Redis Tutorial 3--redis key value Design

tag is especially common in Internet applications, first look at the following relational data tables:

Book table:

Id	Name	Author
1	The Ruby programming Language	Mark Pilgrim
2	Ruby on Rail	David Flanagan
3	Programming Erlang	Joe Armstrong

Tag table:

Tag_name	book_id
Ruby	1
Ruby	2
Web	2
Erlang	3

Now use Redis to save the data for these two tables:

Save the book's data:

redis 127.0.0.1:6379> incr book_id # with book_id this Key Save Book of the table ID, every time you want to get a new #book_id self-increment with incr command (integer) 1 #incr command to return 1, then use Key to be book:1 of the Hash to save a Book Object , Object properties are Hash of the Field Redis 127.0.0.1:6379> hset book:1 name "The Ruby programming Language" (integer) 1 Redis 127.0.0.1:6379> hset book:1 Author "Mark Pilgrim" (integer) 1 redis 127.0.0.1:6379> hgetall book:1 # with Hgetall command to test a , return Hash all the properties and values 1) "Name" 2) "The Ruby programming Language" 3) "Author" 4) "Mark Pilgrim" redis 127.0.0.1:6379> incr book_id # Create the Section 2 a Book Object , First incr a book_id Get new Book of the ID (integer) 2 Redis 127.0.0.1:6379> hset book:2 name "Ruby on rail" (integer) 1 Redis 127.0.0.1:6379> hset book:2 Author "David Flanagan" (integer) 1 Redis 127.0.0.1:6379> Hgetall Book:2 1) "Name" 2) "Ruby on Rail" 3) "Author" 4) "David Flanagan" Redis 127.0.0.1:6379> incr book_id (integer) 3 Redis 127.0.0.1:6379> hset book:3 name "Programming Erlang" (integer) 1 Redis 127.0.0.1:6379> hset book:3 Author "Joe Armstrong" (integer) 1 Redis 127.0.0.1:6379> Hgetall Book:3 1) "Name" 2) "Programming Erlang" 3) "Author" 4) "Joe Armstrong"

Save the tag data, use the collection to store the data, because the collection can find the intersection, the set, the difference set:

Redis 127.0.0.1:6379> sadd Tag:ruby 1 (integer) 1 Redis 127.0.0.1:6379> Sadd Tag:ruby 2 (integer) 1 Redis 127.0.0.1:6379> Sadd Tag:web 2 (integer) 1 Redis 127.0.0.1:6379> Sadd Tag:erlang 3 (integer) 1

If you want to get a book that belongs to Ruby and is a Web:

Redis 127.0.0.1:6379> sinter Tag:ruby tag:web 1) "2"

If you want to get a book that belongs to Ruby but doesn't belong to the Web:

Redis 127.0.0.1:6379> Sdiff Tag:ruby tag:web 1) "1"

Collections of books that belong to Ruby and belong to the Web:

Redis 127.0.0.1:6379> sunion Tag:ruby tag:web 1) "1" 2) "2"

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

Redis Tutorial 3--redis key value Design