最近，总是以“太忙“为借口，很久没有blog了，凡事贵在恒，希望我能够坚持不懈，毕竟在blog的时候，也能提升自己。废话不说了，直奔主题”set“
redis set 是string类型对象的无序集合，set不管存储多少对象，对存储对象的add，remove和test操作的时间复杂度是O(1)。set最多能包含 232 - 1 个member。
1、增加
语法：sadd key member[member...]
解释：对特定key的set增加一个或多个值，返回是增加元素的个数。注意：对同一个member多次add，set中只会保留一份。
[plain] view plain copy [root@xsf001 ~]# redis-cli redis 127.0.0.1:6379> sadd stu zhangsan lisi wangwu #新增 (integer) 3 redis 127.0.0.1:6379> smembers stu #得到set的所有member 1) "wangwu" 2) "lisi" 3) "zhangsan" redis 127.0.0.1:6379> sadd stu zhangsan #增加存在的member (integer) 0 redis 127.0.0.1:6379> smembers stu 1) "wangwu" 2) "lisi" 3) "zhangsan" redis 127.0.0.1:6379> sadd tech wangwu liming joe (integer) 3 redis 127.0.0.1:6379> sadd tech jim (integer) 1 redis 127.0.0.1:6379> smembers tech 1) "jim" 2) "liming" 3) "wangwu" 4) "joe"
2、查询
a）smembers
语法：smembers key
解释：获取set中的所有member
[plain] view plain copy redis 127.0.0.1:6379> smembers stu 1) "wangwu" 2) "lisi" 3) "zhangsan" redis 127.0.0.1:6379> smembers tech 1) "jim" 2) "liming" 3) "wangwu" 4) "joe"
b）sismember
语法：sismember key member
解释：判断值是否是set的member。如果值是set的member返回1，否则，返回0
[plain] view plain copy redis 127.0.0.1:6379> sismember tech jim #jim 是set的member (integer) 1 redis 127.0.0.1:6379> sismember tech jim001 #jim001 不是set的member (integer) 0
c）scard
语法：scard key
解释：返回set的member个数，如果set不存在，返回0
[plain] view plain copy redis 127.0.0.1:6379> scard tech # tech 存在 (integer) 4 redis 127.0.0.1:6379> scard stud #stud 不存在 (integer) 0 redis 127.0.0.1:6379> scard stu (integer) 4
d）srandmember
语法：srandmember key
解释：从set中返回一个随机member
[plain] view plain copy redis 127.0.0.1:6379> srandmember stu "zhangsan" redis 127.0.0.1:6379> srandmember stu "zhangsan" redis 127.0.0.1:6379> srandmember stu "wangwu" redis 127.0.0.1:6379> srandmember stu "zhangsan01"
3、删除
a）spop
语法：spop key
解释：移除并返回一个随机member
[plain] view plain copy redis 127.0.0.1:6379> smembers stu #pop前 1) "zhangsan01" 2) "wangwu" 3) "lisi" 4) "zhangsan" redis 127.0.0.1:6379> spop stu #移除一个随机member "lisi" redis 127.0.0.1:6379> smembers stu #pop后 1) "zhangsan01"<span style="white-space:pre"> </span> 2) "wangwu" 3) "zhangsan"
b）srem
语法：srem key member [member ...]
解释：移除一个或多个member
[plain] view plain copy redis 127.0.0.1:6379> smembers tech 1) "jim" 2) "liming" 3) "wangwu" 4) "joe" redis 127.0.0.1:6379> srem tech jim #移除jim (integer) 1 redis 127.0.0.1:6379> smembers tech 1) "liming" 2) "wangwu" 3) "joe" redis 127.0.0.1:6379> srem tech liming joe #移除多个member (integer) 2 redis 127.0.0.1:6379> smembers tech 1) "wangwu"
c）smove
语法：smove source destination member
解释：将source中的member移动到destination
[plain] view plain copy redis 127.0.0.1:6379> smembers tech #smove前 1) "wangwu" redis 127.0.0.1:6379> smembers stu 1) "zhangsan01" 2) "wangwu" 3) "zhangsan" redis 127.0.0.1:6379> smove stu tech zhangsan #将zhangsan 从stu移动到tech (integer) 1 redis 127.0.0.1:6379> smembers stu #smove后 1) "zhangsan01" 2) "wangwu" redis 127.0.0.1:6379> smembers tech 1) "wangwu" 2) "zhangsan"
4、其他
a）并集
语法：sunion key[key...]
解释：多个set的并集
[plain] view plain copy redis 127.0.0.1:6379> smembers stu 1) "zhangsan01" 2) "wangwu" redis 127.0.0.1:6379> sunion stu 1) "zhangsan01" 2) "wangwu" redis 127.0.0.1:6379> smembers tech 1) "wangwu" 2) "zhangsan" redis 127.0.0.1:6379> sunion stu tech 1) "zhangsan01" 2) "wangwu" 3) "zhangsan"
b）把并集结果存储到set
语法：sunionstore destination key [key ...]
解释：求多个set并集，并把结果存储到destination
[plain] view plain copy redis 127.0.0.1:6379> sunionstore same stu tech #把stu tech并集结果存储在union (integer) 3 redis 127.0.0.1:6379> smembers union 1) "zhangsan01" 2) "wangwu" 3) "zhangsan"
c）交集
语法：sinter key[key...]
解释：多个set的交集
[plain] view plain copy redis 127.0.0.1:6379> smembers stu 1) "zhangsan01" 2) "wangwu" redis 127.0.0.1:6379> smembers tech 1) "wangwu" 2) "zhangsan" redis 127.0.0.1:6379> sinter stu tech 1) "wangwu"
d）把交集结果存储到指定set
语法：sinterstore destination key [key ...]
解释：把多个set的交集结果存储到destination
[plain] view plain copy redis 127.0.0.1:6379> sinterstore inter stu tech (integer) 1 redis 127.0.0.1:6379> smembers inter 1) "wangwu"
e) set中在其他set中不存在member
语法：sdiff key[key ...]
[plain] view plain copy redis 127.0.0.1:6379> redis 127.0.0.1:6379> smembers stu 1) "zhangsan01" 2) "wangwu" redis 127.0.0.1:6379> smembers tech 1) "wangwu" 2) "zhangsan" redis 127.0.0.1:6379> sdiff stu tech 1) "zhangsan01" redis 127.0.0.1:6379> sdiff tech stu 1) "zhangsan"
f）把set中在其他set中不存在的member存储到新的set
语法：sdiffstore key[key...]
[plain] view plain copy redis 127.0.0.1:6379> sdiffstore diff stu tech (integer) 1 redis 127.0.0.1:6379> smembers diff 1) "zhangsan01"
主要参考：
http://redis.io/commands#set
http://redis.io/topics/data-types
转载于:https://www.cnblogs.com/kingCpp/p/4648505.html
相关资源：数据结构—成绩单生成器