set 集合
set 集合里面的数据是不能重读的
- SADD key member [member …]
向 set 集合中添加元素
- SMEMBERS key
查看集合中的所有元素
- SISMEMBER key member
查看某一个数据是否在集合中
- SCARD key
查看集合数据的个数，也就是集合的长度
- SREM key member [member …]
移除集合中指定的元素
127.0.0.1:6379> sadd myset "hello" (integer) 1 127.0.0.1:6379> sadd myset "wolrd" "xiaomotong" (integer) 2 127.0.0.1:6379> SMEMBERS myset 1) "wolrd" 2) "xiaomotong" 3) "hello" 127.0.0.1:6379> SISMEMBER myset hello (integer) 1 127.0.0.1:6379> SCARD myset (integer) 3 127.0.0.1:6379> SREM myset wolrd (integer) 1 127.0.0.1:6379> SMEMBERS myset 1) "xiaomotong" 2) "hello"
- SRANDMEMBER key [count]
随机获取集合里面的数据，可以指定个数
127.0.0.1:6379> sadd myset "v1" "v2" "v3" "v4" (integer) 4 127.0.0.1:6379> SMEMBERS myset 1) "v4" 2) "xiaomotong" 3) "v1" 4) "v2" 5) "hello" 6) "v3" 127.0.0.1:6379> SRANDMEMBER myset "v2" 127.0.0.1:6379> SRANDMEMBER myset "xiaomotong" 127.0.0.1:6379> SRANDMEMBER myset 2 1) "v4" 2) "v1" 127.0.0.1:6379> 127.0.0.1:6379> SRANDMEMBER myset 2 1) "xiaomotong" 2) "v1"
- SPOP key [count]
随机删除集合中的任意元素
127.0.0.1:6379> SMEMBERS myset 1) "v4" 2) "xiaomotong" 3) "v1" 4) "v2" 5) "hello" 6) "v3" 127.0.0.1:6379> SPOP myset "v2" 127.0.0.1:6379> SMEMBERS myset 1) "v4" 2) "xiaomotong" 3) "v1" 4) "hello" 5) "v3" 127.0.0.1:6379> SPOP myset "v4" 127.0.0.1:6379> SMEMBERS myset 1) "xiaomotong" 2) "v1" 3) "hello" 4) "v3"
- SMOVE source destination member
从指定的集合中取出一个元素，放到另外一个集合中
127.0.0.1:6379> SMEMBERS myset 1) "xiaomotong" 2) "v1" 3) "hello" 4) "v3" 127.0.0.1:6379> SMEMBERS myset 1) "xiaomotong" 2) "v1" 3) "hello" 4) "v3" 127.0.0.1:6379> SMOVE myset newset v1 (integer) 1 127.0.0.1:6379> SMEMBERS newset 1) "v1" 127.0.0.1:6379> SMEMBERS myset 1) "xiaomotong" 2) "hello" 3) "v3"
- SUNION key [key …]
取并集，对两个集合取并集
- SINTER key [key …]
取交集，对两个集合取交集
127.0.0.1:6379> SMEMBERS myset 1) "xiaomotong" 2) "hello" 3) "v3" 127.0.0.1:6379> sadd newset v3 (integer) 1 127.0.0.1:6379> sadd newset v6 v9 (integer) 2 127.0.0.1:6379> SUNION myset newset 1) "v3" 2) "hello" 3) "xiaomotong" 4) "v1" 5) "v6" 6) "v9" 127.0.0.1:6379> SINTER myset newset 1) "v3" 127.0.0.1:6379>
set 应用场景可以有，多个用户的共同关注，好友推荐，共同的粉丝，功能的爱好等等
hash 哈希
Map 集合，key-map，此时 key-value 是一个集合，本质上和 string 类型没有啥区别，还是一个简单的 key-value 形式
- HSET key field value [field value …] / HMSET key field value [field value …]
在 hash key 中添加 1 个或者多个 key-value
- HGET key field
获取 hash 里面的一个 key 对应的 value
- HMGET key field [field …]
获取 hash 里面的多个 key 对应的 value
- HGETALL key
获取 hash 里面所有的 键值对
127.0.0.1:6379> hset myhash name xiaomotong age 12 hobby play (integer) 3 127.0.0.1:6379> hget myhash name "xiaomotong" 127.0.0.1:6379> hmget myhash name age 1) "xiaomotong" 2) "12" 127.0.0.1:6379> hgetall myhash 1) "name" 2) "xiaomotong" 3) "age" 4) "12" 5) "hobby" 6) "play"
- HDEL key field [field …]
删除 hash 里面的 key，一个或者多个
