Redis basic data learning record (I)

 

set key （different type）value

key It's worth it ,

 

1、 String type

set name james

Set value when it does not exist

setnx name test

set age 23 ex 10

Set the timeout to 10 second

 

2.hash type

hset user:001 name james

Set up multiple groups

hmset user:001 name james age 15

Get all values

hgetall user:001  

obtain key All of the field

hkeys user:2

Delete field

hdel user:1 age

3.list type

 rpush james c b a // Insert from right to left cba, Return value 3          

lrange james 0 -1 // Get all elements of the list from left to right return c b a          

lpush key c b a // Insert... From left to right cba          

linsert james before b teacher 

4.set type

 exists user    // Check user Whether the key value exists  sadd user a b c// towards user Insert 3 Elements , return 3  

sadd user a b  // If you add the same element , Repeat is invalid , return 0  

smember user // obtain user All elements of , The returned results are out of order    srem user a   // return 1, Delete a Elements    

scard user    // return 2, Count the number of elements

5. Orderly zset type

   zadd key score member [score member......]  

 zadd user:zan 200 james //james I like it 1, Returns the number of successful operations 1    

zadd user:zan 200 james 120 mike 100 lee// return 3    

zadd test:1 nx 100 james   // key test:1 Must not exist , Mainly used to add    

zadd test:1 xx incr 200 james   // key test:1 There must be , It is mainly used to modify , This is the case 300    

zadd test:1 xx ch incr -299 james // Return operation result 1,300-299=1        

zrange test:1 0 -1 withscores  // View likes （ fraction ） And member name        

zcard test:1     // Count the number of members , return 1 Ranking scenario ：    

zadd user:3 200 james 120 mike 100 lee// Insert data first    

zrange user:3 0 -1 withscores // View scores and members    

zrank user:3 james  // Return to rank ： The first 3 Name return 2, from 0 Start to 2, common 3 name  

zrevrank user:3 james // return 0, Reverse sort , The higher the number of likes , Top of the list

 

6. Overall, some instructions

  1） Look at all the keys ：              

keys *   set school enjoy   set hello world    

2） Total number of keys ：              dbsize       //2 Key , If there are a lot of keys , It is forbidden to use this instruction online    

3） Check if the key exists ：              exists key  // There is returned 1, There is no return 0    

4） Delete key ：              del key      //del hello school, Returns the number of delete keys , Delete the nonexistent key and return to 0    

5） Key expired ：              expire key seconds        //set name test  expire name 10, Express 10 Seconds expired              

                                   ttl key                            // View remaining expiration time    

6） The data structure type of the key ：              type key //type hello     // return string, Key does not exist return none