Redis quick start

Redis

Concept

redis It is a high-performance non relational database . The storage form is key-value.

Characteristics of non relational database

1. There is no correlation between the data
2. Data stored in memory

Download and install

1. Official website ：https://redis.io
2. Chinese net ：http://www.redis.net.cn
3. Decompression can be used directly
   • redis.windows.conf: The configuration file
   • redis-cli.exe:redis The client of
   • redis-server.exe:redis Server side of

The command operation

1. redis Data structure of

   • redis What's stored is ：key-value Formatted data , among key All strings ,value Yes 5 Different data structures
     • value Data structure of
       • String type ：string
       • Hash type ：hash：map Format
       • List the type ：list：linkedlist Format
       • Collection types ：set;
       • Ordered set type ：sortedset

2. String type string

   1. Storage ：set key value
   2. obtain ：get key
   3. Delete ：del key

3. Hash type hash

   1. Storage ：hset key field value

   2. obtain ：hget key field

      ​ hgetall key( Get all field Of value)

   3. Delete ：hdel key field

4. List the type list Head and tail interpolation can be used

   1. Storage ：lpush key value( The first interpolation )

      ​ rpush key value( The tail interpolation )

   2. obtain ：lrange key start end : Scope acquisition

   3. Delete ：lpop key Delete the leftmost element , And return the element to

      ​ rpop key Delete the rightmost element , And return the element to

5. Collection types set

   1. Storage ：sadd key value
   2. obtain ：smembers key
   3. Delete ：srem key value

6. General Command

   1. keys *： Query all the keys
   2. type key： Get the key corresponding to value type
   3. del key： Delete key

Persistence

1. redis It's a memory database , When redis Server restart , Or restart the computer , Data will be lost , We can redis The data in memory is persisted and saved to the file on the hard disk

2. redis Persistence mechanism ：

   1. RDB： Default mode , There is no need to configure , This mechanism is used by default

      At certain intervals , testing key The change of , Then persist the data

   2. AOF： How to log , The operation of each command can be recorded . You can persist data after every operation

Jedis

1. Introduce dependencies

   <dependency>
               <groupId>redis.clients</groupId>
               <artifactId>jedis</artifactId>
               <version>2.7.0</version>
           </dependency>
   

2. test

   public class JedisTest {
         
       private Jedis jedis;
   
       @BeforeEach
       void setup(){
         
   //  Establishing a connection 
           jedis = new Jedis("127.0.0.1",6379);
   //  Select database 
           jedis.select(0);
       }
   
       @Test
       void testString(){
         
           // In the data 
           String result = jedis.set("name","zhangsan");
           System.out.println("result=" + result);
           // get data 
           String name = jedis.get("name");
           System.out.println("name=" + name);
       }
   
       @AfterEach
       void tearDown(){
         
           if (jedis != null){
         
               jedis.close();
           }
       }
   }
   

SpringDataRedis

Spring-data-redis yes spring Part of a large family , Provided in srping Access through simple configuration in the application redis service , Yes reids Underlying development package (Jedis, JRedis, and RJC) It's highly encapsulated ,RedisTemplate Provides redis Various operations 、 Exception handling and serialization , Support publish subscription , Also on spring 3.1 cache Implemented .

spring-data-redis in the light of jedis The following functions are provided ：

 Connection pool automatic management , Provides a highly encapsulated “RedisTemplate” class 

 in the light of jedis There are a lot of api It is classified and packaged , Encapsulate the same type of operation as operation Interface 

    ValueOperations： Simple K-V operation 

    SetOperations：set Type data operation 

    ZSetOperations：zset Type data operation 

    HashOperations： in the light of map Type of data operation 

    ListOperations： in the light of list Type of data operation