node.js传递变量 [英] node.js passing variables

问题描述

我在这里找到一些经验丰富的node.js程序员。我遇到的最大的问题是将变量传递到单独的模块。例如在我的server.js中我有以下：

I am looking for some direction here from some seasoned node.js programmers. The biggest issue I am running into is passing around variables into separate modules. For example in my server.js I have the following:

var db = mongoose.createConnection('localhost','test');

现在我没有在server.js文件中运行我的路由， 。因此，对于博客示例，它可能是这样的：

Now I am not running my routes inside of the server.js file they are separated into there own files. So for a blog example it might be like this:

app.get('/blog/post/:id',function(req,res){
    //do something here
}

这是问题所在。我不想在每个路由中设置数据库连接，更不用说我会认为它会创建大量的连接，如何处理这个，是否有一个示例REAL WORLD应用程序，因为我似乎没有找到任何关于这一点，我知道人们不得不有这个问题之前。我知道节点缓存模块，但我不能想象它会缓存连接，因为它是在它的自己的模块。我创建了一个配置模块，只是保存的网站配置，所以要求这里，我需要它不是一个问题。我想有其他事情，我要做这个，所以最好现在解决这个问题

Now this is where the problem comes in. I do not want to have to setup a database connection in each of my routes and not to mention I would think that it would make a ton of connections. How do I handle this, is there a sample "REAL WORLD" application out there because I cannot seem to find anything about this and I know people have had to have this problem before. I know that node caches the modules but I cant imagine that it would cache the connection given it was in its own module. I created a config module that just holds the site config so requiring this where I need it is not a problem. I imagine there are other things that I am gonna wanna do this with so it would be best to figure this out now.

任何帮助。

推荐答案

在我的现实世界的应用程序。

Here's what I do in my real world app.

我有一个模块名为 redis （这是我使用的数据库）。它包含以下代码：

I have a module named redis (that's the database I'm using). It contains the following code:

var store;

exports.store = store = redis.createClient(config.port, config.url);

因此，如果需要，我可以直接访问客户端。我几乎从来没有这样做。同一个模块包含如下代码：

So, I can directly access the client, if I need to. I almost never do that. The same module contains code like this:

exports.getData = function(dataID, callback){

    var key = DATA_STORE_PREFIX;

    try{
        store.hget(key, dataID, callback);
    } catch(err){
        callback(err);
    }
}

我通过使用 redis 模块并调用它，如下所示：

I use this by including the redis module in one or more route modules and calling it like this:

var db = require('redis');

db.getData('someData', function(err, result){
    console.log(result); // real world code goes here!
});

节点模块系统负责处理。

The node module system takes care of the rest.

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