node-pgquery.js

var query = require('pg-query');
query.connectionParameters = 'postgres://postgres:[email protected]:5432/fba_db';
var i=10;
//accepts optional array of values as 2nd parameter for parameterized queries 
var promise;

q();


function onSuccess(rows, result) {
  i--;
  console.log(rows[0].cname);
  if(i>=0)  q();
}
function onError(error) {
  console.log('ERROR');
}

function q(){
    var sql = (i%2==0)? "select * from class limit 1":"select * from object limit 1";
    promise = query(sql);
    promise.spread(onSuccess, onError);
}