Book Image

Getting Started with RethinkDB

By : Gianluca Tiepolo
Book Image

Getting Started with RethinkDB

By: Gianluca Tiepolo

Overview of this book

RethinkDB is a high-performance document-oriented database with a unique set of features. This increasingly popular NoSQL database is used to develop real-time web applications and, together with Node.js, it can be used to easily deploy them to the cloud with very little difficulty. Getting Started with RethinkDB is designed to get you working with RethinkDB as quickly as possible. Starting with the installation and configuration process, you will learn how to start importing data into the database and run simple queries using the intuitive ReQL query language. After successfully running a few simple queries, you will be introduced to other topics such as clustering and sharding. You will get to know how to set up a cluster of RethinkDB nodes and spread database load across multiple machines. We will then move on to advanced queries and optimization techniques. You will discover how to work with RethinkDB from a Node.js environment and find out all about deployment techniques. Finally, we’ll finish by working on a fully-fledged example that uses the Node.js framework and advanced features such as Changefeeds to develop a real-time web application.
Table of Contents (15 chapters)
Getting Started with RethinkDB
Credits
About the Author
Acknowledgement
About the Reviewer
www.PacktPub.com
Preface
Index

Reading documents


If you've been following along with the previous examples, your database will now have a table called fake_data that contains 100 documents. Now that we've got some data in our database, let's see how we can read data from RethinkDB from a Node.js script.

We've already seen how RethinkDB provides us with the filter command to read data from the database based on a condition. In the previous chapters, you learned to use this command in the web interface to perform read queries on our datasets.

However, sometimes you may want to read all the data from a table without any filtering. To do this, you just need to select the table from which you want to read, and RethinkDB will give you a cursor to access the data. You can then use the cursor to create an array that includes all the results.

This example reads and prints all the documents from the fake_data table:

r.table("fake_data").run(conn, function(err, cursor) {
    if (err) throw err;
    cursor.toArray(function(err, results...