hlen
HLEN
HLEN key
Returns the number of fields contained in the hash stored at key.
Return value
Integer reply: number of fields in the hash, or 0 when key does not exist.
Examples
redis> HSET myhash field1 "Hello"
(integer) 1 redis> HSET myhash field2 "World" (integer) 1 redis> HLEN myhash (integer) 2
