SQLite数据库指南：嵌入式关系型数据库解析

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"MySQL权威指南英文版_第3版" SQLite是一种轻量级的数据库管理系统，它无需配置，可独立运行，常被嵌入到应用程序中。SQLite的特点在于其数据库实例完全封装在一个文件内，便于传输和简易设置。本书《Using SQLite》由Jay A. Kreibich撰写，详细介绍了SQLite数据库产品。 SQLite的使用涵盖了多种方面，包括但不限于以下几个核心知识点： 1. **SQLite架构**：SQLite作为一个关系型数据库引擎，它的设计允许在应用内部直接集成。这意味着开发人员可以在不依赖外部服务器或管理工具的情况下，轻松地在应用中使用数据库功能。 2. **零配置**：SQLite的零配置特性意味着不需要安装或管理数据库服务器，简化了部署流程，尤其适合于移动设备和嵌入式系统。 3. **自包含性**：SQLite数据库存储在单一文件中，这种自包含性使得数据的备份、恢复和迁移变得简单。用户只需复制文件即可完成数据库的转移。 4. **易于使用**：SQLite提供了一个SQL命令行接口以及API，支持多种编程语言（如C、Python、Java等），方便开发者进行数据库操作。 5. **性能优化**：SQLite虽然小巧，但性能优秀，它支持事务处理、索引、视图、触发器等高级数据库特性，可用于处理大量数据和复杂查询。 6. **安全性**：SQLite提供了一定程度的数据安全性和完整性，通过权限控制和加密功能，确保数据的安全。 7. **跨平台兼容**：SQLite可在多种操作系统上运行，如Windows、Linux、macOS等，这使其成为跨平台应用的理想选择。 8. **书籍内容**：《Using SQLite》一书详细讲解了SQLite的安装、基本操作、SQL语言的使用、事务处理、备份与恢复、性能调优、安全策略等多个主题，适合初学者和有经验的开发者参考学习。 9. **编辑与出版信息**：本书由O'Reilly Media, Inc.出版，是一本经过专业编辑、校对和设计的权威著作，对于学习和了解SQLite提供了全面且深入的指导。 10. **在线资源**：O'Reilly还提供了许多书籍的在线版本，读者可以通过Safari Books Online获取更多相关资源和技术支持。《Using SQLite》是一本全面介绍SQLite数据库的实用指南，无论你是初学者还是希望深入了解SQLite的开发者，都能从中受益。通过学习这本书，你将能够熟练掌握SQLite的使用，从而在实际项目中充分发挥其优势。

Preface

This book provides an introduction to the SQLite database product. SQLite is a zero-

configuration, standalone, relational database engine that is designed to be embedded

directly into an application. Database instances are self-contained within a single file,

allowing easy transport and simple setup.

Using SQLite is primarily written for experienced software developers that have never

had a particular need to learn about relational databases. For one reason or another,

you now find yourself with a large data management task, and are hoping a product

like SQLite may provide the answer. To help you out, the various chapters cover the

SQL language, the SQLite C programming API, and the basics of relational database

design, giving you everything you need to successfully integrate SQLite into your ap-

plications and development work.

The book is divided into two major sections. The first part is a traditional set of chapters

that are primarily designed to be read in order. The first two chapters provide an in-

depth look at exactly what SQLite provides and how it can be used. The third chapter

covers downloading and building the library. Chapters Four and Five provide an in-

troduction to the SQL language, while Chapter Six covers database design concepts.

Chapter Seven covers the basics of the C API. Chapter Eight builds on that to cover

more advanced topics, such as storing times and dates, using SQLite from scripting

languages, and utilizing some of the more advanced extensions. Chapters Nine and

Ten cover writing your own custom SQL functions, extensions, and modules.

To complete the picture, the ten chapters are followed by several reference appendixes.

These references cover all of the SQL commands, expressions, and built-in functions

supported by SQLite, as well as documentation for the complete SQLite API.

