Redis有序集合类型

命令

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

获得元素的分数

ZSCORE key member

> ZSCORE scoreboard Tom

"89"

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"

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"

增加某个元素的分数

ZINCRBY key increment memeber

> ZINCRBY scoreboard 4 Peter

"80"

> ZINCRBY scoreboard -4 Peter

"76"

获得集合中元素的数量

ZCARD key

> ZCARD scoreboard

(integer) 3

获得指定分数范围内的元素个数

ZCOUNT key min max

> ZCOUNT scoreboard 90 100

(integer) 1

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

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"
```

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"

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

计算有序集合的交集

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

巴特西

Redis有序集合类型

命令

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