码迷,mamicode.com
首页 > 其他好文 > 详细

Redis的数据结构以及使用

时间:2019-03-13 18:24:13      阅读:197      评论:0      收藏:0      [点我收藏+]

标签:tran   close   hone   数据结构   obj   用户   setname   try   push   

reids命令可以参考中文官网:http://redis.cn/commands.html

关于reids的使用,可以封装到工具类进行调用:

Redis的工具类:JedisAdapter

技术图片View Code
除了数据结构:reids还可以用来保持事务的一致性;例如:

1:关于Redis的事务:利用reids的exec命令保证执行,不然就discard回滚
例如声明两个方法:
Transaction multi(Jedis jedis)
List<Object> exec(Transaction tx, Jedis jedis)
技术图片
    public Transaction multi(Jedis jedis) {
                try {
                    return jedis.multi();
                } catch (Exception e) {
                    logger.error("发生异常" + e.getMessage());
                } finally {
                }
                return null;
            }
        
            public List<Object> exec(Transaction tx, Jedis jedis) {
                try {
                    return tx.exec(); //保证事务执行
                } catch (Exception e) {
                    logger.error("发生异常" + e.getMessage());
                    tx.discard();   //回滚
                } finally {
                    if (tx != null) {
                        try {
                            tx.close();
                        } catch (IOException ioe) {
                            // ..
                        }
                    }
                    if (jedis != null) {
                        jedis.close();
                    }
                }
                return null;
            }
View Code

2:对于两个方法的使用:

 public boolean follow(int userId, int entityType, int entityId) {
        String followerKey = RedisKeyUtil.getFollowerKey(entityType, entityId);
        String followeeKey = RedisKeyUtil.getFolloweeKey(userId, entityType);
        Date date = new Date();
        // 实体的粉丝增加当前用户
        Jedis jedis = jedisAdapter.getJedis();
        Transaction tx = jedisAdapter.multi(jedis);
        tx.zadd(followerKey, date.getTime(), String.valueOf(userId));
        // 当前用户对这类实体关注+1
        tx.zadd(followeeKey, date.getTime(), String.valueOf(entityId));
        List<Object> ret = jedisAdapter.exec(tx, jedis);
        return ret.size() == 2 && (Long) ret.get(0) > 0 && (Long) ret.get(1) > 0;
    }
followee/follower两个队列
 

3:常见的redis数据结构和使用:

   List:双向列表,适用于最新列表,关注列表
lpush
lpop
blpop
lindex
lrange
lrem
linsert
lset
rpush
Set:适用于无顺序的集合,点赞点踩,抽奖,已读,共同好友

sdiff
smembers
sinter
scard
SortedSet:排行榜,优先队列

zadd
zscore
zrange
zcount
zrank
zrevrank
Hash:对象属性,不定长属性数

hset
hget
hgetAll
hexists
hkeys
hvals
KV:单一数值,验证码,PV,缓存
set
setex
incr
技术图片
Jedis jedis = new Jedis("redis://localhost:6379/9");
jedis.flushDB();

// get set
jedis.set("hello", "world");
print(1, jedis.get("hello"));
jedis.rename("hello", "newhello");
print(1, jedis.get("newhello"));
jedis.setex("hello2", 1800, "world");

//
jedis.set("pv", "100");
jedis.incr("pv");
jedis.incrBy("pv", 5);//一次加五
print(2, jedis.get("pv"));
jedis.decrBy("pv", 2);
print(2, jedis.get("pv"));

print(3, jedis.keys("*"));//打印出来所有的key


//
String listName = "list";
jedis.del(listName);
for (int i = 0; i < 10; ++i) {
    jedis.lpush(listName, "a" + String.valueOf(i));
}
print(4, jedis.lrange(listName, 0, 12));
print(4, jedis.lrange(listName, 0, 3));
print(5, jedis.llen(listName));//长度
print(6, jedis.lpop(listName));//先进后出,pop
print(7, jedis.llen(listName));//长度
print(8, jedis.lrange(listName, 2, 6));
print(9, jedis.lindex(listName, 3));
print(10, jedis.linsert(listName, BinaryClient.LIST_POSITION.AFTER, "a4", "xx"));//插入
print(10, jedis.linsert(listName, BinaryClient.LIST_POSITION.BEFORE, "a4", "bb"));//删除
print(11, jedis.lrange(listName, 0 ,12)) ;

