node-postgres initial query for clients

index.js

var pg = require('pg');
var pgStart = require('./pg-start');

function printRes(type, err, res) {
    console.log(
        'from', type, 'we got', err ? 'an ERROR' : 'a response: ',
        err || res
    )
}

pgStart(pg, 'select 666', printRes.bind(null, 'init'));

pg.connect(function(err, client, done){
	client.query('select 1', function(err, res){
		printRes('normal query', err, res);
		done();
		pg.end();
	});
});

output.txt

$ node index.js
from init we got a response:  { command: 'SELECT',
  rowCount: 1,
  oid: NaN,
  rows: [ { '?column?': 666 } ],
  fields: 
   [ { name: '?column?',
       tableID: 0,
       columnID: 0,
       dataTypeID: 23,
       dataTypeSize: 4,
       dataTypeModifier: -1,
       format: 'text' } ],
  _parsers: [ [Function] ],
  RowCtor: [Function] }
from normal query we got a response:  { command: 'SELECT',
  rowCount: 1,
  oid: NaN,
  rows: [ { '?column?': 1 } ],
  fields: 
   [ { name: '?column?',
       tableID: 0,
       columnID: 0,
       dataTypeID: 23,
       dataTypeSize: 4,
       dataTypeModifier: -1,
       format: 'text' } ],
  _parsers: [ [Function] ],
  RowCtor: [Function] }
$

pg-start.js

var util = require('util');

module.exports = function inject(pg) {
	var queryArgs = Array.prototype.slice.call(arguments).slice(1);

	var orgClient = pg.Client;

	var newClient = function(){
		orgClient.apply(this, arguments);

		this.query.apply(this, queryArgs);

		return this;
	};
	util.inherits(newClient, orgClient);

	pg.Client = pg.pools.Client = newClient;
}

Nice, thanks 😄 (Used this pattern for setting search_path).