JAVASCRIPT

node js postgresql query

// callback
client.query('SELECT NOW() as now', (err, res) => {
  if (err) {
    console.log(err.stack)
  } else {
    console.log(res.rows[0])
  }
})
// promise
client
  .query('SELECT NOW() as now')
  .then(res => console.log(res.rows[0]))
  .catch(e => console.error(e.stack))

postgresql nodejs

const { Client } = require('pg')const client = new Client();(async () => {  await client.connect()  const res = await client.query('SELECT $1::text as message', ['Hello world!'])  console.log(res.rows[0].message) // Hello world!  await client.end()})()