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Copeland Rick - Essential SQLAlchemy: mapping Python to databases

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Copeland Rick Essential SQLAlchemy: mapping Python to databases
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Dive into SQLAlchemy, the popular, open-source code library that helps Python programmers work with relational databases such as Oracle, MySQL, PostgresSQL, and SQLite. Using real-world examples, this practical guide shows you how to build a simple database application with SQLAlchemy, and how to connect to multiple databases simultaneously with the same metadata.

SQL is a powerful language for querying and manipulating data, but its tough to integrate it with your application. SQLAlchemy helps you map Python objects to database tables without substantially changing your existing Python code. If youre an intermediate Python developer with knowledge of basic SQL syntax and relational theory, this book serves as both a learning tool and a handy reference.

Essential SQLAlchemy includes several sections:

  • SQLAlchemy Core: Provide database services to your applications in a Pythonic way with the SQL Expression Language
  • SQLAlchemy ORM: Use...
  • Copeland Rick: author's other books


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    Essential SQLAlchemy

    by Jason Myers and Rick Copeland

    Copyright 2016 Jason Myers and Rick Copeland. All rights reserved.

    Printed in the United States of America.

    Published by OReilly Media, Inc. , 1005 Gravenstein Highway North, Sebastopol, CA 95472.

    OReilly books may be purchased for educational, business, or sales promotional use. Online editions are also available for most titles (http://safaribooksonline.com). For more information, contact our corporate/institutional sales department: 800-998-9938 or corporate@oreilly.com .

    • Editors: Dawn Schanafelt and Meghan Blanchette
    • Production Editor: Shiny Kalapurakkel
    • Copyeditor: Charles Roumeliotis
    • Proofreader: Jasmine Kwityn
    • Indexer: Angela Howard
    • Interior Designer: David Futato
    • Cover Designer: Karen Montgomery
    • Illustrator: Rebecca Demarest
    • June 2008: First Edition
    • December 2015: Second Edition
    Revision History for the Second Edition
    • 2015-11-20: First Release

    See http://oreilly.com/catalog/errata.csp?isbn=9781491916469 for release details.

    The OReilly logo is a registered trademark of OReilly Media, Inc. Essential SQLAlchemy, the cover image, and related trade dress are trademarks of OReilly Media, Inc.

    While the publisher and the authors have used good faith efforts to ensure that the information and instructions contained in this work are accurate, the publisher and the authors disclaim all responsibility for errors or omissions, including without limitation responsibility for damages resulting from the use of or reliance on this work. Use of the information and instructions contained in this work is at your own risk. If any code samples or other technology this work contains or describes is subject to open source licenses or the intellectual property rights of others, it is your responsibility to ensure that your use thereof complies with such licenses and/or rights.

    978-1-491-91646-9

    [LSI]

    Preface

    We are surrounded by data everywhere, and your ability to store, update, and report on that data is critical to every application you build. Whether you are developing for the Web, the desktop, or other applications, you need fast and secure access to data. Relational databases are still one of the most common places to put that data.

    SQL is a powerful language for querying and manipulating data in a database, but sometimes its tough to integrate it with the rest of your application. You may have used string manipulation to generate queries to run over an ODBC interface, or used a DB API as a Python programmer. While those can be effective ways to handle data, they can make security and database changes very difficult.

    This book is about a very powerful and flexible Python library named SQLAlchemy that bridges the gap between relational databases and traditional programming. While SQLAlchemy allows you to drop down into raw SQL to execute your queries, it encourages higher-level thinking through a more Pythonic and friendly approach to database queries and updates. It supplies the tools that let you map your applications classes and objects to database tables once and then to forget about it, or to return to your model again and again to fine-tune performance.

    SQLAlchemy is powerful and flexible, but it can also be a little daunting. SQL Alchemy tutorials expose only a fraction of whats available in this excellent library, and though the online documentation is extensive, it is often better as a reference than as a way to learn the library initially. This book is meant as a learning tool and a handy reference for when youre in implementation mode and need an answer fast.

    This book focuses on the 1.0 release of SQLAlchemy; however, much of what we will cover has been available for many of the previous versions. It certainly works from 0.8 forward with minor tweaking, and most of it from 0.5.

    This book has been written in three major parts: SQLAlchemy Core, SQLAlchemy ORM, and an Alembic section. The first two parts are meant to mirror each other as closely as possible. We have taken care to perform the same examples in each part so that you can compare and contrast the two main ways of using SQLAlchemy. The book is also written so that you can read both the SQLAlchemy Core and ORM parts or just the one suits your needs at the moment.

    Who This Book Is For

    This book is intended for those who want to learn more about how to use relational databases in their Python programs, or have heard about SQLAlchemy and want more information on it. To get the most out of this book, the reader should have intermediate Python skills and at least moderate exposure to SQL databases. While we have worked hard to make the material accessible, if you are just getting started with Python, we recommend reading Introducing Python by Bill Lubanovic or watching the Introduction to Python videos by Jessica McKellar as they are both fantastic resources. If you are new to SQL and databases, check out Learning SQL by Alan Beaulieu. These will fill in any missing gaps as you work through this book.

    How to Use the Examples

    Most .

    Assumptions This Book Makes

    This book assumes basic knowledge about Python syntax and semantics, particularly versions 2.7 and later. In particular, the reader should be familiar with iteration and working with objects in Python, as these are used frequently throughout the book. The second part of the book deals extensively with object-oriented programming and the SQLAlchemy ORM. The reader should also know basic SQL syntax and relational theory, as this book assumes familiarity with the SQL concepts of defining schema and tables along with creating SELECT, INSERT, UPDATE, and DELETE statements.

    Conventions Used in This Book

    The following typographical conventions are used in this book:

    Italic

    Indicates new terms, URLs, email addresses, filenames, and file extensions.

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    Used for program listings, as well as within paragraphs to refer to program elements such as variable or function names, databases, data types, environment variables, statements, and keywords.

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    Using Code Examples

    Supplemental material (code examples, exercises, etc.) is available for download at link: https://github.com/oreillymedia/essential-sqlalchemy-2e.

    This book is here to help you get your job done. In general, if example code is offered with this book, you may use it in your programs and documentation. You do not need to contact us for permission unless youre reproducing a significant portion of the code. For example, writing a program that uses several chunks of code from this book does not require permission. Selling or distributing a CD-ROM of examples from OReilly books does require permission. Answering a question by citing this book and quoting example code does not require permission. Incorporating a significant amount of example code from this book into your products documentation does require permission.

    We appreciate, but do not require, attribution. An attribution usually includes the title, author, publisher, and ISBN. For example:

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