使用mongoose将大量文档导出为文本文件

npm install mongoose fs

const mongoose = require('mongoose');
const fs = require('fs');

mongoose.connect('mongodb://localhost:27017/mydatabase', { useNewUrlParser: true, useUnifiedTopology: true })
  .then(() => {
    console.log('Connected to MongoDB');
  })
  .catch((error) => {
    console.error('Error connecting to MongoDB', error);
  });

const documentSchema = new mongoose.Schema({
  title: String,
  content: String,
  // 其他字段...
});

const Document = mongoose.model('Document', documentSchema);

Document.find({})
  .then((documents) => {
    let text = '';
    documents.forEach((document) => {
      text += `Title: ${document.title}\nContent: ${document.content}\n\n`;
    });

    fs.writeFile('exported_documents.txt', text, (error) => {
      if (error) {
        console.error('Error exporting documents', error);
      } else {
        console.log('Documents exported successfully');
      }
    });
  })
  .catch((error) => {
    console.error('Error querying documents', error);
  });

mongoose.connection.close();