Question

我已将我的应用部署到heroku。在我转到用户注册页面并输入我的凭据后，该网站会立即崩溃，在浏览器中显示internal server error，并在heroku logs中向我提供此内容。

我不确定可能是什么问题，所以我不知道要提供哪些代码？我不认为它与MySQL有关，但考虑到错误报告中提到的，它可能是？无论哪种方式都是我的connection.js：

const mysql = require('mysql');
let connection;

if (process.env.JAWSDB_URL) {
    connection = mysql.createConnection(process.env.JAWSDB_URL);
} else {
    connection = mysql.createConnection({
        host: 'localhost',
        port: 3306,
        user: 'root',
        password: '',
        database: 'trythis_db'
    });
};

connection.connect(function(err) {
    if (err) {
        console.log(err);
    } else {
        console.log('mysql is connected');
    };
});


module.exports = connection;

这是我的错误代码：

2017-12-04T04:58:51.486756+00:00 app[web.1]: Error: connect ECONNREFUSED 127.0.0.1:3306
2017-12-04T04:58:51.486150+00:00 app[web.1]: POST /signup 302 287.664 ms - 46
2017-12-04T04:58:51.486758+00:00 app[web.1]:     at Object._errnoException (util.js:1024:11)
2017-12-04T04:58:51.486758+00:00 app[web.1]:     at _exceptionWithHostPort (util.js:1046:20)
2017-12-04T04:58:51.486759+00:00 app[web.1]:     at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1182:14)
2017-12-04T04:58:51.486760+00:00 app[web.1]:     --------------------
2017-12-04T04:58:51.486761+00:00 app[web.1]:     at Protocol._enqueue (/app/node_modules/express-mysql-session/node_modules/mysql/lib/protocol/Protocol.js:145:48)
2017-12-04T04:58:51.486762+00:00 app[web.1]:     at Protocol.handshake (/app/node_modules/express-mysql-session/node_modules/mysql/lib/protocol/Protocol.js:52:23)
2017-12-04T04:58:51.486763+00:00 app[web.1]:     at PoolConnection.connect (/app/node_modules/express-mysql-session/node_modules/mysql/lib/Connection.js:130:18)
2017-12-04T04:58:51.486763+00:00 app[web.1]:     at Pool.getConnection (/app/node_modules/express-mysql-session/node_modules/mysql/lib/Pool.js:48:16)
2017-12-04T04:58:51.486764+00:00 app[web.1]:     at Pool.query (/app/node_modules/express-mysql-session/node_modules/mysql/lib/Pool.js:202:8)
2017-12-04T04:58:51.486765+00:00 app[web.1]:     at MySQLStore.set (/app/node_modules/express-mysql-session/lib/index.js:192:19)
2017-12-04T04:58:51.486766+00:00 app[web.1]:     at Session.save (/app/node_modules/express-session/session/session.js:72:25)
2017-12-04T04:58:51.486766+00:00 app[web.1]:     at Session.save (/app/node_modules/express-session/index.js:381:15)
2017-12-04T04:58:51.486767+00:00 app[web.1]:     at ServerResponse.end (/app/node_modules/express-session/index.js:330:21)
2017-12-04T04:58:51.486768+00:00 app[web.1]:     at ServerResponse.redirect (/app/node_modules/express/lib/response.js:947:10)
2017-12-04T04:58:51.638706+00:00 app[web.1]: Error: connect ECONNREFUSED 127.0.0.1:3306
2017-12-04T04:58:51.638708+00:00 app[web.1]:     at Object._errnoException (util.js:1024:11)
2017-12-04T04:58:51.638709+00:00 app[web.1]:     at _exceptionWithHostPort (util.js:1046:20)
2017-12-04T04:58:51.638710+00:00 app[web.1]:     at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1182:14)
2017-12-04T04:58:51.638710+00:00 app[web.1]:     --------------------
2017-12-04T04:58:51.638711+00:00 app[web.1]:     at Protocol._enqueue (/app/node_modules/express-mysql-session/node_modules/mysql/lib/protocol/Protocol.js:145:48)
2017-12-04T04:58:51.638712+00:00 app[web.1]:     at Protocol.handshake (/app/node_modules/express-mysql-session/node_modules/mysql/lib/protocol/Protocol.js:52:23)
2017-12-04T04:58:51.638713+00:00 app[web.1]:     at PoolConnection.connect (/app/node_modules/express-mysql-session/node_modules/mysql/lib/Connection.js:130:18)
2017-12-04T04:58:51.638713+00:00 app[web.1]:     at Pool.getConnection (/app/node_modules/express-mysql-session/node_modules/mysql/lib/Pool.js:48:16)
2017-12-04T04:58:51.638714+00:00 app[web.1]:     at Pool.query (/app/node_modules/express-mysql-session/node_modules/mysql/lib/Pool.js:202:8)
2017-12-04T04:58:51.638802+00:00 app[web.1]:     at session (/app/node_modules/express-session/index.js:460:11)
2017-12-04T04:58:51.638800+00:00 app[web.1]:     at MySQLStore.get (/app/node_modules/express-mysql-session/lib/index.js:130:19)
2017-12-04T04:58:51.638803+00:00 app[web.1]:     at Layer.handle [as handle_request] (/app/node_modules/express/lib/router/layer.js:95:5)
2017-12-04T04:58:51.638804+00:00 app[web.1]:     at trim_prefix (/app/node_modules/express/lib/router/index.js:317:13)
2017-12-04T04:58:51.638804+00:00 app[web.1]:     at /app/node_modules/express/lib/router/index.js:284:7

Answer 1

错误的第一行（Error: connect ECONNREFUSED 127.0.0.1:3306）表示应用程序尝试连接到localhost，即使它是在线托管，也应该尝试连接到联机数据库。您需要弄清if-else语句中的错误，因为else循环正在执行，我想这是针对您当地的环境。

Answer 2

确保在项目配置变量下添加了JAWSDB_URL。

（Heroku项目 - ＆gt;设置 - ＆gt;配置变量 - ＆gt;显示变量 - ＆gt;您的var）

Answer 3

问题出在另一个与在MySQL中存储会话有关的库......

Heroku节点部署＆＃34;内部服务器错误＆＃34;

3 个答案: