尝试将我的node.js 连接到 Heroku PostgreSQL 数据库。遵循 Heroku Postgres 教程

问题描述 投票：0回答：6

我正在关注这两个 Heroku 教程：

https://devcenter.heroku.com/articles/getting-started-with-nodejs

和

https://devcenter.heroku.com/articles/heroku-postgresql

我的“hello world”应用程序正在运行。但是当我添加 node.js 代码以连接到 postgreSQL 时出现错误。

我的package.json

{
  "name": "node-example",
  "version": "0.0.1",
  "dependencies": {
    "pg": "2.x",
    "express": "3.1.x"
  },
  "engines": {
    "node": "0.10.x",
    "npm": "1.2.x"
  }
}

我的 web.js

var express = require("express");
var app = express();
app.use(express.logger());

app.get('/', function(request, response) {
  response.send('Hello World!');
});

var port = process.env.PORT || 5000;
app.listen(port, function() {
  console.log("Listening on " + port);
});

var pg = require('pg');

pg.connect(process.env.DATABASE_URL, function(err, client, done) {
  client.query('SELECT * FROM your_table', function(err, result) {
    done();
    if(err) return console.error(err);
    console.log(result.rows);
  });
});

我的 Heroku postgres 数据库运行良好，我可以直接使用

连接到它 
heroku pg:psql

这是我的日志：

2013-09-29T13:13:34.777156+00:00 heroku[web.1]: State changed from starting to up
2013-09-29T13:13:34.784018+00:00 app[web.1]: 
2013-09-29T13:13:34.787193+00:00 app[web.1]: events.js:72
2013-09-29T13:13:34.787469+00:00 app[web.1]:         throw er; // Unhandled 'error' event
2013-09-29T13:13:34.787642+00:00 app[web.1]:               ^
2013-09-29T13:13:34.790791+00:00 app[web.1]: error: relation "junk" does not exist
2013-09-29T13:13:34.790791+00:00 app[web.1]:     at Connection.parseE (/app/node_modules/pg/lib/connection.js:546:11)
2013-09-29T13:13:34.790791+00:00 app[web.1]:     at Connection.parseMessage (/app/node_modules/pg/lib/connection.js:375:17)
2013-09-29T13:13:34.790791+00:00 app[web.1]:     at null.<anonymous> (/app/node_modules/pg/lib/connection.js:92:20)
2013-09-29T13:13:34.790791+00:00 app[web.1]:     at Socket.EventEmitter.emit (events.js:95:17)
2013-09-29T13:13:34.790791+00:00 app[web.1]:     at Socket.<anonymous> (_stream_readable.js:746:14)
2013-09-29T13:13:34.790791+00:00 app[web.1]:     at Socket.EventEmitter.emit (events.js:92:17)
2013-09-29T13:13:34.790791+00:00 app[web.1]:     at emitReadable_ (_stream_readable.js:408:10)
2013-09-29T13:13:34.790791+00:00 app[web.1]:     at emitReadable (_stream_readable.js:404:5)
2013-09-29T13:13:34.790791+00:00 app[web.1]:     at readableAddChunk (_stream_readable.js:165:9)
2013-09-29T13:13:34.790968+00:00 app[web.1]:     at Socket.Readable.push (_stream_readable.js:127:10)
2013-09-29T13:13:36.511975+00:00 heroku[web.1]: Process exited with status 8
2013-09-29T13:13:36.527681+00:00 heroku[web.1]: State changed from up to crashed
2013-09-29T13:21:22+00:00 heroku[slug-compiler]: Slug compilation started
2013-09-29T13:21:38+00:00 heroku[slug-compiler]: Slug compilation finished
2013-09-29T13:21:39.239935+00:00 heroku[web.1]: State changed from crashed to starting
2013-09-29T13:21:40.589773+00:00 heroku[web.1]: Starting process with command `node web.js`
2013-09-29T13:21:41.345806+00:00 app[web.1]: Listening on 20977
2013-09-29T13:21:41.368323+00:00 app[web.1]: { [error: relation "your_table" does not exist]
2013-09-29T13:21:41.368323+00:00 app[web.1]:   length: 101,
2013-09-29T13:21:41.368323+00:00 app[web.1]:   detail: undefined,
2013-09-29T13:21:41.368323+00:00 app[web.1]:   severity: 'ERROR',
2013-09-29T13:21:41.368323+00:00 app[web.1]:   hint: undefined,
2013-09-29T13:21:41.368323+00:00 app[web.1]:   position: '15',
2013-09-29T13:21:41.368323+00:00 app[web.1]:   code: '42P01',
2013-09-29T13:21:41.368323+00:00 app[web.1]:   name: 'error',
2013-09-29T13:21:41.368323+00:00 app[web.1]:   internalPosition: undefined,
2013-09-29T13:21:41.368512+00:00 app[web.1]:   where: undefined,
2013-09-29T13:21:41.368512+00:00 app[web.1]:   file: 'parse_relation.c',
2013-09-29T13:21:41.368512+00:00 app[web.1]:   line: '864',
2013-09-29T13:21:41.368323+00:00 app[web.1]:   internalQuery: undefined,
2013-09-29T13:21:41.368512+00:00 app[web.1]:   routine: 'parserOpenTable' }
2013-09-29T13:21:41.938926+00:00 heroku[web.1]: State changed from starting to up
2013-09-29T13:21:38.600520+00:00 heroku[api]: Deploy 95a0a35 by *********@gmail.com
2013-09-29T13:21:38.625733+00:00 heroku[api]: Release v17 created by *******@gmail.com
2013-09-29T13:22:08.383050+00:00 heroku[router]: at=info method=GET path=/ host=pure-lake-7106.herokuapp.com fwd="58.7.243.156" dyno=web.1 connect=3ms service=6ms status=200 bytes=12
2013-09-29T13:22:08.383327+00:00 app[web.1]: - - - [Sun, 29 Sep 2013 13:22:08 GMT] "GET / HTTP/1.1" 200 12 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/28.0.1500.71 Chrome/28.0.1500.71 Safari/537.36"
2013-09-29T13:22:10.046808+00:00 app[web.1]: - - - [Sun, 29 Sep 2013 13:22:10 GMT] "GET /favicon.ico HTTP/1.1" 404 - "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/28.0.1500.71 Chrome/28.0.1500.71 Safari/537.36"
