redis操作set类型的基本命令_redis set结构 读取

    set数据类型可以理解为java中的hashtable，它是无序的，set中成员也是唯一的，我们来学习set的常用命令。

 

• sadd key 追加的值(向set中值)

127.0.0.1:6379> sadd s1 a b c d e
(integer) 5

 

• scard key (获取set中的集合数)

127.0.0.1:6379> scard s1
(integer) 5

 

• smembers key(取出set中所有的值)

127.0.0.1:6379> smembers s1
1) "d"
2) "b"
3) "a"
4) "c"
5) "e"

    这里前面提到set数据类型是无序得，所以取出来的时候，没有按照添加的顺序打印出来。

 

• sismember key 值(查看指定的值是不是set中的成员，是的话，返回1，不是的话返回0，用于校验值存不存在，这里和c语言中的，判断相似，0是false，0以外都是true)

127.0.0.1:6379> smembers s1
1) "d"
2) "b"
3) "a"
4) "c"
5) "e"
127.0.0.1:6379> sismember s1 a
(integer) 1
127.0.0.1:6379> sismember s1 aaa
(integer) 0

 

• srandmember key count(返回集合中一个或多个随机数，参数中的count是来指定一个，或多个)

127.0.0.1:6379> srandmember s1 1  #返回一个随机数
1) "a"
127.0.0.1:6379> srandmember s1 2 #返回两个随机数
1) "b"
2) "e"

 

• serm key 值(删除set中指定的值，可以删除多个，返回删除的个数)

127.0.0.1:6379> smembers s1
1) "d"
2) "a"
3) "b"
4) "e"
5) "c"
127.0.0.1:6379> srem s1 a b
(integer) 2
127.0.0.1:6379> smembers s1
1) "d"
2) "e"
3) "c"

 

• spop key count(随机删除并弹出set中的指定个数的元素)

127.0.0.1:6379> smembers s1
1) "d"
2) "b"
3) "a"
4) "e"
5) "c"
127.0.0.1:6379>
127.0.0.1:6379> spop s1 2
1) "e"
2) "b"
127.0.0.1:6379> smembers s1
1) "d"
2) "a"
3) "c"

    

• smove key1 key2 指定的值(从key1中移动指定的值，到key2中)

127.0.0.1:6379> smembers s1
1) "d"
2) "e"
3) "b"
4) "a"
5) "c"
127.0.0.1:6379> smembers s2
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
127.0.0.1:6379> smove s1 s2 e
(integer) 1
127.0.0.1:6379> smembers s1
1) "d"
2) "b"
3) "a"
4) "c"
127.0.0.1:6379> smembers s2
1) "4"
2) "1"
3) "e"
4) "5"
5) "3"
6) "2"

 

• sdiff key1 key2(取出key1中和key2不一样的元素，也可叫做差集)

127.0.0.1:6379> smembers s1
1) "b"
2) "a"
3) "c"
4) "1"
5) "3"
6) "2"
127.0.0.1:6379> smembers s2
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
127.0.0.1:6379> sdiff s1 s2
1) "a"
2) "b"
3) "c"

 

• sdiffstore key3 key1 key2 (取出key1中和key2不一样的元素，并存储到key3中)

127.0.0.1:6379> smembers s1
1) "1"
2) "b"
3) "a"
4) "c"
5) "2"
127.0.0.1:6379> smembers s2
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
127.0.0.1:6379> sdiffstore s3 s1 s2
(integer) 3
127.0.0.1:6379> smembers s1
1) "1"
2) "b"
3) "a"
4) "c"
5) "2"
127.0.0.1:6379> smembers s2
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
127.0.0.1:6379> smembers s3
1) "a"
2) "b"
3) "c"

 

• sinter key1 key2(取出key1和key2中一样的元素，也可称为交集)

127.0.0.1:6379> smembers s1
1) "1"
2) "b"
3) "a"
4) "c"
5) "2"
127.0.0.1:6379> smembers s2
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
127.0.0.1:6379> sinter s1 s2
1) "1"
2) "2"

 

• sinterstone key3 key1 key2(取出key1和key2中一样的元素，存储到key3中)

127.0.0.1:6379> smembers s1
1) "1"
2) "b"
3) "a"
4) "c"
5) "2"
127.0.0.1:6379> smembers s2
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
127.0.0.1:6379> sinterstore s3 s1 s2
(integer) 2
127.0.0.1:6379> smembers s3
1) "1"
2) "2"

 

• sunion key1 key2(取出key1和key2的所有值，自动剔除重复，也可称为并集)

127.0.0.1:6379> smembers s1
1) "1"
2) "b"
3) "a"
4) "c"
5) "2"
127.0.0.1:6379> smembers s2
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
127.0.0.1:6379> sunion s1 s2
1) "4"
2) "1"
3) "5"
4) "b"
5) "a"
6) "3"
7) "2"
8) "c"

 

• sunionstore key3 key1 key2(将key1和key2中的值，存储到key3中，并且去掉重复)

127.0.0.1:6379>  smembers s1
1) "1"
2) "b"
3) "a"
4) "c"
5) "2"
127.0.0.1:6379>  smembers s2
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"
127.0.0.1:6379> sunionstore s3 s1 s2
(integer) 8
127.0.0.1:6379> smembers s3
1) "4"
2) "1"
3) "5"
4) "b"
5) "a"
6) "3"
7) "2"
8) "c"