HSETNX key field value

Available since: 2.0.0

Time complexity: O(1)

ACL categories: @write @hash @fast

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 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.

@examples

redis> HSETNX myhash field "Hello"
TBD
redis> HSETNX myhash field "World"
TBD
redis> HGET myhash field