Indexed collections sortedset:
Storage requirements: data ordering conducive to efficient data show the need to provide a way can be ordered according to their feature
storage structure required: new storage model, the data can be saved sortable
sorted_set Type: storage structure is set on the basis of Add sortable fields are associated with each element of a fraction of a field type double.
It is to redis from small to large order of the set by scores of members of the field.
1. Storage: Key score1 Zadd the member1 [member2 is score2]
Zadd mysort 60 zhangsan
Zadd mysort 50 Lisi
Zadd mysort 80 wangwu
2. Get: zrange key start stop [WITHSCORES] zrevrange key start stop [WITHSCORES] Reverse ranking score
zrange mysort 0 - 1
zrange mysort 0 -1 withscores
3. 删除：zrem key member [member ...]
zrem mysort lisi
4. Data acquisition conditional:
zrangebyscore key min max [WITHSCORES] [LIMIT offset count]
zrevrangebyscore key max min [WITHSCORES]
5. Conditions delete the data:
zremrangebyrank key start stop
zremrangebyscore key min max
Note:
min max and conditions for the search query defining
start and stop for defining the scope of the query, the role of the index, the index indicates the start and end
offset count for defining the scope of a query, the query results in the effect, indicating the start position of the data bus and the amount
6. Get the total set of data
zcard key
zcount key min max
7. The set intersection and union operations
zinterstore destination numkeys key [key ...] numkeys number of the sets to be operated, after a specified number of key and it is equal to the back
zunionstore destination numkeys key [key ...]
Extended operation types of data sorted_set
Business scene:
Guangdong voted Ten Outstanding Young, all kinds of arts talent audition voting
various resources website TOP10 (movies, songs, documents, e-business, games, etc.)
chat room activity statistics
gaming friends intimacy
Business Analysis: Sort establish the basis for all participating rankings resources
solution:
Obtaining data corresponding index (ranking)
zrank key member
zrevrank key member
score value acquisition and modification
zscore key member
zincrby key increment member
Note sorted_set type of data manipulation
score is stored in the data storage 64, if it is an integer in the range of ~ 9007199254740992. -9,007,199,254,740,992
score stored data may be double the value of a double-precision, double precision floating point based on the feature, the precision may be lost, you should be careful when using
sorted_set underlying storage is set based structure, so that the data can not be repeated, if repeated additions of the same data, score values will be overwritten repeatedly, last modified retention results