在服务模拟中获取查询参数

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

app.get('/search', (req, res) => {
  const query = req.query.q;
  res.send(`Search results for: ${query}`);
});

app.listen(3000, () => {
  console.log('Server running on port 3000');
});

from flask import Flask, request

app = Flask(__name__)

@app.route('/search')
def search():
    query = request.args.get('q', '')
    return f'Search results for: {query}'

if __name__ == '__main__':
    app.run(port=3000)

import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;

@RestController
public class SearchController {

    @GetMapping("/search")
    public String search(@RequestParam String q) {
        return "Search results for: " + q;
    }
}

app.get('/search', (req, res) => {
  const query = req.query.q;
  if (!query) {
    return res.status(400).send('Query parameter "q" is required');
  }
  res.send(`Search results for: ${query}`);
});

app.get('/search', (req, res) => {
  const page = parseInt(req.query.page, 10);
  if (isNaN(page)) {
    return res.status(400).send('Query parameter "page" must be a number');
  }
  res.send(`Results for page: ${page}`);
});

// 使用参数化查询
const query = 'SELECT * FROM users WHERE username = ?';
db.query(query, [req.query.username], (err, results) => {
  // 处理结果
});