How to use redis ordered collection

Redis How to use ordered sets

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Redis data structure ： Ordered set

An orderly collection . Each element consists of a member and a score associated with the member , Members are stored as strings , Score in 64 Bit double precision floating-point number storage . Members cannot be duplicated , Sort by score , Sort in member dictionary order when the same score .

data structure

• character string

• hash

• list

• aggregate

• Ordered set

• HyperLogLog

• Bitmap

• Geographical coordinates

• flow

Ordered set （sorted set）

• Add or update members
  1.zadd command    Format ：zadd key [NX|XX] [GT|LT] [CH] [INCR] score member [score member …]
  Returns the number of new members successfully added , If the execution is to update the member score, return 0.
  zadd key score member [score member ...]
  
  XX The function of the option is to update only without adding , Go back to 0.
  zadd key XX score member [score member ...]
  
  NX The function of the option is to add only without updating , The number of added elements returned after successful execution .
  zadd key NX score member [score member ...]
  
  CH The function of this option is to return the number of members modified rather than the number of members successfully added , Modified including newly added .
  zadd key CH score member [score member ...]
  

• Remove the specified member
  1.zrem command    Format ：zrem key member [member …]
  Returns the number of removed members , Automatically ignore when members do not exist in the collection .
  zrem key member [member ...]
  

• 2.zremrangebyrank command    Format ：zremrangebyrank key start stop
  Remove members within the specified ranking range , Returns the number of removed members , The ranking can be positive or negative .
  zremrangebyrank key start stop
  
  3.zremrangebyscore command    Format ：zremrangebyscore key min max
  Remove members within the specified score range , Returns the number of removed members .min or max Before to add “(” It means that the open interval does not contain boundary values .
  zremrangebyscore key min max
  
  4.zremrangebylex command    Format ：zremrangebylex key min max
  For an ordered set arranged in dictionary order （ That is, the score is the same ）, Remove members within the specified lexicographic range . Returns the number of removed members ,min、max Of Value for Include ： belt “[” The value of indicates that the dictionary order boundary is included , belt “(” Indicates that the dictionary order boundary is not included ,“+” Infinity ,“-” Represents infinitesimal .
  zremrangebylex key min max
  

• Pop up elements
  1.zpopmax command    Format ：zpopmax key [count]
  Pop up the one with the highest score count Members , When there are multiple elements with the highest score, the member with the largest dictionary order pops up , If not specified count Default 1 individual , After execution, return the member and score of the ejected element .
  zpopmax key [count]
  
  2.zpopmin command    Format ：zpopmin key [count]
  Pop up the lowest score count Members , When there are multiple elements with the lowest score, the member with the lowest dictionary order will pop up , If not specified count Default 1 individual , After execution, return the member and score of the ejected element .
  zpopmin key [count]
  3.bzpopmax command    Format ：bzpopmax key [key …] timeout
  Blocking zpopmax command ,timeout Second accuracy . The command checks the given ordered set in turn , And pop up the element with the largest score from the first non empty set , Otherwise, block the current client until there are elements or it returns after the timeout nil. A list will be returned when the element is successfully popped , Contains the ordered set of ejected elements 、 Members and scores .
  bzpopmax key [key ...] timeout
  
  4.bzpopmin command    Format ：bzpopmin key [key …] timeout
  Blocking zpopmin command ,timeout Second accuracy . The command checks the given ordered set in turn , And pop up the element with the lowest score from the first non empty set , Otherwise, block the current client until there are elements or it returns after the timeout nil. A list will be returned when the element is successfully popped , Contains the ordered set of ejected elements 、 Members and scores .
  bzpopmin key [key ...] timeout
  
  client 2：
  

• Get member score
  1.zscore command    Format ：zscore key member
  Get the score of a given member , When the collection does not exist or the member does not exist nil.
  zscore key member
  

• Calculate the member score
  1.zincrby command    Format ：zincrby key increment member
  After execution, return the current member score ,increment It is timing self increase , Otherwise, it is self subtraction ; If the key does not exist or the member does not exist, perform the create operation .
  zincrby key increment member
  

• Get the number of members
  1.zcard command    Format ：zcard key
  Returns the number of members contained in the collection , Returns... When the collection does not exist 0.
  zcard key
  
  2.zcount command    Format ：zcount key min max
  Get the number of members within the specified score range ,min or max Before to add “(” It means that the open interval does not contain boundary values , value +inf Infinity ,-inf Represents infinitesimal .
  zcount key min max
  
  3.zlexcount command    Format ：zlexcount key min max
  For an ordered set arranged in dictionary order （ That is, the score is the same ）, Get the number of members in the specified dictionary order range ,min、max Of Value for Include ： belt “[” The value of indicates that the dictionary order boundary is included , belt “(” Indicates that the dictionary order boundary is not included ,“+” Infinity ,“-” Represents infinitesimal .
  zlexcount key min max
  

• Get member rankings
  1.zrank command    Format ：zrank key member
  Return the ascending ranking of members , Returns when the collection or member does not exist nil.
  zrank key member
  
