09-Jedis

Jedis操作redis

创个空项目 记得jdk javac 要修改配置

09-Jedis

09-Jedis

1.导入依赖

 <dependency>
        <groupId>redis.clients</groupId>
        <artifactId>jedis</artifactId>
        <version>3.2.0</version>
    </dependency>
    <dependency>
        <groupId>com.alibaba</groupId>
        <artifactId>fastjson</artifactId>
        <version>1.2.61</version>
    </dependency>

2.编码测试:

  • 连接数据库
  • 操作命令
  • 断开连接
package com.tian;

import redis.clients.jedis.Jedis;

public class TestPing {
    public static void main(String[] args) {
        // 1. new Jedis对象
        Jedis jedis = new Jedis("127.0.0.1",6379);
        //jedis所有的命令就是我们之前学习的所有指令!
        System.out.println(jedis.ping());

    }
}

输出 : PONG

常用的API

String

 //jedis所有的命令就是我们之前学习的所有指令!
        System.out.println(jedis.ping());
        System.out.println("清空数据:"+jedis.flushDB());
        System.out.println("判断某个键是否存在: "+jedis.exists( "username"));
        System.out.println("新增<'username','kuangshen'>的键值对: "+jedis.set("username","kuangshen"));
        System.out.println("新增< 'password','password'>的键值对:"+jedis.set("password","password"));
        System.out.println("系统中所有的键如下:");
        Set<String> keys =jedis.keys("*");
        System.out.println(keys);

        System.out.println("删除键password: "+jedis.del("password"));
        System.out.println("判断键password是否存在:"+jedis.exists("password"));
        System.out.println("查看键username所存储的值的类型:"+jedis.type("username"));
        System.out.println("随机返回key空间的一个: "+jedis.randomKey());
        System.out.println("重命名key:"+jedis. rename("username","name"));
        System.out.println("取出改后的name: "+jedis.get("name"));
        System.out.println("按索引查询:"+jedis.select(0));
        System.out.println("删除当前选择数据库中的所有key: "+jedis.flushDB());
        System.out.println("返回当前数据库中key的数目: "+jedis.dbSize());
        System.out.println("删除所有数据库中的所有key: "+jedis.flushAll());

所有的api命令就是我们上面的学的命令,一个都没有变化

Jedis再次理解事务

package com.tian;

import com.alibaba.fastjson.JSONObject;
import redis.clients.jedis.Jedis;
import redis.clients.jedis.Transaction;

public class TestShiWu {
    public static void main(String[] args) {
        Jedis jedis = new Jedis("127.0.0.1",6379);
        jedis.flushDB();
        JSONObject jsonObject = new JSONObject();
        jsonObject.put("hello","world");
        jsonObject.put("name","kuangshen");
        //开启事务
        Transaction multi = jedis.multi();
        String result = jsonObject.toJSONString();
//        jedis.watch(result);
        try {
            multi.set("user1",result);
            multi.set("user2",result);
            int i=1/0;
            multi.exec();  //执行事务
        } catch (Exception e) {
            multi.discard();//如果失败放弃事务
            e.printStackTrace();
        }finally {
            System.out.println(jedis.get("user1"));
            System.out.println(jedis.get("user2"));
            jedis.close();
        }
        jedis.close();//关闭连接
    }
}

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