如何在Node.js中为MongoClient方法构造Promise包装器

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

function connect(url, options) {
  return new Promise((resolve, reject) => {
    MongoClient.connect(url, options, (err, client) => {
      if (err) {
        reject(err);
      } else {
        resolve(client);
      }
    });
  });
}

function insertOne(client, collectionName, document) {
  return new Promise((resolve, reject) => {
    const db = client.db();
    const collection = db.collection(collectionName);
    collection.insertOne(document, (err, result) => {
      if (err) {
        reject(err);
      } else {
        resolve(result);
      }
    });
  });
}

// 使用示例
connect('mongodb://localhost:27017', { useNewUrlParser: true })
  .then(client => {
    console.log('Connected to MongoDB');
    return insertOne(client, 'myCollection', { name: 'John' });
  })
  .then(result => {
    console.log('Document inserted:', result);
  })
  .catch(err => {
    console.error('Error:', err);
  });