Redis

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:

Examples

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