如何使用mongodb数据库编写更新字段api

const express = require('express');
const MongoClient = require('mongodb').MongoClient;

const app = express();
const port = 3000;

// MongoDB连接URL和数据库名称
const url = 'mongodb://localhost:27017';
const dbName = 'mydb';

// API路由，处理更新字段的请求
app.put('/api/update', (req, res) => {
  // 解析请求参数
  const field = req.body.field;
  const value = req.body.value;
  const condition = req.body.condition;

  // 连接到MongoDB数据库
  MongoClient.connect(url, (err, client) => {
    if (err) {
      res.status(500).send('Failed to connect to database');
      return;
    }

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

    // 构建更新操作的查询条件和更新内容
    const query = { condition };
    const update = { $set: { field: value } };

    // 执行更新操作
    collection.updateOne(query, update, (err, result) => {
      if (err) {
        res.status(500).send('Failed to update document');
        return;
      }

      res.send('Document updated successfully');
    });

    client.close();
  });
});

app.listen(port, () => {
  console.log(`Server listening at http://localhost:${port}`);
});