Redis is the industry's most widely used memory data storage.

Redis supports rich data structures, while supporting data persistence.

Redis properties also provide some type of database, such as transaction, HA, from the master library.

REmote DIctionary Server (Redis) is written by Salvatore Sanfilippo of key-value storage systems.

Redis supports data persistence, you can save data in memory to disk, reboot to load when you can use again

Redis only supports simple key-value data type, and also supports storage list, set, zset, hash data structures, etc.

Redis supports backup data

Supports master-slave synchronization, the data stored in memory, superior performance.

Redis data structures

String (String)

String is redis basic type, a key corresponding to a value

127.0.0.1:6379> set name "runoob"
OK
127.0.0.1:6379> get name
"runoob"

set and get commands, key for the name, value is runoob.

List (list)

Bi-list, for the latest list, watchlist

List is a simple list of strings, sort insertion order. You can add an element to the head or tail of the list

127.0.0.1:6379> lpush runoob redis
(integer) 1
127.0.0.1:6379> lpush runoob mongodb
(integer) 2
127.0.0.1:6379> lpush runoob damin
(integer) 3
127.0.0.1:6379> lrange runoob 0 10
1) "damin"
2) "mongodb"
3) "redis"

lpush into the list, lrange list list

Set (collection)

Suitable for unordered collection, stepped thumbs point, draw, read, common friends

Redis of type String Set is an unordered collection.

Collection is achieved through a hash table, so add, delete, search, is $ O (1) $

$ Asdd $ command: add a string element of the set command to set the corresponding key, the successful return 1 if the element exists, returns 0, key corresponding set does not exist return an error.

127.0.0.1:6379> SADD damin redis
(integer) 1
127.0.0.1:6379> SADD damin mysql
(integer) 1
127.0.0.1:6379> SADD damin mongodb
(integer) 1
127.0.0.1:6379> SADD damin mysql
(integer) 0
127.0.0.1:6379> SMEMBERS damin
1) "mongodb"
2) "mysql"
3) "redis"

SortedSet (ordered set)

List, priority queue

And set the same, zadd is not allowed to repeat a member

Hash (hash)

Object properties, the number of variable length property

It is a key name for the collection

hash particularly suitable for storing objects

127.0.0.1:6379> HMSET user:1 username runoob password runoob points 200
OK
127.0.0.1:6379> HGETALL user:1
1) "username"
2) "runoob"
3) "password"
4) "runoob"
5) "points"
6) "200"

Redis HMSET, HGETALL command, user: 1 is the key

KV: single values, codes, PV, cache

Start Redis

1 2	1, with the cmd command to the root directory redis 2 Execute cmd: redis-server redis.windows.conf

Redis basis

The basic command functions


 * Created by nowcoder on 2016/7/30.
 */

public class  implements InitializingBean {
    private static final Logger logger = LoggerFactory.getLogger(JedisAdapter.class);
    private JedisPool pool;

    public static void print(int index, Object obj) {
        System.out.println(String.format("%d, %s", index, obj.toString()));
    }

    public static void main(String[] argv) {
        Jedis jedis = new Jedis("redis://localhost:6379/9");
        jedis.flushDB();

        // get set
        jedis.set("hello", "world");
        print(1, jedis.get("hello")); //输出hello对应的world
        jedis.rename("hello", "newhello"); //newhello替代hello
        print(1, jedis.get("newhello"));  //指向输出world
        jedis.setex("hello2", 1800, "world");
        print(1,jedis.get("hello2"));

        jedis.set("pv","100");    //点踩功能
        jedis.incr("pv");    //加1
        jedis.incrBy("pv",5); //加5
        print(2,jedis.get("pv"));
        jedis.decrBy("pv",2);  //减2
        print(2,jedis.get("pv"));

        Print ( . 3 , jedis.keys ( "*" ));    // output all tables

        ListName = String "List" ; 
        jedis.del (listName); for ( int I = 0 ; I < 10 ; I ++) {             jedis.lpush (listName, "A" + String.valueOf (I));    // add tABLE         }         Print ( . 4 , jedis.lrange (listName, 0 , 12 is )); // the content output range 0-12         Print ( . 4 , jedis.lrange (listName, 0 , 2 ));   // output range 0-2 content         Print ( . 5 , jedis.llen (listName));   // output length         Print ( . 6
        


