How do I handle transactions in Node.js using Knex?

How do I handle transactions in Node.js using Knex?

To handle transactions in Knex, you can use the transaction method. Here's a basic example:

const knex = require('knex')({ client: 'pg' });

async function runTransaction() {
  const trx = await knex.transaction();
  try {
    await trx('table1').insert({ column: 'value' });
    await trx('table2').insert({ column: 'value' });
    await trx.commit();
  } catch (error) {
    await trx.rollback();
    console.error('Transaction failed:', error);
  }
}

This ensures that both inserts are treated as a single transaction.

What happens if one of the queries fails?

If one of the queries fails, the transaction will be rolled back, meaning none of the changes will be saved to the database. This ensures data integrity.

Can I nest transactions in Knex?

Yes, you can nest transactions in Knex, but you need to manage them carefully. Each nested transaction can be committed or rolled back independently.

Are there any performance considerations I should be aware of?

Yes, transactions can lock rows in the database, which may lead to performance issues if not managed properly. It's best to keep transactions short and only include necessary queries.