redis HLEN command

length

英[leŋθ] 美[leŋθ]

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

Plural: lengths

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