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It is believed that many inexperienced people have no idea about how to access MongoDB in nodejs. Therefore, this article summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

On localhost:27017 's server, create a database table called person under the database admin, and insert two records:

The image above shows two successfully inserted records viewed with MongoDB Compass.

Let's read these two records with nodejs.

First execute npm install mongodb on the command line

Then create a new JavaScript file and copy the following:

Notice the dbo.collection ("person") in line 12. Find ({}) .toArray, which means to read all records in the table person.

Var MongoClient = require ('mongodb'). MongoClient;var url = "mongodb://localhost:27017"; MongoClient.connect (url, function (err, db) {if (err) {console.log (err); throw err;} console.log ("Jerry DB connection established!"); var dbo = db.db ("admin"); dbo.collection ("person"). Find ({}) .toArray (function (err, result) {if (err) throw err; console.log (result); db.close ();}); db.close ();})

If I only want to read the record whose name is Jerry, I just need to pass the where condition into the method find:

It can be observed from the debugger that it has been read back in the desired way:

After reading the above, have you mastered how to access MongoDB in nodejs? If you want to learn more skills or want to know more about it, you are welcome to follow the industry information channel, thank you for reading!

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