Redis笔记07：五大数据类型-Set

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博客介绍了Set集合，强调其值不能重复的特性，还列举了srem、SRANDMEMBER、spop、smove等基础操作，以及差集、交集、并集等集合运算。

Set

Set中的值不能重复

基础

127.0.0.1:6379> sadd set1 hello    #set集合添加元素
(integer) 1
127.0.0.1:6379> sadd set1 world
(integer) 1
127.0.0.1:6379> sadd set1 666
(integer) 1
127.0.0.1:6379> smembers set1	#查看指定set的所有值
1) "hello"
2) "666"
3) "world"
127.0.0.1:6379> sismember set1 666	#判断某个值在不在set集合中
(integer) 1
127.0.0.1:6379> sismember set1 nihao
(integer) 0
127.0.0.1:6379> scard set1   #获取set集合中的元素个数
(integer) 3

srem

127.0.0.1:6379> smembers set1
1) "hello"
2) "666"
3) "world"
127.0.0.1:6379> srem set1 hello	#删除指定元素
(integer) 1
127.0.0.1:6379> smembers set1
1) "666"
2) "world"

SRANDMEMBER

127.0.0.1:6379> SRANDMEMBER set1   #随机获取一条数据
"world"
127.0.0.1:6379> SRANDMEMBER set1
"666"
127.0.0.1:6379> SRANDMEMBER set1
"world"

spop

127.0.0.1:6379> SMEMBERS set1
1) "666"
2) "world"
127.0.0.1:6379> spop set1  #随机删除一条数据
"666"
127.0.0.1:6379> SMEMBERS set1
1) "world"

smove

127.0.0.1:6379> SMEMBERS myset
1) "zhaoliu"
2) "lisi"
3) "zhangsan"
4) "wangwu"
127.0.0.1:6379> smove myset newset lisi  #把myset集合中的lisi移动到newset集合中（没有创建）
(integer) 1
127.0.0.1:6379> SMEMBERS myset
1) "zhaoliu"
2) "zhangsan"
3) "wangwu"
127.0.0.1:6379> SMEMBERS newset
1) "lisi"

差集、交集、并集

127.0.0.1:6379> SMEMBERS set1
1) "1"
2) "2"
3) "3"
127.0.0.1:6379> SMEMBERS set2
1) "3"
2) "4"
3) "5"
127.0.0.1:6379> SDIFF set1 set2		#差集
1) "1"
2) "2"
127.0.0.1:6379> SINTER set1 set2	 	#交集
1) "3"
127.0.0.1:6379> SUNION set1 set2	#并集
1) "1"
2) "2"
3) "3"
4) "4"
5) "5"