HSETNX

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.

Examples #

HSETNX myhash field "Hello"
HSETNX myhash field "World"
HGET myhash field