7.sinter setkey1 setkey2 setkey3...:返回setkey1和setkey2的交集
127.0.0.1:6379> smembers setkey1
1) "world"
2) "hello"
3) "2000"
127.0.0.1:6379> smembers setkey2
1) "3000"
2) "world"
3) "2000"
127.0.0.1:6379> smembers setkey3
1) "3000"
127.0.0.1:6379> sinter setkey1 setkey2
1) "world"
2) "2000"
127.0.0.1:6379> sinter setkey1 setkey2 setkey3
(empty list or set)
127.0.0.1:6379> sadd setkey3 2000
(integer) 1
127.0.0.1:6379> sinter setkey1 setkey2 setkey3
1) "2000"
8.sinterstore setkey3 setkey1 setkey2..:將取到的交集存儲到setkey3中。同sdiffstore
127.0.0.1:6379> sinterstore setkey5 setkey1 setkey2
(integer) 2
127.0.0.1:6379> smembers setkey5
1) "world"
2) "2000"
9.sunion setkey1 setkey2 setkey3....:取給定所有key的並集
127.0.0.1:6379> smembers setkey1
1) "world"
2) "hello"
3) "2000"
127.0.0.1:6379> smembers setkey2
1) "3000"
2) "world"
3) "2000"
127.0.0.1:6379> sunion setkey1 setkey2
1) "hello"
2) "2000"
3) "world"
4) "3000"
10.sunionstore setkey3 setkey1 setkey2...:將並集存到setkey3中
127.0.0.1:6379> sunionstore setkey6 setkey1 setkey2
(integer) 4
127.0.0.1:6379> smembers setkey6
1) "hello"
2) "2000"
3) "world"
4) "3000"
11.smove setkey1 setkey2 value:從setkey1中移除一個元素value到setkey2中。
127.0.0.1:6379> smembers setkey1
1) "world"
2) "hello"
3) "2000"
127.0.0.1:6379> smembers setkey2
1) "3000"
2) "world"
3) "2000"
127.0.0.1:6379> smove setkey1 setkey2 hello
(integer) 1
127.0.0.1:6379> smembers setkey2
1) "3000"
2) "world"
3) "hello"
4) "2000"
127.0.0.1:6379> smembers setkey1
1) "world"
2) "2000"
127.0.0.1:6379> smove setkey1 setkey2 world
(integer) 1
127.0.0.1:6379> smembers setkey1
1) "2000"
127.0.0.1:6379> smembers setkey2
1) "3000"
2) "world"
3) "hello"
4) "2000"
大家仔細看一下上面的例子。就會發現,如果被移動的value在setkey2中已經存在,那麼就相當於srem setkey1 value,僅僅是將value元素從setkey1中刪除。
12.scard setkey:查看setkey集合中元素的個數
127.0.0.1:6379> smembers setkey1
1) "3000"
2) "2000"
127.0.0.1:6379> scard setkey1
(integer) 2
如果集合中沒有元素那麼返回integer 0
13.sismember setkey value:測試value是否是名稱爲setkey的集合的元素。返回1代表是,返回0代表不是。
127.0.0.1:6379> smembers setkey1
1) "3000"
2) "2000"
127.0.0.1:6379> sismember setkey1 2000
(integer) 1
127.0.0.1:6379> sismember setkey1 4000
(integer) 0
14.srandmember setkey:隨機返回setkey的一個元素,但是不刪除元素。
127.0.0.1:6379> smembers setkey11) "1000"
2) "4000"
3) "3000"
4) "5000"
5) "2000"
127.0.0.1:6379> srandmember setkey1
"5000"
127.0.0.1:6379> srandmember setkey1
"2000"
127.0.0.1:6379> srandmember setkey1
"1000"
最後強調一點,set裏的數據是無序的。
通過學習並且測試上面的方法,一些細心的同學很容易能察覺到,用set來操作目前流行的sns或者微博的一些動態信息,實時消息或者實時推薦和分析都會非常方便。