关于redis:免费领取红包封面Redis-系列redis-学习四set-集合hash-哈希zset-有序集合初步认知

文末收费支付红包封面哦，总共 2000 个，先到先得

set 汇合

set 汇合外面的数据是不能重读的

SADD key member [member ...]

向 set 汇合中增加元素

SMEMBERS key

查看汇合中的所有元素

SISMEMBER key member

查看某一个数据是否在汇合中

SCARD key

查看汇合数据的个数，也就是汇合的长度

SREM key member [member ...]

移除汇合中指定的元素

127.0.0.1:6379> sadd myset "hello"(integer) 1127.0.0.1:6379> sadd myset "wolrd" "xiaomotong"(integer) 2127.0.0.1:6379> SMEMBERS myset1) "wolrd"2) "xiaomotong"3) "hello"127.0.0.1:6379> SISMEMBER myset hello(integer) 1127.0.0.1:6379> SCARD myset(integer) 3127.0.0.1:6379> SREM myset wolrd(integer) 1127.0.0.1:6379> SMEMBERS myset1) "xiaomotong"2) "hello"

SRANDMEMBER key [count]

随机获取汇合外面的数据，能够指定个数

127.0.0.1:6379> sadd myset "v1" "v2" "v3" "v4"(integer) 4127.0.0.1:6379> SMEMBERS myset1) "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 21) "v4"2) "v1"127.0.0.1:6379>127.0.0.1:6379> SRANDMEMBER myset 21) "xiaomotong"2) "v1"

SPOP key [count]

随机删除汇合中的任意元素

127.0.0.1:6379> SMEMBERS myset1) "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 myset1) "v4"2) "xiaomotong"3) "v1"4) "hello"5) "v3"127.0.0.1:6379> SPOP myset"v4"127.0.0.1:6379> SMEMBERS myset1) "xiaomotong"2) "v1"3) "hello"4) "v3"

SMOVE source destination member

从指定的汇合中取出一个元素，放到另外一个汇合中

127.0.0.1:6379> SMEMBERS myset1) "xiaomotong"2) "v1"3) "hello"4) "v3"127.0.0.1:6379> SMEMBERS myset1) "xiaomotong"2) "v1"3) "hello"4) "v3"127.0.0.1:6379> SMOVE myset newset v1(integer) 1127.0.0.1:6379> SMEMBERS newset1) "v1"127.0.0.1:6379> SMEMBERS myset1) "xiaomotong"2) "hello"3) "v3"

SUNION key [key ...]

取并集，对两个汇合取并集

SINTER key [key ...]

取交加，对两个汇合取交加

127.0.0.1:6379> SMEMBERS myset1) "xiaomotong"2) "hello"3) "v3"127.0.0.1:6379> sadd newset v3(integer) 1127.0.0.1:6379> sadd newset v6 v9(integer) 2127.0.0.1:6379> SUNION myset newset1) "v3"2) "hello"3) "xiaomotong"4) "v1"5) "v6"6) "v9"127.0.0.1:6379> SINTER myset newset1) "v3"127.0.0.1:6379>

set 利用场景能够有，多个用户的独特关注，好友举荐，独特的粉丝，性能的喜好等等

hash 哈希

Map 汇合，key-map，此时 key-value 是一个汇合，实质上和 string 类型没有啥区别，还是一个简略的 key-value 模式

HSET key field value [field value ...] / HMSET key field value [field value ...]

在 hash key 中增加 1 个或者多个 key-value

HGET key field

获取 hash 外面的一个 key 对应的 value

HMGET key field [field ...]

获取 hash 外面的多个 key 对应的 value

HGETALL key

获取 hash 外面所有的键值对

127.0.0.1:6379> hset myhash name xiaomotong age 12 hobby play(integer) 3127.0.0.1:6379> hget myhash name"xiaomotong"127.0.0.1:6379> hmget myhash name age1) "xiaomotong"2) "12"127.0.0.1:6379> hgetall myhash1) "name"2) "xiaomotong"3) "age"4) "12"5) "hobby"6) "play"

HDEL key field [field ...]

