如何在nodejs中通过上传CSV文件一次添加多个用户？

const express = require('express');
const multer = require('multer');
const csv = require('fast-csv');
const fs = require('fs');
const app = express();
const upload = multer({ dest: 'uploads/' });

app.post('/upload-users', upload.single('file'), (req, res) => {
  if (!req.file) {
    return res.status(400).send('No file uploaded.');
  }

  const filePath = req.file.path;
  const users = [];

  fs.createReadStream(filePath)
    .pipe(csv.parse({ headers: true }))
    .on('data', (data) => {
      users.push(data);
    })
    .on('end', () => {
      // 处理用户数据并存储到数据库
      saveUsersToDatabase(users)
        .then(() => {
          res.status(200).send('Users added successfully.');
        })
        .catch((err) => {
          res.status(500).send(`Error adding users: ${err.message}`);
        });
    });
});

async function saveUsersToDatabase(users) {
  // 这里使用假设的数据库操作函数
  for (const user of users) {
    // 假设的数据库插入操作
    await insertUserToDatabase(user);
  }
}

function insertUserToDatabase(user) {
  // 这里实现数据库插入逻辑
  // 例如使用MongoDB或MySQL的驱动程序
  return new Promise((resolve, reject) => {
    // 模拟数据库插入操作
    setTimeout(() => {
      console.log(`User inserted: ${JSON.stringify(user)}`);
      resolve();
    }, 100);
  });
}

app.listen(3000, () => {
  console.log('Server is running on port 3000');
});