如何将Node.js驱动程序格式的MongoDB查询转换为Mongoose格式

const mongoose = require('mongoose');

mongoose.connect('mongodb://localhost/mydatabase', {
  useNewUrlParser: true,
  useUnifiedTopology: true,
});

const mongoose = require('mongoose');

const userSchema = new mongoose.Schema({
  name: String,
  age: Number,
  email: String,
});

const User = mongoose.model('User', userSchema);

const User = mongoose.model('User');

// 查询所有用户
User.find({}, (err, users) => {
  if (err) {
    console.error(err);
  } else {
    console.log(users);
  }
});

// 查询年龄大于等于18的用户
User.find({ age: { $gte: 18 } }, (err, users) => {
  if (err) {
    console.error(err);
  } else {
    console.log(users);
  }
});

const User = mongoose.model('User');

// 更新年龄小于18的用户的邮箱
User.updateMany({ age: { $lt: 18 } }, { email: 'updated@example.com' }, (err, result) => {
  if (err) {
    console.error(err);
  } else {
    console.log(result);
  }
});

const User = mongoose.model('User');

// 删除年龄大于等于30的用户
User.deleteMany({ age: { $gte: 30 } }, (err, result) => {
  if (err) {
    console.error(err);
  } else {
    console.log(result);
  }
});