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Editor to share with you node.js how to query a piece of data, I believe that most people do not know much about it, so share this article for your reference, I hope you can learn a lot after reading this article, let's go to understand it!

Node.js query a piece of data: 1, create relevant js files; 2, through the code "const MongodbClient = require (" mongodb ") .MongoClient, assert = require..." Just query a piece of data.

This article operating environment: windows7 system, mongodb nodeJS driver 3.2.3 version, Dell G3 computer.

NodeJs uses mongodb to query a piece of data

For source code, please see GitHub: https://github.com/slhuang520/study/tree/master/web/nodeJS/mongoDB/findOne.js.

The version of mongodb nodeJS driver currently in use is 3.2.3

Methods vary greatly from version to version of Driver.

When querying a piece of data, you can also use sorting, or certain conditions on time.

Const MongodbClient = require ("mongodb"). MongoClient, assert = require ("assert"); (async () = > {const url = "mongodb://127.0.0.1:27017", dbName = "mydb", client = new MongodbClient (url); try {await client.connect (); const db = client.db (dbName); let col = await db.collection ("user")) Col.findOne () .then (res = > {console.log (res); / / {_ id: 5ccd913ef78b417285224075, name: 'Jim', age: 12}});} catch (e) {console.log (e.stack);} finally {client.close ();}}) () The above is all the contents of the article "how to query a piece of data in node.js". Thank you for reading! I believe we all have a certain understanding, hope to share the content to help you, if you want to learn more knowledge, welcome to follow the industry information channel!

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