如何在node.js中重用mongodb连接

您可以连接一次，然后根据需要重复使用多次：

var mongodb = require('mongodb');var events = require('events');var event = new events.EventEmitter();var access = new mongodb.Server(host, port, { });var client = null;new mongodb.Db('YOUR DATAbase', access, { safe: true, auto_reconnect: true }).open(function (err, c) {  if (!err) {    client = c;    console.log('database connected');    event.emit('connect');  } else {    console.log('database connection error', err);    event.emit('error');  }});exports.get = function(fn) {  if(client) {    fn(client);  } else {    event.on('connect', function() {      fn(client);    });  }};

然后重用它：

var db = require('./db');var items;db.get(function(client) {  items = new mongodb.Collection(client, 'collection');});// then anywhere in your predb.get(function() {  // items.find({ ...});