redis命令(5)--有序集合类型(zset)

有序集合类型是使用散列表和跳跃表(Skip list)实现的,所以即使读取位于中间部分的数据速度也很快(时间复杂度是O(log(N)))。

 

有序集合类型中元素唯一性,有序性。

有序是按照元素的分值排序,分值是添加元素时指定的,可以改变元素的分值从而改变元素的顺序。

 

以下命令中的key 为有序集合的key(键名)

 

 

1.添加元素

ZADD key score value[score value…]

向有序集合中添加一个或多个元素,元素值为value ,对应的分值为score ,如果集合中不存在value,则添加,否则更改该元素的分值==score

score 可以为整型或浮点型 ,特殊值:+inf 正无穷 -inf负元穷

 

localhost:6379> zadd ranking 90 iphone 80 sony 82 huawei 78 mi
(integer) 4
localhost:6379> zadd ranking 83 mi
(integer) 0

 2.获取元素的分值

zscore key value

 

localhost:6379> del ranking
(integer) 1
localhost:6379> zadd ranking 90 iphone 80 sony 82 huawei 78 mi
(integer) 4
localhost:6379> zscore ranking iphone
"90"
 

3.按排名范围查询元素,返回值按由小到大的顺序排列

ZRANGE key  startIndex , endIndex [WITHSCORES]

添加到有序集合中的元素会按分值由小到大排名。

排名写法:

1.分值最小的排名为0 ,分值最大的排名等于元素个数-1,

2.分值最大的排名为-1,分值最小的排名等于负的元素个数

如:有10个元素的有序集合:

1.元素值最小的排名为0 ,元素值最大的排名为9,

元素值最小的排名为-10 ,元素值最大的排名为-1,

 

localhost:6379> del ranking
(integer) 1
localhost:6379> zadd ranking 90 iphone 80 sony 82 huawei 78 mi
(integer) 4
localhost:6379> zrange ranking 0 3
1) "mi"
2) "sony"
3) "huawei"
4) "iphone"
localhost:6379> zrange ranking 0 -1
1) "mi"
2) "sony"
3) "huawei"
4) "iphone"
localhost:6379> zrange ranking -2 -1
1) "huawei"
2) "iphone"
localhost:6379> zrange ranking -1 -2
(empty list or set)
 如果需要返回分值,则zrange 命令最后面增加:WITHSCORES
localhost:6379> zrange ranking 0 -1 withscores
1) "mi"
2) "78"
3) "sony"
4) "80"
5) "huawei"
6) "82"
7) "iphone"
8) "90"
 4.按排名范围查询元素,返回值按由大到小的顺序排列

ZREVRANGE key  startIndex , endIndex  [WITHSCORES]

 zrevrange 与zrange 命令相同,只是返回值按由大到小顺序排列

localhost:6379> del ranking
(integer) 1
localhost:6379> zadd ranking 90 iphone 80 sony 82 huawei 78 mi
(integer) 4
localhost:6379> zrevrange ranking 0 -1
1) "iphone"
2) "huawei"
3) "sony"
4) "mi"
localhost:6379> zrevrange ranking 0 3
1) "iphone"
2) "huawei"
3) "sony"
4) "mi"
localhost:6379> zrevrange ranking -4 -1
1) "iphone"
2) "huawei"
3) "sony"
4) "mi"
 5.按分值范围查询元素,返回值按元素分值小到大排序

ZRANGEBYSCORE key minScore maxScore [WITHSCROES] [LIMIT  offset count]

查询分值>=minScore  && 分值<=maxScore 的元素。

(分值可以使用-inf负无穷大+inf正无穷大)

("("+分值 代表不包含该分值)

WITHSCROES :返回值中带有元素的分值

[LIMIT  offset count]:在查询结果的元素中,以排序在offset 位置开始取count个元素,offset由0开始

 

localhost:6379> del ranking
(integer) 1
localhost:6379> zadd ranking 90 iphone 80 sony 82 huawei 78 mi
(integer) 4
localhost:6379> zrangebyscore ranking 80 90
1) "sony"
2) "huawei"
3) "iphone"
localhost:6379> zrangebyscore ranking 80 90  withscores
1) "sony"
2) "80"
3) "huawei"
4) "82"
5) "iphone"
6) "90"
localhost:6379> zrangebyscore ranking 80 90 withscores
1) "sony"
2) "80"
3) "huawei"
4) "82"
5) "iphone"
6) "90"
localhost:6379> zrangebyscore ranking 80 90 withscores limit 0 2
1) "sony"
2) "80"
3) "huawei"
4) "82"
 

