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Transaction In MongoDB

In this article, we will discuss the transactions in MongoDB.

Purpose

Transactions in MongoDB allow multiple read and write operations to be executed atomically across numerous documents, collections, and databases, ensuring data consistency.

Creating A Cluster In Mongodb Atlas

To create the cluster, go to MongoDB Atlas. Click on the + Create button.

Picture showing +Create button for creating a new cluster

A popup window will appear to specify the cloud configuration.

Another screen will appear to deploy the cluster.

Picture showing the screen to deploy the cluster

Enter the details and click on the Create Deployment button. A window will appear where username and password will be generated.

Add An Admin Access User In Cluster

To add a user of Admin Access permission, go to Security → Database Access. The following screen will appear.

Picture showing Add New Database user for adding the admin access to the user

Click on the Add New Database User button. A popup window will appear to specify the user and the permission.

Picture showing adding the admin access to the user

Click on the Add User to provide permission to the user.

Connect To The Cluster

To connect to the cluster, open the MongoDB command shell and write the following command: -

mongosh "mongodb+srv://[cluster_name].vyoy2.mongodb.net/" --apiVersion 1 --username [username]

Transaction

In this example, we will write 2 insert statements. For that, we will write the following queries: -

const session = db.getMongo().startSession();
session.startTransaction();
const db = session.getDatabase("test");	
db.users.insertOne({ name: "user1" });
db.users.insertOne({ name: "user2" });
session.commitTransaction();
session.endSession();

To Abort the transaction, we will write the following query: -

session.abortTransaction();

Posted By -	Karan Gupta

Posted On -	Thursday, August 29, 2024

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