HSETNX

Syntax

HSETNX key field value

Time complexity: O(1)

ACL categories: @read, @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

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