Node.js中的Mongodb查询

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

async function run() {
  const uri = "mongodb://localhost:27017";
  const client = new MongoClient(uri);

  try {
    await client.connect();
    const database = client.db('mydb');
    const collection = database.collection('mycollection');

    // 插入一个文档
    const insertResult = await collection.insertOne({ name: 'Alice', age: 25 });
    console.log(`Inserted document with _id: ${insertResult.insertedId}`);

    // 查询所有文档
    const findResult = await collection.find({}).toArray();
    console.log('Found documents:', findResult);

    // 更新一个文档
    const updateResult = await collection.updateOne(
      { name: 'Alice' },
      { $set: { age: 26 } }
    );
    console.log(`Matched ${updateResult.matchedCount} document(s) and modified ${updateResult.modifiedCount} document(s)`);

    // 删除一个文档
    const deleteResult = await collection.deleteOne({ name: 'Alice' });
    console.log(`Deleted ${deleteResult.deletedCount} document(s)`);

  } finally {
    await client.close();
  }
}

run().catch(console.dir);