MSETNX key value [ key value ...]
Available since: 1.0.1
Time complexity: O(N) where N is the number of keys to set.
ACL categories:
@write
@string
@slow
Sets the given keys to their respective values.
MSETNX will not perform any operation at all even if just a single key already
exists.
Because of this semantic MSETNX can be used in order to set different keys
representing different fields of an unique logic object in a way that ensures
that either all the fields or none at all are set.
MSETNX is atomic, so all given keys are set at once.
It is not possible for clients to see that some of the keys were updated while
others are unchanged.
Return
Integer reply, specifically:
1if the all the keys were set.0if no key was set (at least one key already existed).