HSETNX

Syntax
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

RESP2/RESP3 Reply

One of the following:

  • Integer reply: 0 if the field already exists in the hash and no operation was performed.
  • Integer reply: 1 if the field is a new field in the hash and the value was set.

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