Redis的Set数据类型及常用命令
set中的值无序不能重复!!!
SADD 添加元素
SMEMBERS 查询元素
127.0.0.1:6379> SADD set one two three
(integer) 3
127.0.0.1:6379> SMEMBERS set
1) "three"
2) "two"
3) "one"
SISMEMBER 查看是否存在这个元素
127.0.0.1:6379> SMEMBERS set
1) "three"
2) "two"
3) "one"
127.0.0.1:6379> SISMEMBER set one
(integer) 1
127.0.0.1:6379> SISMEMBER set four
(integer) 0
SCARD 获取元素的个数
127.0.0.1:6379> SCARD set
(integer) 3
SMEMBERS移除指定元素,可以移除多个,用空格分隔
127.0.0.1:6379> SREM set two
(integer) 1
127.0.0.1:6379> SMEMBERS set
1) "three"
2) "one"
SRANDMEMBER随机抽选出指定个数的个数
127.0.0.1:6379> SMEMBERS set
1) "three"
2) "two"
3) "one"
4) "four"
5) "five"
127.0.0.1:6379> SRANDMEMBER set 2
1) "one"
2) "four"
SREM删除指定的一个或多个元素
127.0.0.1:6379> SREM set1 ok
(integer) 1
127.0.0.1:6379> SMEMBERS set1
1) "two"
127.0.0.1:6379> FLUSHALL
OK
127.0.0.1:6379> sadd set one two three four
(integer) 4
127.0.0.1:6379> SREM set two three
(integer) 2
127.0.0.1:6379> SMEMBERS set
1) "one"
2) "four"
随机删除一个或指定个数的元素
127.0.0.1:6379> SMEMBERS set
1) "three"
2) "two"
3) "one"
4) "four"
5) "five"
127.0.0.1:6379> SPOP set
"three"
127.0.0.1:6379> SPOP set 2
1) "one"
2) "four"
SMOVE移动某个元素到另一个set中,语法:SMOVE 源set 目的set 元素
127.0.0.1:6379> SADD set one two four
(integer) 3
127.0.0.1:6379> SADD set1 ok
(integer) 1
127.0.0.1:6379> SMOVE set set1 two
(integer) 1
127.0.0.1:6379> SMEMBERS set
1) "one"
2) "four"
127.0.0.1:6379> SMEMBERS set1
1) "two"
2) "ok"
SDIFF一个set集合和另一个set集合的差集
127.0.0.1:6379> SADD s1 a1 a2 a3(integer) 3127.0.0.1:6379> SADD s2 a2 a3 a5 a6(integer) 4127.0.0.1:6379> SDIFF s1 s21) "a1"127.0.0.1:6379> SDIFF s2 s11) "a5"2) "a6"
SINTER一个set集合和另一个set集合的交集
127.0.0.1:6379> SINTER s1 s21) "a3"2) "a2"
SUNION一个set集合和另一个set集合的并集
127.0.0.1:6379> SUNION s1 s21) "a5"2) "a3"3) "a6"4) "a2"5) "a1"
学习参考狂神说java