删除 hash 外面的 key，一个或者多个

127.0.0.1:6379> HSET myhash k1 v1 k2 v2 k3 v3(integer) 3127.0.0.1:6379> hgetall(error) ERR wrong number of arguments for 'hgetall' command127.0.0.1:6379> 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) 2127.0.0.1:6379> HDEL myhash name(integer) 1127.0.0.1:6379> hgetall myhash1) "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

在汇合中的某个 key 上增加值，若值是负数，则是加，若值是正数则是减

HSETNX key field value

向 hash 中退出键值对，若不存在则增加，存在则增加失败

127.0.0.1:6379> hset myhash age 12(integer) 1127.0.0.1:6379> HINCRBY myhash age 2(integer) 14127.0.0.1:6379> HINCRBY myhash age -1(integer) 13127.0.0.1:6379> HSETNX myhash name xiaozhu(integer) 1127.0.0.1:6379> HSETNX myhash name xiaopangzi(integer) 0127.0.0.1:6379> hgetall myhash1) "age"2) "13"3) "name"4) "xiaopangzi"

hash 的利用场景有，常常变更数据的中央，尤其是一些用户的信息，常常变动的信息

hash 更适宜对象的存储，string 更加适宜字符串的存储

zset 有序汇合

zset 也是汇合，只是在 set 的根底上加上了一个值

ZADD key [NX|XX] [GT|LT] [CH] [INCR] score member [score member ...]

向有序汇合中增加分数和值，能够增加多个

ZRANGEBYSCORE key min max [WITHSCORES] [LIMIT offset count]

依照分数的程序排序，-inf 为负无穷，+inf 为正无穷

ZRANGE key min max [BYSCORE|BYLEX] [REV] [LIMIT offset count] [WITHSCORES]

查看有序汇合外面的所有的值

127.0.0.1:6379> ZADD myage 10 xiaoming 8 xiaohong 19 xiaozhu(integer) 3127.0.0.1:6379> ZRANGEBYSCORE myage 0 -1(empty array)127.0.0.1:6379> ZRANGEBYSCORE myage -inf +inf1) "xiaohong"2) "xiaoming"3) "xiaozhu"127.0.0.1:6379> ZRANGEBYSCORE myage -inf +inf withscores1) "xiaohong"2) "8"3) "xiaoming"4) "10"5) "xiaozhu"6) "19"127.0.0.1:6379> ZRANGEBYSCORE myage -inf 101) "xiaohong"2) "xiaoming"127.0.0.1:6379> ZRANGE myage 0 -11) "xiaohong"2) "xiaoming"3) "xiaozhu"

ZREM key member [member ...]

删除有序汇合外面的数据

127.0.0.1:6379> ZREM myage xiaoming(integer) 1127.0.0.1:6379> ZRANGEBYSCORE myage -inf +inf withscores1) "xiaohong"2) "8"3) "xiaozhu"4) "19"

ZREVRANGE key start stop [WITHSCORES]

对有序汇合从大到小排序

127.0.0.1:6379> ZADD myage 7 xiaohe 17 xiaoliu 14 huhu(integer) 3127.0.0.1:6379> ZRANGE myage 0 -11) "xiaohe"2) "xiaohong"3) "huhu"4) "xiaoliu"5) "xiaozhu"127.0.0.1:6379> ZRANGEBYSCORE myage -1 201) "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 -11) "xiaozhu"2) "xiaoliu"3) "huhu"4) "xiaohong"5) "xiaohe"

其余的 api 咱们能够到 redis 官网上去进行学习和实际，能够查看 redis 官网的中文文档，http://www.redis.cn/

zset 的利用场景有：

set 排序，存储班级问题信息，工资信息等等，用于排序和筛选的

带有权重的数据或者音讯，排行榜的实现等等

收费支付红包封面哦，总共 2000 个，先到先得

欢送点赞，关注，珍藏

敌人们，你的反对和激励，是我保持分享，提高质量的能源

好了，本次就到这里

技术是凋谢的，咱们的心态，更应是凋谢的。拥抱变动，背阴而生，致力向前行。

我是小魔童哪吒，欢送点赞关注珍藏，下次见~