（1）string
This is the most basic type, and nothing to say, is an ordinary set and get, do simple kv cache
（2）hash
This is a structure similar to the map, this is to be generally structured data, such as an object (if the object is not nested other objects) to cache redis, and then each read and write the cache, they can on the operation hash in a field.
key=150
value={
“id”: 150,
"Name": "zhangsan",
“age”: 20
}
Hash class data structure is mainly used to store a number of objects, some simple objects to be cached, when the subsequent operations, you can directly modify only the value of a field in the object
value={
“id”: 150,
"Name": "zhangsan",
“age”: 21
}
（3）list
Ordered list, which can play a lot of tricks
Weibo, a big fan of v, you can go on redis cached list format
a big key = v
value = [zhangsan, lisi, wangwu]
For example, by storing a list of some type of list data structure, similar to the fan list, review the list of things like
For example, by lrange command, is to start reading the number of elements from an element, you can implement paging list based on a query, this is a great feature, based on simple, high-performance redis page, you can do a similar kind of microblogging continue to drop down paging things, high performance, go from page to page
Example, can put forward a simple message queue, into the dislike list head, tail, where it comes out from the list
（4）set
Unordered collection, automatic de-duplication
Set directly on the system need to re-thrown to the data, automatically give weight to, and if you need some quick global data de-duplication, of course, you can go heavy on jvm memory of HashSet, but if you deploy a system on multiple machines?
Redis have to be based on the overall weight set to go
Can be set to play an intersection, union, difference-based operations, such as the intersection of it, you can put two people in a whole list of fans intersection, take a look at two people who in common is that? Right
V The two large fans are placed in set two, do the intersection of two set
（5）sorted set
Sort of set, but can be re-sorted to write into the time to a fraction, according to scores automatically sort, this can play a lot of tricks, the biggest feature is to have a score can be custom collations
For example, if you want to sort the data according to the time when, you can write into it by a certain time as the score, people automatically give you sort by time
Ranking: each user and its corresponding fraction of what is written inside, zadd board score username, then zrevrange board 0 99, the user can get the top 100; zrank board username, the user can see the charts in the ranking
zadd board 85 zhangsan
zadd board 72 wangwu
zadd board 96 lisi
zadd board 62 zhaoliu
96 lysis
85 zhangsan
72 wangwu
62 zhaoliu
zrevrange board 0 3
Users get top 3
96 lysis
85 zhangsan
72 wangwu
zrank board zhaoliu
4