Closing Postgres (pg) Client Connection In Node.js

I have a script that I want to run on a scheduled basis in node. The script is not terminating and exiting. I suspect that this is because my database client is still open. var cli

Solution 1:

A promise-based interface like pg-promise is the way to go:

var bluebird = require('bluebird');
var pgp = require('pg-promise')({
    promiseLib: bluebird
});
var db = pgp(/*connection details*/);

db.tx(t => {
    // BEGIN executedreturn t.map('SELECT id, chain FROM mytable where state_ready = $1 and transaction_id = $2', [true, 123], a => {
        var chain = data.chain;
        var pg_record = data.id;
        return t.none('UPDATE mytable SET transaction_id = $1::text where id=$2::int', [transactionHash, pg_record]);
    }).then(t.batch); // settling all internal queries
})
    .then(data => {
        // success, COMMIT executed
    })
    .catch(error => {
        // error, ROLLBACK executed
    })
    .finally(pgp.end); // shuts down the connection pool

The example above does exactly what you asked for, plus it uses a transaction. But in reality you're gonna want to do it all in one query, for performance reasons ;)

See more examples.