Redis基本数据类型介绍及相关方法介绍笔记--Set类型

Redis五种数据类型之 SETS类型

SETS集合 是string类型的无序集合，通过hashtable实现，CRD操作复杂度为0(1),可取并交差集。 

下面切入正题咯：

 常用命令总结(自用总结 不喜勿喷)：

 

1.sadd方法

向名称为key的set中添加元素,添加相同元素时不成功喔,集合中不允许有重复的值

eg:

127.0.0.1:6379> sadd testset "harbor"

(integer) 1

127.0.0.1:6379> sadd testset "harborChung"

(integer) 1

127.0.0.1:6379> sadd testset "harborchung"

(integer) 1

127.0.0.1:6379> sadd testset "Chung"

(integer) 1

127.0.0.1:6379> sadd testset "chung"

(integer) 1

 

2.semembers方法

查看指定集合的元素

eg:

127.0.0.1:6379> sadd testset "chung"

(integer) 0

 

3.srem方法

删除名称为key的set中的元素

 eg:

127.0.0.1:6379> smembers testset

1) "harborchung"

2) "harbor"

3) "harborChung"

4) "chung"

5) "Chung"

127.0.0.1:6379> srem testset "harbor"

(integer) 1

127.0.0.1:6379> smembers testset

1) "harborChung"

2) "chung"

3) "Chung"

4) “harborchung”

 

4.spop 方法

随机返回并删除名称为key的set中的一个元素,返回值为删除的元素值

eg:

127.0.0.1:6379> spop testset 

"chung"

127.0.0.1:6379> spop testset 

"Chung"

127.0.0.1:6379> smembers testset

1) "harborChung"

2) "harborchung"

 

5.sdiff方法

返回所有给定key与第一个key的差集

以在前面的集合名称为标准 取差集

eg:

127.0.0.1:6379> sadd set1 "harbor"

(integer) 1

127.0.0.1:6379> sadd set1 "harborChung"

(integer) 1

127.0.0.1:6379> sadd set2 "harborChung"

(integer) 1

127.0.0.1:6379> sadd set2 "Chung"

(integer) 1

127.0.0.1:6379> sdiff set1 set2

1) "harbor"

127.0.0.1:6379> sdiff set2 set2

(empty list or set)

127.0.0.1:6379> sdiff set2 set1

1) “Chung"

 

6.sdiffstore方法

返回所有给定key与第一个key的差集，并将其赋予给另一个key中

eg:

127.0.0.1:6379> sdiffstore set2 set1 set3

(integer) 1

127.0.0.1:6379> smembers set3

1)“harborchung"

 

7.sinter方法

返回所有给定key的交集

eg:

127.0.0.1:6379> sinter set1 set2

1) "harborChung"

2) "harbor"

 

8.sinterstore方法

返回所有给定key的交集并将结果存到另一个集合当中

eg:

127.0.0.1:6379> sinterstore set1 set2 set4

1) "harborChung"

2) “harbor”

127.0.0.1:6379> smembers set4

1) "harborChung"

2) “harbor”

 

9.sunion方法

返回所有给定key的并集

eg:

127.0.0.1:6379> smembers set1

1) "harbor"

2) "chong"

3) "zhong"

127.0.0.1:6379> smembers set2

1) "harbor"

2) "harborChung"

127.0.0.1:6379> sunion set1 set2

1) "harborChung"

2) "chong"

3) "harbor"

4) "zhong"

 

10.sunionstore方法

返回所有给定key的并集并将结果存到另一个集合当中

eg:

127.0.0.1:6379> sunionstore set1 set2 set3

(integer) 4

127.0.0.1:6379> smembers set13

1) "harborChung"

2) "chong"

3) "harbor"

4) “zhong"

 

11.smove方法

从第一个key对应的set中移除member并添加到第二个集合中

eg:

127.0.0.1:6379> sadd setO1 "one"

(integer) 1

127.0.0.1:6379> sadd setO1 "two"

(integer) 1

127.0.0.1:6379> sadd setO2 "two"

(integer) 1

127.0.0.1:6379> sadd setO2 "three"

(integer) 1

127.0.0.1:6379> smove setO2 set03 "three"

(integer) 1

127.0.0.1:6379> smembers set03

1) “three"

 

12.scard方法

查看集合元素个数

eg:

127.0.0.1:6379> smembers set03

1) "three"

127.0.0.1:6379> scard set03

(integer) 1

127.0.0.1:6379> scard setO2

(integer) 1

127.0.0.1:6379> scard setO1

(integer) 2

127.0.0.1:6379> smembers setO2

1) "two"

127.0.0.1:6379> smembers setO1

1) "one"

2) "two"

 

13.sismember方法

判断某个元素是否是该集合的元素,返回值1代表是0代表不是

eg:

127.0.0.1:6379> sismember setO1 one

(integer) 1

127.0.0.1:6379> sismember setO1 hoho

(integer) 0

 

14.srandmember方法

随机返回名称为key的set的一个元素，不删除元素

eg:

127.0.0.1:6379> srandmember setO1

"two"

127.0.0.1:6379> srandmember setO1

"one"

127.0.0.1:6379> srandmember setO1

"two"

127.0.0.1:6379> srandmember setO1

"one"

127.0.0.1:6379> srandmember setO1

"one"

 

15.SPOP方法

随机返回名称为key的set的一个元素并删除元素

127.0.0.1:6379> SPOP setO1

"two"

127.0.0.1:6379> smembers setO1

“one"