MongoDB Data Types (Day 5)

Introduction

Before reading this article, I highly recommend reading the previous installments in the series:

Internally, MongoDB stores JSON documents in a binary-encoded format called BSON. BSON extends the JSON model to provide additional data types and to be efficient for encoding and decoding within various languages. It adds support for data types, such as date and binary, which aren't supported in JSON. BSON is a binary serialization format for storing documents and to make Remote Procedure Calls in MongoDB.

MongoDB supports the following data types. Each data type has a corresponding number. The $type method identifies a data type using its corresponding number.

Now, we will learn some basic data types with examples. Double

The Double data type stores floating-point values. Example In the above example, we created a variable (double_) of the floating type, inserted a float type value into this variable, and finally printed the value of this variable. String

String is the most commonly used data type. It contains a string of text or any other type of character. BSON strings are UTF-8. In general, drivers for each programming language convert from the language string format to UTF-8 when serializing and deserializing BSON. If a string is not valid, it will not be saved. This makes it possible to store most international characters in BSON strings. Example Object

This data type stores embedded documents. When a document contains another document in the form of key-value pair then such type of document is known as an embedded document. Example Array

The Array data type stores arrays. An Array type can store multiple values of multiple data types (Integer, Double, Date, String, and so on). Example Binary Data

The Binary data type stores binary data. Example In the preceding example, BinData is the base64 representation of a binary string. ObjectId The ObjectId data type stores the document's ID. ObjectId is small, likely unique, fast to generate, and ordered. The size of ObjectId is 12 bytes. These 12 bytes are divided into the following 4 parts.