Redis basic type - combined with set

aggregate Set： More than one value Value

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# sadd Put one or Multiple member elements are added to the collection , Can't repeat

# smembers Returns all members of a collection

# sismember Command to determine whether a member element is a member of a collection

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127.0.0.1:6379> sadd myset wyt
(integer) 1
127.0.0.1:6379> sadd myset lmp
(integer) 1
127.0.0.1:6379> sadd myset lmp
(integer) 0
127.0.0.1:6379> smembers myset
1) "wyt"
2) "lmp"
127.0.0.1:6379> sismember myset hyd
(integer) 0
127.0.0.1:6379> sismember myset wyt
(integer) 1
 

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# scard : Get the number of elements in the collection

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127.0.0.1:6379> scard myset
(integer) 2
 

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# srem  key value : Used to remove one or more member elements from a collection

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127.0.0.1:6379> srem myset wyt
(integer) 1
127.0.0.1:6379> smembers myset
1) "lmp"
 

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# srandmember  key : The command returns a random element in the collection

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127.0.0.1:6379> smembers myset
1) "hyd"
2) "lmp"
3) "yjy"
4) "syy"
5) "wyt"
6) "gqy"
127.0.0.1:6379> srandmember myset
"syy"
127.0.0.1:6379> srandmember myset 2
1) "lmp"
2) "gqy"
127.0.0.1:6379> srandmember myset 2
1) "wyt"
2) "yjy"
 

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# spop  key : Used to remove the specified key One or more random elements of

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127.0.0.1:6379> smembers myset
1) "lmp"
2) "hyd"
3) "syy"
4) "yjy"
5) "wyt"
6) "gqy"
127.0.0.1:6379> spop myset
"gqy"
127.0.0.1:6379> spop myset
"syy"
127.0.0.1:6379> spop myset
"wyt"
127.0.0.1:6379> smembers myset
1) "lmp"
2) "hyd"
3) "yjy"
 

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# smove source destination  member

# Members will be specified member Elements from source The assembly moves to destination aggregate  

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127.0.0.1:6379> sadd myset wyt
(integer) 1
127.0.0.1:6379> sadd myset lmp
(integer) 1
127.0.0.1:6379> sadd myset hyd
(integer) 1
127.0.0.1:6379> sadd myset yjy
(integer) 1
127.0.0.1:6379> sadd myset syy
(integer) 1
127.0.0.1:6379> sadd myset gqy
(integer) 1
127.0.0.1:6379> smembers myset
1) "hyd"
2) "lmp"
3) "yjy"
4) "syy"
5) "wyt"
6) "gqy"
127.0.0.1:6379> smembers myset1
1) "hyd"
2) "lmp"

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- Number set class
      - Difference set ：sdiff

      - intersection ：sinter

      - Combine ：sunion

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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) "b"
2) "a"
3) "d"
4) "e"
5) "c"
 

In microblog applications , You can put all the followers of a user in a collection , Put all its fans in a collection .Redis Also for Sets provide a way to find intersections 、 Combine 、 Subtraction and so on , Can be very convenient to achieve such as common concern 、 Common preferences 、 Second degree friend and other skills can , For all of the above set operations , You can also use different commands to choose whether to return the results to the client or save them to a new set Syncretic