理解 Redis(7) - Set 值

Bertha 。 2022-01-05 04:47 166阅读 0赞

unordered collection of unique strings.  
set值是唯一的字符串的无序集合, 把握住两个特点:**唯一**,**无序**.  
![1603147-20190221105103362-230141955.jpg][]

清空所有的数据, 并清理显示界面:

127.0.0.1:6379> flushall OK 127.0.0.1:6379> clear

保存一条 set 数据, 键是 myset1, 值是 1, 2, 3, 4 四个数字:

127.0.0.1:6379> sadd myset1 1 2 3 4 (integer) 4

查看键myset1 的值:

127.0.0.1:6379> smembers myset1 1) "1" 2) "2" 3) "3" 4) "4"

在键myset1里增加一个已有的数字3, 返回0, 表示添加不成功, 因为 set值是要求唯一的:

127.0.0.1:6379> sadd myset1 3 (integer) 0 127.0.0.1:6379> smembers myset1 1) "1" 2) "2" 3) "3" 4) "4"

在键myset1里增加一个新数字5, 返回1, 表示添加成功:

127.0.0.1:6379> sadd myset1 5 (integer) 1 127.0.0.1:6379> smembers myset1 1) "1" 2) "2" 3) "3" 4) "4" 5) "5"

查看键myset1的值里一共有几天数据:

127.0.0.1:6379> scard myset1 (integer) 5

新增一条 set 数据myset2:

127.0.0.1:6379> sadd myset2 5 8 7 6 4 9 (integer) 6 127.0.0.1:6379> smembers myset2 1) "4" 2) "5" 3) "6" 4) "7" 5) "8" 6) "9"

查看两条 set 数据 myset1 和 myset2 值的区别, myset1 写在前面, 表示查出所有 myset1 里有, 而 myset2 里没有的值:

127.0.0.1:6379> smembers myset1 1) "1" 2) "2" 3) "3" 4) "4" 5) "5" 127.0.0.1:6379> sdiff myset1 myset2 1) "1" 2) "2" 3) "3"

查出 myset1 相对于 myset2 里值的差别, 并且保存成一个新 set --- myset3:

127.0.0.1:6379> sdiffstore myset3 myset1 myset2 (integer) 3 127.0.0.1:6379> smembers myset3 1) "1" 2) "2" 3) "3"

合并 myset1 和 myset2 里的所有值, 由于 set值唯一性的特点, 重复的部分只保留一个:

127.0.0.1:6379> sunion myset1 myset2 1) "1" 2) "2" 3) "3" 4) "4" 5) "5" 6) "6" 7) "7" 8) "8" 9) "9"

合并 myset1 和 myset2 里的所有值, 并且保存成一个新 set --- myset4:

127.0.0.1:6379> sunionstore myset4 myset1 myset2 (integer) 9 127.0.0.1:6379> smembers myset4 1) "1" 2) "2" 3) "3" 4) "4" 5) "5" 6) "6" 7) "7" 8) "8" 9) "9"

指定删除 set值里的某一个数

127.0.0.1:6379> srem myset4 8 (integer) 1 127.0.0.1:6379> smembers myset4 1) "1" 2) "2" 3) "3" 4) "4" 5) "5" 6) "6" 7) "7" 8) "9"

指定删除 set值里的某几个数

127.0.0.1:6379> srem myset4 6 7 9 (integer) 3 127.0.0.1:6379> smembers myset4 1) "1" 2) "2" 3) "3" 4) "4" 5) "5"

随机删除 set值里的某一个数

127.0.0.1:6379> spop myset4 1 1) "5" 127.0.0.1:6379> smembers myset4 1) "1" 2) "2" 3) "3" 4) "4"

随机删除 set值里的某几个数

127.0.0.1:6379> spop myset4 3 1) "2" 2) "4" 3) "1"

取两个 set值的并集:

127.0.0.1:6379> smembers myset1 1) "1" 2) "2" 3) "3" 4) "4" 5) "5" 127.0.0.1:6379> smembers myset2 1) "4" 2) "5" 3) "6" 4) "7" 5) "8" 6) "9" 127.0.0.1:6379> sinter myset1 myset2 1) "4" 2) "5"

取两个 set值的并集, 并保存:

127.0.0.1:6379> sinterstore myset5 myset1 myset2 (integer) 2 127.0.0.1:6379> smembers myset5 1) "4" 2) "5"

把 myset1 的值里的数字 1 挪到 myset2

127.0.0.1:6379> smove myset1 myset2 1 (integer) 1 127.0.0.1:6379> smembers myset2 1) "1" 2) "4" 3) "5" 4) "6" 5) "7" 6) "8" 7) "9" 127.0.0.1:6379> smembers myset1 1) "2" 2) "3" 3) "4" 4) "5"

以上, 就是关于 set值的一些常用命令, enjoy......

转载于:https://www.cnblogs.com/rachelross/p/10411010.html

[1603147-20190221105103362-230141955.jpg]: /images/20211230/f1b141c7c3b94ae4a422b22c59cae18e.png