如何在node.js中使用mongodb？

npm install mongodb

const MongoClient = require('mongodb').MongoClient;

const url = 'mongodb://localhost:27017/mydatabase';

MongoClient.connect(url, function(err, client) {
  if (err) throw err;
  console.log('Connected to MongoDB');

  // 在这里执行数据库操作
});

const db = client.db('mydatabase');
const collection = db.collection('mycollection');

const data = { name: 'John', age: 30 };

collection.insertOne(data, function(err, result) {
  if (err) throw err;
  console.log('Data inserted');
  client.close();
});

const db = client.db('mydatabase');
const collection = db.collection('mycollection');

collection.find({ name: 'John' }).toArray(function(err, result) {
  if (err) throw err;
  console.log(result);
  client.close();
});

const db = client.db('mydatabase');
const collection = db.collection('mycollection');

const query = { name: 'John' };
const newData = { $set: { age: 35 } };

collection.updateOne(query, newData, function(err, result) {
  if (err) throw err;
  console.log('Data updated');
  client.close();
});

const db = client.db('mydatabase');
const collection = db.collection('mycollection');

const query = { name: 'John' };

collection.deleteOne(query, function(err, result) {
  if (err) throw err;
  console.log('Data deleted');
  client.close();
});

client.close();