Redis sorted set类型

Redis sorted set类型

sorted set类型是按照score排序的唯一键的集合。例如我们可以做排行榜等实现。

 

sorted set类型操作。

zadd命令

zadd命令通过score排序然后添加所有指定的member到sort set中。如果member已经存在于sortset中，则修改该member对应的score值。不存在则创建该member。

[XX|NX] NX not exists,只有不存在时，会创建该member, XX只有存在修改该成员的score。

127.0.0.1:6379> help zadd

  ZADD key [NX|XX] [GT|LT] [CH] [INCR] score member [score member ...]
  summary: Add one or more members to a sorted set, or update its score if it already exists
  since: 1.2.0
  group: sorted_set

127.0.0.1:6379> zadd sortset1 1 oracle 2 mysql 3 postgres 4 sqlserver 5 mongodb 6 redis
(integer) 6

 

zrange命令

zrange命令用来查询sorted set类型。

127.0.0.1:6379> help zrange

  ZRANGE key min max [BYSCORE|BYLEX] [REV] [LIMIT offset count] [WITHSCORES]
  summary: Return a range of members in a sorted set
  since: 1.2.0
  group: sorted_set

127.0.0.1:6379> zrange sortset1 0 10 withscores
 1) "oracle"
 2) "1"
 3) "mysql"
 4) "2"
 5) "postgres"
 6) "3"
 7) "sqlserver"
 8) "4"
 9) "mongodb"
10) "5"
11) "redis"
12) "6"