一、简要说明
Zset,即sorted set,有序集合。
Zset中的每个元素关联一个double类型的分数,之后可以根据这个分数为集合中的成员进行从小到大的排序。
| key | value | ||
| rank | member | score | |
| Trxcx | 3000 | ||
| Zy | 2000 | ||
| Rt | 1000 | ||
二、常用命令
| 格式 | 含义 | 例子 | 
| zadd key score member | 往key中添加member元素,并为score赋值 | zadd rank 3000 Trxcx 2000 Zy | 
| zincrby key increment member | 将key中的member元素,score增加increment | zincrby rank 2000 Zy | 
| zrange key start stop [withscores] | key中元素按照score升序排列,可选是否同时输出score | zrange rank 0 -1 | 
| zrevrange key start stop [withscores] | key中元素按照score降序排列,可选是否同时输出score | zrevrange rank 0 -1 | 
| zrank key member | 返回member在key中的正序排名(从低到高,从0开始) | zrank rank Trxcx | 
| zrevrank key member | 返回member在key中的倒序排名(从高到低,从0开始) | zrevrank rank Trxcx | 
| zcard key | 返回key中元素个数 | zcard rank | 
127.0.0.1:6379> zadd rank 3000 Trxcx 2000 Zy
(integer) 2
127.0.0.1:6379> zrange rank 0 -1
1) "Zy"
2) "Trxcx"
127.0.0.1:6379> zincrby rank 2000 Zy
"4000"
127.0.0.1:6379> zrange rank 0 -1 withscores
1) "Trxcx"
2) "3000"
3) "Zy"
4) "4000"
127.0.0.1:6379> zrevrange rank 0 -1
1) "Zy"
2) "Trxcx"
127.0.0.1:6379> zrank rank Trxcx
(integer) 0
127.0.0.1:6379> zrevrank rank Trxcx
(integer) 1
127.0.0.1:6379> zcard rank
(integer) 2三、Redis中Zset类型应用场景
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