Redis的实现（java）

Posted 2022-06-02 karrya

日常操作

public static void main(String[] args)
    
        Jedis jedis = new Jedis("192.168.222.129", 6379);
        
        //1、开启事务
        Transaction transaction = jedis.multi();
        
        //2、执行
        transaction.set("k4", "v4");
        transaction.set("k5", "v5");
        
        //3、提交事务
        transaction.exec();
        
        //4、放弃事务
        //transaction.discard();
    

加锁事务

 public static void main(String[] args)
    
        TestTx testTx = new TestTx();
        boolean retValue = testTx.transMethod();
        System.out.println("main=====return value " + retValue);
    
    
    private boolean transMethod()
    
        // TODO Auto-generated method stub
        Jedis jedis = new Jedis("192.168.222.129", 6379);
        int balance; //可用余额
        int debt;//欠额
        int pay = 10;//实际话费金额
        
        jedis.watch("balance");
        balance = Integer.parseInt(jedis.get("balance"));
        if (balance < pay)
        
            jedis.unwatch();
            System.out.println("您的余额不足");
            return false;
        
        else
        
            System.out.println("============开会消费========");
            //1、开启事务
            Transaction transaction = jedis.multi();
            //2、执行
            transaction.decrBy("balance", pay);
            transaction.incrBy("debt", pay);
            //3、提交事务
            transaction.exec();
            balance = Integer.parseInt(jedis.get("balance"));
            debt = Integer.parseInt(jedis.get("debt"));
            
            System.out.println("余额： " + balance);
            System.err.println("花费： " + debt);
            return true;
        
    

结果

============开会消费========
余额： 90
main=====return value true
花费： 10