这些疑问我一个个的去解释。第一部分。让数据能存放的时间，更加持久。那么利用的是。Redis缓存的一个文件。redis.windows.conf
思考一个问题为什么要学Redis持久性？写看一个案例。上面的图是Redis的服务器启动页面。 上面是一种数据类型。的存放和拿出数据的方式。 思考一个问题，当我关闭了服务器，数据还在吗？ 答案是不在。如果你用自己一天的数据存放的数据用上万个，突然断电。一切清零，你的心情如何？
为了解决上面的问题。所以有了我们接下来要学的，RDB,AOF. 什么是RDB？ 什么是AOF？ 总之：这两个名称，是来解决。上面的问题的？一个优秀的开发者，都在不断的思考这各自中问题。
接下来进入RDB与AOF学习。首先打开E:Redis-x64-3.2.100，文件下的redis.windows.conf文件。
# # Save the DB on disk: # # save上面是RDB文件的学习过程。 接下来我用AOF来操作一遍。# # Will save the DB if both the given number of seconds and the given # number of write operations against the DB occurred. # # In the example below the behaviour will be to save: # after 900 sec (15 min) if at least 1 key changed # after 300 sec (5 min) if at least 10 keys changed # after 60 sec if at least 10000 keys changed # # Note: you can disable saving completely by commenting out all "save" lines. # # It is also possible to remove all the previously configured save # points by adding a save directive with a single empty string argument # like in the following example: # # save "" save 900 1 save 300 10 save 10000 6
# The name of the append only file (default: "appendonly.aof") appendfilename "appendonly.aof" # The fsync() call tells the Operating System to actually write data on disk # instead of waiting for more data in the output buffer. Some OS will really flush # data on disk, some other OS will just try to do it ASAP. # # Redis supports three different modes: # # no: don't fsync, just let the OS flush the data when it wants. Faster. # always: fsync after every write to the append only log. Slow, Safest. # everysec: fsync only one time every second. Compromise. # # The default is "everysec", as that's usually the right compromise between # speed and data safety. It's up to you to understand if you can relax this to # "no" that will let the operating system flush the output buffer when # it wants, for better performances (but if you can live with the idea of # some data loss consider the default persistence mode that's snapshotting), # or on the contrary, use "always" that's very slow but a bit safer than # everysec. # # More details please check the following article: # http://antirez.com/post/redis-persistence-demystified.html # # If unsure, use "everysec". # appendfsync always appendfsync everysec # appendfsync no上面是AOF的详细信息。 主要是让你学会操作。 首先打开redis服务器，将你修改的文件信息，进行运行。 win+r 输入cmd 按下 enter 看操作。
Microsoft Windows [版本 10.0.19044.1348]
(c) Microsoft Corporation。保留所有权利。
C:UsersMZFAITHDREAM> E:
E:>cd E:Redis-x64-3.2.100
E:Redis-x64-3.2.100> redis-server.exe redis.windows.conf
[13268] 17 Dec 14:34:38.295 # Creating Server TCP listening socket 127.0.0.1:6379: bind: No error
E:Redis-x64-3.2.100>redis-server.exe redis.windows.conf
_._
_.-``__ ''-._
_.-`` `. `_. ''-._ Redis 3.2.100 (00000000/0) 64 bit
.-`` .-```. ```/ _.,_ ''-._
( ' , .-` | `, ) Running in standalone mode
|`-._`-...-` __...-.``-._|'` _.-'| Port: 6379
| `-._ `._ / _.-' | PID: 14768
`-._ `-._ `-./ _.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' | http://redis.io
`-._ `-._`-.__.-'_.-' _.-'
|`-._`-._ `-.__.-' _.-'_.-'|
| `-._`-._ _.-'_.-' |
`-._ `-._`-.__.-'_.-' _.-'
`-._ `-.__.-' _.-'
`-._ _.-'
`-.__.-'
[14768] 17 Dec 14:34:54.574 # Server started, Redis version 3.2.100
[14768] 17 Dec 14:34:54.575 * The server is now ready to accept connections on port 6379
观察上面的代码请看出你的问题。
进入用java语言获得redis中的数据。
导入架包
package com.redis.test;
import java.util.List;
import java.util.Map;
import java.util.Set;
import org.apache.tomcat.jni.OS;
import org.junit.Test;
import redis.clients.jedis.Jedis;
public class RedisTest {
@Test
public void test1() {
Jedis jedis =new Jedis("localhost",6379);
System.out.println("从redis数据库中获取名称"+jedis.get("name"));
System.out.println("从redis数据库中获取名称"+jedis.get("sex"));
System.out.println("从redis数据库中获取名称"+jedis.get("number"));
jedis.set("phone", "1234556");
System.out.println("增加成功1");
long q =jedis.del("name");
if(q>0) {
System.out.println("删除成功");
}
jedis.close();
}
@Test
public void test2() {
Jedis jedis =new Jedis("localhost",6379);
String name=jedis.hget("student", "name");
String age=jedis.hget("student", "age");
String sex=jedis.hget("student", "sex");
System.out.println(name+age+sex);
long l= jedis.hset("student", "adress", "江西省");
if(l>0) {
System.out.println("删除成功");
}
//增加数据
String adress=jedis.hget("student", "江西省");
System.out.println(adress);
jedis.hdel("student", "name");
//查询数据
Map map= jedis.hgetAll("student");
map.forEach((key,value)->System.out.println(key+"="+value));
jedis.close();
}
//list的集合
@Test
public void test3() {
//操作list的集合
Jedis jedis =new Jedis("localhost",6379);
//从left增加数据
jedis.lpush("mylist", "张三","李四","万物","hellow");
jedis.rpush("Amylist", "B张三","C李四","D万物","Ehellow");
List olList =jedis.lrange("myslist", 0, -1);
olList.forEach(s->System.out.println(s));
String s=jedis.lpop("mylist");
System.out.println("删除一条数据"+s);
String s1=jedis.rpop("mylist");
System.out.println("删除一条数据"+s1);
jedis.close();
}
//Set集合
@Test
public void test4() {
Jedis jedis =new Jedis("localhost",6379);
long l= jedis.sadd("myset","256","3373","373");
if(l>0) {
System.out.println("增加成功");
}else {
System.out.println("元素不能重复");
}
Set oSet =jedis.smembers("myset");
oSet.forEach(x->System.out.println(x));
jedis.close();
}
@Test
public void test5() {
Jedis jedis =new Jedis("localhost",6379);
jedis.zadd("mysort", 34,"王五");
jedis.zadd("mysort", 56, "小康");
jedis.zadd("mysort", 14,"四小五");
jedis.zadd("mysort", 66, "小二康");
Set oSet =jedis.zrange("mysort", 0,-1);
oSet.forEach(s->System.out.println(s));
jedis.close();
jedis.zrem("mysort", "小二康");
}
}
运行结果
Redis第一课https://blog.csdn.net/qq_56248592/article/details/121939650