  2.zrevrank command    Format ：zrevrank key member
  Return the descending ranking of members , Returns when the collection or member does not exist nil.
  zrevrank key member
  

• Get members
  1.zrange command    Format ：zrange key min max [BYSCORE|BYLEX] [REV] [LIMIT offset count] [WITHSCORES]
  Gets the members within the specified index range , Sort in ascending order according to the score .WITHSCORES Option can return the score after the command is executed , Returns the odd digits of the list as members , Even digits are corresponding scores . Returns... When the collection does not exist empty.
  zrange key min max [WITHSCORES]
  
  2.zrevrange command    Format ：zrevrange key start stop [WITHSCORES]
  Gets the members within the specified index range , Arrange in descending order according to the score .WITHSCORES Option can return the score after the command is executed , Returns the odd digits of the list as members , Even digits are corresponding scores . Returns... When the collection does not exist empty.
  zrevrange key start stop [WITHSCORES]
  
  3.zrangebyscore command    Format ：zrangebyscore key min max [WITHSCORES] [LIMIT offset count]
  Get the members within the specified score range , Sort in ascending order according to the score .WITHSCORES Option can return the score after the command is executed , Returns the odd digits of the list as members , Even digits are corresponding scores . Returns... When the collection does not exist empty.
  zrangebyscore key min max [WITHSCORES] [LIMIT offset count]
  
  [LIMIT offset count] The function of option is to limit the number of returned members ,offset Specify the number of members to skip ,count Execute the maximum number of returned members ,count Take the absolute value when it is negative .
  
  min or max Before to add “(” It means that the open interval does not contain boundary values , value +inf Infinity ,-inf Represents infinitesimal .
  
  4.zrevrangebyscore command    Format ：zrevrangebyscore key max min [WITHSCORES] [LIMIT offset count]
  Get the members within the specified score range , Arrange in descending order according to the score , Be careful max min The order .
  zrevrangebyscore key max min [WITHSCORES] [LIMIT offset count]
  
  5.zrangebylex command    Format ：zrangebylex key min max [LIMIT offset count]
  When the members have the same score , Get the members in the specified dictionary order range , Arrange in ascending dictionary order ,min、max Of Value for Include ： belt “[” The value of indicates that the dictionary order boundary is included , belt “(” Indicates that the dictionary order boundary is not included ,“+” Infinity ,“-” Represents infinitesimal .
  zrangebylex key min max [LIMIT offset count]
  
  6.zrevrangebylex command    Format ：zrevrangebylex key max min [LIMIT offset count]
  When the members have the same score , Get the members in the specified dictionary order range , Arrange in descending dictionary order ,max、min Of Value for Include ： belt “[” The value of indicates that the dictionary order boundary is included , belt “(” Indicates that the dictionary order boundary is not included ,“+” Infinity ,“-” Represents infinitesimal .
  zrevrangebylex key max min [LIMIT offset count]

• Set operations
  1. Combine
   1)zunionstore command    Format ：zunionstore destination numkeys key [key …] [WEIGHTS weight] [AGGREGATE SUM|MIN|MAX]
  numkeys Is the number of sets involved in the operation , Return when it doesn't correspond error, After execution, return the number of members of the new set . The result of union is the member set , If there are the same members in the set participating in the operation , By default, the member score of the new set is the sum of the member scores of the original set .
  zunionstore destination numkeys key [key ...]
  
  AGGREGATE The function of the option is to specify the aggregate function to be used , If not specified, default SUM.SUM Point value addition ,MIN Refers to the minimum score ,MAX Refers to the maximum score .
  zunionstore destination numkeys key [key ...] [AGGREGATE SUM|MIN|MAX]
  
  WEIGHTS The function of this option is to set a weight for each set before performing aggregation , The weights are multiplied by the scores of the members in the set to get new scores , Then perform aggregation calculation .
  
   2)zunion command    Format ：zunion numkeys key [key …] [WEIGHTS weight] [AGGREGATE SUM|MIN|MAX] [WITHSCORES]
  After execution, return to the new collection member .
  zunion numkeys key [key ...] [WEIGHTS weight] [AGGREGATE SUM|MIN|MAX] [WITHSCORES]
  2. intersection
   1)zinterstore command    Format ：zinterstore destination numkeys key [key …] [WEIGHTS weight] [AGGREGATE SUM|MIN|MAX]
  After execution, return the number of members of the new set .
  zinterstore destination numkeys key [key ...] [WEIGHTS weight] [AGGREGATE SUM|MIN|MAX]
   2)zinter command    Format ：zinter numkeys key [key …] [WEIGHTS weight] [AGGREGATE SUM|MIN|MAX] [WITHSCORES]
  After execution, return to the new collection member .
  zinter numkeys key [key ...] [WEIGHTS weight] [AGGREGATE SUM|MIN|MAX] [WITHSCORES]
  Be careful ：
  1. Set operation can use set as input , By default , The score of set members is regarded as 1 Participate in operation , You can use WEIGHTS Option set the weight to change the set score .

• Common use
  1. Ranking List
  2. Timeline

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