Redis之set(键)学习

参考地址

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• sadd：添加一个元素到集合（集合中的元素无序的并且唯一）

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

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• srem: srem key value 删除key内的指定value

• smembers:smembers key        查询key所有值

127.0.0.1:6379> SREM set1 1
(integer) 1
127.0.0.1:6379> SMEMBERS set1
1) "2"
2) "3"
3) "4"

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• spop:spop key [count]  随机删除key内的一个或多个value

127.0.0.1:6379> SPOP set1 1
1) "3"
127.0.0.1:6379> SMEMBERS set1
1) "2"
2) "4"

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• smove:smove key1 key2 value      将key1内的value删除添加到key2内

127.0.0.1:6379> SMOVE set1 set2 5
(integer) 1
127.0.0.1:6379> SMEMBERS set1
1) "4"
127.0.0.1:6379> SMEMBERS set2
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"

如果key2存在value，则不添加

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• sdiff:sdiff key1 key2        返回key1和key2的差集内key1的元素

127.0.0.1:6379> SDIFF set2 set1
1) "1"
2) "2"
3) "3"
4) "5"

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• sdiffstore:sdiffstore key1 key2 key3      将返回的差集存在key1内

127.0.0.1:6379> SMEMBERS set1 
1) "4"
127.0.0.1:6379> SMEMBERS set2
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
127.0.0.1:6379> SMEMBERS set3
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
6) "6"
127.0.0.1:6379> SDIFFSTORE set1 set2 set3
(integer) 0
127.0.0.1:6379> SDIFFSTORE set1 set3 set2
(integer) 1
127.0.0.1:6379> SMEMBERS set1
1) "6"

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• sinter:sinter key1 key2          返回key1和key2的交集

127.0.0.1:6379> SMEMBERS set2
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
127.0.0.1:6379> 
127.0.0.1:6379> SMEMBERS set3
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
6) "6"
127.0.0.1:6379> SINTER set2 set3
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"

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  sunion:sunion key1 key2         取key1和key2的并集

127.0.0.1:6379> SMEMBERS set2
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
127.0.0.1:6379> SMEMBERS set3
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
6) "6"
127.0.0.1:6379> SUNION set2 set3
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
6) "6"

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  sunionstore:sunionstore key1 key2 key3      将并集存在key1内

127.0.0.1:6379> SMEMBERS set1
1) "6"
127.0.0.1:6379> SMEMBERS set2
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
127.0.0.1:6379> SMEMBERS set3
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
6) "6"
127.0.0.1:6379> SUNIONSTORE set1 set2 set3
(integer) 6
127.0.0.1:6379> SMEMBERS set1
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
6) "6"

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  scard:scard key               返回key内的值个数

127.0.0.1:6379> SMEMBERS set1
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
6) "6"
127.0.0.1:6379> SCARD set1
(integer) 6

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• srandmember:srandmember  key [count]       随机返回key的一个或多个value

127.0.0.1:6379> SRANDMEMBER set1 2
1) "6"
2) "2"