var mysql = require('mysql');

function createDBConnection() {
    var conn = mysql.createPool({
      host: 'xxx',
      user: 'xxx',
      password: 'xxx',
      database: 'xxx'
    });
    return conn;
}

module.exports = function() {
  return createDBConnection;
}

function Dao(connection) {
  this._connection = connection;
}

Dao.prototype.findAll = function (callback) {
  this._connection.query('SELECT * FROM table',
  function(errors, results) {
    callback(errors,results);
  });
};

module.exports = function() {
  return Dao;
}

app.get('/products', function (req,res) {
    var connection = app.persistence.connectionFactory();
    var dao = new app.persistence.Dao(connection);

    dao.findAll(function (err, result) {
      res.format({
        json: function () {
          res.json(result);
        }
      });
    });
  });