Book Image

MongoDB 4 Quick Start Guide

By : Doug Bierer
Book Image

MongoDB 4 Quick Start Guide

By: Doug Bierer

Overview of this book

MongoDB has grown to become the de facto NoSQL database with millions of users, from small start-ups to Fortune 500 companies. It can solve problems that are considered difficult, if not impossible, for aging RDBMS technologies. Written for version 4 of MongoDB, this book is the easiest way to get started with MongoDB. You will start by getting a MongoDB installation up and running in a safe and secure manner. You will learn how to perform mission-critical create, read, update, and delete operations, and set up database security. You will also learn about advanced features of MongoDB such as the aggregation pipeline, replication, and sharding. You will learn how to build a simple web application that uses MongoDB to respond to AJAX queries, and see how to make use of the MongoDB programming language driver for PHP. The examples incorporate new features available in MongoDB version 4 where appropriate.
Table of Contents (11 chapters)

Performing simple queries

Command summary (discussed as follows):

  • db.<collection>.find({<filter>},{<projection>}).<aggregation>(): Returns only one or more documents based on the filter expression. The projection expression includes or excludes document fields. Aggregation is used to manipulate the final result set (for example, sort(), limit(), and so on).
  • db.<collection>.findOne({<filter>},{<projection>}): Returns only one document based on the filter expression. The projection expression includes or excludes document fields.

One of the most common operations on any database is querying the database for information, which will then form the basis of reports and information that might appear on a web page. In MongoDB the primary command to perform a query is db.<collection>.find(). There is also a variation db.<collection...