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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)
Free Chapter
Amazon SimpleDB Developer Guide
About the Authors
About the Reviewers

Storing date values

Date values are much more difficult to compare lexicographically, as the formats are so different and there is no guarantee that the significant units will be in the right position in the date string. It is possible to store the date as the number of epoch seconds since January 1, 1970. This will work but is a bit cumbersome, as the stored number is not at all readable and you will need to convert it to another meaningful date format to make any sense of it.


A better solution is to use a date format that is friendly to a lexicographical comparison—ISO8601.

ISO8601 is a format that is also being used by some of the Amazon Web Services. It is an international standard for representing date formats in an unambiguous way while making comparisons between two dates simpler. The date and time values are organized from the most to the least significant components: year, month (or week), day, hour, minute, second, and fraction of second. The time representation possesses a...

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