redis-有序集合

zadd key score1 value1 score2 value2 ..
添加元素

redis 127.0.0.1:6379> zadd stu 18 lily19 hmm 20 lilei 21 lilei

(integer) 3

 

zrem key value1 value2 ..
作用: 删除集合中的元素

 

zremrangebyscore key min max
作用: 按照socre来删除元素,删除score在[min,max]之间的

redis 127.0.0.1:6379> zremrangebyscorestu 4 10

(integer) 2

redis 127.0.0.1:6379> zrange stu 0 -1

1) "f"

 

zremrangebyrank key start end
作用: 按排名删除元素,删除名次在[start,end]之间的

redis 127.0.0.1:6379> zremrangebyrankstu 0 1

(integer) 2

redis 127.0.0.1:6379> zrange stu 0 -1

1) "c"

2) "e"

3) "f"

4) "g"

 

zrank key member
查询member的排名(升续 0名开始)

 

zrevrank key memeber
查询 member的排名(降续 0名开始)

 

ZRANGE key start stop [WITHSCORES]
把集合排序后,返回名次[start,stop]的元素

默认是升续排列

Withscores 是把score也打印出来

 

zrevrange key start stop
作用:把集合降序排列,取名字[start,stop]之间的元素

 

zrangebyscore  key minmax [withscores] limit offset N
作用: 集合(升续)排序后,取score在[min,max]内的元素,

并跳过 offset个, 取出N个

redis 127.0.0.1:6379> zadd stu 1 a 3 b 4c 9 e 12 f 15 g

(integer) 6

redis 127.0.0.1:6379> zrangebyscore stu3 12 limit 1 2 withscores

1) "c"

2) "4"

3) "e"

4) "9"

 

 

zcard key
返回元素个数

 

zcount key min max
返回[min,max] 区间内元素的数量

 

 

zinterstore destination numkeys key1 [key2 ...]

[WEIGHTS weight [weight ...]]

[AGGREGATE SUM|MIN|MAX]
求key1,key2的交集,key1,key2的权重分别是 weight1,weight2

聚合方法用: sum|min|max

聚合的结果,保存在dest集合内

 

注意: weights,aggregate如何理解?
答: 如果有交集, 交集元素又有socre,score怎么处理?

 Aggregate sum->score相加  , min 求最小score, max 最大score

 

另: 可以通过weigth设置不同key的权重, 交集时,socre * weights

 

详见下例

redis 127.0.0.1:6379> zadd z1 2 a 3 b 4c

(integer) 3

redis 127.0.0.1:6379> zadd z2 2.5 a 1 b8 d

(integer) 3

redis 127.0.0.1:6379> zinterstore tmp 2z1 z2

(integer) 2

redis 127.0.0.1:6379> zrange tmp 0 -1

1) "b"

2) "a"

redis 127.0.0.1:6379> zrange tmp 0 -1withscores

1) "b"

2) "4"

3) "a"

4) "4.5"

redis 127.0.0.1:6379> zinterstore tmp 2z1 z2 aggregate sum

(integer) 2

redis 127.0.0.1:6379> zrange tmp 0 -1withscores

1) "b"

2) "4"

3) "a"

4) "4.5"

redis 127.0.0.1:6379> zinterstore tmp 2z1 z2 aggregate min

(integer) 2

redis 127.0.0.1:6379> zrange tmp 0 -1withscores

1) "b"

2) "1"

3) "a"

4) "2"

redis 127.0.0.1:6379> zinterstore tmp 2z1 z2 weights 1 2

(integer) 2

redis 127.0.0.1:6379> zrange tmp 0 -1withscores

1) "b"

2) "5"

3) "a"

4) "7"