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
Credits
Foreword
About the Authors
About the Reviewers
Preface

Storing and retrieving data from memcached


It is quite simple to use the memcached client. In this section we will store and retrieve data from the memcached server and get a feel for the API.

Storing and retrieving data from memcached in Java

The first thing we need to do before retrieving data is to actually create a connection to the memcached server. A static pool of servers is used by the client. You can of course specify more than one memcached server for the pool. Once we have a connection object, it can be used for all of the interaction with the server, and for setting and retrieving keys and their associated values. Here is a simple class that shows how we would do this in Java:

package simpledbbook;
import com.danga.MemCached.MemCachedClient;
import com.danga.MemCached.SockIOPool;
import java.util.Date;
public class MemcacheClientSdbBook {
// A static pool of memcache servers for the client
static {
String[] serverList = {"localhost:11211"};
SockIOPool pool = SockIOPool.getInstance...