      



, jedis.lpop (listName)); // pop foremost one content
         Print ( 10 , jedis.linsert (listName, BinaryClient.LIST_POSITION.AFTER, "A4" , "dd" )); 
        Print ( . 11 , jedis.lrange ( listName, 0 , . 11 ));

        String userKey = "userxx";
        jedis.hset(userKey,"name","jim");
        jedis.hset(userKey,"age","12");
        jedis.hset(userKey,"phone","1562225555");
        print(12,jedis.hget(userKey,"name")); //取出对应信息
        print(13,jedis.hgetAll(userKey));  //全部取出
        jedis.hdel(userKey,"phone");
        print(14,jedis.hgetAll(userKey));  15        Print (// remove all information
, jedis.hexists (UserKey, "In Email" )); // there In Email
         Print ( 16 , jedis.hexists (UserKey, "Age" )); // there Age
         Print ( . 17 , jedis.hkeys (UserKey)) ; // output Key
         Print ( 18 is , jedis.hvals (UserKey)); // output value
         jedis.hsetnx (UserKey, "school" , "ZJU" ); // add school property
         jedis.hsetnx (UserKey, "name" , "YXY" );    // if there is no rewriting
         Print ( . 19 , jedis.hgetAll (UserKey));

        //set
        String likeKey1="commentLike1";
        String likeKey2="commentLike2";
        for(int i=0;i<10 ; ++i){
            jedis.sadd(likeKey1,String.valueOf(i));
            jedis.sadd(likeKey2,String.valueOf(i*i));
        }
        print(20,jedis.smembers(likeKey1));
        print(21,jedis.smembers(likeKey2));
        print(22,jedis.sunion(likeKey1,likeKey2));//求并
        print(23,jedis.sdiff(likeKey1,likeKey2));//我有你无
        print(24 , jedis.sinter (likeKey1, likeKey2)); // find common
         Print ( 25 , jedis.sismember (likeKey1, "12 is" )); 
        Print ( 25 , jedis.sismember (likeKey2, "16" )); / / query object not there
         jedis.srem (likeKey1, "5" ); 
        Print ( 27  large columns   Spring Boot of Redis Detailed , jedis.smembers (likeKey1));

        User user = new User();
        user.setName("xx");
        user.setPassword("ppp");
        user.setHeadUrl("a.png");
        user.setSalt("salt");
        user.setId(1);
        print(46,JSONObject.toJSONString(user));
        jedis.set("user1",JSONObject.toJSONString(user));

        String value = jedis.get("user1");
        User user2=JSON.parseObject(value,User.class);
        print(47,user2);
        int k=2;
    }
    @Override
    public void afterPropertiesSet() throws Exception {
    }
}

Redis Affairs

redis transaction can execute multiple commands once, and have the following two properties:

A transaction is a separate isolated operation, all of the transaction commands are serialized, in the execution order, the execution of the transaction, the command will not be sent by the other client interrupt request

A transaction is an atomic operation, either all of the commands in the transaction is performed, or not performed

A transaction from start to execution has three phases:

Begin transaction

Command into the team

The enforcement branch

Example:

MULTI first to start a transaction, and then multiple commands into teams to the transaction, the transaction is triggered by the last EXEC command, together with all the commands in the transaction

127.0.0.1:6379> MULTI
OK
127.0.0.1:6379> set book-name "Java Thinking in"
QUEUED
127.0.0.1:6379> GET book-name
QUEUED
127.0.0.1:6379> SADD tag "JAVA" "Coding"
QUEUED
127.0.0.1:6379> SMEMBERS tag
QUEUED
127.0.0.1:6379> EXEC
1) OK
2) "Java Thinking in"
3) (integer) 2
4) 1) "JAVA"
   2) "Coding"