// hash
String userKey = "userxx";
jedis.hset(userKey, "name", "jim");
jedis.hset(userKey, "age", "12");
jedis.hset(userKey, "phone", "18618181818");
print(12, jedis.hget(userKey, "name"));
print(13, jedis.hgetAll(userKey));
jedis.hdel(userKey, "phone");
print(14, jedis.hgetAll(userKey));
print(15, jedis.hexists(userKey, "email"));
print(16, jedis.hexists(userKey, "age"));
print(17, jedis.hkeys(userKey));
print(18, jedis.hvals(userKey));
jedis.hsetnx(userKey, "school", "zju");
jedis.hsetnx(userKey, "name", "yxy");
print(19, jedis.hgetAll(userKey));

// set集和
String likeKey1 = "commentLike1";
String likeKey2 = "commentLike2";
for (int i = 0; i < 10; ++i) {
    jedis.sadd(likeKey1, String.valueOf(i));
    jedis.sadd(likeKey2, String.valueOf(i*i));
}
print(20, jedis.smembers(likeKey1)); //smembers(key)取值
print(21, jedis.smembers(likeKey2));
print(22, jedis.sunion(likeKey1, likeKey2));//求并集
print(23, jedis.sdiff(likeKey1, likeKey2)); //补集
print(24, jedis.sinter(likeKey1, likeKey2));//交集
print(25, jedis.sismember(likeKey1, "12"));//判断是否存在
print(26, jedis.sismember(likeKey2, "16"));//判断
jedis.srem(likeKey1, "5");
print(27, jedis.smembers(likeKey1));
jedis.smove(likeKey2, likeKey1, "25"); //从一移进2一个25
print(28, jedis.smembers(likeKey1));
print(29, jedis.scard(likeKey1)); //求总和

String rankKey = "rankKey";//优先队列zset()
jedis.zadd(rankKey, 15, "jim");
jedis.zadd(rankKey, 60, "Ben");
jedis.zadd(rankKey, 90, "Lee");
jedis.zadd(rankKey, 75, "Lucy");
jedis.zadd(rankKey, 80, "Mei");
print(30, jedis.zcard(rankKey));// zcard()输出
print(31, jedis.zcount(rankKey, 61, 100));
print(32, jedis.zscore(rankKey, "Lucy"));
jedis.zincrby(rankKey, 2, "Lucy");
print(33, jedis.zscore(rankKey, "Lucy"));
jedis.zincrby(rankKey, 2, "Luc");
print(34, jedis.zscore(rankKey, "Luc"));
print(35, jedis.zrange(rankKey, 0, 100));
print(36, jedis.zrange(rankKey, 0, 10));//范围输出
print(36, jedis.zrange(rankKey, 1, 3));
print(36, jedis.zrevrange(rankKey, 1, 3));//从低到高排列
for (Tuple tuple : jedis.zrangeByScoreWithScores(rankKey, "60", "100")) {
    print(37, tuple.getElement() + ":" + String.valueOf(tuple.getScore()));
}

print(38, jedis.zrank(rankKey, "Ben"));
print(39, jedis.zrevrank(rankKey, "Ben"));

String setKey = "zset";
jedis.zadd(setKey, 1, "a");
jedis.zadd(setKey, 1, "b");
jedis.zadd(setKey, 1, "c");
jedis.zadd(setKey, 1, "d");
jedis.zadd(setKey, 1, "e");

print(40, jedis.zlexcount(setKey, "-", "+"));
print(41, jedis.zlexcount(setKey, "(b", "[d"));//不包含
print(42, jedis.zlexcount(setKey, "[b", "[d"));//包含,b到d
jedis.zrem(setKey, "b");
print(43, jedis.zrange(setKey, 0, 10));
jedis.zremrangeByLex(setKey, "(c", "+");
print(44, jedis.zrange(setKey, 0 ,2));

/*连接池
JedisPool pool = new JedisPool();
for (int i = 0; i < 100; ++i) {
    Jedis j = pool.getResource();
    print(45, j.get("pv"));
    j.close();
}*/

User user = new User();
user.setName("xx");
user.setPassword("ppp");
user.setHeadUrl("a.png");
user.setSalt("salt");
user.setId(1);
print(46, JSONObject.toJSONString(user));//序列化user
jedis.set("user1", JSONObject.toJSONString(user));

String value = jedis.get("user1");
User user2 = JSON.parseObject(value, User.class);//反序列化,转化为user对象;
print(47, user2);
int k = 2;
View Code

 

Redis的数据结构以及使用

标签:tran   close   hone   数据结构   obj   用户   setname   try   push   

原文地址:https://www.cnblogs.com/liguo-wang/p/10524798.html

(0)
(0)
   
举报
评论 一句话评论(0
登录后才能评论!
© 2014 mamicode.com 版权所有  联系我们:gaon5@hotmail.com
迷上了代码!