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Redis data type

2022-07-24 18:37:00 【51CTO】

redis There are five data types , Include -string、-list、-set、-sort set、-hash

Simple introduction to use

-string

string For the simplest type , And Memcached Same type , One key Corresponding to one value, It supports operations with Memcached Similar to , It has more functions , Set the object that can store binary .

stay redis Under the directory of redis-cli You can enter redis The command line （ You can enter directly without setting a password ）

Example ： save string Data of type

redis-cli    Go to the command line 

#127.0.0.1:6379> set mykey 123   	     Use set  Specify a name  mykey  For the name   123  For its value 
OK                              	     The return result is  ok
#127.0.0.1:6379> get mykey                Use get  To get  mykey Value 
"123"                                	 For the returned value 
#127.0.0.1:6379> MSET k1 1 k2 2 ke3 3	 Use mset  Define multiple key value pairs   k1  The value of is 1 k2 The value of is 2 ...
OK										 The return result is ok 
#127.0.0.1:6379> MGET k1 mykey            Use mget  View multiple return values 
1) "1"
2) "123"


     
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-list

list Is a linked list structure , The main functions are push,pop Get all the values of a range and so on , In operation key The name of the list

Use list structure , It can easily realize the ranking of the latest news and other functions ,list Another application of is message queuing , You can use list Of push The operation will cause the task to exist list in , Then the worker thread uses pop The operation takes the task out for execution

It can be understood as push To press in pop For taking out

Use format as LPUSH 、 LPOP

Example ：

redis-cli    Go to the command line 

#127.0.0.1:6379> LPUSH list1 '123456'    Use lpush  Appoint list1  Push to a 123456 value 
(integer) 1
#127.0.0.1:6379> LPUSH list1 'abcd'      Specify the same list1  Pushing a abcd value 
(integer) 1
#127.0.0.1:6379> LRANGE list1 0 -1	     Use  lrange  see list1 Value （ Sequential display ） 0 -1  It means zero start -1 end 
1) "abcd"
2) "123456"
#127.0.0.1:6379> lpop  list1			 Use lpop  Appoint list1  Can get the value 
"abcd"


     
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-set

set It is the set that adds and deletes elements for the operation of the set , There are operations such as intersection and difference of multiple sets , In operation key The name of a collection

Example ：

redis-cli    Go to the command line 

#127.0.0.1:6379> SADD set1 a      Use sadd  Create a file called set1 Set    Specifies that the element is a
(integer) 1
#127.0.0.1:6379> SADD set1 b      Specify the element again set1 by b
(integer) 1
#127.0.0.1:6379> SMEMBERS set1	  Use smembers  View set set1 Element information of 
1) "a"
2) "b"
#127.0.0.1:6379> SADD set2 a      Create the collection again set2    Specify different elements 
(integer) 1
#127.0.0.1:6379> SADD set2 b
(integer) 1
#127.0.0.1:6379> SADD set2 1
(integer) 1
#127.0.0.1:6379> SMEMBERS set2    see 
1) "a"
2) "1"
3) "b"

#127.0.0.1:6379> SUNION set1 set2	  Use  sunion  see set1 set2   Union 
1) "a"								  The return value indicates that the repetition of two sets is not displayed   Common elements show a 
2) "1"			
3) "b"
#127.0.0.1:6379> SINTER set1 set2     Use  sinter  see   intersection    It only shows that the elements in the two sets have the same 
1) "a"
2) "b"
#127.0.0.1:6379> SDIFF set1 set2      Use sdiff   View difference sets    If not, the following results will be displayed, indicating empty  
(empty array)                         If so, show the difference elements in the two sets 
#127.0.0.1:6379> SREM set1 a          Use srem  Delete the collection set1  Medium  a Elements 
(integer) 1
#127.0.0.1:6379> SMEMBERS set1        Verify deletion 
1) "b"


     
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-sort set

sort set It's an ordered set It is better than set One more. score So that the elements in the set can be raised score Make an orderly order

Example ：

redis-cli    Go to the command line 

#127.0.0.1:6379> ZADD set3 22 aaa         Use zadd  establish set3 aggregate   22 Express sort  aaa Show elements 
(integer) 1
#127.0.0.1:6379> ZADD set3 11 'bbb 123'       You can specify multiple elements   You need to use single quotation marks when there are spaces 
(integer) 1
#127.0.0.1:6379> ZADD set3 33 'ccc 123'
(integer) 1
#127.0.0.1:6379> ZADD set3 44 'ddd 123'
(integer) 1
#127.0.0.1:6379> ZRANGE set3 0 -1           Use zrange  see    Return results   according to  sort Sort the size of 
1) "bbb 123"                                0 -1  Express 0 Start   To -1 end 
2) "aaa"
3) "ccc 123"
4) "ddd 123"
#127.0.0.1:6379> ZREVRANGE set3 0 -1    Use zrevrange  Carry out the alignment set3 The elements of the set follow sort The size of    
1) "ddd 123"
2) "ccc 123"
3) "aaa"
4) "bbb 123"


     
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-hash

hash stay Memcached in We often package structured information into hashmap, The value stored as a string after serialization on the client ,（ It's usually JSON Format ）

Example ：

redis-cli    Go to the command line 

#127.0.0.1:6379> HSET hash1 aaa 111     Use hset  Appoint hash1  aaa Is a child element   111 Is the value of the child element 
(integer) 1
#127.0.0.1:6379> HSET hash1 bbb 222     by shah1  Add three pairs of elements and assign values respectively 
(integer) 1
#127.0.0.1:6379> HSET hash1 ccc 333
(integer) 1
#127.0.0.1:6379> HGET hash1 aaa    Use hget  Appoint hash1  see aaa The value of the element 
"111"
#127.0.0.1:6379> HGET hash1 bbb
"222"
#127.0.0.1:6379> HGETALL hash1     Use hgetall  Appoint hash1  Show all elements and values 
1) "aaa"
2) "111"
3) "bbb"
4) "222"
5) "ccc"
6) "333"


     
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