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HSETNX

Sets the string value of a hash field, only if the field does not already exist.

Syntax​

HSETNX key field value

Details​

  • Available since: 2.0.0
  • Time complexity: O(1)
  • ACL categories: @write, @hash, @fast

Example​

Assume we have an empty hash called myhash. Now, let's set the field "field1" to "value1":

HSETNX myhash field1 "value1"

Since the field "field1" does not exist in myhash, this will output:

(integer) 1

Now, let's try to set "field1" again:

HSETNX myhash field1 "new_value"

Since "field1" already exists in myhash, this will output:

(integer) 0

RESP2/RESP3 Reply​

Integer reply: 1 if the field was set, 0 if the field already existed in the hash and no operation was performed.