2013-09-29T13:22:10.049179+00:00 heroku[router]: at=info method=GET path=/favicon.ico host=pure-lake-7106.herokuapp.com fwd="58.7.243.156" dyno=web.1 connect=1ms service=3ms status=404 bytes=34
2013-09-29T13:29:40+00:00 heroku[slug-compiler]: Slug compilation started
2013-09-29T13:30:07.484077+00:00 heroku[api]: Deploy a2cc795 by [email protected]
2013-09-29T13:30:07.515481+00:00 heroku[api]: Release v18 created by [email protected]
2013-09-29T13:30:07+00:00 heroku[slug-compiler]: Slug compilation finished
2013-09-29T13:30:08.016355+00:00 heroku[web.1]: State changed from up to starting
2013-09-29T13:30:10.017792+00:00 heroku[web.1]: Starting process with command `node web.js`
2013-09-29T13:30:10.099473+00:00 heroku[web.1]: Stopping all processes with SIGTERM
2013-09-29T13:30:11.008770+00:00 app[web.1]: Listening on 47344
2013-09-29T13:30:11.065531+00:00 app[web.1]:   name: 'error',
2013-09-29T13:30:11.065531+00:00 app[web.1]:   length: 101,
2013-09-29T13:30:11.065531+00:00 app[web.1]:   severity: 'ERROR',
2013-09-29T13:30:11.065531+00:00 app[web.1]:   code: '42P01',
2013-09-29T13:30:11.065531+00:00 app[web.1]:   detail: undefined,
2013-09-29T13:30:11.065531+00:00 app[web.1]:   position: '15',
2013-09-29T13:30:11.065531+00:00 app[web.1]: { [error: relation "your_table" does not exist]
2013-09-29T13:30:11.065531+00:00 app[web.1]:   internalPosition: undefined,
2013-09-29T13:30:11.065531+00:00 app[web.1]:   internalQuery: undefined,
2013-09-29T13:30:11.065840+00:00 app[web.1]:   where: undefined,
2013-09-29T13:30:11.065840+00:00 app[web.1]:   file: 'parse_relation.c',
2013-09-29T13:30:11.065840+00:00 app[web.1]:   line: '864',
2013-09-29T13:30:11.065840+00:00 app[web.1]:   routine: 'parserOpenTable' }
2013-09-29T13:30:11.065531+00:00 app[web.1]:   hint: undefined,
2013-09-29T13:30:11.482704+00:00 heroku[web.1]: State changed from starting to up
2013-09-29T13:30:11.651117+00:00 heroku[web.1]: Process exited with status 143
2013-09-29T13:30:17.729604+00:00 app[web.1]: - - - [Sun, 29 Sep 2013 13:30:17 GMT] "GET / HTTP/1.1" 200 12 "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/28.0.1500.71 Chrome/28.0.1500.71 Safari/537.36"
2013-09-29T13:30:19.361615+00:00 heroku[router]: at=info method=GET path=/favicon.ico host=pure-lake-7106.herokuapp.com fwd="58.7.243.156" dyno=web.1 connect=1ms service=3ms status=404 bytes=34
2013-09-29T13:30:19.364457+00:00 app[web.1]: - - - [Sun, 29 Sep 2013 13:30:19 GMT] "GET /favicon.ico HTTP/1.1" 404 - "-" "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Ubuntu Chromium/28.0.1500.71 Chrome/28.0.1500.71 Safari/537.36"
2013-09-29T13:30:17.728815+00:00 heroku[router]: at=info method=GET path=/ host=pure-lake-7106.herokuapp.com fwd="58.7.243.156" dyno=web.1 connect=1ms service=19ms status=200 bytes=12
2013-09-29T13:32:28+00:00 heroku[slug-compiler]: Slug compilation started
2013-09-29T13:32:43.338858+00:00 heroku[api]: Deploy d4cf2ba by [email protected]
2013-09-29T13:32:43.359317+00:00 heroku[api]: Release v19 created by [email protected]
2013-09-29T13:32:43+00:00 heroku[slug-compiler]: Slug compilation finished
2013-09-29T13:32:43.746015+00:00 heroku[web.1]: State changed from up to starting
2013-09-29T13:32:45.354842+00:00 heroku[web.1]: Starting process with command `node web.js`
2013-09-29T13:32:46.098651+00:00 app[web.1]: Listening on 37156
2013-09-29T13:32:47.127328+00:00 app[web.1]: { [error: relation "your_table" does not exist]
2013-09-29T13:32:47.127328+00:00 app[web.1]:   code: '42P01',
2013-09-29T13:32:47.127328+00:00 app[web.1]:   name: 'error',
2013-09-29T13:32:47.127328+00:00 app[web.1]:   length: 101,
2013-09-29T13:32:47.127328+00:00 app[web.1]:   hint: undefined,
2013-09-29T13:32:47.127328+00:00 app[web.1]:   position: '15',
2013-09-29T13:32:47.127328+00:00 app[web.1]:   severity: 'ERROR',
2013-09-29T13:32:47.127328+00:00 app[web.1]:   detail: undefined,
2013-09-29T13:32:47.127561+00:00 app[web.1]:   where: undefined,
2013-09-29T13:32:47.127561+00:00 app[web.1]:   routine: 'parserOpenTable' }
2013-09-29T13:32:47.127328+00:00 app[web.1]:   internalPosition: undefined,
2013-09-29T13:32:47.127328+00:00 app[web.1]:   internalQuery: undefined,
2013-09-29T13:32:47.127561+00:00 app[web.1]:   file: 'parse_relation.c',
2013-09-29T13:32:47.127561+00:00 app[web.1]:   line: '864',
2013-09-29T13:32:47.197293+00:00 heroku[web.1]: State changed from starting to up
2013-09-29T13:32:50.505267+00:00 heroku[web.1]: Stopping all processes with SIGTERM
2013-09-29T13:32:53.246120+00:00 heroku[web.1]: Process exited with status 143
2013-09-29T14:39:50.833246+00:00 heroku[web.1]: Idling
2013-09-29T14:39:52.828292+00:00 heroku[web.1]: Stopping all processes with SIGTERM
2013-09-29T14:39:54.545662+00:00 heroku[web.1]: Process exited with status 143
2013-09-29T14:39:54.559151+00:00 heroku[web.1]: State changed from up to down

