nodejs+mysql实现用户相关的增删改查的详细操作

目录

• 1.使用npm进行初始化
•  2. 安装 expres包和myslq依赖包
• 3.项目架构
•  3.1 在项目的根目录下创建app.js
• 3.2 创建models文件夹，包含所有数据库层面的方法
• 3.2.1 创建db.js，配置数据库
• 3.2.2创建 models/userModel.js ，编写用户的新增、修改、删除、查询相关的mysql实现
• 3.3 创建请求处理的controller
• 3.4编写路由文件
• 4.启动项目
• 5.调试项目

const express = require('express')
const router = require('./routes/router')
const app = express()
app.use(express.json())
app.use('/users', router)
app.listen(3000, () => {
  console.log('Server started on port 3000')
})

const mysql = require('mysql2')
const pool = mysql.createPool({
  host: 'localhost',
  user: 'root',
  password: 'password',
  database: 'test_db',
  waitForConnections: true,
  connectionLimit: 10,
  queueLimit: 0
})
module.exports = pool

const pool = require('./db')
function getAllUsers() {
  return new Promise((resolve, reject) => {
    pool.query('SELECT * FROM users', (err, rows) => {
      if (err) {
        reject(err)
      } else {
        resolve(rows)
      }
    })
  })
}
function getUserById(id) {
  return new Promise((resolve, reject) => {
    pool.query('SELECT * FROM users WHERE id = ?', [id], (err, rows) => {
      if (err) {
        reject(err)
      } else {
        resolve(rows[0])
      }
    })
  })
}
function createUser(user) {
  return new Promise((resolve, reject) => {
    pool.query('INSERT INTO users SET ?', user, (err, result) => {
      if (err) {
        reject(err)
      } else {
        resolve(result.insertId)
      }
    })
  })
}
function updateUser(id, user) {
  return new Promise((resolve, reject) => {
    pool.query('UPDATE users SET ? WHERE id = ?', [user, id], (err, result) => {
      if (err) {
        reject(err)
      } else {
        resolve(result.affectedRows)
      }
    })
  })
}
function deleteUser(id) {
  return new Promise((resolve, reject) => {
    pool.query('DELETE FROM users WHERE id = ?', [id], (err, result) => {
      if (err) {
        reject(err)
      } else {
        resolve(result.affectedRows)
      }
    })
  })
}
module.exports = {
  getAllUsers,
  getUserById,
  createUser,
  updateUser,
  deleteUser
}

const userModel = require('../models/userModel')
async function getAllUsers(req, res) {
  try {
    const users = await userModel.getAllUsers()
    res.json(users)
  } catch (err) {
    console.error(err)
    res.sendStatus(500)
  }
}
async function getUserById(req, res) {
  try {
    const user = await userModel.getUserById(req.params.id)
    if (user) {
      res.json(user)
    } else {
      res.sendStatus(404)
    }
  } catch (err) {
    console.error(err)
    res.sendStatus(500)
  }
}
async function createUser(req, res) {
  try {
    const id = await userModel.createUser(req.body)
    res.json({ id })
  } catch (err) {
    console.error(err)
    res.sendStatus(500)
  }
}
async function updateUser(req, res) {
  try {
    const rowsAffected = await userModel.updateUser(req.params.id, req.body)
    if (rowsAffected) {
      res.sendStatus(204)
    } else {
      res.sendStatus(404)
    }
  } catch (err) {
    console.error(err)
    res.sendStatus(500)
  }
}
async function deleteUser(req, res) {
  try {
    const rowsAffected = await userModel.deleteUser(req.params.id)
    if (rowsAffected) {
      res.sendStatus(204)
    } else {
      res.sendStatus(404)
    }
  } catch (err) {
    console.error(err)
    res.sendStatus(500)
  }
}
module.exports = {
  getAllUsers,
  getUserById,
  createUser,
  updateUser,
  deleteUser
}

const express = require('express')
const router = express.Router()
const userController = require('../controllers/userController')
router.get('/getAllUsers', userController.getAllUsers)
router.get('/getUserById/:id', userController.getUserById)
router.post('/createUser', userController.createUser)
router.put('/updateUser/:id', userController.updateUser)
router.delete('/deleteUser/:id', userController.deleteUser)
module.exports = router

node app.js

node inspect app.js