redis_zset

Zset

• 集合中不能有重复元素

• 集合中的元素可以排序，每个元素设置一个分数(score)作为排序的依据. score可以重复。

• 1：集合内

  • 添加成员 zadd key score member [score member ...]

    127.0.0.1:6379> zadd user:ranking 250 tom   #向有序集合user:ranking 添加用户tom和分数250
    (integer) 1
    127.0.0.1:6379> zadd user:ranking 1 kris 91 mike 200 frank  220 tim  250 martin
    (integer) 5
    
    new特新:
    nx:member不存在，则设置成功
    xx:member必须存在，用于更新
    ch:返回此次操作后，有序集合元素和分数发生变化的个数
    incr:对score做增加
    
    #O(log(n))
    

  • 计算成员个数 zcard key

    127.0.0.1:6379> zcard user:ranking
    (integer) 6
    

  • 计算某个成员的分数 zscore key member

    127.0.0.1:6379> zscore user:ranking mike
    "91"
    

  • 计算成员的排名

    • zrank key member --从低到高
    • zrevrank key member --从高到低

    127.0.0.1:6379> zrank user:ranking tom
    (integer) 5
    127.0.0.1:6379> zrevrank user:ranking tom   #排名从0开始计数
    (integer) 0
    

  • 删除成员 zrem key member

    127.0.0.1:6379> zrem user:ranking mike
    (integer) 1
    

  • 增加成员的 分数 zincrby key increment member

    127.0.0.1:6379> zincrby user:ranking 9 tom   #给tom加9分
    "259"
    

  • 返回指定排名范围的成员

    • zrange key start end [withscores]
    • zrevrange key start end [withscores]

    127.0.0.1:6379> zrange user:ranking 0 2 withscores
    1) "kris"
    2) "1"
    3) "frank"
    4) "200"
    5) "tim"
    6) "220"
    
    127.0.0.1:6379> zrevrange user:ranking 0 2  withscores
    1) "tom"
    2) "259"
    3) "martin"
    4) "250"
    5) "tim"
    6) "220"
    

  • 返回指定分数范围的成员

    • zrangebyscore key min max [withscores] [limit offset count]

    • zrevrangebyscore key min max [withscores] [limit offset count]

      127.0.0.1:6379> zrangebyscore user:ranking 200 221 withscores
      1) "frank"
      2) "200"
      3) "tim"
      4) "220"
      
      #min,max 支持(开区间),[闭区间]
      #-inf 无限小
      #+inf 无限大
      127.0.0.1:6379> zrangebyscore user:ranking (200 +inf  withscores
      1) "tim"
      2) "220"
      3) "martin"
      4) "250"
      5) "tom"
      6) "259"
      

    • 返回指定分数范围成员的个数 zcount key min max

      127.0.0.1:6379> zcount user:ranking 200 221
      (integer) 2
      

    • 删除指定排名内的升序元素 zremrangebyrank key start end

      127.0.0.1:6379> zremrangebyrank  user:ranking  0 2
      (integer) 3
      
      
      127.0.0.1:6379> zrangebyscore user:ranking -inf  +inf  withscores  #查看所有成员
      1) "martin"
      2) "250"
      3) "tom"
      4) "259"
      

    • 删除指定分数范围内的成员 zremrangebyscore key min max

      127.0.0.1:6379> zremrangebyscore  user:ranking  (250  +inf  
      (integer) 1
      

  • 集合间的操作

    • 两个集合

    • 127.0.0.1:6379> zadd user:ranking:1  1 kris  91 mike  220  frank 220  tim 250 martin  251  tom 
      (integer) 6
      
      127.0.0.1:6379> zadd user:ranking:2  8 james  77 mike  625 martin  888 tom
      (integer) 4
      
      127.0.0.1:6379> keys *
      1) "user:ranking:1"
      2) "user:ranking:2"
      

      • 交集

      • zinterscore destination numkeys key1 [key2 ....] [weights weight1 [weight2 ...] ] [aggregate sum| min | max]

      • numkeys 代表key1，key2的总数

      • weights 权重, weight1 对应key1的权重，weight2对应key2的权重，默认值是1.

      • aggregate：聚合，计算交集后做汇总，默认是sum

        127.0.0.1:6379> zinterstore user:ranking:1_2_inter  2  user:ranking:1  user:ranking:2  weights  1  1  
        (integer) 3
        127.0.0.1:6379> keys *
        1) "user:ranking:2"
        2) "user:ranking:1_2_inter"
        3) "user:ranking:1"
        
        #查看一下交集的成员
        127.0.0.1:6379> zrange  user:ranking:1_2_inter 0 -1 withscores
        1) "mike"
        2) "168"
        3) "martin"
        4) "875"
        5) "tom"
        6) "1139"
        
        
        

      • 并集

      • zunionscore destination numkeys key1 [key2 ....] [weights weight1 [weight2 ...] ] [aggregate sum| min | max]

    • 内部编码

    • ziplist(压缩列表）：zset类型元素个数<hash-max-ziplist-entries(default128) 或者 所有的值<hash-max-ziplist-value(64字节) 同时满足以上2个条件，则使用更加紧凑的ziplist实现多个元素的连续存储。

    • skiplist(跳跃表):