PostgreSQL knex无法连接到端口＆＃34;未处理的拒绝错误：连接ECONNREFUSED 127.0.0.1:5432"

Question

我一直在尝试使用knex为Node设置postgres并且完全混淆了。

我已经使用postgres进行了knex设置，如下所示：

//db.js
const config = require('../knexfile.js');
const env = process.env.NODE_ENV || 'development';
const knex = require("knex")(config[env]);

module.exports = knex;

knex.migrate.latest([config]);


//knexfile.js
module.exports = {
  development: {
    client: 'pg',
    connection: {
        host: '127.0.0.1',
        user: 'devUser',
        password: 'dbpassword',
        port: 5432,
        database: 'example-name'
    },
    migrations: {
      directory: __dirname + '/db/migrations'
    },
    seeds: {
      directory: __dirname + '/db/seeds/development'
    }
 },
  production: ....
}

然后当我尝试运行Node ...

const express = require('express');
const path = require('path');
const bodyParser = require("body-parser");
const app = express();
const routes = require('./routes.js');

app.use(bodyParser.json());

app.use(express.static(path.join(__dirname, 'client/build')));

app.use('/', routes);

app.set('port', (process.env.PORT || 3001));
app.listen(app.get('port'), () => {
    console.log(`Find the server at: http://localhost:${app.get('port')}/`); // eslint-disable-line no-console
});

module.exports = app;

...我收到以下错误：

Unhandled rejection Error: connect ECONNREFUSED 127.0.0.1:5432

当您尝试在同一端口上运行两个进程时，我看到了此消息，但运行netstat -p tcp | grep 5432则不返回任何内容。你能看到我错过了吗？