錯誤：連接 ECONNREFUSED 127.0.0.1:5432 heroku

Question

我不太確定為什么我會得到這個。 當我在 Heroku 上啟動該應用程序時，我收到了一條 404 錯誤，其中包含未找到的消息，它來自我的 app.js 文件中的錯誤處理程序，但我不確定發生了什么。

一切都在本地工作？

server.js
/** Start server for jobly. */


const app = require('./app');
const { PORT } = require("./config");


app.listen(PORT, function () {
  console.log(`Server starting on port ${PORT}!`);
});

2020-07-17T03:49:35.103011+00:00 heroku[web.1]: Starting process with command `node server.js`
2020-07-17T03:49:39.311369+00:00 app[web.1]: Using database jobly-db
2020-07-17T03:49:39.885564+00:00 app[web.1]: Server starting on port 6266!
2020-07-17T03:49:39.894114+00:00 app[web.1]: (node:4) UnhandledPromiseRejectionWarning: Error: connect ECONNREFUSED 127.0.0.1:5432
2020-07-17T03:49:39.894116+00:00 app[web.1]: at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1141:16)
2020-07-17T03:49:39.894367+00:00 app[web.1]: (node:4) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
2020-07-17T03:49:39.894527+00:00 app[web.1]: (node:4) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.
2020-07-17T03:49:40.080034+00:00 heroku[web.1]: State changed from starting to up
2020-07-17T03:52:04.190766+00:00 app[api]: Attach DATABASE (@ref:postgresql-convex-54039) by user areacodelogic@gmail.com

Answer 1

請發布您的 server.js 代碼和 Procfile。 另外通過查看錯誤，似乎您已經使用了本地主機 PostgreSQL 主機，但您在 heroku 上使用了 PostgreSQL，您確定插件包含在 heroku 中嗎？ 如果添加了連接代碼，則需要使用 url 才能工作。 示例如下

    connectionString = 'postgresql://dbuser:secretpassword@database.server.com:3211/mydb'

像這樣使用：

    const { Pool, Client } = require('pg')
    const connectionString = 'postgresql://dbuser:secretpassword@database.server.com:3211/mydb'

    const pool = new Pool({
        connectionString: connectionString,
    })

或者像這樣

    var client = new Client({
        user: "username",
        password: "pwd",
        database: "dbname",
        port: 5432,
        host: "host",
        ssl: true
    });
    client.connect(function () {
        console.log("connected");
    });

你可以在這里找到解釋