Book Image

Mastering RethinkDB

By : Shahid Shaikh
Book Image

Mastering RethinkDB

By: Shahid Shaikh

Overview of this book

RethinkDB has a lot of cool things to be excited about: ReQL (its readable,highly-functional syntax), cluster management, primitives for 21st century applications, and change-feeds. This book starts with a brief overview of the RethinkDB architecture and data modeling, and coverage of the advanced ReQL queries to work with JSON documents. Then, you will quickly jump to implementing these concepts in real-world scenarios, by building real-time applications on polling, data synchronization, share market, and the geospatial domain using RethinkDB and Node.js. You will also see how to tweak RethinkDB's capabilities to ensure faster data processing by exploring the sharding and replication techniques in depth. Then, we will take you through the more advanced administration tasks as well as show you the various deployment techniques using PaaS, Docker, and Compose. By the time you have finished reading this book, you would have taken your knowledge of RethinkDB to the next level, and will be able to use the concepts in RethinkDB to develop efficient, real-time applications with ease.
Table of Contents (16 chapters)
Mastering RethinkDB
Credits
About the Author
About the Reviewer
www.PacktPub.com
Preface

Executing data exploration use cases


We have imported our database our mock data into our RethinkDB instance. Now it's time to run a use case query and make use of it. But before we do so, we need to figure out one data alteration. We have made a mistake while generating mock data (on purpose actually) we have a $ sign before ctc. Hence, it becomes tough to perform salary-level queries.

Before we move ahead, we need to figure out this problem, and basically get rid of the $ sign and update the ctc value to an integer instead of a string.

In order to do this, we need to perform the following operation:

  • Traverse through each document in the database

  • Split the ctc string into two parts, containing $ and the other value

  • Update the ctc value in the document with a new data type and value

Since we require the chaining of queries, I have written a small snippet in Node.js to achieve the previous scenario as follows:

var rethinkdb = require('rethinkdb'); 
var connection = null; 
rethinkdb.connect...