+
+ 
+
+
+
+
+
+
+
+
+
+ HsetnxCommand
+ +
+
+
+
+
+
+
+
+ HSETNX _key_ _field_ _value_ (Redis >
1.3.10)= +Time complexity: O(1)Set the specified hash field to the specified value, if field does not exist yet.+
If key does not exist, a new key holding a hash is created.+
If the field already exists, this operation has no effect and returns 0.Otherwise, the field is set to value and the operation returns 1.+