exports.read = function(req, res) {
    req.getConnection(function(err,connection){
        connection.query('SELECT * FROM nota',[],function(err,result){
            if(err) return res.status(400).json();
            return res.status(200).json(result);
        });
    });
}

var express = require('express');
var App = express.Router();

var Notas = require('../api/notas');

App.route('/notas')
    .get(Notas.read);

module.exports = App;

...
var express = require('express');
var mysql = require('mysql');
var connection = require('express-myconnection');
var cors = require('cors');
var http = require('http');

var knex = require('knex')({
  client: 'mysql',
  connection: {
    host : 'localhost',
    user : 'root',
    password : 'mysql',
    database : 'promipdb'
  }
});
...