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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 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​

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