Mongoose使用方法将模式添加到模式中

npm install mongoose

const mongoose = require('mongoose');

const Schema = mongoose.Schema;

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

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

const user = new User({
  name: 'John',
  age: 25,
  email: 'john@example.com'
});

user.save(function(err) {
  if (err) {
    console.error(err);
  } else {
    console.log('User created successfully.');
  }
});

User.find({ name: 'John' }, function(err, users) {
  if (err) {
    console.error(err);
  } else {
    console.log(users);
  }
});

User.updateOne({ name: 'John' }, { age: 26 }, function(err) {
  if (err) {
    console.error(err);
  } else {
    console.log('User updated successfully.');
  }
});

User.deleteOne({ name: 'John' }, function(err) {
  if (err) {
    console.error(err);
  } else {
    console.log('User deleted successfully.');
  }
});