如何使用node js在mongo db中查找数据库

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

const url = 'mongodb://localhost:27017'; // MongoDB数据库的URL
const dbName = 'mydatabase'; // 数据库名称

MongoClient.connect(url, function(err, client) {
  if (err) {
    console.error('Failed to connect to MongoDB:', err);
    return;
  }

  const db = client.db(dbName);
  // 在这里执行数据库操作
});

const collection = db.collection('users');

collection.find({}).toArray(function(err, docs) {
  if (err) {
    console.error('Failed to find documents:', err);
    return;
  }

  console.log('Found documents:', docs);
});

const collection = db.collection('users');

collection.find({ age: { $gte: 18 } }).sort({ age: -1 }).toArray(function(err, docs) {
  if (err) {
    console.error('Failed to find documents:', err);
    return;
  }

  console.log('Found documents:', docs);
});