The last post is mainly about the unsorted set,in this post I will show you the sorted set playing an important
role in Redis.There are many command added after the version 2.8.9.OK,let's see the below picture firstly.There
are 24 commands to handle the sorted set,the same as the string.
playing a important role on sorting.We can use the zadd to store the sorted set.The following example demonstrates
the usage of zadd.
zrange can also make us kNow the scores of the elements,we should open seletion the withscores to
find out their scores.
There are another intresting commands to get the members.zrangebyscore can find out the members by
their scores.For an instance,I want to find out the members' scores between 0 and 6,so I will use score -
zrangebylex can find out the members by the lexicographical order when some of them are in
the same scores.Now I want to find out the members that order by lexicography when the score are the same
while in the range (a,k],so using - (a [k can easily do this job.
we use zrevrank .For example,we want to kNow the member d's rank.
There are also many command that we can use to remove the member from the set.Using zrem to remove one or
more members,Using zremrangebyrank to remove the members by their ranks.Using the zremrangebyscore to remove
the members by their scores.Using the zremrangebylex to remove the members by their rank and lexicography.
we use score - e .For learning how many members in the set by the range of score,we can use zcount
to get the amount.To get the amount of the set by the score's range [0,10],we can use - .
Can we modify the scores of the members?Of course we can.Not only the exists member but also the
member not in the set.If the member not exists in the set,Redis will store a new member to the set.For
example,I want to modify the score of d which is not exists in the set.I will use - d to finish
this easy job.And the result is that the set will has a new member with score 1.
OK,thoes commands are what I want to show you for sorted set.Let's go on to see how StackExchange.Redis
Handle the sorted set.