nodejs写增删改查

news/2024/4/20 21:08:30/文章来源:https://blog.csdn.net/weixin_45506717/article/details/131724887

以下是一个使用Node.js进行增删改查的示例代码:

const express = require('express');
const bodyParser = require('body-parser');
const mongoose = require('mongoose');// 创建Express应用程序
const app = express();
app.use(bodyParser.json());// 链接MongoDB数据库
mongoose.connect('mongodb://localhost:27017/mydatabase', {useNewUrlParser: true,useUnifiedTopology: true
}).then(() => {console.log('MongoDB数据库已连接');}).catch((error) => {console.error('MongoDB数据库连接失败', error);});// 定义数据模型
const TodoSchema = new mongoose.Schema({title: String,completed: Boolean
});const Todo = mongoose.model('Todo', TodoSchema);// 添加Todo
app.post('/todos', (req, res) => {const { title, completed } = req.body;const todo = new Todo({title,completed});todo.save().then(() => {res.status(201).json({ message: 'Todo已添加' });}).catch((error) => {res.status(500).json({ message: '添加Todo时发生错误', error: error });});
});// 获取所有Todos
app.get('/todos', (req, res) => {Todo.find().then((todos) => {res.status(200).json(todos);}).catch((error) => {res.status(500).json({ message: '获取Todos时发生错误', error: error });});
});// 获取单个Todo
app.get('/todos/:id', (req, res) => {const id = req.params.id;Todo.findById(id).then((todo) => {if (todo) {res.status(200).json(todo);} else {res.status(404).json({ message: '找不到该Todo' });}}).catch((error) => {res.status(500).json({ message: '获取Todo时发生错误', error: error });});
});// 更新Todo
app.put('/todos/:id', (req, res) => {const id = req.params.id;const { title, completed } = req.body;Todo.findByIdAndUpdate(id, { title, completed }).then((todo) => {if (todo) {res.status(200).json({ message: 'Todo已更新' });} else {res.status(404).json({ message: '找不到该Todo' });}}).catch((error) => {res.status(500).json({ message: '更新Todo时发生错误', error: error });});
});// 删除Todo
app.delete('/todos/:id', (req, res) => {const id = req.params.id;Todo.findByIdAndDelete(id).then((todo) => {if (todo) {res.status(200).json({ message: 'Todo已删除' });} else {res.status(404).json({ message: '找不到该Todo' });}}).catch((error) => {res.status(500).json({ message: '删除Todo时发生错误', error: error });});
});// 启动服务器
app.listen(3000, () => {console.log('服务器已启动');
});