使用MongoDB和Nodejs创建嵌套的子文档/子元素

npm install mongodb

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

async function main() {
  const uri = 'your_mongodb_connection_string';
  const client = new MongoClient(uri, { useNewUrlParser: true, useUnifiedTopology: true });

  try {
    await client.connect();
    const database = client.db('your_database_name');
    const collection = database.collection('your_collection_name');

    // 创建嵌套的子文档
    const document = {
      name: 'John Doe',
      age: 30,
      address: {
        street: '123 Main St',
        city: 'Anytown',
        zip: '12345'
      },
      hobbies: ['reading', 'traveling']
    };

    // 插入文档
    const result = await collection.insertOne(document);
    console.log(`Inserted document with _id: ${result.insertedId}`);
  } finally {
    await client.close();
  }
}

main().catch(console.error);

// 查询嵌套子文档
const query = { 'address.city': 'Anytown' };
const result = await collection.find(query).toArray();
console.log(result);

// 更新嵌套子文档
const updateQuery = { name: 'John Doe' };
const updateDoc = { $set: { 'address.city': 'Newtown' } };
const updateResult = await collection.updateOne(updateQuery, updateDoc);
console.log(`Matched ${updateResult.matchedCount} documents and updated ${updateResult.modifiedCount} documents.`);

// 创建索引
const indexName = await collection.createIndex({ 'address.city': 1 });
console.log(`Created index ${indexName} on address.city`);