Redis Set(集合)

set 中的值是不能重复的！

无序不重复集合

基础用法

127.0.0.1:6379> sadd myset hello          # set 添加元素 
(integer) 1
127.0.0.1:6379> sadd myset world          # set 添加元素
(integer) 1
127.0.0.1:6379> SMEMBERS myset            # set 查看元素
1) "world"
2) "hello"
127.0.0.1:6379> sadd myset hello          # set 添加已经拥有的元素会返回0
(integer) 0
127.0.0.1:6379> SISMEMBER myset heool     # 判断 值 在set 是否存在  0：不存在  
(integer) 0
127.0.0.1:6379> SISMEMBER myset hello     # 判断 值 在set 是否存在  1：存在
(integer) 1
127.0.0.1:6379>

获取set的长度(scard)

127.0.0.1:6379> scard myset
(integer) 2
127.0.0.1:6379> sadd myset item
(integer) 1
127.0.0.1:6379> scard myset
(integer) 3
127.0.0.1:6379>

移除 set 中的元素(srem)

127.0.0.1:6379> SMEMBERS myset
1) "item"
2) "world"
3) "hello"
127.0.0.1:6379> srem myset item       # 移除 set 指定元素
(integer) 1
127.0.0.1:6379> scard myset
(integer) 2
127.0.0.1:6379> SMEMBERS myset
1) "world"
2) "hello"
127.0.0.1:6379>

随机获取 set 里面的数据(SRANDMEMBER)

127.0.0.1:6379> SMEMBERS myset
1) "item2"
2) "world"
3) "hello"
4) "item1"
5) "item3"
127.0.0.1:6379> SRANDMEMBER myset
"item2"
127.0.0.1:6379> SRANDMEMBER myset
"world"
127.0.0.1:6379> SRANDMEMBER myset
"item1"
127.0.0.1:6379> SRANDMEMBER myset
"item3"
127.0.0.1:6379> SRANDMEMBER myset
"world"
127.0.0.1:6379>

随机弹出元素（spop）

127.0.0.1:6379> SMEMBERS myset
1) "item3"
2) "hello"
3) "world"
4) "item1"
5) "item2"
127.0.0.1:6379> spop myset
"hello"
127.0.0.1:6379> spop myset
"world"
127.0.0.1:6379> spop myset
"item3"
127.0.0.1:6379> SMEMBERS myset
1) "item1"
2) "item2"
127.0.0.1:6379>

将一个指定的值，移动到另外一个set集合！（smove）

127.0.0.1:6379> sadd myset hello
(integer) 1
127.0.0.1:6379> sadd myset world
(integer) 1
127.0.0.1:6379> sadd myset item
(integer) 1
127.0.0.1:6379> sadd myset2 item1
(integer) 1
127.0.0.1:6379> smove myset myset2 hello
(integer) 1
127.0.0.1:6379> SMEMBERS myset
1) "item"
2) "world"
127.0.0.1:6379> SMEMBERS myset2
1) "hello"
2) "item1"
127.0.0.1:6379>

数据集合类：

- 差集

- 交集

- 并集

127.0.0.1:6379> sadd key1 a
(integer) 1
127.0.0.1:6379> sadd key1 b
(integer) 1
127.0.0.1:6379> sadd key1 c
(integer) 1
127.0.0.1:6379> sadd key2 c
(integer) 1
127.0.0.1:6379> sadd key2 d
(integer) 1
127.0.0.1:6379> sadd key2 e
(integer) 1
127.0.0.1:6379> sdiff key1 key2
1) "a"
2) "b"
127.0.0.1:6379> sinter key1 key2
1) "c"
127.0.0.1:6379> sunion key1 key2
1) "e"
2) "b"
3) "c"
4) "d"
5) "a"
127.0.0.1:6379>

Redis Set(集合)

Java相关栏目本月热门文章