如何从node-mongo本机驱动程序获取db实例? [英] How to get a instance of db from node-mongo native driver?

问题描述

考虑一下，我在主app.js文件本身中打开了MongoDB连接，下面的代码包含在其中:

Consider, I have MongoDB connection opened in the main app.js file itself and the following code fall in it's call back:

mongodb.connect('MongoDBUrlGoesHere', function (err, db) {
   app.listen(app.get('port'), function AppListnCB() {
       console.log("Server listening on port " + app.get('port'));
   });
});

完成所有这些操作后，整个应用程序中只有一个数据库实例.

This is all done to have only one db instance across the application.

现在，如果我们在另一个external.js文件中，并且需要一个有铅的相同db对象，则该对象已连接.如果我们使用的是 mongoskin 或

Now, If we are in another external.js file and need a same db object which is aleady has connected. This can be done very easily if we are using mongoskin or mongoose

有人可以帮助我找到如何使用本机驱动程序吗?

Can someone help me to find how this can be done with native driver?

推荐答案

您可以编写包装器，这是一个用于存储数据库实例的新模块，类似于以下内容:

You could write a wrapper, a new module where you store the db instance, something similar to this:

//db.js
var HOSTNAME = ...
var PORT = ...

var db = module.exports = {};
var instance;

db.connect = function (){
    ...
    instance = <db_instance>;
};

db.disconnect = function (){
    ...
    instance = null;
};

db.instance = function (){
    return instance;
};

现在，每次需要数据库实例时，都可以通过以下方式检索它:

Now, every time you need the db instance retrieve it by doing:

var db = require ("./path/to/db");
db.instance ();

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