Book Image

Learn MongoDB 4.x

By : Doug Bierer
Book Image

Learn MongoDB 4.x

By: Doug Bierer

Overview of this book

When it comes to managing a high volume of unstructured and non-relational datasets, MongoDB is the defacto database management system (DBMS) for DBAs and data architects. This updated book includes the latest release and covers every feature in MongoDB 4.x, while helping you get hands-on with building a MongoDB database app. You’ll get to grips with MongoDB 4.x concepts such as indexes, database design, data modeling, authentication, and aggregation. As you progress, you’ll cover tasks such as performing routine operations when developing a dynamic database-driven website. Using examples, you’ll learn how to work with queries and regular database operations. The book will not only guide you through design and implementation, but also help you monitor operations to achieve optimal performance and secure your MongoDB database systems. You’ll also be introduced to advanced techniques such as aggregation, map-reduce, complex queries, and generating ad hoc financial reports on the fly. Later, the book shows you how to work with multiple collections as well as embedded arrays and documents, before finally exploring key topics such as replication, sharding, and security using practical examples. By the end of this book, you’ll be well-versed with MongoDB 4.x and be able to perform development and administrative tasks associated with this NoSQL database.
Table of Contents (22 chapters)
1
Section 1: Essentials
5
Section 2: Building a Database-Driven Web Application
9
Section 3: Digging Deeper
13
Section 4: Replication, Sharding, and Security in a Financial Environment
14
Working with Complex Documents Across Collections

Serving binary data directly from MongoDB

When browsing through the sample data for products, you might have noticed a field, productPhoto, with an exceptionally large amount of seemingly gibberish data. Here is a screenshot from the first product in the collection showing part of the first lines of data for this field:

This data represents Base64-encoded binary data, which, when decoded, is a photo of the product. In this section, we will show you how to cause a web script to display the product photo directly out of the database.

It is important to note that the technique described in this section has advantages and disadvantages over just uploading the photos directly to the images folder of your website's document root. The disadvantage is that this technique produces a larger HTML page, and the photo doesn't render as fast. The advantage is that you have more control over the photos as the database can be secured, and the only way an attacker can access the photo...