如何使用统一拓扑和Promises从NodeJS连接到MongoDB

npm install mongodb

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

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

MongoClient.connect(url)
  .then((client) => {
    console.log('Connected to MongoDB');
    // 在这里执行数据库操作
    client.close();
  })
  .catch((error) => {
    console.error('Failed to connect to MongoDB', error);
  });

MongoClient.connect(url)
  .then((client) => {
    console.log('Connected to MongoDB');
    const db = client.db();
    // 执行数据库操作
    db.collection('users').insertOne({ name: 'John' })
      .then((result) => {
        console.log('User inserted:', result.insertedId);
      })
      .catch((error) => {
        console.error('Failed to insert user', error);
      })
      .finally(() => {
        client.close();
      });
  })
  .catch((error) => {
    console.error('Failed to connect to MongoDB', error);
  });