支持promises的node.js原生mongodb连接

const { MongoClient } = require('mongodb');

async function connectToMongoDB() {
  const uri = 'mongodb://localhost:27017'; // MongoDB连接字符串
  const client = new MongoClient(uri);

  try {
    await client.connect(); // 连接数据库

    const database = client.db('mydb'); // 获取数据库实例
    const collection = database.collection('mycollection'); // 获取集合实例

    // 执行查询操作
    const query = { name: 'John' };
    const result = await collection.findOne(query);
    console.log(result);

    // 执行插入操作
    const document = { name: 'Jane', age: 25 };
    const insertResult = await collection.insertOne(document);
    console.log(insertResult);

    // 执行更新操作
    const updateQuery = { name: 'John' };
    const updateDocument = { $set: { age: 30 } };
    const updateResult = await collection.updateOne(updateQuery, updateDocument);
    console.log(updateResult);

    // 执行删除操作
    const deleteQuery = { name: 'Jane' };
    const deleteResult = await collection.deleteOne(deleteQuery);
    console.log(deleteResult);
  } catch (error) {
    console.error('Error:', error);
  } finally {
    await client.close(); // 关闭数据库连接
  }
}

connectToMongoDB();