Small shellfish _redis set/zset type Learning

Redis set, Zset type

First, collection type

Second, view set, Zset collection type command

Example of Set, Zset set type

First, collection type

1, the collection type of Redis, is divided into two kinds, namely order and disorder.

2, since it is a collection type, so it is also to meet the characteristics of the collection

A, the certainty of a set: the nature of the elements that make up the set must be clear, not ambiguous, vague situations

b, the cross-anisotropy of a set: For a given set, the elements in the collection are different ", that is," for a given set, any two of its elements are distinct

C, the disorder of a set: When a collection is represented, the elements that make up the set are unordered

3. Set Classification ( Assuming that both set a and set B are non-null)

A, the assembly: the elements of the public part of collection A and set B are removed, and a new collection is formed

B, intersection: Gets the elements of the Announcements section of collection A and set B, forming a new collection

C, Empty set: The collection of NULL elements

second, view set, Zset collection type command

1. Set type command description

Command name	Format	Description
Sadd	Sadd Key Member	Add the member element to the key
Srem	Srem Key Member	Removes the element from the collection key member
Smembers	Smembers Key	Enumerate all elements of the collection key
Sismembers	Sismembers Key Member	Determines whether the member element is a collection key element
SCard	SCard Key	Gets the number of elements of the collection key
Smove	Smove Source Destination Member	Move the member element from the source collection to the destination collection
Spop	Spop Key	Removes and returns a random element in the collection
Srangmember	Srangmember Key	Returns a random element in the collection
Sinter	Sinter Key Key1 ...	Returns all the members of a collection that are the intersection of all given collections. A nonexistent key is considered an empty set. When there is an empty set in a given collection, the result is also an empty set (according to the Law of collection Operations).
Sinterstore	Sinterstore Destination Key Key1 ...	This command is equivalent to sinter, but it saves the result to the destination collection instead of simply returning the result set. If the destination collection already exists, overwrite it
Sunion	Sunion Key Key1	Returns all the members of a collection, which is the set of all the given collections. Non-existent key is considered an empty set
Sunionstore	Sunionstore Destination Key Key1 ...	This command is equivalent to Sunion, but it saves the result to the destination collection instead of simply returning the result set. If the destination already exists, overwrite it
Sdiff	Sdiff Key Key1	Returns all members of a collection, which is the difference set for all given collections. Non-existent key is considered an empty set
Sdiffstore	Sdiffstore Destination Key Key1 ...	This command is equivalent to Sdiff, but it saves the result to the destination collection instead of simply returning the result set. If the destination collection already exists, overwrite it

