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PTTL key

自2.6.0起可用。

时间复杂度: O(1)

与 TTL 类似,这个命令返回一个有效期的密钥的剩余时间,唯一不同的是 TTL 返回以毫秒为单位的剩余时间,以毫秒为单位。

在 Redis 2.6或更高版本中,-1如果密钥不存在或者密钥存在但没有关联到期,则该命令将返回。

从 Redis 2.8开始,错误发生时的返回值发生了变化:

  • -2如果该键不存在,则该命令返回。

  • -1如果密钥存在但没有关联过期,则该命令返回。

返回值

整数回复:TTL以毫秒为单位,或者为负值以指示错误(请参阅上述说明)。

例子

redis>  SET mykey "Hello" "OK" 

redis>  EXPIRE mykey 1 (integer) 1 

redis>  PTTL mykey (integer) 999

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