Redis set command line operation (intersection, union and difference, random reading, etc.)

Here to redis Of set Simple demonstration of how to use the command , It is helpful to understand the meaning and usage of relevant commands . Actual business scenarios should be combined redis The interface provided by the client performs relevant operations .

1. Add one set The order of sadd

127.0.0.1:6379> sadd setA 1 2 3
(integer) 3

127.0.0.1:6379> sadd setB 2 3 4
(integer) 3

2. Calculate two set The difference between the set

127.0.0.1:6379> sdiff setA setB
1) "1"
127.0.0.1:6379> sdiff setB setA
1) "4"

3. Calculate two set Intersection

127.0.0.1:6379> sinter setA setB
1) "2"
2) "3"

4. utilize set Realize random lottery

127.0.0.1:6379> SADD order 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010
(integer) 10
127.0.0.1:6379> SMEMBERS order
 1) "1001"
 2) "1002"
 3) "1003"
 4) "1004"
 5) "1005"
 6) "1006"
 7) "1007"
 8) "1008"
 9) "1009"
10) "1010"

127.0.0.1:6379> SPOP order 3
1) "1001"
2) "1003"
3) "1006"
127.0.0.1:6379> SPOP order 2
1) "1004"
2) "1002"
127.0.0.1:6379> SPOP order 1
1) "1007"

Add data to the set , Then view the data list in the collection , Random sampling 3 individual 、2 And 1 Data .

5. Like the model

127.0.0.1:6379> SADD like:1 1001 1002 1003 1004 1005
(integer) 5

# Delete attention 
127.0.0.1:6379> SREM like:1 1002
(integer) 1

#  Judge whether to pay attention to 
127.0.0.1:6379> SISMEMBER like:1 1002
(integer) 0
127.0.0.1:6379> SISMEMBER like:1 1005
(integer) 1

#  Check out the following list 
127.0.0.1:6379> SMEMBERS like:1
1) "1001"
2) "1003"
3) "1004"
4) "1005"

#  Check the number of followers 
127.0.0.1:6379> SCARD like:1
(integer) 4