If the key already exists and is a string, this command appends the provided value at the end
of the string. If the key does not exist it is created and set as an empty string, so APPEND
will be very similar to SET in this special case.
<p>
Time complexity: O(1). The amortized time complexity is O(1) assuming the appended value is
small and the already present value is of any size, since the dynamic string library used by
Redis will double the free space available on every reallocation.
@param key
@param value
@return Integer reply, specifically the total length of the string after the append operation.
If the key already exists and is a string, this command appends the provided value at the end of the string. If the key does not exist it is created and set as an empty string, so APPEND will be very similar to SET in this special case. <p> Time complexity: O(1). The amortized time complexity is O(1) assuming the appended value is small and the already present value is of any size, since the dynamic string library used by Redis will double the free space available on every reallocation. @param key @param value @return Integer reply, specifically the total length of the string after the append operation.