Redis有序集合类型

命令

1. 增加元素

   ZADD score member [score member ...]
   
   > ZADD scoreboard 89 Tom 76 Peter 100 David
   (integer 3)
   

   • ZADD 命令用来向有序集合中加入一个元素和该元素的分数，如果该元素已经存在则会用新的分数替换原有的分数。
   • ZADD 命令的返回值是新加入到集合中的元素个数

2. 获得元素的分数

   ZSCORE key member
   
   > ZSCORE scoreboard Tom
   "89"
   

3. 获得排名在某个范围的元素列表

   ZRANGE key start stop [WITHSCORES]  // 元素分数从小到大
   
   ZREVRANGE key start stop [WITHSCORES]   //元素分数从大到小
   
   > ZRANGE scoreboard 0 2
   1) "Peter"
   2) "Tom"
   3) "David"
   > ZRANGE scoreboard 0 2 WITHSCORES
   1) "Peter"
   2) "76
   3) "Tom"
   4) "89"
   5) "David"
   6) "100"
   

4. 获得指定分数范围的元素

   ZRANGEBYSCORE key min max [WITHSCORES] [LIMIT offset count]
   
   ZREVRANGEBYSCORE key max min [WITHSCORES] [LIMIT offset count]
   
   > ZRANGEBYSCORE scoreboard 80 100 // 80 <= score <= 100
   1) "Tom"
   2) "David"
   > ZRANGEBYSCORE scoreboard 80 (100 // 80 <= score < 100
   1) "Tom"
   > ZRANGEBYSCORE scoreboard 80 +inf // 80 <= score
   1) "Tom"
   

5. 增加某个元素的分数

   ZINCRBY key increment memeber
   
   > ZINCRBY scoreboard 4 Peter
   "80"
   > ZINCRBY scoreboard -4 Peter
   "76"
   

6. 获得集合中元素的数量

   ZCARD key
   
   > ZCARD scoreboard
   (integer) 3
   

7. 获得指定分数范围内的元素个数

   ZCOUNT key min max
   
   > ZCOUNT scoreboard 90 100
   (integer) 1
   

8. 删除一个或多个元素

   ZREM key member [member ...]
   
   > ZREM scoreboard Jerry
   (integer) 1
   

   • 返回值是成功删除的元素数量

9. 按照排名范围删除元素

   按照元素分数从小到大的顺序删除（即索引0表示最小的值）删除处于指定排名范围内的所有元素，并返回删除的元素个数

   ZREMRANGEBYRANK key start stop 
   
   > ZADD testRem 1 a 2 b 3 c 4 d 5 e 6 f
   (integer) 6
   > ZREMRANGEBYRANK testRem 0 2
   (integer) 3
   > ZRANGE testRem 0 -1
   1) "d"
   2) "e"
   3) "f"
   

10. 按照分数范围删除元素

    ZREMRANGEBYSCORE key mix max
    
    > ZREMRANGEBYSCORE key (4 5
    (integer) 1
    > ZRANGE testRem 0 -1
    1) "d"
    3) "f"
    

11. 获得元素的排名

    ZRANK key member // 按元素分数从小到大
    ZREVRANK key member //按元素分数从大到小
    
    > ZRANK scoreboard Tom
    (integer) 0
    > ZREVRANK scoreboard Tom
    (integer) 1
    

12. 计算有序集合的交集

    ZINTERSTORE destination numkeys key [key ...] [WEIGHTS weight [weight ..]] [AGGREGATE SUM|MIN|MAX]