Redis非关系型数据库

淡淡的烟草味﹌ 2022-06-10 04:45 210阅读 0赞

下载地址:https://github.com/MicrosoftArchive/redis/releases  ![Center][]

下载后，解压,找到

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点击运行:

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在myeclipse中新建项目,导入jar包(jedis-2.1.0.jar,commons-pool-1.6.jar):

测试是否ping通:

package com.htxx.redis;
    
    import redis.clients.jedis.Jedis;
    
    public class Redis {
       private  Jedis jedis;//客户端连接
       public Redis() {
    	// TODO Auto-generated constructor stub
    	   //-------连接redis服务器  -----
    	   jedis=new Jedis("localhost", 6379);
    	   //-------查看服务是否运行,如果运行正常会返回PONG------
    	   System.out.println("服务运行状况:"+jedis.ping());
    	   //--------权限验证,输入密码admin--------
    	   //jedis.auth("admin");
    }
       
       public static void main(String[] args) {
    	Redis redis=new Redis();
    
    	
    }
    }

对String的操作:

public void testString(){
    	   //--------设置key-value--------
    	   jedis.set("name", "sasa");
    	   System.out.println(jedis.get("name"));//sasa
    	   jedis.append("name", " is very handsome");//在key为name 的值后面拼接" is very handsome"
    	   System.out.println(jedis.get("name"));//sasa is very handsome
    	   //--------设置多个键值对--------
    	   String[] str={"gender","man","age","25"};
    	   jedis.mset(str);
    	   String[] keys={"name","gender","age"};
    	   System.out.println(jedis.mget(keys));//[sasa is very handsome, man, 25]
    	   //------删除某个键值对----
    	   String[] key1={"age"};
    	   jedis.del(key1);
    	   //------判断某key是否存在-----------
    	   System.out.println(jedis.exists("age"));//false
    	   //------查看某个key的剩余生存时间,永久生存

返回值为-1

或者不存在的Key

返回值为-2

，------------- System.out.println(jedis.ttl("name"));//-1 //-----清空数据库------- System.out.println(jedis.flushDB());//OK //------判断某key是否存在------------------- System.out.println(jedis.exists("name"));//false

//设置某一键值对的有效期

expire a 10  //-------设置a的有效期为10秒--------
       }

对Map的操作:

public void testMap(){
    	   Map<String,String> map=new HashMap();
    	   map.put("name", "sasa");
    	   map.put("gender", "man");
    	   map.put("looks", "handsome");
    	   //-------同时将多个 field-value (域-值)对设置到哈希表 key 中------
    	   jedis.hmset("user", map);
    	   //-------返回哈希表 key 中，一个或多个给定域的值---------
    	   List<String> values=jedis.hmget("user", "name","gender");
    	   System.out.println(values);//[sasa, man]
    	   //-----------删除map中某一个键值对----------
    	   jedis.hdel("user", "looks");
    	   //-----------查看是否还存在looks的键值对-------
    	   System.out.println(jedis.hmget("user", "looks"));//[null]
    	   //----------查看名称为key的hash中元素个数------
    	   System.out.println(jedis.hlen("user"));//2
    	   //--------是否存在key为user的记录 返回true--------
    	   System.out.println(jedis.exists("user"));//true
    	   //---------是否存在key为name的记录 返回true--------
    	   System.out.println(jedis.exists("name"));//false
    	   //---------返回map对象中所有key-------------
    	   Set<String> keys=jedis.hkeys("user");
    	   System.out.println(keys);//[gender, name]
    	   //--------返回map对象中所有value------------
    	   List<String> vals=jedis.hvals("user");
    	   System.out.println(vals);//[man, sasa]
       }

对List操作:

public void testList(){
    	   //----------清空数据---------
    	   jedis.flushDB();
    	   //-------增加数据---------------
    	   jedis.lpush("name", "zhangsan");
    	   jedis.lpush("name", "lisi");
    	   jedis.lpush("name", "wangwu");
    	   jedis.lpush("name", "zhaoliu");
    	   //---------按范围取出数据,第一个是想取出值的key，第二个是起点，第三个是终点--------------
    	   List<String> list=jedis.lrange("name",0, jedis.llen("name"));
    	   System.out.println(list);//[zhaoliu, wangwu, lisi, zhangsan]
    	   list=jedis.lrange("name",0,-1);
    	   System.out.println(list);//[zhaoliu, wangwu, lisi, zhangsan]
    	   list=jedis.lrange("name",0, 1);
    	   System.out.println(list);//[zhaoliu, wangwu]
    	   //--------------在右侧添加某个值------------
    	   jedis.rpush("name","zhaoliu");
    	   System.out.println(jedis.lrange("name",0,-1));//[zhaoliu, wangwu, lisi, zhangsan, zhaoliu]
    	   //-------------移除某个key尾部值--------------------
    	   jedis.rpop("name");
    	   System.out.println(jedis.lrange("name",0,-1));//[zhaoliu, wangwu, lisi, zhangsan]
    	   //-------------删除key-----------
    	   jedis.del("name");
    	   System.out.println(jedis.exists("name"));//fasle
       }

对LIST操作，分左和右（头和尾）  
对Set操作:

public void testSet(){
    	   //jedis.flushDB();
    	   jedis.sadd("pet", "pig","dog","cat","mouse");
    	   //----------------查看pet集合中所有元素-----------
    	   System.out.println(jedis.smembers("pet"));//[mouse, cat, dog, pig]
    	   //----------------pet集合删除元素---------------
    	   jedis.srem("pet", "dog");
    	   System.out.println(jedis.smembers("pet"));//[mouse, cat, pig]
    	   //----------------判断某一元素是否在集合内------------
    	   System.out.println(jedis.sismember("pet", "dog"));//false
    	   //---------------集合内元素个数----------------------
    	   System.out.println(jedis.scard("pet"));//3
       }

对Key操作:

public void testKey(){
    	   //-------------判断某个key是否存在------------
    	   System.out.println(jedis.exists("name"));//false
    	   //-------------添加某个key-------------
    	   jedis.set("name", "sasa");
    	   jedis.set("gender", "man");
    	   //---------------再次测试某个key是否存在---------
    	   System.out.println(jedis.exists("name"));//true
    	   //----------------查看所有key----------------
    	   Set<String> set=jedis.keys("*");
    	   System.out.println(set);//[gender, name, pet]
    	   //---------------删除某个key,若key不存在，忽略该命令-----
    	   jedis.del("pet");
    	   System.out.println(jedis.keys("*"));//[gender, name]
    	   //设置过期时间
    	   jedis.expire("gender", 2);
    	   try{
    		   Thread.sleep(3000);
    	   }catch(Exception e){
    		   e.printStackTrace();
    	   }
    	   System.out.println(jedis.keys("*"));//[name]
       }

参考:

http://www.cnblogs.com/liuling/p/2014-4-19-04.html  
http://www.cnblogs.com/edisonfeng/p/3571870.html  
http://redisdoc.com/index.html    里面有关于redis命令详解

[Center]: /images/20220610/9e993373a7704bb886d9c0d9460c1acc.png
[Center 1]: /images/20220610/7604687b393c4095b1b859eb6b4ef98d.png
[Center 2]: /images/20220610/3cb2b8c58f6548f2a1d19806b8aba2a4.png