当我进行工头启动时，我收到此错误

p$ foreman start
12:39:41 web.1  | started with pid 13983
12:39:41 web.1  | Listening on 5000
12:39:41 web.1  | /home/roland/github/heroku_app/web.js:18
12:39:41 web.1  |   client.query('SELECT * FROM your_table', function(err, result) {
12:39:41 web.1  |          ^
12:39:41 web.1  | TypeError: Cannot call method 'query' of null
12:39:41 web.1  |     at /home/roland/github/heroku_app/web.js:18:10
12:39:41 web.1  |     at /home/roland/github/heroku_app/node_modules/pg/lib/pool.js:54:25
12:39:41 web.1  |     at /home/roland/github/heroku_app/node_modules/pg/node_modules/generic-pool/lib/generic-pool.js:271:11
12:39:41 web.1  |     at /home/roland/github/heroku_app/node_modules/pg/lib/pool.js:27:26
12:39:41 web.1  |     at null.<anonymous> (/home/roland/github/heroku_app/node_modules/pg/lib/client.js:169:9)
12:39:41 web.1  |     at EventEmitter.emit (events.js:95:17)
12:39:41 web.1  |     at null.<anonymous> (/home/roland/github/heroku_app/node_modules/pg/lib/connection.js:97:12)
12:39:41 web.1  |     at Socket.EventEmitter.emit (events.js:95:17)
12:39:41 web.1  |     at Socket.<anonymous> (_stream_readable.js:746:14)
12:39:41 web.1  |     at Socket.EventEmitter.emit (events.js:92:17)
12:39:41 web.1  | exited with code 8
12:39:41 system | sending SIGTERM to all processes
SIGTERM received

