- Usage:
-
HSETNX key field value
- Complexity:
- O(1)
- Since:
- 2.0.0
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
127.0.0.1:6379> HSETNX myhash field "Hello"
(integer) 1
127.0.0.1:6379> HSETNX myhash field "World"
(integer) 0
127.0.0.1:6379> HGET myhash field
"Hello"