Title: Redis sets
date: 2015-05-05 12:08:36 +0800
comments: true
category: Redis
tags: redis,linux
Redis Sets
## SADD -- add item into set
SADD myset "James"
# if success, return 1, else return 0
## SMEMBERS -- check members in set
SMEMBERS myset
## SREM -- delete members from set
SREM myset "Harry"
# if delete, return 1, else return 0, e.g. delete an un-exist member
## SPOP -- return and delete one key by random in set
SPOP myset
## SDIFF -- 返回所有给定的key与第一个key的差集
SDIFF set1 set2
# return member only in set1 and not in set2
## SDIFFSTORE -- 返回所有给定的key与第一个key的差集, 并将结果保存为另一个key
SDIFFSTORE result-set set1 set2
SMEMBERS result-set
## SINTER -- 返回所有给定的key的交集
SINTER set1 set2 [set3 ... setN]
## SINTERSTORE -- 交集结果保存为另一个set
SINTERSTORE result-set set1 set2 [set3 ... setN]
## SUNION -- 并集
SUNION set1 set2 [set3 ... setN]
## SUNIONSTORE -- 并集结果保存到另一个set
SUNIONSTORE result-set set1 set2 [set3 ... setN]
## SMOVE -- 从第一个key对应的set中移除member并添加到第二个对应set中
SMOVE first-set result-set member-name
127.0.0.1:6379[8]> SMEMBERS t_num2
1) "five"
2) "three"
3) "one"
127.0.0.1:6379[8]> SMOVE t_num2 t_num4 five
(integer) 1
127.0.0.1:6379[8]> SMEMBERS t_num2
1) "three"
2) "one"
127.0.0.1:6379[8]> SMEMBERS t_num4
1) "five"
## SCARD -- return number of the set
SCARD myset
## SINMEMBER -- test if member is in set
SINMEMBER myset member-name
## SRANDMEMBER -- 随机返回名称为key的set的一个元素，但是不删除元素
SRANDMEMBER myset
