js函数操作数据库

npm install mongodb

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

async function main() {
    // 数据库连接URL
    const url = 'mongodb://localhost:27017';
    // 数据库名称
    const dbName = 'myDatabase';

    // 创建一个MongoClient实例
    const client = new MongoClient(url);

    try {
        // 连接到MongoDB
        await client.connect();
        console.log('Connected successfully to server');

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

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

        // 查询文档
        const findResult = await collection.find({ name: 'Alice' }).toArray();
        console.log('Found documents: ', findResult);

        // 更新文档
        const updateResult = await collection.updateOne(
            { name: 'Alice' },
            { $set: { age: 26 } }
        );
        console.log('Matched count: ', updateResult.matchedCount, 'Modified count: ', updateResult.modifiedCount);

        // 删除文档
        const deleteResult = await collection.deleteOne({ name: 'Alice' });
        console.log('Deleted count: ', deleteResult.deletedCount);
    } catch (err) {
        console.error('Error:', err);
    } finally {
        // 关闭连接
        await client.close();
    }
}

main().catch(console.error);