Basic knowledge of redis

redis Supported data types  
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1、string ----key value Binary system   Can store pictures or objects  set get                                 

Application scenarios : Count the number of visitors to the website 、 The current number of people online 、 Number of fans
2、hash ----- Set of key value pairs , Used to store objects ,hmset ,hgetall
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string A field of type ,field and value Mapping table

Application scenarios ： modify 、 increase 、 Delete Properties of the user every last hash Can be stored 2 Of 32 Power -1 Key value pairs .
3、list list , A simple list of strings . In insertion order , You can insert data from the head or tail
Application scenarios ： Get the latest news 、 Attention list , Fans list , Spike into the queue ,
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4、set   aggregate disorder Add one string Element to   key Successfully returned in the corresponding set 1   If it already exists return 0  

Application scenarios ：
1： Use intersection Seek common friends ,
2： Using uniqueness Seek the independence of the website ip When it comes to seconds , Ensure that there is only one mobile number , Participate in the second kill
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5、 zset Ordered set If there is   I'll update zset Members are the only
Application scenarios ：
  1： Timeline
  2： Game scoreboard
  3: Player scores change zadd 
  4: score vip Ordinary users First vip