NodeJS: if I return mysql data to client in the end of request does it mean that having callbacks doesn't make sense?

Question

NodeJS: if I return mysql data to client in the end of request does it mean that having callbacks doesn't make sense?

I'm new to Node.
I need to query Mysql and return that data to client synchronously.
If I do so does it mean that I block Reactor even if I use evented Mysql lib? How should I do it correctly?

node.js

Answer 1

I think that fake example will answer your question :

var http = require('http');
var db = require('db');

http.createServer(function (req, res) {

    db.query('fake query', function(data){
        res.send(data);
    }

}).listen(1337, '127.0.0.1');

Even if you don't send your response syncronously, it's ok, that is how node work. I struggled with that concept at first, too.