你可以在Redis中使hashKey的键值对失效吗？ [英] Can you expire a key value pair for a hashKey in Redis

问题描述

我想在redis中使用hashKey中的特定键/值对设置到期。但redis会使整个hashKey失效，并且所有keyValue对都会丢失。例如，我只想从seqNu中删除Key：666。使用jedis.setex是另一种选择，但你不能在其中设置hashKey。

I want to expire a particular key/value pair set in a hashKey in redis. But redis expires the whole hashKey with all keyValue pairs inside lost. For example i just want to remove Key:666 from seqNu. Using jedis.setex is other option but u cant set a hashKey in it.

jedis.hset("seqNu","666",System.currentTimeMillis()+"");
jedis.hset("seqNu","777",System.currentTimeMillis()+"");
jedis.expire("seqNu", 20); // This expires the whole HashKey: seqNu after 20 seconds 

推荐答案

Redis只会使整个键到期，而不是其数据结构中的单个元素（即Hash字段或Set的成员）。考虑将Hash拆分为多个字符串键（每个键都可以自行删除）或使用排序集，如下所述： Redis：设置设置中键值对的超时时间

Redis only expires "whole" keys, not individual elements inside its data structures (i.e.g. a Hash's field or a Set's member). Consider splitting your Hash into multiple string keys (each expirable by itself) or using Sorted Sets as explained here: Redis: To set timeout for a key value pair in Set

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