HSETNX
Syntax
HSETNX key field value
Time complexity: O(1)
Sets field
in the hash stored at key
to value
, only if field
does not
yet exist.
If key
does not exist, a new key holding a hash is created.
If field
already exists, this operation has no effect.
Return
Integer reply, specifically:
1
iffield
is a new field in the hash andvalue
was set.0
iffield
already exists in the hash and no operation was performed.
Examples
dragonfly> HSETNX myhash field "Hello"
(integer) 1
dragonfly> HSETNX myhash field "World"
(integer) 0
dragonfly> HGET myhash field
"Hello"