Simple express no blocking test

express-mysql.js

var app = require('express').createServer();
var Client = require('mysql').Client,
    db = new Client();

db.user = 'root';
db.password = '';

db.connect();


app.get('/', function(req, res){
   console.log("Request to /");
   db.query('SELECT RAND() AS s', function(err, results) {
      var r_size = Math.round(results[0].s*10);
      var i = 0;
      for(i=r_size;i>=0;i--)
      {  console.log("Set: "+i);
         db.query('SELECT SLEEP(1)', function(err, results) {
               r_size--;
               console.log("R_size: "+r_size);
               if(r_size == 0)
               { console.log("Sending...");
                  res.send('Hello!');
               }
         });
		 console.log("Set: "+ i +" | No Block");
      }
   });

   console.log("Request to / | No Block");
});

app.get('/ping', function(req, res){
   console.log("Request to /ping");
   res.send('pong');
   console.log("Request to /ping | No Block");
});

app.listen(7070);