SQLite Versions

The first edition of this book coves SQLite version 3.6.23.1. As this goes to press, work

on SQLite version 3.7 is being finalized. SQLite 3.7 introduces a new transaction journal

mode known as Write Ahead Logging, or WAL. In some environments, WAL can pro-

vide better concurrent transaction performance than the current rollback journal. This

performance comes at a cost, however. WAL has more restrictive operational require-

ments and requires more advanced support from the operating system.

Once WAL has been fully tested and released, look for an article on the O’Reilly website

that covers this new feature and how to get the most out of it.

Email Lists

The SQLite project maintains three mailing lists. If you’re trying to learn more about

SQLite, or have any questions that are not addressed in this book or in the project

documentation, these are often a good place to start.

sqlite-announce@sqlite.org

This list is limited to announcements of new releases, critical bug alerts, and other

significant events in the SQLite community. Traffic is extremely low, and most

messages are posted by the SQLite development team.

sqlite-users@sqlite.org

This is the main support list for SQLite. It covers a broad range of topics, including

SQL questions, programming questions, and questions about how the library

works. This list is moderately busy.

sqlite-dev@sqlite.org

This list is for people working on the internal code of the SQLite library itself. If

you have questions about how to use the published SQLite API, those questions

belong on the sqlite-users list. Traffic on this list is fairly low.

You can find instructions on how to join these mailing lists on the SQLite website. Visit

http://www.sqlite.org/support.html for more details.

The sqlite-users@sqlite.org email list can be quite helpful, but it is a moderately busy

list. If you’re only a casual user and don’t wish to receive that much email, you can also

access and search list messages through a web archive. Links to several different

archives are available on the SQLite support page.

Example Code Download

The code examples found in this book are available for download from the O’Reilly

website. You can find a link to the examples on the book’s catalog page at http://oreilly

.com/catalog/9780596521196/. The files include both the SQL examples and the C

examples found in later chapters.

xvi | Preface

How We Got Here

Taking a book from an idea to a finished product involves a great many people. Al-

though my name is on the cover, this could not have been possible without all of their

help.

First, I would like to acknowledge the friendship and support of my primary editor,

Mike Loukides. Thanks to some mutual friends, I first started doing technical reviews

for Mike over eight years ago. Through the years, Mike gently encouraged me to take

on my own project.

The first step on that path came nearly three years ago. I had downloaded a set of

database exports from the Wikipedia project and was trying to devise a minimal data-

base configuration that would (hopefully) cram nearly all the current data onto a small

flash storage card. The end goal was to provide a local copy of the Wikipedia articles

on an ebook reader I had. SQLite was a natural choice. At some point, frustrated with

trying to understand the correct call sequence, I threw my hands up and exclaimed,

“Someone should write a book about this!”—Ding!—The proverbial light bulb went

off, and many, many (many…) late nights later, here we are.

Behind Mike stands the whole staff of O’Reilly Media. Everyone I interacted with did

their best to help me out, calm me down, and fix my problems—sometimes all at once.

The production staff understands how to make life easy for the author, so that we can

focus on writing and leave the details to someone else.

I would like to thank D. Richard Hipp, the creator and lead maintainer of SQLite. In

addition to coordinating the continued development of SQLite and providing us all

with a high-quality software product, he was also gracious enough to answer numerous

questions, as well as review a final draft of the manuscript. Some tricky spots went

through several revisions, and he was always quick to review things and get back to me

with additional comments.

A technical review was also done by Jon W. Marks. Jon is an old personal and profes-

sional friend with enterprise-class database experience. He has had the opportunity to

mentor several experienced developers as they made their first journey into the rela-

tional database world. Jon provided very insightful feedback, and was able to pinpoint

areas that are often difficult for beginners to grasp.

My final two technical reviewers were Jordan Hawker and Erin Moy. Although they

are knowledgeable developers, they were relatively new to relational databases. As they

went through the learning process, they kept me honest when I started to make too

many assumptions, and kept me on track when I started to skip ahead too quickly.

Preface | xvii

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