node.js url shortener

/**********************
 * ./init.js
 **********************/

require('./Lib/MooTools').apply(GLOBAL);

var http  = require('http');
http.ServerResponse.implement({
    header : function (code, plain) {
        this.writeHead(code, {
            'Content-Type': plain ? 'text/plain' : 'text/html'
        });
    },
    redirect : function (url, status) {
        this.writeHead(status || 302, {
            'Content-Type' : 'text/plain',
            'Location'     : url
        });
        this.write('Redirecting to ' + url);
        this.end();
    }
});

var conn = require('./Lib/mysql/mysql-libmysqlclient').createConnectionSync();
conn.connectSync('localhost', 'NAME', 'PASS', 'nodejs');

var linkModel = new (require('./Link').Model)(conn);
var renderer  = new (require('./Renderer').Renderer)(linkModel);

http.createServer(function (req, res) {
    renderer.run(req, res);
}).listen(8124, "127.0.0.1");
console.log('Server running at http://127.0.0.1:8124/');

/**********************
 * ./Link.js
 **********************/
require('./Lib/MooTools').apply(GLOBAL);

Link = new Class({
    initialize : function (obj) {
        this.setId(obj.id).id || this.setCode(obj.code);
        this.setUrl(obj.url);
    },
    setId : function (id) {
        this.id = (isNaN(id) || id <= 0) ? null : parseInt(id);
        return this;
    },
    getId : function () {
        return this.id;
    },
    setUrl : function (url) {
        this.url = url || null;
        return this;
    },
    getUrl : function () {
        return this.url;
    },
    setCode : function (code) {
        this.id = Link.fromCode(code);
        return this;
    },
    getCode : function () {
        return Link.getCode(this.id);
    },

});

Link.getCode  = function (id) {
    return id ? id.toString(36) : null;
};

Link.fromCode = function (code) {
    return code ? parseInt(code, 36) : null;
};

Model = new Class({
    conn : null,
    initialize : function (conn) {
        this.conn = conn;
    },
    create : function (args) {
        return new Link(args);
    },
    get : function (link, fn) {
        if (!link.getId()) throw 'EmptyId';

        var q = 'SELECT * FROM `shortLinks` WHERE `id` = ' + link.getId();

        this.conn.query(q, function (err, res) {
            if (err) throw err;

            res.fetchAll(function (err, rows) {
                if (err) throw err;

                fn(rows.length ? link.setUrl(rows[0].url) : null);

                res.freeSync();
            });
        });
    },
    put : function (link, fn) {
        var q = 'INSERT INTO `shortLinks` (`id`, `url`) ' +
            'VALUES (NULL , "' + this.conn.escapeSync(link.getUrl()) + '");'

        this.conn.query(q, function (err, res) {
            if (err) throw err;

            fn(link.setId(
                this.conn.lastInsertIdSync()
            ));
        }.bind(this));
    }
});

exports.Link  = Link;
exports.Model = Model;

/**********************
 * ./Renderer.js
 **********************/

require('./Lib/MooTools').apply(GLOBAL);

var url = require('url');
var fs  = require('fs');

exports.Renderer = new Class({
    initialize : function (linkModel) {
        this.link = linkModel;
    },

    run : function (req, res) {
        var path = url.parse(req.url, true);
        if (path.query && 'add' in path.query) {
            var addUrl = path.query.add;
            if (!url.parse(addUrl).protocol) {
                addUrl = 'http://' + addUrl;
            }
            this.add(res, addUrl);
        } else if (path.pathname.test(/^\/![0-9a-z]+$/)) {
            this.send(res, path.pathname.substr(2));
        } else {
            this.index(res);
        }
    },

    add : function (res, url) {
        res.header(200);
        this.link.put(
            this.link.create({ url : url }),
            function (link) {
                res.end(link.getCode());
            }
        );
    },
    send : function (res, code) {
        this.link.get(
            this.link.create({ code : code }),
            function (link) {
                if (link) {
                    res.redirect(link.getUrl());
                } else {
                    res.header(404, true);
                    res.end('There is not such url');
                }
            }
        );
    },
    index : function (res) {
        fs.readFile(__dirname + '/index.html', function (err, data) {
            if (err) throw err;
            res.header(200);
            res.end(data);
        })
    }
});

/**********************
 * ./index.html
 **********************/
<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>Сокращатель ссылок на node.js</title>
        <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script>
        <script>
$(function () {
    $('input[type=submit]').click(function() {
        var input = $('input[type=text]');
        var url   = input.val();
        input.val('');
        url && $.ajax({
            url : './',
            data: ({ add : url }),
            success : function (data) {
var result = location.protocol + '//' + location.host + '/!' + data;
$('#url')
    .prepend(
        $('<dd>').append(
            $('<a>')
                .text(result)
                .attr('href', result)
        )
        .hide()
        .fadeIn()
    )
    .prepend(
        $('<dt>')
            .text(url)
            .hide()
            .fadeIn()
    );
            }  // success function
        }); // ajax object
    }); // $('input[type=submit]').click
}); // document.ready
        </script>
    </head>
    <body>
        <div id="form">
            <input type="text"   />
            <input type="submit" />
        </div>
        <dl id="url"></dl>
    </body>
</html>