javascript 代碼實現CRUD, 业务需求 user表, gamelist表, 賽局表，MySQL用于持久化数据，Redis用于缓存和JWT。

在JavaScript中，尤其是Node.js环境中，我们可以使用Express框架和一些数据库操作库（如mysql2和redis）来实现CRUD操作。以下是简化的示例：

首先，安装必要的依赖：

npm install express mysql2 redis jsonwebtoken body-parser cors

然后创建Express应用，并连接MySQL和Redis：

const express = require('express');
const mysql = require('mysql2/promise');
const redis = require('redis');
const jwt = require('jsonwebtoken');
const bodyParser = require('body-parser');

// MySQL配置
const mysqlConfig = {
  host: 'your_host',
  user: 'your_user',
  password: 'your_password',
  database: 'your_database'
};

// Redis配置
const redisClient = redis.createClient({
  host: 'your_redis_host',
  port: your_redis_port
});

app.use(bodyParser.json());
app.use(cors());

// 连接MySQL
async function connectToDB() {
  try {
    await mysql.createPool(mysqlConfig);
  } catch (error) {
    console.error('Error connecting to MySQL:', error);
  }
}

connectToDB();

// CRUD操作示例

// 创建用户 (Create)
app.post('/api/users', async (req, res) => {
  // 数据验证
  const { name, email } = req.body;
  
  if (!name || !email) return res.status(400).json({ error: 'Missing required fields' });

  const sql = 'INSERT INTO users (name, email) VALUES (?, ?)';
  const [result] = await pool.query(sql, [name, email]);

  // 如果成功，返回新用户的ID或JWT
  res.status(201).json(result.insertId);
});

// 查询用户列表 (Read - All)
app.get('/api/users', async (req, res) => {
  const sql = 'SELECT * FROM users';
  const [data] = await pool.query(sql);

  res.json(data);
});

// 更新用户 (Update)
app.put('/api/users/:id', async (req, res) => {
  const { id } = req.params;
  const { name, email } = req.body;

  if (!id || !name || !email) return res.status(400).json({ error: 'Invalid request data' });

  const sql = 'UPDATE users SET name = ?, email = ? WHERE id = ?';
  const result = await pool.query(sql, [name, email, id]);

  res.json({ message: 'User updated', affectedRows: result.affectedRows });
});

// 删除用户 (Delete)
app.delete('/api/users/:id', async (req, res) => {
  const { id } = req.params;

  if (!id) return res.status(400).json({ error: 'Missing user ID' });

  const sql = 'DELETE FROM users WHERE id = ?';
  const result = await pool.query(sql, [id]);

  res.json({ message: 'User deleted', affectedRows: result.affectedRows });
});

// 使用Redis作为JWT缓存
const cache = {};
app.get('/api/auth/token', async (req, res) => {
  const token = req.query.token;
  
  if (!token) return res.status(400).json({ error: 'Token not provided' });

  if (cache[token]) {
    return res.json(cache[token]);
  }

  // 实际上从数据库验证JWT并获取数据，这里仅作示例
  const jwtData = { username: 'John Doe' }; // Assume validated JWT has this data
  const decoded = jwt.verify(token, 'secret_key');
  cache[token] = decoded; // Cache the JWT for some time

  res.json(decoded);
});