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.
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.(integer) 1 redis> HSETNX myhash field "World" (integer) 0 redis> HGET myhash field "Hello"
© 2009–2020 Salvatore Sanfilippo
Licensed under the Creative Commons Attribution-ShareAlike License 4.0.
https://redis.io/commands/hsetnx