qt_add_executable(books
+    bookdelegate.cpp bookdelegate.h
+    bookwindow.cpp bookwindow.h bookwindow.ui
+    initdb.h
+    main.cpp
+)
+
+set_target_properties(books PROPERTIES
+    WIN32_EXECUTABLE TRUE
+    MACOSX_BUNDLE TRUE
+)
+
+target_link_libraries(books PRIVATE
+    Qt6::Core
+    Qt6::Gui
+    Qt6::Sql
+    Qt6::Widgets
+)
+
+# Resources:
+set(books_resource_files
+    "images/star.png"
+)
+
+qt_add_resources(books "books"
+    PREFIX
+        "/"
+    FILES
+        ${books_resource_files}
+)
+
+install(TARGETS books
+    RUNTIME DESTINATION "${INSTALL_EXAMPLEDIR}"
+    BUNDLE DESTINATION "${INSTALL_EXAMPLEDIR}"
+    LIBRARY DESTINATION "${INSTALL_EXAMPLEDIR}"
+)

examples/sql/books/bookdelegate.cpp

@@ -0,0 +1,91 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "bookdelegate.h"
+
+#include <QtWidgets>
+
+BookDelegate::BookDelegate(QObject *parent)
+    : QSqlRelationalDelegate(parent), star(QPixmap(":images/star.png"))
+{
+}
+
+void BookDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
+                           const QModelIndex &index) const
+{
+    if (index.column() != 5) {
+        QSqlRelationalDelegate::paint(painter, option, index);
+    } else {
+        const QAbstractItemModel *model = index.model();
+        QPalette::ColorGroup cg = (option.state & QStyle::State_Enabled) ?
+            (option.state & QStyle::State_Active) ?
+                        QPalette::Normal :
+                        QPalette::Inactive :
+                        QPalette::Disabled;
+
+        if (option.state & QStyle::State_Selected)
+            painter->fillRect(
+                        option.rect,
+                        option.palette.color(cg, QPalette::Highlight));
+
+        int rating = model->data(index, Qt::DisplayRole).toInt();
+        int width = star.width();
+        int height = star.height();
+        int x = option.rect.x();
+        int y = option.rect.y() + (option.rect.height() / 2) - (height / 2);
+        for (int i = 0; i < rating; ++i) {
+            painter->drawPixmap(x, y, star);
+            x += width;
+        }
+    }
+
+    QPen pen = painter->pen();
+    painter->setPen(option.palette.color(QPalette::Mid));
+    painter->drawLine(option.rect.bottomLeft(), option.rect.bottomRight());
+    painter->drawLine(option.rect.topRight(), option.rect.bottomRight());
+    painter->setPen(pen);
+}
+
+QSize BookDelegate::sizeHint(const QStyleOptionViewItem &option,
+                                 const QModelIndex &index) const
+{
+    if (index.column() == 5)
+        return QSize(5 * star.width(), star.height()) + QSize(1, 1);
+    // Since we draw the grid ourselves:
+    return QSqlRelationalDelegate::sizeHint(option, index) + QSize(1, 1);
+}
+
+bool BookDelegate::editorEvent(QEvent *event, QAbstractItemModel *model,
+                               const QStyleOptionViewItem &option,
+                               const QModelIndex &index)
+{
+    if (index.column() != 5)
+        return QSqlRelationalDelegate::editorEvent(event, model, option, index);
+
+    if (event->type() == QEvent::MouseButtonPress) {
+        QMouseEvent *mouseEvent = static_cast<QMouseEvent*>(event);
+        int stars = qBound(0, int(0.7 + qreal(mouseEvent->position().toPoint().x()
+            - option.rect.x()) / star.width()), 5);
+        model->setData(index, QVariant(stars));
+        // So that the selection can change:
+        return false;
+    }
+
+    return true;
+}
+
+QWidget *BookDelegate::createEditor(QWidget *parent,
+                                    const QStyleOptionViewItem &option,
+                                    const QModelIndex &index) const
+{
+    if (index.column() != 4)
+        return QSqlRelationalDelegate::createEditor(parent, option, index);
+
+    // For editing the year, return a spinbox with a range from -1000 to 2100.
+    QSpinBox *sb = new QSpinBox(parent);
+    sb->setFrame(false);
+    sb->setMaximum(2100);
+    sb->setMinimum(-1000);
+
+    return sb;
+}

