express框架连接mysql

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

const app = express();
const port = 3000;

// 创建 MySQL 连接池
const pool = mysql.createPool({
  host: 'localhost',
  user: 'your_username',
  password: 'your_password',
  database: 'your_database',
  connectionLimit: 10 // 连接池最大连接数
});

// 连接数据库
pool.getConnection((err, connection) => {
  if (err) {
    console.error('Error connecting to MySQL:', err);
    return;
  }
  console.log('Connected to MySQL database!');
  connection.release(); // 释放连接
});

// 示例路由：获取所有用户
app.get('/users', (req, res) => {
  pool.query('SELECT * FROM users', (err, results) => {
    if (err) {
      console.error('Error executing query:', err);
      res.status(500).send('Internal Server Error');
      return;
    }
    res.json(results);
  });
});

app.listen(port, () => {
  console.log(`Server is running on http://localhost:${port}`);
});