redis之Zset数据类型以及存储原理

文章目录

• ​​1.概述​​
• ​​2.常用命令​​

• ​​2.1.添加value:ZADD page_rank 10 google.com​​
• ​​2.2.获取所有元素:zrange page_rank 0 -1 withscores​​
• ​​2.3.获取所有元素(根据重要性倒叙):zrevrange page_rank 0 -1 withscores​​
• ​​2.4.获取score范围的value:zrangebyscore：page_rank 9 10​​
• ​​2.5.获取score范围的value个数：zcount page_rank 9 10​​
• ​​2.6.返回value的排名:zrank page_rank www.qq.com​​
• ​​2.7.获取value的分值score:zscore page_rank google.com​​
• ​​2.8.提高value的分值score： zincrby page_rank 1 google.com​​

• ​​3.存储原理​​
• ​​4.应用场景​​

• ​​4.1.热搜排名​​

1.概述

2.常用命令

2.1.添加value:ZADD page_rank 10 google.com

其中10是score，可以认为

127.0.0.1:6379> ZADD page_rank 10 google.com
(integer) 1
127.0.0.1:6379> zrange page_rank 0 -1
1) "google.com"
127.0.0.1:6379> zrange page_rank 0 -1 withscores
1) "google.com"
2) "10"
127.0.0.1:6379>

同时添加

127.0.0.1:6379> zadd page_rank 9 www.baidu.com 8 www.qq.com
(integer) 2
127.0.0.1:6379> zrange page_rank 0 -1 withscores
1) "www.qq.com"
2) "8"
3) "www.baidu.com"
4) "9"
5) "google.com"
6) "10"
127.0.0.1:6379>

2.2.获取所有元素:zrange page_rank 0 -1 withscores

127.0.0.1:6379> zrange page_rank 0 -1 withscores
1) "www.qq.com"
2) "8"
3) "www.baidu.com"
4) "9"
5) "google.com"
6) "10"
127.0.0.1:6379>

2.3.获取所有元素(根据重要性倒叙):zrevrange page_rank 0 -1 withscores

127.0.0.1:6379> zrevrange page_rank 0 -1 withscores
1) "google.com"
2) "10"
3) "www.baidu.com"
4) "9"
5) "www.qq.com"
6) "8"
127.0.0.1:6379>

2.4.获取score范围的value:zrangebyscore：page_rank 9 10

127.0.0.1:6379> zrevrange page_rank 0 -1 withscores
1) "google.com"
2) "10"
3) "www.baidu.com"
4) "9"
5) "www.qq.com"
6) "8"
127.0.0.1:6379> 
127.0.0.1:6379> 
127.0.0.1:6379> zrangebyscore page_rank 9 10
1) "www.baidu.com"
2) "google.com"
127.0.0.1:6379>

2.5.获取score范围的value个数：zcount page_rank 9 10

127.0.0.1:6379> zcount page_rank 9 10
(integer) 2
127.0.0.1:6379>

2.6.返回value的排名:zrank page_rank www.qq.com

返回有序集 key 中成员 member 的排名。其中有序集成员按 score 值递增(从小到大)顺序排列。

127.0.0.1:6379> zrevrange page_rank 0 -1 withscores
1) "google.com"
2) "10"
3) "www.baidu.com"
4) "9"
5) "www.qq.com"
6) "8"
127.0.0.1:6379> zrank page_rank www.qq.com
(integer) 0
127.0.0.1:6379> zrank page_rank www.baidu.com
(integer) 1
127.0.0.1:6379> zrank page_rank google.com
(integer) 2
127.0.0.1:6379>

2.7.获取value的分值score:zscore page_rank google.com

127.0.0.1:6379> zscore page_rank google.com
"10"
127.0.0.1:6379>

2.8.提高value的分值score： zincrby page_rank 1 google.com

127.0.0.1:6379> zscore page_rank google.com
"10"
127.0.0.1:6379> 
127.0.0.1:6379> 
127.0.0.1:6379> zincrby page_rank 1 google.com
"11"
127.0.0.1:6379> zscore page_rank google.com
"11"
127.0.0.1:6379>

3.存储原理

4.应用场景

4.1.热搜排名