LevelDB入门指南：iOS与OSX上的键值数据存储

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"Getting Started with LevelDB - Andy Dent 是一本由Andy Dent编写的书籍，旨在帮助读者通过实际案例深入理解和学习LevelDB，特别是在iOS和OSX平台上快速存储和检索键值对数据。" LevelDB是Google开发的一个轻量级、高性能的键值存储系统，适用于嵌入式应用和作为其他应用程序的基础数据存储。本书"Getting Started with LevelDB"提供了入门级的指导，适合开发者和有兴趣了解NoSQL数据库解决方案的人群。在书中，作者Andy Dent会介绍LevelDB的基本概念，包括其设计原则、核心功能和操作机制。LevelDB的核心特性包括： 1. **键值对存储**：LevelDB支持将任意字节序列作为键和值进行存储，这使得它可以用于存储各种类型的数据。 2. **排序键**：LevelDB按字典顺序对键进行排序，这使得基于键范围的查询变得高效。 3. **数据版本控制**：LevelDB支持多版本并发控制（MVCC），允许多个读写操作并行进行，提高了系统的并发性能。 4. **压缩**：为了节省存储空间，LevelDB内置了数据压缩功能，可以在不影响性能的前提下降低存储需求。 5. **故障恢复**：LevelDB通过日志和检查点机制确保数据的持久性和一致性，即使在系统崩溃后也能恢复数据。 6. **简单的API**：LevelDB提供了简单的C++接口，易于集成到各种语言中，例如Python、Java、Go等。书中可能会通过一系列逐步教程和实践项目，演示如何在iOS和OSX应用中集成LevelDB，如何创建数据库、插入和读取数据，以及如何处理并发和数据备份。此外，作者可能还会讨论性能调优、错误处理和故障排查等实际开发中遇到的问题。虽然LevelDB在很多方面表现出色，但也有其局限性，比如不支持复杂的查询语法、不提供分布式集群解决方案等。因此，读者可能需要结合其他工具或框架来应对更复杂的应用场景。 "Getting Started with LevelDB"是一本有价值的资源，对于想要在移动设备或桌面系统上实现高效、可靠的数据存储的开发者来说，这本书将是一个很好的起点。通过阅读此书，读者不仅可以学习到LevelDB的基本用法，还能掌握如何在实际项目中应用这些知识。

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Preface

LevelDB is both the simplest and potentially most powerful database technology

available across platforms and suitable for mobile use. This book teaches you all

about LevelDB using iOS and OS X examples.

If you need to store data in a persistent dictionary, build complex data structures that

are hard to model in SQL, or just push performance boundaries, LevelDB provides the

building blocks. To get beyond the basics, you need to understand the programming

patterns that allow for more complex data modeling in a key-value store.

This book provides the understanding and coding tools to get the most out of

LevelDB. The principles it teaches can also be applied to other sorted key-value

stores. The book is suited for programmers, but includes enough theory to be

interesting for a DBA or software architect.

What this book covers

Chapter 1, Downloading LevelDB and Building with OS X, goes in detail through the

downloading and building of the open-source LevelDB including dealing with

Unix idioms. It includes building a trivial OS X application to prove the database

is working.

Chapter 2, Installing LevelDB and Building for iOS, repeats the library building process

to get a LevelDB library for use in the simulator and on iOS devices. It includes

building a trivial iOS application to prove the database is working.

Chapter 3, Basic Key-value Operations – Creating and Deleting Data, teaches you a little

C++ as you learn how to store, retrieve, and delete data in a LevelDB database.

Chapter 4, Iteration and Searching Keys, goes beyond reading exact keys to show you

how to efciently iterate through all or part of the database, in order. It introduces

the concept of storing key values to refer to other records.

Preface

[ 2 ]

Chapter 5, Using Objective-C, introduces the three main Objective-C wrappers released

for LevelDB and compares their use with each other as well as the traditional C++

API used in previous chapters.

Chapter 6, Integrating with a Cocoa UI, shows how a typical form-based application

can have lists of records loaded from a database and maps text entry elds to store a

database record using simple JSON arrays.

Chapter 7, Debugging with REPLs and Command Lines, provides some debugging tools

to help inspect your database. It includes a general purpose web server library that

can be integrated into any iOS application to provide a debugging interface.

Chapter 8, Richer Keys and Data Structures, expands our simple GUI example with

full record editing and different list sorting. It builds upon that example with a

discussion of key design compared to SQL and custom key comparators.

Chapter 9, A Document Database, builds a different example program to show

schema design using an extension of the APLevelDB Objective-C wrapper. It also

covers how the LevelDB folder can be treated as a single package to appear as one

item in the nder.

Chapter 10, Tuning and Key Policies, presents the basics of LevelDB's implementation

as a foundation for discussing how to tune it for your application needs.

Appendix, Scripting Languages, takes a quick look at using LevelDB from Node.js,

Python, and Ruby scripting languages.

What you need for this book

To build the samples in this book you need a current version of Apple's Xcode

compiler. The remaining downloading of open source is described as needed per

chapter. To test sample programs on iOS devices you will need to be a paid member

of the Apple Developer program.

Who this book is for

This book is primarily for programmers who need a exible database engine that

is easy to start with but capable of scaling to hundreds of millions of entries. It will

be of interest to database designers, architects, and technical managers who want to

learn more detail about sorted key-value stores.

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