我尝试通过以下方式连接Heroku上的PostgreSQL数据库:
var pg = require('pg');
pg.defaults.ssl = true;
var pool = new pg.Pool(process.env.DATABASE_URL);
pool.connect(function(err, client, done) {
if(err) {
return console.error('error fetching client from pool', err);
}
我已确认 proccess.env.DATABASE_URL 的值具有正确的格式,并且我可以通过 psql 成功连接到它,其连接地址为 postgres://XXXXXXXX:XXXXXXXXXXXXXXX@XXXXXXXXXXXXX.eu-west-1.compute.amazonaws.com:5432/XXXXXXXX。
这是输出结果,让我困惑的是输出结果中的 127.0.0.1 引用。
2016-06-27T14:58:52.714154+00:00 app[web.1]: Express server listening on port 18119
2016-06-27T14:59:29.175122+00:00 app[web.1]: error fetching client from pool { Error: connect ECONNREFUSED 127.0.0.1:5432
2016-06-27T14:59:29.175133+00:00 app[web.1]: at Object.exports._errnoException (util.js:949:11)
2016-06-27T14:59:29.175134+00:00 app[web.1]: at exports._exceptionWithHostPort (util.js:972:20)
2016-06-27T14:59:29.175135+00:00 app[web.1]: at TCPConnectWrap.afterConnect [as oncomplete] (net.js:1080:14)
2016-06-27T14:59:29.175136+00:00 app[web.1]: code: 'ECONNREFUSED',
2016-06-27T14:59:29.175137+00:00 app[web.1]: errno: 'ECONNREFUSED',
2016-06-27T14:59:29.175137+00:00 app[web.1]: syscall: 'connect',
2016-06-27T14:59:29.175138+00:00 app[web.1]: address: '127.0.0.1',
2016-06-27T14:59:29.175139+00:00 app[web.1]: port: 5432 }