Mongo DB和Node.js连接错误

我对服务器端来说是非常新的。 我刚开始使用node.js和mongodb。

示例代码：

var http = require('http'); var mongoose = require('mongoose'); http.createServer(function (req, res) { res.writeHead(200, {'Content-Type': 'application/json; charset=utf-8'}); mongoose.connect('mongodb://localhost/bookmarks'); var db = mongoose.connection; db.on('error', console.error.bind(console, 'connection error:')); db.once('open', function callback () { // console.log('Running'); var Users = mongoose.model('users', { name: String, lastname: String, yas: Number, yer:String }); Users.find().lean().exec(function(err,users) { // console.log(JSON.stringify(users)); var sonuc=JSON.stringify(users); console.log(sonuc); res.end(sonuc); }); }); }).listen(1337,'127.0.0.1'); 

当运行我的代码，它是第一次，但是当我尝试刷新页面，我得到这个错误，并没有任何反应：

连接错误：{[错误：尝试打开未closures的连接。]状态：1}

Answer 1

您将在每个请求上打开一个新的数据库连接。 这里有一种方法可以重新安排你的代码来创build一个连接和一个Users对象，然后在请求处理器中使用它：

 var http = require('http'); var mongoose = require('mongoose'); // we want Users to be in the global scope here, not in a function // that way different functions can both see the same variable var Users = null; mongoose.connect('mongodb://localhost/bookmarks'); var db = mongoose.connection; db.on('error', console.error.bind(console, 'connection error:')); // By placing Users and createServer inside the db.once('open') callback, // we wait till mongo is ready before letting the http handler query users: db.once('open', function(){ console.log('Running'); // now overwrite the already defined Users variable: Users = mongoose.model('users', { name: String, lastname: String, yas: Number, yer:String }); http.createServer(function (req, res) { findUsers(function(err, results){ if(err){ res.writeHead(500); res.end(); } else { res.writeHead(200, {'Content-Type': 'application/json; charset=utf-8'}); res.end(results); }; }); }).listen(1337,127.0.0.1); }); function findUsers(callback){ Users.find().lean().exec(function(err,users) { // console.log(JSON.stringify(users)); var sonuc=JSON.stringify(users); console.log(sonuc); //res.end(sonuc); callback(err, sonuc); }); }