如何将端口80上的node.js localhost与端口90上的apache mysql连接？

I'm trying to access a mysql database using node.js. I simply run the following command in cmd prompt:

C:est-server> node bin/www

and it displays this message:

Express server listening in port 80

and I've the .js file as follows which the localhost access at port 80:

var express = require('express');
var router = express.Router();
var async = require('async');

var util = require('../utils/util');
var db = require('../utils/database');
var connection = db.connection();

router.get('/login', function (req, res) {
  if (req.session.manager) {
    return res.redirect('/');
  }

  if (req.query.tip == 'error') {
    var tip = 'username or password incorrect!';
  } else {
    var tip = null;
  }
  res.render('login', { tip: tip });
});

router.post('/login', function (req, res) {
  var username = req.body.username;
  var password = req.body.password;
  var sql = 'SELECT * FROM restaurant_accounts WHERE ra_name=?';
  connection.query(sql, [username], function (err, result) {
    if (err) throw err;
    if (result.length == 0) {
      return res.redirect('/manager/login?tip=error');
    } 
    var account = result[0];
    if (!util.checkHash(password, account.ra_password)) {
      return res.redirect('/manager/login?tip=error');
    }

    connection.query('SELECT * FROM restaurants WHERE rest_owner_id=?', [account.ra_id], function (err, result) {
      if (err) throw err;
      var restaurant = result[0];
      req.session.manager = {
        id: account.ra_id,
        name: account.ra_name,
        rest_id: restaurant.rest_id,
        rest_name: restaurant.rest_name
      };
      res.redirect('/');
    });
  });
});

router.get('/logout', function (req, res) {
  req.session.destroy();
  res.redirect('/manager/login');
});

module.exports = router;

When I type localhost:80 on my browser it displays the following screen:

But ofcourse since the database is not linked, I can't get past this step and it shows the "localhost refused to connect" error!

I already have a .sql database with necessary tables created. How do I link these two so I can login from the login page?

EDIT: database.js

var mysql = require('mysql');
var c = mysql.createConnection({
  host     : 'localhost',
  user     : 'bjtu',
  password : 'bjtu',
  database : 'restaurant'
});

// enable error logging for each connection query
c.on('error', function(err) {
  console.log(err.code); // example : 'ER_BAD_DB_ERROR'
});

exports.connection = function() {
    return c;
};

CONSOLE ERROR FOR SAMPLE.JS

if (err) throw err;
           ^

Error: ER_ACCESS_DENIED_ERROR: Access denied for user 'me'@'localhost' (using password: YES)
    at Handshake.Sequence._packetToError (C:\Mrestro\RESTaurant_backend-masterest-server
ode_modules\mysql\lib\protocol\sequences\Sequence.js:51:14)
    at Handshake.ErrorPacket (C:\Mrestro\RESTaurant_backend-masterest-server
ode_modules\mysql\lib\protocol\sequences\Handshake.js:103:18)
    at Protocol._parsePacket (C:\Mrestro\RESTaurant_backend-masterest-server
ode_modules\mysql\lib\protocol\Protocol.js:280:23)
    at Parser.write (C:\Mrestro\RESTaurant_backend-masterest-server
ode_modules\mysql\lib\protocol\Parser.js:74:12)
    at Protocol.write (C:\Mrestro\RESTaurant_backend-masterest-server
ode_modules\mysql\lib\protocol\Protocol.js:39:16)
    at Socket.<anonymous> (C:\Mrestro\RESTaurant_backend-masterest-server
ode_modules\mysql\lib\Connection.js:109:28)
    at emitOne (events.js:77:13)
    at Socket.emit (events.js:169:7)
    at readableAddChunk (_stream_readable.js:153:18)
    at Socket.Readable.push (_stream_readable.js:111:10)
    --------------------
    at Protocol._enqueue (C:\Mrestro\RESTaurant_backend-masterest-server
ode_modules\mysql\lib\protocol\Protocol.js:141:48)
    at Protocol.handshake (C:\Mrestro\RESTaurant_backend-masterest-server
ode_modules\mysql\lib\protocol\Protocol.js:52:41)
    at Connection.connect (C:\Mrestro\RESTaurant_backend-masterest-server
ode_modules\mysql\lib\Connection.js:136:18)
    at Object.<anonymous> (C:\Mrestro\RESTaurant_backend-masterest-server\utils\sample.js:9:12)
    at Module._compile (module.js:409:26)
    at Object.Module._extensions..js (module.js:416:10)
    at Module.load (module.js:343:32)
    at Function.Module._load (module.js:300:12)
    at Function.Module.runMain (module.js:441:10)
    at startup (node.js:139:18)

The npm module mysql should do the trick.

Basic connect would look like this:

var mysql      = require('mysql');
var connection = mysql.createConnection({
  host     : 'localhost',
  user     : 'me',
  password : 'secret',
  database : 'my_db'
});

connection.connect();

connection.query('SELECT 1 + 1 AS solution', function(err, rows, fields) {
  if (err) throw err;

  console.log('The solution is: ', rows[0].solution);
});

connection.end();

Probably soon you would like to have a look at MongoDB. Which you can connect to using module mongoose, for example.

Update:

Try to set port to your connection object in database.js. Like this:

var mysql = require('mysql');
var c = mysql.createConnection({
  host     : 'localhost',
  user     : 'bjtu',
  password : 'bjtu',
  database : 'restaurant',
  port     : 90
});

// enable error logging for each connection query
c.on('error', function(err) {
  console.log(err.code); // example : 'ER_BAD_DB_ERROR'
});

exports.connection = function() {
    return c;
};

The default port is 3306, which doesnt look like your case :)

And I suggest you to look into mysql pools.