express使用mysql

const express = require('express');
const mysql = require('mysql');

// 创建 MySQL 连接
const db = mysql.createConnection({
  host: 'localhost',
  user: 'your_username',
  password: 'your_password',
  database: 'your_database'
});

// 连接到 MySQL
db.connect((err) => {
  if (err) {
    throw err;
  }
  console.log('Connected to MySQL database');
});

const app = express();

// 定义一个路由来查询数据库
app.get('/users', (req, res) => {
  const sql = 'SELECT * FROM users';
  db.query(sql, (err, result) => {
    if (err) {
      res.status(500).send('Server error');
      return;
    }
    res.json(result);
  });
});

// 启动服务器
app.listen(3000, () => {
  console.log('Server is running on port 3000');
});