Sets the value of a field in a hash only when the field doesn't exist.
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.
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"
One of the following:
0 if the field already exists in the hash and no operation was performed.1 if the field is a new field in the hash and the value was set.One of the following:
0 if the field already exists in the hash and no operation was performed.1 if the field is a new field in the hash and the value was set.
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