2. Zset Type command description

Command name	Format	Description
Zadd	Zadd Key Score Member	Add the member element and its score value to the ordered set key. The score value can be an integer value or a double-precision floating-point number.
Zrem	Zrem Key Member	Removes the member member in the ordered set key and does not perform any action if member is not a member of an ordered set. An error is returned when key exists but is not an ordered set type
Zcard	Zcard Key	Returns the cardinality of an ordered set key
Zcount	Zcount Key min Max	Returns a member of the ordered set key with the score value between Min and Max (by default including the score value equals min or max)
Zscore	Zscore Key Member	Returns the score value of the member member in the ordered set key
Zincrby	Zincrby Key Increment member	Adds an increment increment to the score value of the member member of the ordered set key
Zrange	Zrange key start stop [Withscores]	Returns the member of the ordered set key, within the specified interval. Where members are sorted by score value (small to large)
Zrevrange	Zrevrange key start stop [Withscores]	Returns the member of the ordered set key, within the specified interval. Where members are placed in descending order of score values (from large to small)
Zrangebyscore	Zrangebyscore key min Max [withscores] [LIMIT offset Count]	Returns the ordered set key, where all score values are between Min and Max (including equals min or Max) members. Ordered set members are ascending (from small to large) in order of score values
Zrevrangebyscore	Zrevrangebyscore key Max min [withscores] [LIMIT offset Count]	Returns the ordered set key, where the score value is between Max and Min (the default includes all members equal to Max or min). Ordered set members are arranged in descending order of score values (from large to small).
Zrank	Zrank Key Member	Returns the rank of the member member in the ordered set key. Where ordered set members are arranged in ascending order of score values (from small to large). The ranking is based on 0, meaning that the member with the lowest score value is ranked at 0.
Zrevrank	Zrevrank Key Member	Returns the rank of the member member in the ordered set key. Where ordered set members are sorted by score values descending (from large to small). The rankings are based on 0, which means that the members with the largest score value rank 0.
Zremrangebyrank	Zremrangebyrank Key Start stop	In addition to the ordered set key, all members within the rank (rank) range are specified. The interval is indicated by the following standard parameter, start and stop, including start and stop.
Zremrangebyscore	Zremrangebyscore Key min Max	Remove ordered set key, all score values between Min and Max, including members equal to Min or max
Zinterstore	Zinterstore destination Numkeys key [key ...] [WEIGHTS weight [weight ...] [AGGREGATE sum| min| MAX]	Computes the intersection of one or more ordered sets given, where the number of a given key must be specified with the Numkeys parameter
Zunionstore	Zunionstore destination Numkeys key [key ...] [WEIGHTS weight [weight ...] [AGGREGATE sum| min| MAX]	Calculates the set of a given one or more ordered sets, where the number of a given key must be specified with the Numkeys parameter. By default, the score value of a member in the result set is the score value of that member under all given sets

3. Set type Command example

3.1. Add element ' Xiaobei ' for collection user

127.0.0.1:6379> Sadd User Xiaobei

(integer) 1

3 . 2. View all elements of the collection user

127.0.0.1:6379>smembers User

1) "Xiaobei"

3.3, determine whether Xiaobei is the element of the collection user

127.0.0.1:6379>sismember User Xiaobei

(integer) 1

3.4. Remove the elements from the collection user Xiaobei

127.0.0.1:6379> Sremuser Xiaobei

(integer) 1

3.5. Determine the number of set user

127.0.0.1:6379> Sadduser Xiaobei

(integer) 1

127.0.0.1:6379> Sadduser Script-boy

(integer) 1

127.0.0.1:6379>scard User

(integer) 2

3.6. Move the element script-boy of the set user to the set User1

127.0.0.1:6379>smove User User1 Script-boy

(integer) 1

127.0.0.1:6379>smembers user1

1) "Script-boy"

3.7. Set user and set User1

127.0.0.1:6379>smembers User

1) "Script-boy"

2) "Xiaobei"

127.0.0.1:6379>smembers user1

1) "Script-boy"

127.0.0.1:6379>sinter User User1

1) "Script-boy"

3.8. Save the intersection of Set user and set User1 in User2

127.0.0.1:6379>sinterstore user2 User1 user

(integer) 1

127.0.0.1:6379>smembers User2

1) "Script-boy"

3.9. Set user and set User1

127.0.0.1:6379>sunion User User1

1) "Script-boy"

2) "Xiaobei"

3.10, the collection of user and set User1 save in User2

127.0.0.1:6379>sunionstore User2 User User1

(integer) 1

127.0.0.1:6379>smembers User2

1) "Script-boy"

3.11. Finding the difference set of set User1 to set user

127.0.0.1:6379>smembers User

1) "Script-boy"

127.0.0.1:6379>smembers user1

1) "Script-boy"

2) "Xiaobei"

127.0.0.1:6379>sdiff User1 user

1) "Xiaobei"

3.12. Save the set User1 to set user's difference set in User2

127.0.0.1:6379>sdiffstore user2 User1 user

(integer) 1

127.0.0.1:6379>smembers User2

1) "Xiaobei"

Copyright NOTICE: This article for Bo Master original article, without Bo Master permission not reproduced.

Small shellfish _redis set/zset type Learning