Node.js和Python进行连接与操作MongoDB的全面指南

npm install mongodb

const { MongoClient } = require('mongodb');
 
const uri = 'mongodb://localhost:27017';
const client = new MongoClient(uri);
 
async function run() {
  try {
    await client.connect();
    const db = client.db('mydb');
    const collection = db.collection('users');
 
    // 插入数据
    await collection.insertOne({ name: 'Alice', age: 25 });
 
    // 查询数据
    const users = await collection.find({ age: { $gt: 20 } }).toArray();
    console.log(users);
  } finally {
    await client.close();
  }
}
 
run().catch(console.error);

npm install mongoose

const mongoose = require('mongoose');
 
// 连接数据库
mongoose.connect('mongodb://localhost:27017/mydb');
 
// 定义Schema
const UserSchema = new mongoose.Schema({
  name: { type: String, required: true },
  age: { type: Number, default: 18 }
});
 
// 定义Model
const User = mongoose.model('User', UserSchema);
 
// 插入数据
const user = new User({ name: 'Bob' });
await user.save();
 
// 查询数据
const users = await User.find({ age: { $gte: 20 } });
console.log(users);

pip install pymongo

from pymongo import MongoClient
 
client = MongoClient("mongodb://localhost:27017/")
db = client["mydb"]
collection = db["users"]
 
# 插入数据
collection.insert_one({"name": "Charlie", "age": 30})
 
# 查询数据
users = collection.find({"age": {"$gt": 20}})
for user in users:
    print(user)

pip install motor

import asyncio
from motor.motor_asyncio import AsyncIOMotorClient
 
async def main():
    client = AsyncIOMotorClient("mongodb://localhost:27017")
    db = client["mydb"]
    collection = db["users"]
 
    # 插入数据
    await collection.insert_one({"name": "Dave", "age": 28})
 
    # 查询数据
    async for user in collection.find({"age": {"$gt": 25}}):
        print(user)
 
asyncio.run(main())

// 创建索引
await collection.createIndex({ name: 1 }, { unique: true });
 
// 查看索引
const indexes = await collection.listIndexes().toArray();
console.log(indexes);

# 创建索引
collection.create_index([("name", pymongo.ASCENDING)], unique=True)
 
# 查看索引
for index in collection.list_indexes():
    print(index)

const result = await collection.aggregate([
  { $match: { age: { $gt: 20 } } },
  { $group: { _id: "$name", total: { $sum: 1 } } }
]).toArray();

result = collection.aggregate([
    {"$match": {"age": {"$gt": 20}}},
    {"$group": {"_id": "$name", "total": {"$sum": 1}}}
])