redis中使用zincrby和zrevrange、zrange实现排行榜功能

ZINCRBY

• 语法：ZINCRBY key increment member
• 为有序集 key 的成员 member 的 score 值加上增量 increment

ZREVRANGE

• 语法：ZREVRANGE key start stop [WITHSCORES]
• 返回有序集 key 中，指定区间内的成员。

成员按 score 值递减(从大到小)的次序排列

ZRANGE

• 语法：ZRANGE key start stop [WITHSCORES]
• 返回有序集 key 中，指定区间内的成员

成员按 score 值递增(从小到大)来排列

代码实践

127.0.0.1:6379> zincrby popular_posts 1 101
"1"
127.0.0.1:6379> zincrby popular_posts 1 101
"2"
127.0.0.1:6379> zincrby popular_posts 1 101
"3"
127.0.0.1:6379> zincrby popular_posts 1 102
"1"
127.0.0.1:6379> zincrby popular_posts 1 103
"1"
127.0.0.1:6379> zincrby popular_posts 1 104
"1"
127.0.0.1:6379> zincrby popular_posts 1 105
"1"
127.0.0.1:6379> zincrby popular_posts 1 105
"2"
127.0.0.1:6379> zincrby popular_posts 1 105
"3"
127.0.0.1:6379> zincrby popular_posts 1 105
"4"
127.0.0.1:6379> zincrby popular_posts 1 105
"5"
127.0.0.1:6379> zincrby popular_posts 1 105
"6"
127.0.0.1:6379> zrange popular_posts 0 2
1) "102"
2) "103"
3) "104"
127.0.0.1:6379> zrange popular_posts 0 2 withscores
1) "102"
2) "1"
3) "103"
4) "1"
5) "104"
6) "1"
127.0.0.1:6379> zrevrange popular_posts 0 2 withscores
1) "105"
2) "6"
3) "101"
4) "3"
5) "104"
6) "1"
127.0.0.1:6379>

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