为Redis中的Hashmap值设置过期时间? | 为Redis中的Hashmap值设置过期时间

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问题描述

如何像使用 SETX 为常规值设置 Redis 中的哈希映射一样设置到期时间.我想为我为其存储 hasmap 的会话提供 TTL.我可以使用 SETEX 本身创建一个 Hashmap 吗?

How do I set expiry for hashmaps in Redis like I do for regular values using SETX.I want to provide TTL for a session for which I am storing a hasmap.Can I create a Hashmap using SETEX itself ?

推荐答案

不，你不能用 SETEX(它是一个字符串方法)创建哈希.您可以对散列键调用 EXPIRE ，但这将使整个散列过期.目前不支持单个哈希键/值对过期.

No, you can't create hash with SETEX (which is a strings methods). You can call EXPIRE on hash key, but that will expire the whole hash. There's no support at the moment for expiration of individual hash key/value pairs.

如果您想在设置单个元素的同时设置整个哈希的过期时间，可以通过多种方式实现.

If you wanted to set expiration on the whole hash while setting its individual elements, you can achieve that in several ways.

使用流水线.流水线是一种特殊的操作模式，redis 客户端快速连续地发出几个命令，而不是等待回复发送下一个.这是 ruby 中的一个示例:

Use pipelining. Pipelining is a special mode of operation where redis client issues several commands in quick succession, not waiting for a reply to send next one. Here's an example in ruby:

redis.pipelined do
  redis.hset "foo", "bar", 1
  redis.expire "foo", 300
end

使用事务.没有被监视的键，这类似于流水线操作(因为事务不能中止).保证命令一起运行并以原子方式运行(多个管道可以交错运行，事务被序列化)

Use transactions. Without watched keys this is similar to pipelining (for a transaction can't abort). The commands are guaranteed to run together and atomically (several pipelines can run interleaved, transactions are serialized)

redis.multi do
  redis.hset "foo", "bar", 1
  redis.expire "foo", 300
end

使用 lua 脚本来实现您的自定义 HSETEX 命令.它将以原子方式执行，您只需发送一个命令(而不是 2(流水线)或 4(事务)).

Use lua scripting to implement your custom HSETEX command. It will be executed atomically and you just have to send one command (instead of 2(pipelining) or 4 (transaction)).

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