如何在Node中查找Mongo的第一个结果

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

// 连接MongoDB数据库
MongoClient.connect('mongodb://localhost:27017', (err, client) => {
  if (err) {
    console.error('Failed to connect to MongoDB:', err);
    return;
  }

  // 选择数据库和集合
  const db = client.db('mydb');
  const collection = db.collection('mycollection');

  // 查询第一个结果
  collection.findOne({}, (err, result) => {
    if (err) {
      console.error('Failed to find document:', err);
      return;
    }

    console.log('First result:', result);
    client.close();
  });
});

const mongoose = require('mongoose');

// 连接MongoDB数据库
mongoose.connect('mongodb://localhost/mydb', { useNewUrlParser: true, useUnifiedTopology: true })
  .then(() => {
    console.log('Connected to MongoDB');

    // 定义数据模型
    const schema = new mongoose.Schema({
      name: String,
      age: Number
    });
    const Model = mongoose.model('Person', schema);

    // 查询第一个结果
    Model.findOne({}, (err, result) => {
      if (err) {
        console.error('Failed to find document:', err);
        return;
      }

      console.log('First result:', result);
      mongoose.disconnect();
    });
  })
  .catch((err) => {
    console.error('Failed to connect to MongoDB:', err);
  });