examples/sql/books/bookdelegate.h

@@ -0,0 +1,36 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef BOOKDELEGATE_H
+#define BOOKDELEGATE_H
+
+#include <QModelIndex>
+#include <QPixmap>
+#include <QSize>
+#include <QSqlRelationalDelegate>
+
+QT_FORWARD_DECLARE_CLASS(QPainter)
+
+class BookDelegate : public QSqlRelationalDelegate
+{
+public:
+    BookDelegate(QObject *parent);
+
+    void paint(QPainter *painter, const QStyleOptionViewItem &option,
+               const QModelIndex &index) const override;
+
+    QSize sizeHint(const QStyleOptionViewItem &option,
+                   const QModelIndex &index) const override;
+
+    bool editorEvent(QEvent *event, QAbstractItemModel *model,
+                     const QStyleOptionViewItem &option,
+                     const QModelIndex &index) override;
+
+    QWidget *createEditor(QWidget *parent, const QStyleOptionViewItem &option,
+                          const QModelIndex &index) const override;
+
+private:
+    QPixmap star;
+};
+
+#endif

examples/sql/books/books.pro

@@ -0,0 +1,13 @@
+TEMPLATE = app
+INCLUDEPATH += .
+
+HEADERS     = bookdelegate.h bookwindow.h initdb.h
+RESOURCES   = books.qrc
+SOURCES     = bookdelegate.cpp main.cpp bookwindow.cpp
+FORMS       = bookwindow.ui
+
+QT += sql widgets widgets
+requires(qtConfig(tableview))
+
+target.path = $$[QT_INSTALL_EXAMPLES]/sql/books
+INSTALLS += target

examples/sql/books/books.qrc

@@ -0,0 +1,5 @@
+<!DOCTYPE RCC><RCC version="1.0">
+<qresource prefix="/">
+  <file>images/star.png</file>
+</qresource>
+</RCC>

