如何在没有猫鼬的情况下使用Express连接到mongodb? [英] How can I connect to mongodb using express without mongoose?

问题描述

我正在使用express框架，并希望不使用mongoose而是使用本机nodejs Mongodb驱动程序来连接到mongodb.如何做到这一点而又不必每次都建立新的连接?

I am using the express framework and would like to connect to a mongodb without using mongoose, but with the native nodejs Mongodb driver. How can I do this without creating a new connection every time?

要处理获取或发布请求，我目前为每个请求打开一个与数据库的新连接，并在请求完成时将其关闭.有一个更好的方法吗?预先感谢.

To handle get or post requests I currently open a new connection to the db for every request and close it on completion of the request. Is there a better way to do this? Thanks in advance.

推荐答案

按照我的注释中的示例进行修改，以便应用程序能够处理错误而不是无法启动服务器.

Following the example from my comment, modifying it so that the app handles errors rather than failing to start the server.

var express = require('express');
var mongodb = require('mongodb');
var app = express();

var MongoClient = require('mongodb').MongoClient;
var db;

// Initialize connection once
MongoClient.connect("mongodb://localhost:27017/integration_test", function(err, database) {
  if(err) return console.error(err);

  db = database;

  // the Mongo driver recommends starting the server here because most apps *should* fail to start if they have no DB.  If yours is the exception, move the server startup elsewhere. 
});

// Reuse database object in request handlers
app.get("/", function(req, res, next) {
  db.collection("replicaset_mongo_client_collection").find({}, function(err, docs) {
    if(err) return next(err);
    docs.each(function(err, doc) {
      if(doc) {
        console.log(doc);
      }
      else {
        res.end();
      }
    });
  });
});

app.use(function(err, req, res){
   // handle error here.  For example, logging and returning a friendly error page
});

// Starting the app here will work, but some users will get errors if the db connection process is slow.  
  app.listen(3000);
  console.log("Listening on port 3000");

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