Transactions and rollback in mongodb with an example

const MongoClient = require('mongodb').MongoClient;
const url = 'mongodb://localhost:27017';
const dbName = 'mydb';
const client = new MongoClient(url, { useUnifiedTopology: true });

// Connect to MongoDB
client.connect(function(err) {
  if (err) throw err;

  const db = client.db(dbName);
  const collection1 = db.collection('collection1');
  const collection2 = db.collection('collection2');

  const session = client.startSession();

  // Start a transaction
  session.startTransaction();

  try {
    // Perform multiple operations as a single transaction
    collection1.insertOne({ name: 'John' }, { session });
    collection2.insertOne({ name: 'Jane' }, { session });

    // Commit the transaction
    session.commitTransaction(function(err) {
      if (err) throw err;
      console.log('Transaction committed successfully.');
      client.close();
    });
  } catch (error) {
    // Roll back the transaction if any operation fails
    session.abortTransaction(function(err) {
      if (err) throw err;
      console.log('Transaction aborted.');
      client.close();
    });
  }
});