事务相关命令：

DISCARD：取消事务discard，放弃执行事务中所有命令

EXEC：执行所有事务块内的命令 exec

MULTI：标记一个事务块的开始multi

UNWATCH：取消watch命令对所有key的监视

Redis脚本

Redis脚本用Lua解释器来执行脚本，脚本执行的命令为EVAL

127.0.0.1:6379> EVAL "return {KEYS[1],KEYS[2],ARGV[1],ARGV[2]}" 2 key1 key2 first second
1) "key1"
2) "key2"
3) "first"
4) "second"

Redis 连接

Redis连接服务器

127.0.0.1:6379> AUTH "password"
(error) ERR Client sent AUTH, but no password is set //没有密码，所以...
127.0.0.1:6379> ping
PONG
127.0.0.1:6379>

连接命令：

AUTH password：验证密码是否正确

PONG：查看服务器是否运行

ECHO message ：打印字符串

QUIT：关闭当前连接

SELECT index ：切换到指定的数据库

Java使用Redis

添加jedis.jar 包

然后就可以嗨起来了

连接服务器

import redis.clients.jedis.Jedis;
public class RedisJava {
    public static void main(String [] args){
        //连接本地的Redis服务
        Jedis jedis =new Jedis("localhost");
        System.out.println("连接成功");
        //查看服务器是否运行
        System.out.println("服务正在运行："+jedis.ping());
    }
}

---
  连接成功
服务正在运行：PONG

字符串

import redis.clients.jedis.Jedis;
public class RedisJava {
    public static void main(String [] args){
        //连接本地的Redis服务
        Jedis jedis =new Jedis("localhost");
        System.out.println("连接成功");
        jedis.set("damin","zhoudm.com");
        System.out.println("redis 存储的字符串为："+jedis.get("damin"));
    }
}

---
连接成功
redis 存储的字符串为：zhoudm.com

Redis Java List

import redis.clients.jedis.Jedis;
import java.util.List;
public class RedisJava {
    public static void main(String [] args){
        //连接本地的Redis服务
        Jedis jedis =new Jedis("localhost");
        System.out.println("连接成功");
        jedis.lpush("zhoudm","zhoudm.com");
        jedis.lpush("zhoudm","baidu.com");
        jedis.lpush("zhoudm","360.com");
        jedis.lpush("zhoudm","google.com");

        List<String> list=jedis.lrange("zhoudm",0,3);
        for(int i=0;i<list.size();i++) {
            System.out.println("列表为：" + list.get(i));
        }
    }
}

---
连接成功
列表为：google.com
列表为：360.com
列表为：baidu.com
列表为：zhoudm.com

Redis Java Keys

import redis.clients.jedis.Jedis;
import java.util.Set;
import java.util.Iterator;

public class RedisJava {
    public static void main(String [] args){
        //连接本地的Redis服务
        Jedis jedis =new Jedis("localhost");
        System.out.println("连接成功");

        Set<String> keys=jedis.keys("*");
        Iterator<String> it=keys.iterator();
        while(it.hasNext()){
            String key = it.next();
            System.out.println(key);
        }
    }
}

---
 连接成功
zhoudm
spring:session:sessions:7ff2fe7e-9454-48a1-b44c-9b5f6b7b1507
book-name
spring:session:sessions:9a02f60c-fd16-49b5-9977-08446f4ffff5
spring:session:sessions:f1312270-95cf-4d19-a88d-5af26b03a61c
spring:session:sessions:expires:9a02f60c-fd16-49b5-9977-08446f4ffff5
spring:session:expirations:1504881480000
user:1
spring:session:sessions:f31624a8-b014-4768-826d-8b5b484b63a7
collector
spring:session:sessions:expires:f1312270-95cf-4d19-a88d-5af26b03a61c
spring:session:sessions:expires:f31624a8-b014-4768-826d-8b5b484b63a7
name
spring:session:expirations:1504409460000
damin
runoob
tag
spring:session:expirations:1505295120000
spring:session:expirations:1504252440000
spring:session:sessions:expires:7ff2fe7e-9454-48a1-b44c-9b5f6b7b1507

Spring Boot of Redis Detailed