127.0.0.1:6379> HSET myhash k1 v1 k2 v2 k3 v3 (integer) 3 127.0.0.1:6379> hgetall (error) ERR wrong number of arguments for 'hgetall' command 127.0.0.1:6379> hgetall myhash 1) "age" 2) "12" 3) "hobby" 4) "play" 5) "k1" 6) "v1" 7) "k2" 8) "v2" 9) "k3" 10) "v3" 127.0.0.1:6379> HDEL myhash k1 k2 (integer) 2 127.0.0.1:6379> HDEL myhash name (integer) 1 127.0.0.1:6379> hgetall myhash 1) "age" 2) "12" 3) "hobby" 4) "play" 5) "k3" 6) "v3"
- HLEN key
获取 hash 的长度，也就是 key-value 的对数
127.0.0.1:6379> HLEN myhash (integer) 3
- HINCRBY key field increment
在集合中的某个 key 上增加值，若值是正数，则是加，若值是负数则是减
- HSETNX key field value
向 hash 中加入键值对，若不存在则添加，存在则添加失败
127.0.0.1:6379> hset myhash age 12 (integer) 1 127.0.0.1:6379> HINCRBY myhash age 2 (integer) 14 127.0.0.1:6379> HINCRBY myhash age -1 (integer) 13 127.0.0.1:6379> HSETNX myhash name xiaozhu (integer) 1 127.0.0.1:6379> HSETNX myhash name xiaopangzi (integer) 0 127.0.0.1:6379> hgetall myhash 1) "age" 2) "13" 3) "name" 4) "xiaopangzi"
hash 的应用场景有，经常变更数据的地方，尤其是一些用户的信息，经常变动的信息
hash 更适合对象的存储，string 更加适合字符串的存储
zset 有序集合
zset 也是集合，只是在 set 的基础上加上了一个值
- ZADD key [NX|XX] [GT|LT] [CH] [INCR] score member [score member …]
向有序集合中添加 分数 和 值，可以添加多个
- ZRANGEBYSCORE key min max [WITHSCORES] [LIMIT offset count]
按照分数的顺序排序，-inf 为负无穷，+inf 为正无穷
- ZRANGE key min max [BYSCORE|BYLEX] [REV] [LIMIT offset count] [WITHSCORES]
查看有序集合里面的所有的值
127.0.0.1:6379> ZADD myage 10 xiaoming 8 xiaohong 19 xiaozhu (integer) 3 127.0.0.1:6379> ZRANGEBYSCORE myage 0 -1 (empty array) 127.0.0.1:6379> ZRANGEBYSCORE myage -inf +inf 1) "xiaohong" 2) "xiaoming" 3) "xiaozhu" 127.0.0.1:6379> ZRANGEBYSCORE myage -inf +inf withscores 1) "xiaohong" 2) "8" 3) "xiaoming" 4) "10" 5) "xiaozhu" 6) "19" 127.0.0.1:6379> ZRANGEBYSCORE myage -inf 10 1) "xiaohong" 2) "xiaoming" 127.0.0.1:6379> ZRANGE myage 0 -1 1) "xiaohong" 2) "xiaoming" 3) "xiaozhu"
- ZREM key member [member …]
删除有序集合里面的数据
127.0.0.1:6379> ZREM myage xiaoming (integer) 1 127.0.0.1:6379> ZRANGEBYSCORE myage -inf +inf withscores 1) "xiaohong" 2) "8" 3) "xiaozhu" 4) "19"
- ZREVRANGE key start stop [WITHSCORES]
对有序集合从大到小排序
127.0.0.1:6379> ZADD myage 7 xiaohe 17 xiaoliu 14 huhu (integer) 3 127.0.0.1:6379> ZRANGE myage 0 -1 1) "xiaohe" 2) "xiaohong" 3) "huhu" 4) "xiaoliu" 5) "xiaozhu" 127.0.0.1:6379> ZRANGEBYSCORE myage -1 20 1) "xiaohe" 2) "xiaohong" 3) "huhu" 4) "xiaoliu" 5) "xiaozhu" 127.0.0.1:6379> ZRANGEBYSCORE myage -1 20 withscores 1) "xiaohe" 2) "7" 3) "xiaohong" 4) "8" 5) "huhu" 6) "14" 7) "xiaoliu" 8) "17" 9) "xiaozhu" 10) "19" 127.0.0.1:6379> ZREVRANGE myage 0 -1 1) "xiaozhu" 2) "xiaoliu" 3) "huhu" 4) "xiaohong" 5) "xiaohe"
其余的 api 我们可以到 redis 官网上去进行学习和实践，可以查看 redis 官方的中文文档，http://www.redis.cn/
zset 的应用场景有：
set 排序，存储班级成绩信息，工资信息等等，用于排序和筛选的
带有权重的数据或者消息，排行榜的实现等等
欢迎点赞，关注，收藏
朋友们，你的支持和鼓励，是我坚持分享，提高质量的动力
好了，本次就到这里
技术是开放的，我们的心态，更应是开放的。拥抱变化，向阳而生，努力向前行。
我是小魔童哪吒，欢迎点赞关注收藏，下次见~
