Redis sadd 命令

SADD key member [member …]

Add the specified members to the set stored at key.
Specified members that are already a member of this set are ignored.
If key does not exist, a new set is created before adding the specified

An error is returned when the value stored at key is not a set.


Integer reply: the number of elements that were added to the set, not including
all the elements already present into the set.


  • >= 2.4: Accepts multiple member arguments.
    Redis versions before 2.4 are only able to add a single member per call.


redis>  SADD myset “Hello”

(integer) 1

redis>  SADD myset “World”

(integer) 1

redis>  SADD myset “World”

(integer) 0

redis>  SMEMBERS myset

1) "World"
2) "Hello"