February 2018
Intermediate to advanced
382 pages
11h 33m
English
Content preview from Redis 4.x Cookbook
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How to do it…
The steps for using bitmaps are as follows:
- Open a Terminal and connect to Redis with redis-cli
- Use SETBIT to set the bit value in a bitmap at the specified offset.
For example, when a user whose ID is 100 has tried the restaurant reservation feature in Relp, we set the corresponding bit:
127.0.0.1:6379> SETBIT "users_tried_reservation" 100 1(integer) 0
- To retrieve the bit value from a bitmap at the specified offset, the GETBIT command can be used.
For example, we would like to know if the user whose ID is 400 has ever tried online orders:
127.0.0.1:6379> GETBIT "users_tried_online_orders" 400(integer) 0
- To return the number of bits set to 1 in the bitmap, use the BITCOUNT command.
Suppose we would like to know how many ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.