examples/sql/books/bookwindow.cpp

@@ -0,0 +1,124 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "bookwindow.h"
+#include "bookdelegate.h"
+#include "initdb.h"
+
+#include <QtSql>
+
+BookWindow::BookWindow()
+{
+    ui.setupUi(this);
+
+    if (!QSqlDatabase::drivers().contains("QSQLITE"))
+        QMessageBox::critical(
+                    this,
+                    "Unable to load database",
+                    "This demo needs the SQLITE driver"
+                    );
+
+    // Initialize the database:
+    QSqlError err = initDb();
+    if (err.type() != QSqlError::NoError) {
+        showError(err);
+        return;
+    }
+
+    // Create the data model:
+    model = new QSqlRelationalTableModel(ui.bookTable);
+    model->setEditStrategy(QSqlTableModel::OnManualSubmit);
+    model->setTable("books");
+
+    // Remember the indexes of the columns:
+    authorIdx = model->fieldIndex("author");
+    genreIdx = model->fieldIndex("genre");
+
+    // Set the relations to the other database tables:
+    model->setRelation(authorIdx, QSqlRelation("authors", "id", "name"));
+    model->setRelation(genreIdx, QSqlRelation("genres", "id", "name"));
+
+    // Set the localized header captions:
+    model->setHeaderData(authorIdx, Qt::Horizontal, tr("Author Name"));
+    model->setHeaderData(genreIdx, Qt::Horizontal, tr("Genre"));
+    model->setHeaderData(model->fieldIndex("title"),
+                         Qt::Horizontal, tr("Title"));
+    model->setHeaderData(model->fieldIndex("year"), Qt::Horizontal, tr("Year"));
+    model->setHeaderData(model->fieldIndex("rating"),
+                         Qt::Horizontal, tr("Rating"));
+
+    // Populate the model:
+    if (!model->select()) {
+        showError(model->lastError());
+        return;
+    }
+
+    // Set the model and hide the ID column:
+    ui.bookTable->setModel(model);
+    ui.bookTable->setItemDelegate(new BookDelegate(ui.bookTable));
+    ui.bookTable->setColumnHidden(model->fieldIndex("id"), true);
+    ui.bookTable->setSelectionMode(QAbstractItemView::SingleSelection);
+
+    // Initialize the Author combo box:
+    ui.authorEdit->setModel(model->relationModel(authorIdx));
+    ui.authorEdit->setModelColumn(
+                model->relationModel(authorIdx)->fieldIndex("name"));
+
+    ui.genreEdit->setModel(model->relationModel(genreIdx));
+    ui.genreEdit->setModelColumn(
+                model->relationModel(genreIdx)->fieldIndex("name"));
+
+    // Lock and prohibit resizing of the width of the rating column:
+    ui.bookTable->horizontalHeader()->setSectionResizeMode(
+                model->fieldIndex("rating"),
+                QHeaderView::ResizeToContents);
+
+    QDataWidgetMapper *mapper = new QDataWidgetMapper(this);
+    mapper->setModel(model);
+    mapper->setItemDelegate(new BookDelegate(this));
+    mapper->addMapping(ui.titleEdit, model->fieldIndex("title"));
+    mapper->addMapping(ui.yearEdit, model->fieldIndex("year"));
+    mapper->addMapping(ui.authorEdit, authorIdx);
+    mapper->addMapping(ui.genreEdit, genreIdx);
+    mapper->addMapping(ui.ratingEdit, model->fieldIndex("rating"));
+
+    connect(ui.bookTable->selectionModel(),
+            &QItemSelectionModel::currentRowChanged,
+            mapper,
+            &QDataWidgetMapper::setCurrentModelIndex
+            );
+
+    ui.bookTable->setCurrentIndex(model->index(0, 0));
+    createMenuBar();
+}
+
+void BookWindow::showError(const QSqlError &err)
+{
+    QMessageBox::critical(this, "Unable to initialize Database",
+                "Error initializing database: " + err.text());
+}
+
+void BookWindow::createMenuBar()
+{
+    QAction *quitAction = new QAction(tr("&Quit"), this);
+    QAction *aboutAction = new QAction(tr("&About"), this);
+    QAction *aboutQtAction = new QAction(tr("&About Qt"), this);
+
+    QMenu *fileMenu = menuBar()->addMenu(tr("&File"));
+    fileMenu->addAction(quitAction);
+
+    QMenu *helpMenu = menuBar()->addMenu(tr("&Help"));
+    helpMenu->addAction(aboutAction);
+    helpMenu->addAction(aboutQtAction);
+
+    connect(quitAction, &QAction::triggered, qApp, &QCoreApplication::quit);
+    connect(aboutAction, &QAction::triggered, this, &BookWindow::about);
+    connect(aboutQtAction, &QAction::triggered, qApp, &QApplication::aboutQt);
+}
+
+void BookWindow::about()
+{
+    QMessageBox::about(this, tr("About Books"),
+            tr("<p>The <b>Books</b> example shows how to use Qt SQL classes "
+               "with a model/view framework."));
+}

examples/sql/books/bookwindow.h

@@ -0,0 +1,31 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef BOOKWINDOW_H
+#define BOOKWINDOW_H
+
+#include <QtWidgets>
+#include <QtSql>
+
+#include "ui_bookwindow.h"
+
+
+class BookWindow: public QMainWindow
+{
+    Q_OBJECT
+public:
+    BookWindow();
+
+private slots:
+    void about();
+
+private:
+    void showError(const QSqlError &err);
+    Ui::BookWindow ui;
+    QSqlRelationalTableModel *model;
+    int authorIdx, genreIdx;
+
+    void createMenuBar();
+};
+
+#endif

