如何用redis防并发，抢红包买东西这种并发
如何用redis防并发，抢红包买东西这种并发。最好能附代码 谢谢
回复讨论(解决方案)
原则是：先插入，后检查有效性
代码就不写了，不知道你的 redis 是否支持并发
原则是：先插入，后检查有效性
代码就不写了，不知道你的 redis 是否支持并发
支持并发。是这样的，先往redis插key，如果存在key就自增。然后把这个队列插入数据库。
还一种方式，抢购这种，先读缓存总数，然后递减
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