node js mongodb example

This article mainly introduces node. buffer in js. buffer. description of the isBuffer method. This article introduces the buffer. buffer. isBuffer method description, syntax, receiving parameters, use instances and implementation source code. For more information, see Method description: Checks whether the target is a buffer object. Returns true or false. Syntax: The Code is as follows: Buffer. i

This article mainly introduces node. console in js. this document describes how to use the time method. time Method description, syntax, receive parameters, use instances, and implement Source Code. For more information, see Method description: Start Time, which corresponds to console. timeEnd and records the time period. Syntax: The Code is as follows: Console. time (label) Receiving parameter

The additional chapter of the python crawler. The installation of mongodb and redis databases on the machine on the master node is not an apt method. It is found that data crawled by crawlers is stored according to the table structure, which is not only troublesome but also redundant. Try this non-relational database to try the storage effect. I don't plan to use redis for comparison here, because he is a m

, and finally declare it.Let me release the Code directly, or directly go to the Node. js document to view it. The Code is as follows:# Include Using namespace v8; Handle RunCallback (const Arguments args) { HandleScope scope; Local Cb = Local : Cast (args

After you install node. js, choose a beneficial IDE for your development.After comparing multiple Ides, it is positioned on webstrom and sublime.There is a simple comparison:Webstorm feature is very rich, the front-end development tool of the synthesizer, compared to sublime slightly heavierSublime plug-in is also very rich, the interface is more beautiful, very light, also has a simple project management f

dependencies The Code is as follows: {"Name": "application-name ","Version": "0.0.1 ","Private": true,"Scripts ":{"Start": "node app. js? 1.1.9"},"Dependencies ":{"Express": "3.4.8 ","Ejs ":"*","Mongodb ":"*"}} Then run npm install to download the new dependency package. In this way, the mongoDB-related driver is a

returnedSkip: Skip Some resultsSort: Sorting the resultsFields: Returns only the specified fieldMongoDB can conveniently put some of the data that MySQL needs to be associated with a one-to-many relationship through an array + object as a document stored in a collections, and provides various APIs to support the operation of an array within a document.MongoDB Common Query method and its embodiment in node:1. Database connection mongodb:mongo-u userna

Give full play to the performance of Node. js programs and give full play to node. js A Node. JS process only runs on a single physical core. This is because you need to pay special attention when developing scalable servers. Beca

in the code: app.use(session({ secret: 'test', resave: false, saveUninitialized: true, cookie:{ maxAge: 1000*60*60 // default session expiration is set to 1 hour }, store: new MemcachedStore({ hosts: ['127.0.0.1:9000'], prefix: 'test_' })})); The above session uses memcached as the session storage method, for how to use memcached can refer to the address on Github https://github.com/balor/connect-memcached Of course, you can also use other session storage

This article mainly introduces Node. callback and code design patterns in js asynchronous programming. Although long string parentheses during callback writing are not very nice in most cases, Node's asynchronous performance is indeed good, for more information, see the event mechanism and asynchronous IO, the biggest selling point of NodeJS, which is not transparent to developers. Developers need to write

Three Node. js code optimization methods you have not known, and three node. js codes are unknown. The running of Node. js programs may be limited by the CPU or input/output operations, but it is very slow. From the CPU perspectiv

This article mainly introduces how to run Node. js IIS extension iisnode installation configuration notes, iisnode extension can put Node. js programs are hosted in IIS. after hosting, various functions in IIS can also be used. if you need them, refer to your plans to use Node