zset類型以及其操作

sorted set類型

sorted sets類型以及其操作
zset是set的一格升級版本，它在set的基礎上增加了一格順序屬性，這一屬性在添加元素的同時可以指定，每次指定后，zset會自動重新按照新的值調整順序。可以理解為有兩列的mysql表，一列存儲value，一列存儲順序。操作中key理解成zset的名字。

zadd
向名稱為key的zset中添加元素member，score用於排序，如果該元素存在，則更新其順序

127.0.0.1:6379> zadd key [NX|XX] [CH] [INCR] score member [score member ...]
127.0.0.1:6379> zadd zset 0 one
(integer) 1
127.0.0.1:6379> zadd zset -1 two
(integer) 1

 

zrange
遍歷集合的元素
127.0.0.1:6379> zrange key start stop [WITHSCORES] //withscores代表的是否顯示順序號  start和stop代表所在的位置的索引。可以這樣理解：將集合元素依照順序值升序排序再輸出，start和stop限制遍歷的限制范圍

127.0.0.1:6379> zadd zset -1 hhh
(integer) 1
127.0.0.1:6379> zrange zset 0 0
1) "hhh"。
127.0.0.1:6379> zrange zset 0 -1 withscore
1) "two"
2) "-1"
3) "one"
4) "0"
zset元素也是不重復的，不要將它理解成為map了，score只是附加的，並不是array中的Index，而是代表該元素的順序號
同一個順序可以有多個元素：
127.0.0.1:6379>  zrange zset 0 -1 withscores
1) "one"
2) "0"
3) "two"
4) "0"

 

zrem
刪除集合中的member元素

127.0.0.1:6379> zrange zset 0 -1 withscores
1) "one"
2) "1"
3) "two"
4) "2"
5) "three"
6) "3"
127.0.0.1:6379> zrem zset one
(integer) 1
127.0.0.1:6379> zrange zset 0 -1
1) "two"
2) "three"

 

zincrby
如果在名稱為key的zset中已經存在元素member，則該元素的score增加incremenr否則向該集合中添加該元素，其score的值為increment

127.0.0.1:6379> zincrby key increment member
127.0.0.1:6379> zincrby zset 2 two
"4"
127.0.0.1:6379> zincrby zset 3 four
"3"
127.0.0.1:6379> zrange zset 0 -1 withscores
1) "four"
2) "3"
3) "three"
4) "3"
5) "two"
6) "4"
127.0.0.1:6379>
127.0.0.1:6379> zincrby zset -2 two
"2"

 

zrank
返回名稱為key的zset中member元素的排名（類似索引從0開始）（按score從小到大排序）即下標

127.0.0.1:6379> zrank key member
127.0.0.1:6379> zrange zset 0 -1 withscores
1) "two"
2) "2"
3) "four"
4) "3"
5) "three"
6) "3"
127.0.0.1:6379> zrank zset two
(integer) 0
127.0.0.1:6379> zrank zset four
(integer) 1
127.0.0.1:6379> zrank zset three
(integer) 2

注意得到的是排名而不是順序值score

zrevrank
rev：代表翻轉
返回名稱為key的zset中member元素的排名（按score從大到小排序），即下標

127.0.0.1:6379> zrange zset 0 -1 withscores
 1) "hhh"
 2) "-1"
 3) "hi"
 4) "2"
 5) "two"
 6) "2"
 7) "four"
 8) "3"
 9) "three"
10) "3"
127.0.0.1:6379> zrank zset hhh
(integer) 0
127.0.0.1:6379> zrevrank zset hhh
(integer) 4

 

zrevrange
按照順序值降序排序然后顯示指定下標內的值

127.0.0.1:6379> zrevrange key start stop [WITHSCORES]
127.0.0.1:6379> zrevrange zset 0 -1 withscores
 1) "three"
 2) "3"
 3) "four"
 4) "3"
 5) "two"
 6) "2"
 7) "hi"
 8) "2"
 9) "hhh"
10) "-1"
127.0.0.1:6379> zrange zset 0 -1 withscores
 1) "hhh"
 2) "-1"
 3) "hi"
 4) "2"
 5) "two"
 6) "2"
 7) "four"
 8) "3"
 9) "three"
10) "3"

 

zrangebyscore
就是利用score升序排序，而是返回集合中score給定區間內的元素。范圍內的元素一句score升序排序。start和stop代表的不再是index而是score

127.0.0.1:6379> zrangebyscore key min max [WITHSCORES] [LIMIT offset count]
127.0.0.1:6379> zrange zset 0 -1 withscores
 1) "hhh"
 2) "-1"
 3) "hi"
 4) "2"
 5) "two"
 6) "2"
 7) "four"
 8) "3"
 9) "three"
10) "3"
127.0.0.1:6379> zrangebyscore zset -1 2 withscores
1) "hhh"
2) "-1"
3) "hi"
4) "2"
5) "two"
6) "2"

 

zcount
返回集合中score指定區間中元素的數量

127.0.0.1:6379> zcount key min max
127.0.0.1:6379> zcount zset -1 2
(integer) 3

 

zcard
返回集合中的集合元素

127.0.0.1:6379> zcard zset
(integer) 5

 

zremrangebyrank
刪除集合中排名在指定區間內的元素，排名意思是index，排序值是score

127.0.0.1:6379> zremrangebyrank key start stop
127.0.0.1:6379> zrange zset 0 -1 withscores
 1) "hhh"
 2) "-1"
 3) "hi"
 4) "2"
 5) "two"
 6) "2"
 7) "four"
 8) "3"
 9) "three"
10) "3"
127.0.0.1:6379> zremrangebyrank zset 0 2
(integer) 3
127.0.0.1:6379> zrange zset 0 -1 withscores
1) "four"
2) "3"
3) "three"
4) "3"

 

remrangebyscore
刪除集合中排序值在指定區間的元素

127.0.0.1:6379> zrangebyscore key min max [WITHSCORES] [LIMIT offset count]
127.0.0.1:6379> zrange zset 0 -1 withscores
1) "four"
2) "3"
3) "three"
4) "3"
127.0.0.1:6379> zremrangebyscore zset 0 1
(integer) 0
127.0.0.1:6379> zremrangebyscore zset 3 3
(integer) 2
127.0.0.1:6379> zrange zset 0 -1 withscores
(empty list or set)