examples/sql/books/bookwindow.ui

@@ -0,0 +1,164 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ui version="4.0">
+ <class>BookWindow</class>
+ <widget class="QMainWindow" name="BookWindow">
+  <property name="geometry">
+   <rect>
+    <x>0</x>
+    <y>0</y>
+    <width>601</width>
+    <height>420</height>
+   </rect>
+  </property>
+  <property name="windowTitle">
+   <string>Books</string>
+  </property>
+  <widget class="QWidget" name="centralWidget">
+   <layout class="QVBoxLayout">
+    <property name="spacing">
+     <number>6</number>
+    </property>
+    <property name="leftMargin">
+     <number>9</number>
+    </property>
+    <property name="topMargin">
+     <number>9</number>
+    </property>
+    <property name="rightMargin">
+     <number>9</number>
+    </property>
+    <property name="bottomMargin">
+     <number>9</number>
+    </property>
+    <item>
+     <widget class="QGroupBox" name="groupBox">
+      <property name="title">
+       <string/>
+      </property>
+      <layout class="QVBoxLayout">
+       <property name="spacing">
+        <number>6</number>
+       </property>
+       <property name="leftMargin">
+        <number>9</number>
+       </property>
+       <property name="topMargin">
+        <number>9</number>
+       </property>
+       <property name="rightMargin">
+        <number>9</number>
+       </property>
+       <property name="bottomMargin">
+        <number>9</number>
+       </property>
+       <item>
+        <widget class="QTableView" name="bookTable">
+         <property name="selectionBehavior">
+          <enum>QAbstractItemView::SelectRows</enum>
+         </property>
+        </widget>
+       </item>
+       <item>
+        <widget class="QGroupBox" name="groupBox_2">
+         <property name="title">
+          <string>Details</string>
+         </property>
+         <layout class="QFormLayout">
+          <item row="0" column="0">
+           <widget class="QLabel" name="label_5">
+            <property name="text">
+             <string>&lt;b&gt;Title:&lt;/b&gt;</string>
+            </property>
+           </widget>
+          </item>
+          <item row="0" column="1">
+           <widget class="QLineEdit" name="titleEdit">
+            <property name="enabled">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+          <item row="1" column="0">
+           <widget class="QLabel" name="label_2">
+            <property name="text">
+             <string>&lt;b&gt;Author: &lt;/b&gt;</string>
+            </property>
+           </widget>
+          </item>
+          <item row="1" column="1">
+           <widget class="QComboBox" name="authorEdit">
+            <property name="enabled">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+          <item row="2" column="0">
+           <widget class="QLabel" name="label_3">
+            <property name="text">
+             <string>&lt;b&gt;Genre:&lt;/b&gt;</string>
+            </property>
+           </widget>
+          </item>
+          <item row="2" column="1">
+           <widget class="QComboBox" name="genreEdit">
+            <property name="enabled">
+             <bool>true</bool>
+            </property>
+           </widget>
+          </item>
+          <item row="3" column="0">
+           <widget class="QLabel" name="label_4">
+            <property name="text">
+             <string>&lt;b&gt;Year:&lt;/b&gt;</string>
+            </property>
+           </widget>
+          </item>
+          <item row="3" column="1">
+           <widget class="QSpinBox" name="yearEdit">
+            <property name="enabled">
+             <bool>true</bool>
+            </property>
+            <property name="prefix">
+             <string/>
+            </property>
+            <property name="minimum">
+             <number>-1000</number>
+            </property>
+            <property name="maximum">
+             <number>2100</number>
+            </property>
+           </widget>
+          </item>
+          <item row="4" column="0">
+           <widget class="QLabel" name="label">
+            <property name="text">
+             <string>&lt;b&gt;Rating:&lt;/b&gt;</string>
+            </property>
+           </widget>
+          </item>
+          <item row="4" column="1">
+           <widget class="QSpinBox" name="ratingEdit">
+            <property name="maximum">
+             <number>5</number>
+            </property>
+           </widget>
+          </item>
+         </layout>
+        </widget>
+       </item>
+      </layout>
+     </widget>
+    </item>
+   </layout>
+  </widget>
+ </widget>
+ <tabstops>
+  <tabstop>bookTable</tabstop>
+  <tabstop>titleEdit</tabstop>
+  <tabstop>authorEdit</tabstop>
+  <tabstop>genreEdit</tabstop>
+  <tabstop>yearEdit</tabstop>
+ </tabstops>
+ <resources/>
+ <connections/>
+</ui>

