12_ Redis_ Bitmap_ command

Bitmap

Bitmap Detailed explanation

Bit storage

Statistics user information , active , Inactive ! Sign in 、 Not logged in ! Clock in ,365 Clock in ! Two states of , You can use Bitmap !

Bitmap Bitmap , data structure ! It's all operating bits to record , Only 0 and 1 Two states !

Use bitmap To record clocks from Monday to Sunday !

Monday ∶1 Tuesday ∶0 Wednesday :0 Thursday :1 Friday ：0 Saturday ：1 Sunday ：0

127.0.0.1:6379> setbit sign 0 1 // Set the daily clock in situation
(integer) 0
127.0.0.1:6379> setbit sign 1 0
(integer) 0
127.0.0.1:6379> setbit sign 2 0
(integer) 0
127.0.0.1:6379> setbit sign 3 1
(integer) 0
127.0.0.1:6379> setbit sign 4 0
(integer) 0
127.0.0.1:6379> setbit sign 5 1
(integer) 0
127.0.0.1:6379> setbit sign 6 0
(integer) 0
127.0.0.1:6379> getbit sign 3 // Check whether you punch in on Thursday !
(integer) 1
127.0.0.1:6379> getbit sign 6
(integer) 0
127.0.0.1:6379> bitcount sign // Count the days of clocking in a week !
(integer) 3