How can I implement transaction management in my backend application?

How can I implement transaction management in my backend application?

To implement transaction management, you can use database transactions to ensure data integrity. Are you using a specific database?

Yes, I'm using PostgreSQL. What are the steps to set up transactions?

In PostgreSQL, you can use the BEGIN, COMMIT, and ROLLBACK commands. Start a transaction with BEGIN, execute your queries, and then either COMMIT to save changes or ROLLBACK to undo them.

Can you give me an example of how to use these commands in code?

Sure! In a Node.js application using the pg library, you can do something like this:

const { Client } = require('pg');
const client = new Client();

async function runTransaction() {
  await client.connect();
  try {
    await client.query('BEGIN');
    await client.query('INSERT INTO users(name) VALUES($1)', ['Alice']);
    await client.query('INSERT INTO orders(user_id) VALUES($1)', [1]);
    await client.query('COMMIT');
  } catch (e) {
    await client.query('ROLLBACK');
    throw e;
  } finally {
    await client.end();
  }
}

What happens if an error occurs during the transaction?

If an error occurs, the ROLLBACK command will undo all changes made during the transaction, ensuring data consistency.