Book Image

Amazon SimpleDB Developer Guide

Book Image

Amazon SimpleDB Developer Guide

Overview of this book

SimpleDB is a highly scalable, simple-to-use, and inexpensive database in the cloud from Amazon Web Services. But in order to use SimpleDB, you really have to change your mindset. This isn't a traditional relational database; in fact it's not relational at all. For developers who have experience working with relational databases, this may lead to misconceptions as to how SimpleDB works.This practical book aims to address your preconceptions on how SimpleDB will work for you. You will be quickly led through the differences between relational databases and SimpleDB, and the implications of using SimpleDB. Throughout this book, there is an emphasis on demonstrating key concepts with practical examples for Java, PHP, and Python developers.You will be introduced to this massively scalable schema-less key-value data store: what it is, how it works, and why it is such a game-changer. You will then explore the basic functionality offered by SimpleDB including querying, code samples, and a lot more. This book will help you deploy services outside the Amazon cloud and access them from any web host.You will see how SimpleDB gives you the freedom to focus on application development. As you work through this book you will be able to optimize the performance of your applications using parallel operations, caching with memcache, asynchronous operations, and more.
Table of Contents (16 chapters)
Amazon SimpleDB Developer Guide
About the Authors
About the Reviewers

Storing Boolean values

Booleans are very commonly used for storing binary values. You can either choose to store them as a simple 0 or 1 in SimpleDB or store them in a slightly more readable way as the string values true and false.

Storing Boolean values with Java

Here are two simple methods to convert values from a Boolean to a string and vice versa:

  • public String encodeBoolean(boolean valueToEncode) { return new Boolean(valueToEncode).toString(); }

  • public boolean decodeBoolean(String encodedValue) { return encodedValue.equalsIgnoreCase("true"); }

Storing Boolean values with PHP

These functions are in the SimpleDB PHP library. Boolean true is stored as the string true while false is stored as the string false. The following functions isolate the program from the stored value so that as an example 1 and 0 could be used for true and false instead:

public function encodeBoolean($input) {
if ($input) {
return "true";
} else {
return "false";
public function decodeBoolean($input) {
if (strtolower...