gistfile1.txt

var price  = -1;  
var userId = 'some user provided value';  
var sql    = 'SELECT max(price) FROM users WHERE id = ' + connection.escape(userId);  

server = http.createServer(function (request, response) {  
  handler(request);   //response depend on price
});

connection.query(sql, function(err, results) {  
  price = results.price;
  server.listen(8012); 
});