zset命令

zset，排序好的set，默认按分值从小到大排序。

127.0.0.1:6379> zadd fruts 8 apple 2 banana 3 orange
(integer) 3
127.0.0.1:6379> ZRANGE fruts 0 -1
1) "banana"
2) "orange"
3) "apple"

排名情况

127.0.0.1:6379> ZRANK fruts apple
(integer) 2
127.0.0.1:6379> ZRANK fruts banana
(integer) 0
127.0.0.1:6379> ZRANK fruts orange
(integer) 1

可以通过ZRANGE命令按照顺序排名取数，ZRANGEBYSCORE按照分值范围取数，ZREVRANGE是倒序排名取数。

127.0.0.1:6379> ZRANGEBYSCORE fruts 3 9
1) "orange"
2) "apple"
127.0.0.1:6379> ZRANGEBYSCORE fruts 4 9
1) "apple"
127.0.0.1:6379> ZRANGE fruts 0 1
1) "banana"
2) "orange"
127.0.0.1:6379> ZrevRANGE fruts 0 1
1) "apple"
2) "orange"

通过ZINCRBY修改banana的分值，排名自动调整

127.0.0.1:6379> ZINCRBY fruts 2 banana
"4"
127.0.0.1:6379> ZRANGE fruts 0 -1
1) "orange"
2) "banana"
3) "apple"
127.0.0.1:6379> ZSCORE fruts banana
"4"