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

Question

我正在尝试使用 node.js 访问 mysql 数据库。我只是在 cmd 提示符下运行以下命令：

C:\rest-server> node bin/www

它会显示此消息：

Express server listening in port 80

我的 .js 文件如下，本地主机访问端口 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;

当我在浏览器上输入 localhost:80 时，它会显示以下屏幕：

当然，由于数据库没有链接，我无法通过这一步，它显示“localhost拒绝连接”错误！

我已经有一个 .sql 数据库，其中创建了必要的表。如何链接这两个以便我可以从登录页面登录？

编辑：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;
};

SAMPLE.JS 的控制台错误

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-master\rest-server\node_modules\mysql\lib\protocol\sequences\Sequence.js:51:14)
    at Handshake.ErrorPacket (C:\Mrestro\RESTaurant_backend-master\rest-server\node_modules\mysql\lib\protocol\sequences\Handshake.js:103:18)
    at Protocol._parsePacket (C:\Mrestro\RESTaurant_backend-master\rest-server\node_modules\mysql\lib\protocol\Protocol.js:280:23)
    at Parser.write (C:\Mrestro\RESTaurant_backend-master\rest-server\node_modules\mysql\lib\protocol\Parser.js:74:12)
    at Protocol.write (C:\Mrestro\RESTaurant_backend-master\rest-server\node_modules\mysql\lib\protocol\Protocol.js:39:16)
    at Socket.<anonymous> (C:\Mrestro\RESTaurant_backend-master\rest-server\node_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-master\rest-server\node_modules\mysql\lib\protocol\Protocol.js:141:48)
    at Protocol.handshake (C:\Mrestro\RESTaurant_backend-master\rest-server\node_modules\mysql\lib\protocol\Protocol.js:52:41)
    at Connection.connect (C:\Mrestro\RESTaurant_backend-master\rest-server\node_modules\mysql\lib\Connection.js:136:18)
    at Object.<anonymous> (C:\Mrestro\RESTaurant_backend-master\rest-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)

Answer 1

npm 模块 mysql 应该可以解决问题。

基本连接如下所示：

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();

您可能很快就会想看看MongoDB.，例如，您可以使用模块mongoose 连接到它。

更新：

尝试在 database.js 中为您的连接对象设置端口。像这样：

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;
};

默认端口是 3306，看起来不像你的情况 :)

我建议你研究一下 mysql 池。