How to store image into a MySQL database using node.js and Javascript

I am developing web application using node.js. I want to store an image into MySQL database.Please give some suggestions.

var Client = require('mysql').Client,
    client = new Client();
client.user = DB_USER;
client.password = DB_PASS;
client.host = DB_HOST;
client.connect(function(error, results) {
    if(error) {
        client.end();
        return;
    }
    client.query('USE ' + DB_SCHEME, function(error, results) {
        if(error) {
            client.end();
            return;
        }

        var sql = "INSERT INTO b SET `data` = ?";
        var values = [buf];

        client.query(sql, values,
            function(error, results) {
                if(error) {
                    return;
                }
                return;
            }
        );
    });
});

Here data is blob type.