启动并运行 Node.js - 数据库连接错误答案

【问题标题】：Getting Node.js up and running - DB connection errors启动并运行 Node.js - 数据库连接错误
【发布时间】：2015-11-02 00:04:46
【问题描述】：

我是 Node.js 的超级新手，所以这可能是一个非常基本的问题，但是当控制台告诉我时发生了什么

Error: unable to connect to database at mongodb://localhost/realjoet-me-development

我正在使用 swig、sass、node、express、gulp、nodemon 和 yeoman 运行我的环境。

我在 Heroku 上使用 MongoLab 插件设置了我的数据库。

什么可能导致此错误，然后导致我的应用程序崩溃，因此我无法在本地主机上查看它？？

您还需要了解什么才能更好地了解我的情况？

这是整个控制台日志

➜  realjoet.me git:(master) ✗ gulp
[06:50:13] Using gulpfile ~/Sites/realjoet.me/gulpfile.js
[06:50:13] Starting 'sass'...
[06:50:13] Starting 'develop'...
[06:50:13] Finished 'develop' after 6.51 ms
[06:50:13] Starting 'watch'...
[06:50:13] Finished 'watch' after 9.09 ms
[06:50:13] [nodemon] 1.8.0
[06:50:13] [nodemon] to restart at any time, enter `rs`
[06:50:13] [nodemon] watching: *.*
[06:50:13] [nodemon] starting `node app.js`
[06:50:13] /Users/realjoet/Sites/realjoet.me/public/css/style.css reloaded.
[06:50:13] Finished 'sass' after 243 ms
[06:50:13] Starting 'default'...
[06:50:13] Finished 'default' after 4.09 μs
[06:50:14] /Users/realjoet/Sites/realjoet.me reloaded.
Express server listening on port 3000
/Users/realjoet/Sites/realjoet.me/node_modules/mongodb/lib/server.js:235
    process.nextTick(function() { throw err; })
                                        ^
Error: unable to connect to database at mongodb://localhost/realjoet-me-development
at NativeConnection.<anonymous> (/Users/realjoet/Sites/realjoet.me/app.js:11:9)
at NativeConnection.emit (events.js:107:17)
at NativeConnection.Connection.error (/Users/realjoet/Sites/realjoet.me/node_modules/mongoose/lib/connection.js:425:8)
at /Users/realjoet/Sites/realjoet.me/node_modules/mongoose/lib/connection.js:452:14
at /Users/realjoet/Sites/realjoet.me/node_modules/mongoose/lib/drivers/node-mongodb-native/connection.js:52:21
at /Users/realjoet/Sites/realjoet.me/node_modules/mongodb/lib/db.js:226:14
at null.<anonymous> (/Users/realjoet/Sites/realjoet.me/node_modules/mongodb/lib/server.js:233:9)
at g (events.js:199:16)
at emit (events.js:110:17)
at null.<anonymous> (/Users/realjoet/Sites/realjoet.me/node_modules/mongodb-core/lib/topologies/server.js:263:68)
at g (events.js:199:16)
at emit (events.js:110:17)
at null.<anonymous> (/Users/realjoet/Sites/realjoet.me/node_modules/mongodb-core/lib/connection/pool.js:77:12)
at g (events.js:199:16)
at emit (events.js:110:17)
at Socket.<anonymous> (/Users/realjoet/Sites/realjoet.me/node_modules/mongodb-core/lib/connection/connection.js:121:49)
[06:50:14] [nodemon] app crashed - waiting for file changes before starting...
[06:50:27] [nodemon] restarting due to changes...
[06:50:27] [nodemon] starting `node app.js`
[06:50:28] /Users/realjoet/Sites/realjoet.me reloaded.
Express server listening on port 3000
/Users/realjoet/Sites/realjoet.me/node_modules/mongodb/lib/server.js:235
    process.nextTick(function() { throw err; })
                                        ^
Error: unable to connect to database at mongodb://localhost/realjoet-me-development
at NativeConnection.<anonymous> (/Users/realjoet/Sites/realjoet.me/app.js:11:9)
at NativeConnection.emit (events.js:107:17)
at NativeConnection.Connection.error (/Users/realjoet/Sites/realjoet.me/node_modules/mongoose/lib/connection.js:425:8)
at /Users/realjoet/Sites/realjoet.me/node_modules/mongoose/lib/connection.js:452:14
at /Users/realjoet/Sites/realjoet.me/node_modules/mongoose/lib/drivers/node-mongodb-native/connection.js:52:21
at /Users/realjoet/Sites/realjoet.me/node_modules/mongodb/lib/db.js:226:14
at null.<anonymous> (/Users/realjoet/Sites/realjoet.me/node_modules/mongodb/lib/server.js:233:9)
at g (events.js:199:16)
at emit (events.js:110:17)
at null.<anonymous> (/Users/realjoet/Sites/realjoet.me/node_modules/mongodb-core/lib/topologies/server.js:263:68)
at g (events.js:199:16)
at emit (events.js:110:17)
at null.<anonymous> (/Users/realjoet/Sites/realjoet.me/node_modules/mongodb-core/lib/connection/pool.js:77:12)
at g (events.js:199:16)
at emit (events.js:110:17)
at Socket.<anonymous> (/Users/realjoet/Sites/realjoet.me/node_modules/mongodb-core/lib/connection/connection.js:121:49)
[06:50:28] [nodemon] app crashed - waiting for file changes before starting...

【问题讨论】：

您的互联网连接正常吗？访问是否被防火墙阻止？您尝试访问的地址是否有可访问的数据库？
@Jayram 前两个不知道，但我不确定最后一个......这就是我感到困惑的地方，我想。我从我的一个创建预制环境的好友那里获取了这个 Node.js 模板（在此处查看 repo：github.com/corbanb/bdw-blog），但我不确定它是如何连接的/我将如何查看第三个问题？？跨度>

标签： node.js mongodb heroku

【解决方案1】：

您应该有一个来自 mongolab 的 mongodb uri，用于您需要在应用程序中使用的数据库。查看本教程：https://devcenter.heroku.com/articles/mongolab#connecting-to-existing-mongolab-deployments-from-heroku

然后您需要将您在 Node.js 应用程序中使用的 mongodb ORM 指向该 mongodb uri。

最好的。

【讨论】：

所以我需要创建一个指向数据库的路由 router.js 文件，这就是你的意思吗？？
顺便说一句很棒的链接，很有帮助！
你现在如何连接到你的 mongodb？
我不认为我是，目前。我目前没有路线。正在研究如何连接到我的 MongoLab 数据库，我在 Heroku 上作为附加组件连接。
想通了，只是对 URI 或如何设置开发环境一无所知。那个链接让我修好了！

【解决方案2】：

想通了。只需要找到我的 MongoDB URI 并替换我的 config.js 文件中的数据库源路径。

感谢所有提供帮助的人。那个链接是离合器，@R.A.卢卡斯！

链接：https://devcenter.heroku.com/articles/mongolab#connecting-to-existing-mongolab-deployments-from-heroku

【讨论】：