一、Set类型使用

1.1、SADD key member [member.....]

添加元素

127.0.0.1:6379> sadd set1 1 1 2 2 3 3 4
(integer) 4

1.2、SMEMBERS key

遍历集合中的所有元素

127.0.0.1:6379> smembers set1
1) "1"
2) "2"
3) "3"
4) "4"

1.3、SISMEMBER key member

判断元素是否在集合中

127.0.0.1:6379> sismember set1 1
(integer) 1
127.0.0.1:6379> sismember set1 5
(integer) 0

1.4、SREM key member [member]

删除元素

127.0.0.1:6379> srem set1 1
(integer) 1
127.0.0.1:6379> srem set1 5
(integer) 0

1.5、scard

获取集合里面的元素个数

127.0.0.1:6379> smembers set1
1) "2"
2) "3"
3) "4"
127.0.0.1:6379> scard set1
(integer) 3

1.6、srandmember key [数字]

从集合中随机展现设置的数字个数元素，元素不删除

127.0.0.1:6379> srandmember set1 2
1) "1"
2) "5"
127.0.0.1:6379> smembers set1
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
6) "6"

1.7、spop key [数字]

从集合中随机弹出一个元素，出一个删一个

127.0.0.1:6379> spop set1 1
1) "2"
127.0.0.1:6379> spop set1 2
1) "1"
2) "4"
127.0.0.1:6379> smembers set1
1) "3"
2) "5"
3) "6"

1.8、smove key1 key2

将key1里已存在的某个值赋给key2

127.0.0.1:6379> smembers set1
1) "3"
2) "5"
3) "6"
127.0.0.1:6379> smembers set2
1) "7"
2) "8"
3) "9"
127.0.0.1:6379> smove set1 set2 3
(integer) 1
127.0.0.1:6379> smembers set2
1) "3"
2) "7"
3) "8"
4) "9"

1.9、集合运算

1.9.1、集合的差集运算A-B

sdiff key [key...]

127.0.0.1:6379> smembers set1
1) "c"
2) "1"
3) "b"
4) "a"
5) "2"
127.0.0.1:6379> smembers set2
1) "3"
2) "2"
3) "1"
4) "a"
5) "z"
127.0.0.1:6379> sdiff set1 set2
1) "c"
2) "b"

1.9.2、集合的并集运算A∪B

sunion key [key...]

127.0.0.1:6379> sunion set1 set2
1) "z"
2) "c"
3) "3"
4) "b"
5) "a"
6) "1"
7) "2"

1.9.2、集合的交集运算A∩B

sinter key [key...]

127.0.0.1:6379> sinter set1 set2
1) "1"
2) "a"
3) "2"

sintercard numkeys key [key...] [limit limit]

redis7新命令，它不返回结果集，而只返回结果的基数。返回由所有给定集合的交集产生的集合的基数。

127.0.0.1:6379> sintercard 2 set1 set2
(integer) 3
127.0.0.1:6379> sintercard 2 set1 set2 limit 1
(integer) 1
127.0.0.1:6379> sintercard 2 set1 set2 limit 2
(integer) 2
127.0.0.1:6379> sintercard 2 set1 set2 limit 4
(integer) 3