node js mongodb example

import it, as shown in the following code: The Code is as follows: Var module = require ('module _ name ') The above code imports a module named module_name, which may be a core module or a module installed with NPM. The require function returns an object containing all the public APIs of the module. The returned object may be any JavaScript value, a function, or an object that contains a series of attributes (functions, arrays, or any JavaScript Object. Export Module The CommonJS module syst

V8 had the ability to identify more JavaScript commands. For example file related things, originally JS can not do, now I use C + + at the bottom to achieve good, and then tell V8, when the user wrote in JS file.open (XXX), to use C + + to execute the function of file open,So your JS (b) is the ability to handle the f

Interface api on top of an object db) Although Node. js is really good at real-time interaction applications, it is also very suitable for querying data such as MongoDB through object database (object DB ). Data stored in JSON format can be processed directly by Node. js wi

This article mainly introduces Node. js getting started Tutorial: install and configure Node on windows and Linux. the js method is illustrated in the following illustration. The detailed steps are to learn how to install node. js

Node. js blog instance (9) Tag and tag page, node. js instance Original tutorial. Each article has a maximum of three tags (less than three tags can also be). When you click the link on the left-side tab of the home page, you can jump to the tab and list all existing tags. When you click any tag link, go to this tab an

This article mainly introduces node. the js entry-level instance helloworld describes node in detail. js simple output example helloworld implementation code and running method. If you need it, refer to the example in this article

plug-in. Install JSDT 1. Choose tools> plug-in installation> manually install eclipse plug-in, and click "available software site", as shown in figure 2. check indigo (Note: After this check box is selected, HBuilder checks whether the plug-in installed in indigo has been upgraded during startup, resulting in slow software startup or slow comparison of cards for a long time after startup, therefore, after jdt is installed, remove this check box .) 3. Click "OK" and click the drop-down arrow t

a more advanced solution, you might need a message route that specifically handles Message Queuing and requires a more robust sending mechanism, such as overwriting a user who is temporarily offline when sending, or storing a message for an offline registered user that has not yet been received, and so on. But no matter what improvements you have made, node. JS will follow a basic principle: respond to eve

Sails is an intermediate Node. js architecture that helps us easily build web applications. And node. js and Sails log mechanisms have also been mentioned in this Article. If you need them, you can study them together. This article will start with the installation of sails and then introduce

Message Queuing and requires a more robust sending mechanism, such as overwriting a user who is temporarily offline when sending, or storing a message for an offline registered user that has not yet been received, and so on. But no matter what improvements you have made, node. JS will follow a basic principle: respond to events, handle multiple concurrent connections, and maintain a fluid user experience.O

to the current context, such as var math = require ('Math ');2). module definition: Use the exports object to export methods or variables of the current module. A module object exists in the module. exports is actually a module attribute. In Node, a file is a module, and the "global variables" in the module are invisible to the outside. Only the attributes mounted on exports are public, such as exports. add = function () {}; exports. PI = 3.1415926;3

process number export PATH = $ PATH:/usr/local/bin # specify the Node executable program installation directory here, my options are/usr/local/binexport NODE_PATH = $ NODE_PATH: /usr/local/lib/node_modules # the path of the Node class library # You do not need to modify node = nodeforever = forevercase "$1" in start) $ forever start-l $ LOG -- pidFile $ PID-a $

Use node. js to create the website front-end and node. js front-end What can node. js do? I still don't know where he is widely used, and I have no chance to access such a project. Just because I like it, I made a website and back

This article describes how to use Node. js to compile extensions for other programs. The example in this article is to use Node to allow JavaScript code to interact with C ++ applications. For more information, see Start preparation First, we use the following directory structure to create a

, and difficult to debug.Python (Tornado): multiple requests are executed in turn in a single process and switched to another request when I/O is encountered. Disadvantage: for a single request, there is still no time for the most efficient use.What is "the most efficient use of time 」? For example, if there are two unrelated database queries, one is usually executed in PHP, and the second is executed after the execution is completed (the total time i

I needed a problem when I was working on the project today. I wanted to find a string, but I forgot it. It was in that file, so I remembered node. js, finding this string without any pressure, shares with you the following requirements: The entire directory is about 40 MB, and there are countless files. For a long time, I cannot tell which file the character string belongs. Powerful and eye-catching

As a good Restfull Api, it is not only about the semantics, readability, power, and orthogonal of service URLs, but also about http Status codes. A good Http Status Code gives users a good response, for example, 200 indicates normal success, 201 indicates successful creation, 409 conflict, and 404 resource does not exist. Therefore, we are working on a node-based architecture.

written in C/C ++ and loaded using the dlopen () method.3). json file: Read the file synchronously through the fs module and parse the returned results using JSON. parse ().4) Other extension files: All files are loaded as. js files. We know that each module file contains the require, exports, and module variables by default, and even in the Node API documentation, we know that each module has two variable

This article will introduce you to the front-end and back-end of the practical node. js website, which is very detailed. If you need it, you can refer to what node. js can do? I still don't know where he is widely used, and I have no chance to access such a project. Just because I like it, I made a website and backgrou

Great routine analysis of node. js Reading Notes, node. js Reading Notes This week, nodejs learned how to use several dependent packages and used all the examples in the book. This article takes the routine as a clue to review the work of the week. 1. connect This routine mainly uses the connect dependency package. con