Redis的String操作

最新推荐文章于 2024-07-12 18:07:05 发布

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最新推荐文章于 2024-07-12 18:07:05 发布

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分类专栏： Redis

本文链接：https://blog.youkuaiyun.com/wxloveyun/article/details/46893231

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private  void  StringOperate(){
    System.out.println("======================String_1==========================");
    // 清空数据
    System.out.println("清空库中所有数据："+jedis.flushDB());
    System.out.println("=============增=============");
    jedis.set("key001","value001");
    jedis.set("key002","value002");
    jedis.set("key003","value003");
    System.out.println(jedis.get("key001"));
    System.out.println(jedis.get("key002"));
    System.out.println(jedis.get("key003"));
    System.out.println("=============删=============");
    System.out.println("删除key003键值对："+jedis.del("key003"));
    System.out.println("获取key003键对应的值："+jedis.get("key003"));
    System.out.println("=============改=============");
    //1、直接覆盖原来的数据
    System.out.println("直接覆盖key001原来的数据："+jedis.set("key001","value001-update"));
    System.out.println("获取key001对应的新值："+jedis.get("key001"));
    //2、直接覆盖原来的数据
    System.out.println("在key002原来值后面追加："+jedis.append("key002","+appendString"));
    System.out.println("获取key002对应的新值"+jedis.get("key002"));

    System.out.println("=============增，删，查（多个）=============");

    System.out.println("一次性新增key201,key202,key203,key204及其对应值："+jedis.mset("key201","value201",
            "key202","value202","key203","value203","key204","value204"));
    System.out.println("一次性获取key201,key202,key203,key204各自对应的值："+
            jedis.mget("key201","key202","key203","key204"));
    System.out.println("一次性删除key201,key202："+jedis.del(new String[]{"key201", "key202"}));
    System.out.println("一次性获取key201,key202,key203,key204各自对应的值："+
            jedis.mget("key201","key202","key203","key204"));
    System.out.println();


    //jedis具备的功能shardedJedis中也可直接使用，下面测试一些前面没用过的方法
    System.out.println("======================String_2==========================");
    // 清空数据
    System.out.println("清空库中所有数据："+jedis.flushDB());

    System.out.println("=============新增键值对时防止覆盖原先值=============");
    System.out.println("原先key301不存在时，新增key301："+shardedJedis.setnx("key301", "value301"));
    System.out.println("原先key302不存在时，新增key302："+shardedJedis.setnx("key302", "value302"));
    System.out.println("当key302存在时，尝试新增key302："+shardedJedis.setnx("key302", "value302_new"));
    System.out.println("获取key301对应的值："+shardedJedis.get("key301"));
    System.out.println("获取key302对应的值："+shardedJedis.get("key302"));

    System.out.println("=============超过有效期键值对被删除=============");
    // 设置key的有效期，并存储数据
    System.out.println("新增key303，并指定过期时间为2秒"+shardedJedis.setex("key303", 2, "key303-2second"));
    System.out.println("获取key303对应的值："+shardedJedis.get("key303"));
    try{
        Thread.sleep(3000);
    }
    catch (InterruptedException e){
    }
    System.out.println("3秒之后，获取key303对应的值："+shardedJedis.get("key303"));

    System.out.println("=============获取原值，更新为新值一步完成=============");
    System.out.println("key302原值："+shardedJedis.getSet("key302", "value302-after-getset"));
    System.out.println("key302新值："+shardedJedis.get("key302"));

    System.out.println("=============获取子串=============");
    System.out.println("获取key302对应值中的子串："+shardedJedis.getrange("key302", 5, 7));
}