mongodbHow to use transactions in MongoDB?

MongoDB transactions provide atomicity, consistency, isolation, and durability (ACID) guarantees for operations within a single document. Transactions allow developers to execute multiple operations in a single atomic operation, either all of the operations will succeed or none of them will.

Example code

// Start a session
const session = db.startSession();

// Start a transaction
session.startTransaction();

// Insert a document
db.collection.insertOne({
  _id: 1,
  name: 'John Doe'
}, { session });

// Update a document
db.collection.updateOne({
  _id: 1
}, {
  $set: {
    name: 'Jane Doe'
  }
}, { session });

// Commit the transaction
session.commitTransaction();

// End the session
session.endSession();

Output example

WriteResult({ "nInserted" : 1 })

Code explanation

1. const session = db.startSession(); - This line starts a session.

2. session.startTransaction(); - This line starts a transaction.

3. db.collection.insertOne({ _id: 1, name: 'John Doe' }, { session }); - This line inserts a document with the given data.

4. db.collection.updateOne({ _id: 1 }, { $set: { name: 'Jane Doe' } }, { session }); - This line updates the document with the given data.

5. session.commitTransaction(); - This line commits the transaction.

6. session.endSession(); - This line ends the session.

Helpful links

• MongoDB Transactions
• MongoDB Node.js Driver Transactions

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