"NOSQL" Redis Practice-Simple Demo implementation (i)

Redis is a key-value storage system.

The emergence of Redis, to a great extent, compensates for the memcached of such key/value storage, which can be a very good complement to relational databases in some cases.

Redis is a key-value storage system. Similar to the memcached. It supports storage of value types relative to many other, including string (string), list (linked list), set (set), Zset (sortedset--ordered collection), and hash (hash type). These data types support Push/pop, Add/remove, and intersection-set and difference sets, and richer operations, and these operations are atomic in nature. On this basis. Redis supports sorting in a variety of different ways.

As with memcached, to ensure efficiency. The data is cached in memory. The difference is that Redis periodically writes the updated data to the disk or writes the change operation to the appended record file. The Master-slave (master-slave replication) is implemented on this basis.

Memcache and Redis differences

Memcache less data types are available. There are only key-value pairs, andRedis provides a relatively large number of data types

Memcache The shutdown is gone, all data is stored in the memory, but no recovery is provided. Redis is able to store data on disk

Redis provides master-slave replication, Memcache No

Memcache is multi-threaded (with protocol resolution), Redis is a single thread

  

installation of Redis under Windows is used

1, installing Redis

Official download: Http://redis.io/download can download different version numbers according to the need

Windows Edition: Https://github.com/mythz/redis-windows

After downloading, you can right-click on a hard disk to extract the analogy E:\redis64-2.6.

2, start Redis

Turn on the service after entering the Redis folder (note plus redis.conf)

Redis-server.exe redis.conf

The Redis service shuts itself down when the form is to be turned off

Note : Redis will proactively save the data to the hard drive so let's assume it's a second time to open with a DB loaded from disk

3, test use

Also open a command line form into the Redis folder (notice to change your own IP)

redis-cli.exe-h 192.168. - . 215 - P 6379

4, using Java to operate Redis

Import Org.junit.After;  Import Org.junit.Before;  Import Org.junit.Test;  Import Redis.clients.jedis.Jedis;  Import Redis.clients.jedis.JedisPool;    Import Redis.clients.jedis.JedisPoolConfig;  Import Javax.sound.midi.Soundbank;      Import java.util.*;      public class Redistest {Jedispool pool;      Jedis Jedis;            @Before public void SetUp () {pool = new Jedispool (new Jedispoolconfig (), "192.168.24.215");         Jedis = Pool.getresource ();  /* Jedis.auth ("password"); * */** * Redis Storage 0 Base String * CRUD */@Test public void testbasicstring () {//--- --Add the data----------jedis.set ("name", "Hejingyuan");//Put Value-->hejingyuan System.out.pri into Key-->name Ntln (Jedis.get ("name"));//Run Result: Hejingyuan//-----Change data-----------//1, change jedis.append on original basis ("N   Ame "," Xvshu "); Very intuitive, similar map will Xvshu append to the already existing value System.out.println (Jedis.get ("name"));//Run Result: Hejingyuanxvshu            2, directly overwrite the original data jedis.set ("name", "He Jinghuan");          System.out.println (Jedis.get ("name"));//Run Result: He Jinghuan//delete key corresponding record Jedis.del ("name"); System.out.println (Jedis.get ("name"));//Run Result: null/** * mset equivalent to * jedis.set ("name", "Hejingyua          n ");          * Jedis.set ("Xvshu", "He Jinghuan");          */Jedis.mset ("name", "Hejingyuan", "Xvshu", "He Jinghuan");        System.out.println (Jedis.mget ("name", "Xvshu")); } }

Output Result:

Hejingyuan

Hejingyuanxvshu

He Jinghuan

Null

[Hejingyuan, He Jinghuan]

Concluding remarks:

During the operation,R Edis is saved to the hard disk by default (snapshotting), and Redis stores the snapshot files in the current folder (config Getdir to view) by default Dump.rdb file, you can specify the storage path and file name of the snapshot file by configuring Dir and dbfilename two parameters respectively.

before we operate Redis process, it is also constantly stored to the hard disk

Java Operation Redis the various tests: http://flychao88.iteye.com/blog/1527163

"NOSQL" Redis Practice-Simple Demo implementation (i)