HSETNX key field value

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 value

Integer reply, specifically:

  • 1 if field is a new field in the hash and value was set.
  • 0 if field already exists in the hash and no operation was performed.


redis>  HSETNX myhash field "Hello"
(integer) 1
redis>  HSETNX myhash field "World"
(integer) 0
redis>  HGET myhash field