transactions.mdx

title
Transactions

import { Alert } from '/components/alert.tsx'

To execute a transaction with node-postgres you simply execute BEGIN / COMMIT / ROLLBACK queries yourself through a client. Because node-postgres strives to be low level and un-opinionated, it doesn't provide any higher level abstractions specifically around transactions.

You must use the same client instance for all statements within a transaction. PostgreSQL isolates a transaction to individual clients. This means if you initialize or use transactions with the{' '} pool.query method you will have problems. Do not use transactions with the pool.query method.

Examples

import pg from 'pg'
const { Pool } = pg
const pool = new Pool()

const client = await pool.connect()

try {
  await client.query('BEGIN')
  const queryText = 'INSERT INTO users(name) VALUES($1) RETURNING id'
  const res = await client.query(queryText, ['brianc'])

  const insertPhotoText = 'INSERT INTO photos(user_id, photo_url) VALUES ($1, $2)'
  const insertPhotoValues = [res.rows[0].id, 's3.bucket.foo']
  await client.query(insertPhotoText, insertPhotoValues)
  await client.query('COMMIT')
} catch (e) {
  await client.query('ROLLBACK')
  throw e
} finally {
  client.release()
}