查Mysql返回json

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npm install mysql --save

不使用框架

const http = require('http');
const mysql = require('mysql');
 
// 创建 MySQL 连接
const connection = mysql.createConnection({
  host     : 'localhost',
  user     : 'root',
  password : 'root',
  database : 'db_devops'
});
 
// 连接到 MySQL
connection.connect();
 
// 设置 HTTP 服务器
http.createServer((req, res) => {
  if (req.method === 'GET') {
    // 执行 SQL 查询
    connection.query('SELECT * FROM student', (error, results, fields) => {
      if (error) throw error;
 
      // 将结果转换为 JSON 并发送响应
      res.setHeader('Content-Type', 'application/json');
      res.end(JSON.stringify(results));
    });
  }
}).listen(1235, () => {
  console.log('Server is running');
});

使用express框架

const express = require('express');
const mysql = require('mysql');
 
// 配置MySQL连接
const connection = mysql.createConnection({
  host     : 'localhost',
  user     : 'root',
  password : 'root',
  database : 'db_devops'
});
 
// 连接MySQL
connection.connect();
 
const app = express();
const port = 3000;
 
// 查询数据的API
app.get('/api/data', (req, res) => {
  const sql = 'SELECT * FROM student';
  connection.query(sql, (error, results, fields) => {
    if (error) throw error;
    res.json(results); // 将查询结果以JSON格式返回
  });
});
 
// 启动服务器
app.listen(port, () => {
  console.log(`Server is running on port ${port}`);
});

读写Redis

npm install redis --save

示例：

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