Redis General Command

1.String type

String Three types of formats

• character string : Normal string
• int type ： Integer types , Can do self increasing , Since the reduction of operating
• float type ： Floating point type , You can do auto increase and auto decrease
• Redis Of key Format ：[ Project name ]：[ Business name ]：[ type ]：[id]
  

2.Hash type

Hash type , Also called hash , Its value It's an unordered Dictionary , Be similar to Java Medium HashMap structure .
practice ：

3.List type

Redis Medium List The type and Java Medium LinkedList similar , It can be regarded as a two-way linked list structure . It can support both forward and reverse retrieval .
Same characteristics LinkedList

• Orderly
• Elements can be repeated
• Insert and delete fast
• The query speed is average
  practice ：
  

4.Set type

Redis Of Set Structure and Java Medium HashSet be similar , Can be seen as a value by null Of HashMap. Because it is also a Hash surface , So it also has HashSet Similar features ：

• disorder
• Element is not repeatable
• Quick search
• Support intersection 、 Combine 、 Difference set and other functions

practice ：

5.SortSet type

Redis Of SortSet It's a sortable set aggregate , And Java Medium treeSet Some similar , But the underlying data structure is very different .SortSet Each element in the has a score attribute , Can be based on score Attribute to sort elements , The bottom implementation is a jump table plus hash surface
SortedSet It has the following characteristics ：

• Sortable
• Element is not repeatable
• Fast query speed
  because SortedSet SORTABILITY of , Often used to implement functions like leaderboards