MSETNX key value

Syntax

MSETNX key1 value1 key2 value2 ... keyN valueN

    Sets keys to values if key is not exist. It will not perform any operation at all even if just a single key already exists.

Returns

1 if the all the keys were set.

0 if no key set.

127.0.0.1:6379> msetnx x 10 y 11 z 12 
(integer) 1 
127.0.0.1:6379> msetnx b 11 x 12 
(integer) 0 
127.0.0.1:6379> mget x y z  b 
1) "10" 
2) "11" 
3) "12" 
4) (nil) 

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