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diff --git a/sources/pyside2/doc/tutorials/portingguide/chapter3/createdb.py b/sources/pyside2/doc/tutorials/portingguide/chapter3/createdb.py
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+++ b/sources/pyside2/doc/tutorials/portingguide/chapter3/createdb.py
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+#############################################################################
+##
+## Copyright (C) 2019 The Qt Company Ltd.
+## Contact: http://www.qt.io/licensing/
+##
+## This file is part of the Qt for Python examples of the Qt Toolkit.
+##
+## $QT_BEGIN_LICENSE:BSD$
+## You may use this file under the terms of the BSD license as follows:
+##
+## "Redistribution and use in source and binary forms, with or without
+## modification, are permitted provided that the following conditions are
+## met:
+##   * Redistributions of source code must retain the above copyright
+##     notice, this list of conditions and the following disclaimer.
+##   * Redistributions in binary form must reproduce the above copyright
+##     notice, this list of conditions and the following disclaimer in
+##     the documentation and/or other materials provided with the
+##     distribution.
+##   * Neither the name of The Qt Company Ltd nor the names of its
+##     contributors may be used to endorse or promote products derived
+##     from this software without specific prior written permission.
+##
+##
+## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
+##
+## $QT_END_LICENSE$
+##
+#############################################################################
+
+from PySide2.QtSql import QSqlDatabase, QSqlError, QSqlQuery
+from datetime import date
+
+
+def add_book(q, title, year, authorId, genreId, rating):
+    q.addBindValue(title)
+    q.addBindValue(year)
+    q.addBindValue(authorId)
+    q.addBindValue(genreId)
+    q.addBindValue(rating)
+    q.exec_()
+
+
+def add_genre(q, name):
+    q.addBindValue(name)
+    q.exec_()
+    return q.lastInsertId()
+
+
+def add_author(q, name, birthdate):
+    q.addBindValue(name)
+    q.addBindValue(str(birthdate))
+    q.exec_()
+    return q.lastInsertId()
+
+BOOKS_SQL = """
+    create table books(id integer primary key, title varchar, author integer,
+                       genre integer, year integer, rating integer)
+    """
+AUTHORS_SQL = """
+    create table authors(id integer primary key, name varchar, birthdate text)
+    """
+GENRES_SQL = """
+    create table genres(id integer primary key, name varchar)
+    """
+INSERT_AUTHOR_SQL = """
+    insert into authors(name, birthdate) values(?, ?)
+    """
+INSERT_GENRE_SQL = """
+    insert into genres(name) values(?)
+    """
+INSERT_BOOK_SQL = """
+    insert into books(title, year, author, genre, rating)
+                values(?, ?, ?, ?, ?)
+    """
+
+def init_db():
+    """
+    init_db()
+    Initializes the database.
+    If tables "books" and "authors" are already in the database, do nothing.
+    Return value: None or raises ValueError
+    The error value is the QtSql error instance.
+    """
+    def check(func, *args):
+        if not func(*args):
+            raise ValueError(func.__self__.lastError())
+    db = QSqlDatabase.addDatabase("QSQLITE")
+    db.setDatabaseName(":memory:")
+
+    check(db.open)
+
+    q = QSqlQuery()
+    check(q.exec_, BOOKS_SQL)
+    check(q.exec_, AUTHORS_SQL)
+    check(q.exec_, GENRES_SQL)
+    check(q.prepare, INSERT_AUTHOR_SQL)
+
+    asimovId = add_author(q, "Isaac Asimov", date(1920, 2, 1))
+    greeneId = add_author(q, "Graham Greene", date(1904, 10, 2))
+    pratchettId = add_author(q, "Terry Pratchett", date(1948, 4, 28))
+
+    check(q.prepare,INSERT_GENRE_SQL)
+    sfiction = add_genre(q, "Science Fiction")
+    fiction = add_genre(q, "Fiction")
+    fantasy = add_genre(q, "Fantasy")
+
+    check(q.prepare,INSERT_BOOK_SQL)
+    add_book(q, "Foundation", 1951, asimovId, sfiction, 3)
+    add_book(q, "Foundation and Empire", 1952, asimovId, sfiction, 4)
+    add_book(q, "Second Foundation", 1953, asimovId, sfiction, 3)
+    add_book(q, "Foundation's Edge", 1982, asimovId, sfiction, 3)
+    add_book(q, "Foundation and Earth", 1986, asimovId, sfiction, 4)
+    add_book(q, "Prelude to Foundation", 1988, asimovId, sfiction, 3)
+    add_book(q, "Forward the Foundation", 1993, asimovId, sfiction, 3)
+    add_book(q, "The Power and the Glory", 1940, greeneId, fiction, 4)
+    add_book(q, "The Third Man", 1950, greeneId, fiction, 5)
+    add_book(q, "Our Man in Havana", 1958, greeneId, fiction, 4)
+    add_book(q, "Guards! Guards!", 1989, pratchettId, fantasy, 3)
+    add_book(q, "Night Watch", 2002, pratchettId, fantasy, 3)
+    add_book(q, "Going Postal", 2004, pratchettId, fantasy, 3)