gistfile1.js

// node_server.js

var db = requre('./db');

app.get('/getTest', function(request, response) {
  var testId = 1;
  db.getTest(testId, function (err, data) {
    // I don't actually know how to send data using express.
    response.pumpThatShitOut(data);
  });
}



// db.js
var pg = require('pg').native
var db = pg.Client("postgres:///db_name");

exports.getTest = function(testId, callback) {
  db.query("select * from table;", function (err, data) {
    if (err) {
      callback(err)
    } else {
      callback(null, doSomeShitWithData(data));
    }
  });
}