测试协同管理工具年末活动

-- 创建索引以提高查询效率
CREATE INDEX idx_user_id ON user_table(user_id);

-- 使用缓存机制减少数据库访问次数
const cache = require('memory-cache');

function getUserInfo(userId) {
    let userInfo = cache.get(`user_${userId}`);
    if (!userInfo) {
        userInfo = db.query(`SELECT * FROM user_table WHERE user_id = ${userId}`);
        cache.put(`user_${userId}`, userInfo, duration * 1000); // duration为缓存时长（秒）
    }
    return userInfo;
}

const db = require('database_connection');

async function updateUserBalance(userId, amount) {
    const transaction = await db.startTransaction();
    try {
        await db.execute(`UPDATE user_table SET balance = balance + ${amount} WHERE user_id = ${userId}`, { transaction });
        await transaction.commit();
    } catch (error) {
        await transaction.rollback();
        throw error;
    }
}