6.增加某个元素的分值

Z INCRBY key increment value

localhost:6379> del ranking
(integer) 1
localhost:6379> zadd ranking 90 iphone 80 sony 82 huawei 78 mi
(integer) 4
localhost:6379> zrange ranking 0 -1 withscores
1) "mi"
2) "78"
3) "sony"
4) "80"
5) "huawei"
6) "82"
7) "iphone"
8) "90"
localhost:6379> zincrby ranking 8 mi
"86"
localhost:6379> zrange ranking 0 -1 withscores
1) "sony"
2) "80"
3) "huawei"
4) "82"
5) "mi"
6) "86"
7) "iphone"
8) "90"
 

7.获取有序集合中的元素个数

ZCARD key

localhost:6379> del ranking
(integer) 1
localhost:6379> zadd ranking 90 iphone 80 sony 82 huawei 78 mi
(integer) 4

localhost:6379> zcard ranking
(integer) 4
 8.获取指定分值范围的元素的个数

ZCOUNT key minScore maxScore

localhost:6379> del ranking
(integer) 1
localhost:6379> zadd ranking 90 iphone 80 sony 82 huawei 78 mi
(integer) 4

localhost:6379> zcount ranking 80 90
(integer) 2
 9.删除一个或多个元素,返回删 除元素的个数

ZREM key value1 value2 value...

localhost:6379> del ranking
(integer) 1
localhost:6379> zadd ranking 90 iphone 80 sony 82 huawei 78 mi
(integer) 4


localhost:6379> zrem ranking sony mi
(integer) 2
localhost:6379> zrange ranking 0 -1
1) "huawei"
2) "iphone"

 10.按排名范围删除元素

ZREMRANGEBYRANK key startIndex endIndex

localhost:6379> del ranking
(integer) 1
localhost:6379>  zadd ranking 90 iphone 80 sony 82 huawei 78 mi
(integer) 4
localhost:6379> zremrangebyrank ranking 0 2
(integer) 3
localhost:6379> zrange ranking 0 -1
1) "iphone"

 11.按分值范围删除元素

ZREMRANGEBYSCORE key minScore maxScore

localhost:6379>  del ranking
(integer) 1
localhost:6379>  zadd ranking 90 iphone 80 sony 82 huawei 78 mi
(integer) 4
localhost:6379> zremrangebyscore ranking 70 80
(integer) 2
localhost:6379> zrange ranking 0 -1
1) "huawei"

 12.获取元素的排名

ZRANK key value //返回元素值==value的元素的排名 (由小到到的排名顺序,最小值排名为0)

ZREVRANK key value  //返回元素值==value的元素的排名 (由大到小的排名顺序,最大值排名为0)

localhost:6379> del ranking
(integer) 1
localhost:6379>  zadd ranking 90 iphone 80 sony 82 huawei 78 mi
(integer) 4
localhost:6379> zrank ranking sony
(integer) 1
localhost:6379> zrevrank ranking sony
(integer) 2
localhost:6379> zrank ranking iphone
(integer) 3
localhost:6379> zrevrank ranking iphone
(integer) 0

 13.有序集合的交运算

ZINTERSTORE destination numkeys key [key …] [WEIGHTS weight [weight …]]

[AGREGATE SUM|MIN|MAX]

N个有序集合中相同元素分值计算,并将结果保存在目标有序集合中。

destination :交运算的结果保存到有序集合destination 中

numkeys :指定参与计算的有序集合的个数

key [key …]:参与计算的有序集合

[WEIGHTS weight [weight …]]:可选参数,指定参与计算的每一个集合的权重,计算时,集合中元素的分值乘以权重,再与其它集合计算

[AGREGATE SUM|MIN|MAX]:可选参数,默认为 集合中相同元素进行sum计算,可以指定为min 取小值或max 取最大值计算

localhost:6379> del testOne
(integer) 1
localhost:6379> del testTwo
(integer) 1
localhost:6379> zadd testOne 90 tom 80 carry 70 lisa
(integer) 3
localhost:6379> zadd testTwo 85 tom 95 carry 83 lisa
(integer) 3
localhost:6379> zinterstore testSumResult 2 testOne testTwo
(integer) 3
localhost:6379> zrange testSumResult 0 -1 withscores
1) "lisa"
2) "153"
3) "carry"
4) "175"
5) "tom"
6) "175"
localhost:6379> zinterstore testMinResult 2 testOne testTwo aggregate min
(integer) 3
localhost:6379> zrange testMinResult 0 -1 withscores
1) "lisa"
2) "70"
3) "carry"
4) "80"
5) "tom"
6) "85"
localhost:6379> zinterstore testMaxResult 2 testOne testTwo aggregate max
(integer) 3
localhost:6379> zrange testMaxResult 0 -1 withscores
1) "lisa"
2) "83"
3) "tom"
4) "90"
5) "carry"
6) "95"

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转载自java12345678.iteye.com/blog/2162568