编辑我的console.logs；

var express = require("express");
var app = express();
app.use(express.logger());

app.get('/', function(request, response) {
  response.send('Hello World!');
  console.log("hello roland");
});

var port = process.env.PORT || 5000;
app.listen(port, function() {
  console.log("Listening on " + port);
});

var pg = require('pg');


pg.connect(process.env.DATABASE_URL, function(err, client, done) {
   console.log(err+"!!!!!!!!!!!!!!!");
  client.query('SELECT * FROM your_table', function(err, result) {
    done();
    if(err) return console.error(err);
    console.log(result.rows);
  });
});
node.js postgresql heroku
6个回答
22
投票

这是 Heroku 的问题。他们告诉您在 pg.connect 中使用的“process.env.DATABASE_URL”变量不起作用。

一个简单的

console.log(process.env.DATABASE_URL);

会显示该变量未定义。

在 Heroku 提供修复之前，您可以将连接 URL 硬编码为 pg.connect() 的第一个参数。

要查找您的凭据，您可以通过 http://heroku.com 转到应用程序的 PostgreSQL 附加连接设置。

新的 pg.connect 方法看起来像 

var connectionString = "postgres://*USERNAME*:*PASSWORD*@*HOST*:*PORT*/*DATABASE*"

pg.connect(connectionString, function(err, client, done) {
   client.query('SELECT * FROM your_table', function(err, result) {
      done();
      if(err) return console.error(err);
      console.log(result.rows);
   });
});
14
投票

如果上述答案对任何人来说都有点不足（他们对我来说是这样） - 尝试将 

?ssl=true
附加到 DATABASE_URL 环境变量的末尾。感谢这个答案的作者。祝你好运。

2
投票

您可以使用： 

heroku pg:info
命令列出您的所有数据库。在那里你会找到可以在你的应用程序中使用的确切数据库 URL - 它应该是这样的：
HEROKU_POSTGRESQL_DBNAME_URL
。这个url可以在node.js应用程序中使用：

pg.connect(process.env.HEROKU_POSTGRESQL_DBNAME_URL, function(err, client, done) {
   client.query('SELECT * FROM your_table', function(err, result) {
      done();
      if(err) return console.error(err);
      console.log(result.rows);
   });
});
2
投票

尝试

heroku pg:promote
，像这样：

heroku pg:promote HEROKU_POSTGRESQL_WHATEVER_URL

这应该在 Heroku 端设置 DATABASE_URL 变量。

0
投票

我不建议对 URL 进行硬编码，因为您可能愿意使用相同的代码创建临时应用程序。

您可以使用 

nconf
来确保 Heroku 的环境变量（存储在 
.env
文件中，在使用 
foreman
启动应用程序时由 
Procfile
读取）。

您可以创建一个 

config.js
文件来收集变量：

const nconf = require('nconf')

module.exports = nconf.argv().env()

然后用它来检索你的变量：

import config from './config'

config.get('HEROKU_POSTGRESQL_DBNAME_URL')

请注意，您可以在本地计算机上使用与 Heroku 完全相同的设置。您所需要的只是创建一个 

Procfile
来描述如何启动服务器和一个包含本地变量（例如本地 postgresql 数据库 url）的 
.env
文件。检查https://github.com/strongloop/node-foreman

0
投票

我在将 NestJS（NodeJS 应用程序）连接到 Heroku PostgreSQL 数据库时遇到了同样的问题。我通过在 ormconfig.json 文件中添加 SSL: true 属性来修复它。

将以下代码片段用于 NodeJS 应用程序：

const { Client } = require('pg');

const client = new Client({
  connectionString: process.env.DATABASE_URL,
  ssl: true,
});

client.connect();

client.query('SELECT table_schema,table_name FROM information_schema.tables;', (err, res) => {
  if (err) throw err;
  for (let row of res.rows) {
    console.log(JSON.stringify(row));
  }
  client.end();
});

对于 Java 应用程序：

@Configuration
public class MainConfig {

@Bean
public BasicDataSource dataSource() throws URISyntaxException {
    URI dbUri = new URI(System.getenv("DATABASE_URL"));

    String username = dbUri.getUserInfo().split(":")[0];
    String password = dbUri.getUserInfo().split(":")[1];
    String dbUrl = "jdbc:postgresql://" + dbUri.getHost() + ':' + dbUri.getPort() + dbUri.getPath() + "?sslmode=require";

    BasicDataSource basicDataSource = new BasicDataSource();
    basicDataSource.setUrl(dbUrl);
    basicDataSource.setUsername(username);
    basicDataSource.setPassword(password);

    return basicDataSource;
}}

注意：请点击此链接了解其他技术数据库连接详细信息。

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