Redis的Set数据类型及常用命令

set中的值无序不能重复！！！

SADD 添加元素

SMEMBERS 查询元素

127.0.0.1:6379> SADD set one two three
(integer) 3
127.0.0.1:6379> SMEMBERS set
1) "three"
2) "two"
3) "one"

SISMEMBER 查看是否存在这个元素

127.0.0.1:6379> SMEMBERS set
1) "three"
2) "two"
3) "one"
127.0.0.1:6379> SISMEMBER set one
(integer) 1
127.0.0.1:6379> SISMEMBER set four
(integer) 0

SCARD 获取元素的个数

127.0.0.1:6379> SCARD set 
(integer) 3

SMEMBERS移除指定元素，可以移除多个，用空格分隔

127.0.0.1:6379> SREM set two
(integer) 1
127.0.0.1:6379> SMEMBERS set
1) "three"
2) "one"

SRANDMEMBER随机抽选出指定个数的个数

127.0.0.1:6379> SMEMBERS set
1) "three"
2) "two"
3) "one"
4) "four"
5) "five"
127.0.0.1:6379> SRANDMEMBER set 2
1) "one"
2) "four"

SREM删除指定的一个或多个元素

127.0.0.1:6379> SREM set1 ok
(integer) 1
127.0.0.1:6379> SMEMBERS set1
1) "two"

127.0.0.1:6379> FLUSHALL
OK
127.0.0.1:6379> sadd set one two three four
(integer) 4
127.0.0.1:6379> SREM set two three
(integer) 2
127.0.0.1:6379> SMEMBERS set
1) "one"
2) "four"

随机删除一个或指定个数的元素

127.0.0.1:6379> SMEMBERS set
1) "three"
2) "two"
3) "one"
4) "four"
5) "five"
127.0.0.1:6379> SPOP set 
"three"
127.0.0.1:6379> SPOP set 2
1) "one"
2) "four"

SMOVE移动某个元素到另一个set中，语法：SMOVE 源set 目的set 元素

127.0.0.1:6379> SADD set one two four
(integer) 3
127.0.0.1:6379> SADD set1 ok
(integer) 1
127.0.0.1:6379> SMOVE set set1 two
(integer) 1
127.0.0.1:6379> SMEMBERS set
1) "one"
2) "four"
127.0.0.1:6379> SMEMBERS set1
1) "two"
2) "ok"

SDIFF一个set集合和另一个set集合的差集

127.0.0.1:6379> SADD s1 a1 a2 a3(integer) 3127.0.0.1:6379> SADD s2 a2 a3 a5 a6(integer) 4127.0.0.1:6379> SDIFF s1 s21) "a1"127.0.0.1:6379> SDIFF s2 s11) "a5"2) "a6"

SINTER一个set集合和另一个set集合的交集

127.0.0.1:6379> SINTER s1 s21) "a3"2) "a2"

SUNION一个set集合和另一个set集合的并集

127.0.0.1:6379> SUNION s1 s21) "a5"2) "a3"3) "a6"4) "a2"5) "a1"

学习参考狂神说java