Node. js mongodb Operations Learning Summary

Node. js mongodb Operations Learning Summary

 Node. js mongodb Operations Learning Summary

This article mainly introduces the learning Summary of node. js operations on mongodb. This article provides code instances for mongodb to create databases, insert data, connect to the mongodb database, and query data. For more information, see

　　I. Preparations

1. Create a table to be read in mongodb

Create a database named Test

The Code is as follows:

Use extension test;

Insert data to the user table

The Code is as follows:

Db. user. insert ({

Name: 'flyoung ',

Age: '18 ',

Sex: true

});

2. Install node-mongodb-native

The Code is as follows:

Npm install mongodb

　Ii. instance (node. js reads mongodb)

See node-mongodb-native documentation: https://github.com/mongodb/node-mongodb-native

The Code is as follows:

Var mongodb = require ('mongodb ');

Var server = new mongodb. Server ("127.0.0.1", 27017, {}); // local port 27017

New mongodb. Db ('mongotest', server, {}). open (function (error, client) {// Database: mongotest

If (error) throw error;

Var collection = new mongodb. Collection (client, 'user'); // table: user

Collection. find (function (error, cursor ){

Cursor. each (function (error, doc ){

If (doc ){

Console. log ("name:" + doc. name + "age:" + doc. age );

}

});

});

});

Run:

The Code is as follows:

Node mongodbTest. js

Result:

The Code is as follows:

Name: flyoung age: 18

　　Iii. Last words

Demo reference document for adding, deleting, modifying, and querying