MongoDB Server

MongoDB Server

Introduction

MongoDB is a popular NoSQL database system that stores data in a JSON-like format called BSON (Binary JSON). MongoDB Server is the core component of MongoDB, responsible for managing data storage, retrieval, and processing. In this documentation, we will cover the installation, basic usage, and code examples for working with MongoDB Server.

Installation

MongoDB Server can be installed on various operating systems. Here, we'll provide installation instructions for Ubuntu Linux:

1. Add the MongoDB repository:

bash
$ wget -qO - https://www.mongodb.org/static/pgp/server-4.4.asc | sudo apt-key add -
$ echo "deb [ arch=amd64,arm64 ] https://repo.mongodb.org/apt/ubuntu $(lsb_release -cs)/mongodb-org/4.4 multiverse" | sudo tee /etc/apt/sources.list.d/mongodb-org-4.4.list
$ sudo apt-get update

2. Install MongoDB Server:

bash
$ sudo apt-get install -y mongodb-org

3. Start and enable MongoDB:

bash
$ sudo systemctl start mongod
$ sudo systemctl enable mongod

Basic Usage

MongoDB Server can be interacted with using its official shell, which is a JavaScript-based interface. Here are some common commands:

1. Connect to MongoDB Shell

bash
$ mongo

2. Show Databases

javascript
> show dbs

3. Switch/Use a Database

javascript
> use mydatabase

4. Create a Collection

javascript
> db.createCollection("mycollection")

5. Insert a Document

javascript
> db.mycollection.insertOne({ name: "John Doe", age: 30, email: "john@example.com" })

6. Find Documents

javascript
> db.mycollection.find({ age: { $gt: 25 } })

7. Update Documents

javascript
> db.mycollection.updateOne({ name: "John Doe" }, { $set: { age: 31 } })

8. Delete Documents

javascript
> db.mycollection.deleteOne({ name: "John Doe" })

Explanation of Code Examples

1. We start by connecting to the MongoDB shell using the mongo command. It opens up a JavaScript-based shell to interact with the database.

2. show dbs displays all the available databases on the MongoDB server.

3. use mydatabase switches to the specified database (replace mydatabase with the desired database name).

4. db.createCollection("mycollection") creates a new collection named mycollection in the current database.

5. db.mycollection.insertOne({ name: "John Doe", age: 30, email: "john@example.com" }) inserts a document into the mycollection collection.

6. db.mycollection.find({ age: { $gt: 25 } }) searches and retrieves documents from the collection where the age is greater than 25.

7. db.mycollection.updateOne({ name: "John Doe" }, { $set: { age: 31 } }) updates the age of the document with the name "John Doe" to 31.

8. db.mycollection.deleteOne({ name: "John Doe" }) deletes the document with the name "John Doe" from the collection.

Remember that MongoDB offers a lot more functionalities, such as indexing, aggregation, and data replication, which are essential for real-world applications. The examples provided here are basic to give you a starting point for working with MongoDB Server.