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Redis Related dictionaries

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redis HLEN command

Chinese translationRecent Updates：2018-05-16 10:55:05

length

英[leŋθ] 美[leŋθ]

n.Length, long; the length of time; (language) sound length; a paragraph, a section

Plural: lengths

redis HLEN command Video explanation

redis HLEN command syntax

Function: Returns the number of fields in the hash table key.

Syntax: HLEN key

Time complexity: O(1)

Return: The number of fields in the hash table. When key does not exist, return 0.

redis HLEN command example

redis> HSET db redis redis.com
(integer) 1
redis> HSET db mysql mysql.com
(integer) 1
redis> HLEN db
(integer) 2
redis> HSET db mongodb mongodb.org
(integer) 1
redis> HLEN db
(integer) 3

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