examples/sql/books/initdb.h

@@ -0,0 +1,113 @@
+// Copyright (C) 2020 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#ifndef INITDB_H
+#define INITDB_H
+
+#include <QtSql>
+
+void addBook(QSqlQuery &q, const QString &title, int year, const QVariant &authorId,
+             const QVariant &genreId, int rating)
+{
+    q.addBindValue(title);
+    q.addBindValue(year);
+    q.addBindValue(authorId);
+    q.addBindValue(genreId);
+    q.addBindValue(rating);
+    q.exec();
+}
+
+QVariant addGenre(QSqlQuery &q, const QString &name)
+{
+    q.addBindValue(name);
+    q.exec();
+    return q.lastInsertId();
+}
+
+QVariant addAuthor(QSqlQuery &q, const QString &name, QDate birthdate)
+{
+    q.addBindValue(name);
+    q.addBindValue(birthdate);
+    q.exec();
+    return q.lastInsertId();
+}
+
+const auto BOOKS_SQL = QLatin1String(R"(
+    create table books(id integer primary key, title varchar, author integer,
+                       genre integer, year integer, rating integer)
+    )");
+
+const auto AUTHORS_SQL =  QLatin1String(R"(
+    create table authors(id integer primary key, name varchar, birthdate date)
+    )");
+
+const auto GENRES_SQL = QLatin1String(R"(
+    create table genres(id integer primary key, name varchar)
+    )");
+
+const auto INSERT_AUTHOR_SQL = QLatin1String(R"(
+    insert into authors(name, birthdate) values(?, ?)
+    )");
+
+const auto INSERT_BOOK_SQL = QLatin1String(R"(
+    insert into books(title, year, author, genre, rating)
+                      values(?, ?, ?, ?, ?)
+    )");
+
+const auto INSERT_GENRE_SQL = QLatin1String(R"(
+    insert into genres(name) values(?)
+    )");
+
+QSqlError initDb()
+{
+    QSqlDatabase db = QSqlDatabase::addDatabase("QSQLITE");
+    db.setDatabaseName(":memory:");
+
+    if (!db.open())
+        return db.lastError();
+
+    QStringList tables = db.tables();
+    if (tables.contains("books", Qt::CaseInsensitive)
+        && tables.contains("authors", Qt::CaseInsensitive))
+        return QSqlError();
+
+    QSqlQuery q;
+    if (!q.exec(BOOKS_SQL))
+        return q.lastError();
+    if (!q.exec(AUTHORS_SQL))
+        return q.lastError();
+    if (!q.exec(GENRES_SQL))
+        return q.lastError();
+
+    if (!q.prepare(INSERT_AUTHOR_SQL))
+        return q.lastError();
+    QVariant asimovId = addAuthor(q, QLatin1String("Isaac Asimov"), QDate(1920, 2, 1));
+    QVariant greeneId = addAuthor(q, QLatin1String("Graham Greene"), QDate(1904, 10, 2));
+    QVariant pratchettId = addAuthor(q, QLatin1String("Terry Pratchett"), QDate(1948, 4, 28));
+
+    if (!q.prepare(INSERT_GENRE_SQL))
+        return q.lastError();
+    QVariant sfiction = addGenre(q, QLatin1String("Science Fiction"));
+    QVariant fiction = addGenre(q, QLatin1String("Fiction"));
+    QVariant fantasy = addGenre(q, QLatin1String("Fantasy"));
+
+    if (!q.prepare(INSERT_BOOK_SQL))
+        return q.lastError();
+    addBook(q, QLatin1String("Foundation"), 1951, asimovId, sfiction, 3);
+    addBook(q, QLatin1String("Foundation and Empire"), 1952, asimovId, sfiction, 4);
+    addBook(q, QLatin1String("Second Foundation"), 1953, asimovId, sfiction, 3);
+    addBook(q, QLatin1String("Foundation's Edge"), 1982, asimovId, sfiction, 3);
+    addBook(q, QLatin1String("Foundation and Earth"), 1986, asimovId, sfiction, 4);
+    addBook(q, QLatin1String("Prelude to Foundation"), 1988, asimovId, sfiction, 3);
+    addBook(q, QLatin1String("Forward the Foundation"), 1993, asimovId, sfiction, 3);
+    addBook(q, QLatin1String("The Power and the Glory"), 1940, greeneId, fiction, 4);
+    addBook(q, QLatin1String("The Third Man"), 1950, greeneId, fiction, 5);
+    addBook(q, QLatin1String("Our Man in Havana"), 1958, greeneId, fiction, 4);
+    addBook(q, QLatin1String("Guards! Guards!"), 1989, pratchettId, fantasy, 3);
+    addBook(q, QLatin1String("Night Watch"), 2002, pratchettId, fantasy, 3);
+    addBook(q, QLatin1String("Going Postal"), 2004, pratchettId, fantasy, 3);
+
+    return QSqlError();
+}
+
+#endif

examples/sql/books/main.cpp

@@ -0,0 +1,18 @@
+// Copyright (C) 2016 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
+
+#include "bookwindow.h"
+
+#include <QtWidgets>
+
+int main(int argc, char * argv[])
+{
+    Q_INIT_RESOURCE(books);
+
+    QApplication app(argc, argv);
+
+    BookWindow win;
+    win.show();
+
+    return app.exec();
+}