Redis 数据结构之有序集合（sort set）

有序集合sortset的元素包括score(分数，int/float) ,value（成员，string/int/float） ,rank等三个属性，
(1)实际上是score 和 value的映射；
(2)value 在有序集合中必须是唯一的，score可以重复；
(3)rank 从0 开始，score越大，rank值越大，相同分数，value中的字母在字典中越后，rank值越大；
127.0.0.1:6379>
127.0.0.1:6379> get new:counter
"1"
127.0.0.1:6379> incr new:counter
(integer) 2
127.0.0.1:6379> zadd sort-set:2 99 zhangsan
(integer) 1
127.0.0.1:6379> zadd sort-set:2 92.5 lisi
(integer) 1
127.0.0.1:6379> zadd sort-set:2 97.50 wangwu
(integer) 1

zrange 按照字典字母表顺序取出所有元素的value
127.0.0.1:6379> zrange sort-set:2 0 -1
1) "lisi"
2) "wangwu"
3) "zhangsan"
withscores 关键字返回元素的score值
127.0.0.1:6379> zrange sort-set:2 0 -1 withscores
1) "lisi"
2) "92.5"
3) "wangwu"
4) "97.5"
5) "zhangsan"
6) "99"
zrevrange 按照字典字母表倒序顺序取出所有元素的value
127.0.0.1:6379> zrevrange sort-set:2 0 -1 withscores
1) "zhangsan"
2) "99"
3) "wangwu"
4) "97.5"
5) "lisi"
6) "92.5"
zcard 返回有序集合size
127.0.0.1:6379> zcard sort-set:2
(integer) 3
zrank 返回集合中当前元素的rank属性（rank值）
127.0.0.1:6379> zrank sort-set:2 wangwu
(integer) 1
zrangebylex以字典顺序获取集合中元素的value，类似的还有 zrevrangebylex, zlexcount命令

127.0.0.1:6379> zadd sort-set:2 92.5 zhuliu 90 qianqi
(integer) 2
127.0.0.1:6379> zrange sort-set:2 0 -1
1) "qianqi"
2) "lisi"
3) "zhuliu"
4) "wangwu"
5) "zhangsan"
127.0.0.1:6379> zrange sort-set:2 0 -1 withscores
 1) "qianqi"
 2) "90"
 3) "lisi"
 4) "92.5"
 5) "zhuliu"
 6) "92.5"
 7) "wangwu"
 8) "97.5"
 9) "zhangsan"
10) "99"

当元素的value值重复时，zadd 只修改该元素的value值，不添加元素
127.0.0.1:6379> zadd sort-set:2 95 qianqi
(integer) 0
127.0.0.1:6379> zrange sort-set:2 0 -1 withscores
 1) "lisi"
 2) "92.5"
 3) "zhuliu"
 4) "92.5"
 5) "qianqi"
 6) "95"
 7) "wangwu"
 8) "97.5"
 9) "zhangsan"
10) "99"
127.0.0.1:6379> zrevrange sort-set:2 0 -1 withscores
 1) "zhangsan"
 2) "99"
 3) "wangwu"
 4) "97.5"
 5) "qianqi"
 6) "95"
 7) "zhuliu"
 8) "92.5"
 9) "lisi"
10) "92.5"
-表示负无穷，+表示正无穷
127.0.0.1:6379> zrangebylex sort-set:2 - +
1) "lisi"
2) "zhuliu"
3) "qianqi"
4) "wangwu"
5) "zhangsan"


127.0.0.1:6379> zadd sort-set:2 92.5 qianqi
(integer) 0
127.0.0.1:6379> zrangebylex sort-set:2 - +
1) "lisi"
2) "qianqi"
3) "zhuliu"
4) "wangwu"
5) "zhangsan"

字符前的（表示排除该字符串的值，[表示包含该字符串的值
127.0.0.1:6379> zrangebylex sort-set:2 (l [q
1) "lisi"
127.0.0.1:6379> zrangebylex sort-set:2 (l (q
1) "lisi"
127.0.0.1:6379> zrangebylex sort-set:2 (l [z
1) "lisi"
2) "qianqi"
127.0.0.1:6379> zrangebylex sort-set:2 (l (z
1) "lisi"
2) "qianqi"
127.0.0.1:6379> zrangebylex sort-set:2 (lisi (z
1) "qianqi"
127.0.0.1:6379> zrangebylex sort-set:2 (lisi [zhangsan
1) "qianqi"
127.0.0.1:6379> zrangebylex sort-set:2 (lisi [zhuliu
1) "qianqi"
2) "zhuliu"
3) "wangwu"
4) "zhangsan"