One of the first steps to redis

Set the background process

 

Get into redis.conf Medium 136 Change line to yes  Set the background process

1. modify bind  , Change to qianfeng01 
2. Change password   Find No 500 Row or so  requorepass  Change to 123456
3. Login code

see  ps -ef | grep redis

①redis-server /usr/local/redis/redis.conf

redis-cli -h qianfeng01 -p 6379 -a password

②redis-cli -h qianfeng01 -p 6379 -a 123456

Common codes entered :

Select   indexid    0-15  Switch Library

Flushdb    Clean up the current library

Flushall       Clean up all libraries

1. # Query relevant information according to matching pattern key

   keys *   # Query all key

   keys ?O*   # The second character of the query is O Of key

2. dbsize     # View all under the current library key The number of

3. exists key   # Judge a certain key Whether there is ,  0 Does not exist ,1 Indicates presence

4. type key    # see key The type of

5. del key   # Delete a key    1 Indicates that the deletion was successful   0 Indicates that deletion failed

6. unlink key # Delete a key( Non blocking delete )

 # Only will key from keyspace Delete from metadata , The real deletion will be deleted asynchronously in the follow-up    ( The meaning of playing first and then cutting )

7. expire key seconds     # Set up key Life time of

8. persist key    # eliminate key Life time of ,  There's no point in clearing that's expired

9. ttl key       # see key Life time of     -2 Indicates expiration   -1 Never expire

set The syntax format of the instruction ：set key value [EX seconds] [PX milliseconds] [NX|XX]

     EX: KV Life time of , The unit is seconds

     PX: KV Life time of , In milliseconds

     NX: K When there is no , Will be set successfully

     XX: K Preexisting time , Will be covered

get The syntax format of the instruction ：

 get key

append city shanghai   <==  stay key Corresponding to the original value Add character string

About operation

set num 1

decr num         <==  Decline 1   requirement value The type of is plastic

decrb num 5     <==  Decline 5   Specify the step size

incr num                <==  Self increasing +1

incrby num 2           <==  Specifies the self increasing step size

About strings

get city  "beijingshanghai"

getrange city 0 2      Before and after the bag Intercepting string

getsetcity shenyang    <==  Override value , And return the original value

      Set up multiple pairs

      mset username zhangsan age 23 gender f isMarry false    <==  Set up multiple pairs KV

      mget username age gender isMarry num     <== Get multiple Key Of value value

api Realization

package com.qf;

import redis.clients.jedis.Jedis;
import redis.clients.jedis.params.SetParams;

import java.util.ArrayList;
import java.util.List;


public class RedisDemo03_String {
    public static void main(String[] args) {
        setOfString();
        getOfString();
    }
    //set Test of command
    public static void setOfString(){
        Jedis jedis = new Jedis("qianfeng01",6379);
        jedis.auth("123456");
        jedis.set("classno","sz2103");
        SetParams setParams = new SetParams();  // Parameterless constructors
        setParams.ex(100);  // Survival time
        //setParams.px(5000);
        jedis.set("teahcer","cidy",setParams);
        jedis.setnx("teaher1","anjing");
        jedis.append("city","is good");   // Add to the existing
        jedis.incr("num");
        jedis.incrBy("num",3);
        jedis.mset("k1","100","k2","200");
        jedis.close();
    }
    //get Test of command
    public static void getOfString(){
        Jedis jedis = new Jedis("qianfeng01",6379);
        jedis.auth("123456");
        String classno = jedis.get("classno");   //get(key)
        System.out.println("classno:"+classno);
        String teacher = jedis.get("teacher");
        System.out.println("teahcer"+teacher);
        Long teacherTTL = jedis.ttl("teacher");  // Survival time
        System.out.println("teacherTTL:"+teacherTTL);
        String teaher1 = jedis.get("teacher1");
        System.out.println("teacher1:"+teaher1);
        String city = jedis.get("city");
        System.out.println("city"+city);
        String num = jedis.get("num");
        System.out.println(num);
        List<String> list = jedis.mget("k1", "k2");    // For many ky The traversal Print the value
        for (String s : list){
            System.out.println(s);
        }
        jedis.close();
    }
}

hashes type

# hset The syntax of the command ：

       hset key field value

       hmset key field value [field value ...]

# hget The syntax of the command ：

       hget key field

       hmget key field [field ...]

qianfeng01:6379> hset people username lucy          <== Set up people The value of the name field

(integer) 1

qianfeng01:6379> hmset people age 24 gender m isMarry true   <== Set up people The values of the other fields of the

OK

qianfeng01:6379> hget people username               <== obtain people The value of the name field

"lucy"

qianfeng01:6379> hmget people username age gender isMarry    <== obtain people The values of multiple fields of

1) "lucy"

2) "24"

3) "m"

4) "true"

qianfeng01:6379> hdel people username isMarry   <== Delete people Multiple fields for

(integer) 2

qianfeng01:6379> hgetall people    <== obtain people All fields and values of

1) "age"

2) "24"

3) "gender"

4) "m"

qianfeng01:6379> HEXISTS people gender   <== Judge gender Whether the field exists , 1 Indicates presence , 0 Does not exist

(integer) 1

qianfeng01:6379> HEXISTS people isMarry

(integer) 0

qianfeng01:6379> HINCRBY people age 4   <==  For integer types field Add Numbers

(integer) 28

qianfeng01:6379> hkeys people   <==  obtain hash All types of fields

1) "age"

2) "gender"

qianfeng01:6379> HLEN people    <==  obtain hash Type of fields The number of

(integer) 2

qianfeng01:6379> hsetnx people isMarry false   <==  Set the value of the field , If it doesn't exist , Just succeed , If there is , Just report a mistake

(integer) 1

qianfeng01:6379> hsetnx people isMarry true    <==  0 I'm not successful ,1 It means success

(integer) 0

qianfeng01:6379> hget people isMarry

"false"

qianfeng01:6379> HSTRLEN people isMarry        <==  Get the specified field Of value String length of

(integer) 5

qianfeng01:6379> hvals people              <==  obtain hash All types of value

1) "28"

2) "m"

3) "false"

Api

package com.qf; import redis.clients.jedis.Jedis; import java.util.HashMap; import java.util.Map; import java.util.Set; public class RedisDemo04 {     public static void main(String[] args) {         hsetOfHash();         hgetOfHash();     }     public static void hsetOfHash(){         Jedis jedis = new Jedis("qianfeng01",6379);         jedis.auth("123456");         Map<String,String> map = new HashMap<>();         map.put("product_id","1091");         map.put("product_name","thinkpadt760");         map.put("product_desc"," Good series ");         map.put("product_warehouse","901");         map.put("product_evaluation"," very nice ");         jedis.hmset("product_clothing_1001",map);         jedis.close();     }     public static void hgetOfHash(){         Jedis jedis = new Jedis("qianfeng01",6379);         jedis.auth("123456");         if(jedis.exists("product_clothing_1001")){             Map<String,String> map = jedis.hgetAll("product_clothing_1001");             Set<Map.Entry<String,String>> entries = map.entrySet();             for(Map.Entry<String,String> entry :entries ){                 System.out.println(entry.getKey()+"\t"+entry.getValue());             }         }         jedis.close();     } }