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Creating high score leaderboards with Redis
NOTE: You will need at least Redis 2.1.6 to use the ZREVRANGEBYSCORE method.
Add players to HIGHSCORES table:
fossil:~ dczarnecki$ redis-cli
redis> zadd HIGHSCORES 1 player_1
(integer) 1
redis> zadd HIGHSCORES 2 player_2
(integer) 1
redis> zadd HIGHSCORES 3 player_3
(integer) 1
redis> zadd HIGHSCORES 4 player_4
(integer) 1
redis> zadd HIGHSCORES 4 player_5
(integer) 1
redis> zadd HIGHSCORES 6 player_6
(integer) 1
redis> zadd HIGHSCORES 7 player_7
(integer) 1
redis> zadd HIGHSCORES 8 player_8
(integer) 1
redis> zadd HIGHSCORES 9 player_9
(integer) 1
redis> zadd HIGHSCORES 10 player_10
(integer) 1
Find out how many players are in the HIGHSCORES table:
redis> zcard HIGHSCORES
(integer) 10
Print out all the players that are in the HIGHSCORES table:
redis> zrangebyscore HIGHSCORES -inf +inf WITHSCORES
1. "player_1"
2. "1"
3. "player_2"
4. "2"
5. "player_3"
6. "3"
7. "player_4"
8. "4"
9. "player_5"
10. "4"
11. "player_6"
12. "6"
13. "player_7"
14. "7"
15. "player_8"
16. "8"
17. "player_9"
18. "9"
19. "player_10"
20. "10"
Print out the 1st page of the HIGHSCORES table:
redis> zrangebyscore HIGHSCORES -inf +inf WITHSCORES LIMIT 0 5
1) "player_1"
2) "1"
3) "player_2"
4) "2"
5) "player_3"
6) "3"
7) "player_4"
8) "4"
9) "player_5"
10) "4"
Print out the 2nd page of the HIGHSCORES table:
redis> zrangebyscore HIGHSCORES -inf +inf WITHSCORES LIMIT 5 -1
1) "player_6"
2) "6"
3) "player_7"
4) "7"
5) "player_8"
6) "8"
7) "player_9"
8) "9"
9) "player_10"
10) "10"
Print out all the players that are in the HIGHSCORES table from highest score to lowest score:
redis> zrevrangebyscore HIGHSCORES +inf -inf WITHSCORES
1) "player_10"
2) "10"
3) "player_9"
4) "9"
5) "player_8"
6) "8"
7) "player_7"
8) "7"
9) "player_6"
10) "6"
11) "player_5"
12) "4"
13) "player_4"
14) "4"
15) "player_3"
16) "3"
17) "player_2"
18) "2"
19) "player_1"
20) "1"
Print out the 1st page of players that are in the HIGHSCORES table from highest score to lowest score:
redis> zrevrangebyscore HIGHSCORES +inf -inf WITHSCORES LIMIT 0 5
1) "player_10"
2) "10"
3) "player_9"
4) "9"
5) "player_8"
6) "8"
7) "player_7"
8) "7"
9) "player_6"
10) "6"
Print out the 2nd page of players that are in the HIGHSCORES table from highest score to lowest score:
redis> zrevrangebyscore HIGHSCORES +inf -inf WITHSCORES LIMIT 5 -1
1) "player_5"
2) "4"
3) "player_4"
4) "4"
5) "player_3"
6) "3"
7) "player_2"
8) "2"
9) "player_1"
10) "1"
Create an "Around Me" leaderboard with scores of individuals above and below me:
Find rank in reverse order:
redis> zrevrank HIGHSCORES player_6
(integer) 5
Get players above a given player:
redis> zrevrangebyscore HIGHSCORES +inf -inf WITHSCORES LIMIT 2 3
1) "player_9"
2) "9"
3) "player_8"
4) "8"
5) "player_7"
6) "7"
Get players below a given player:
redis> zrevrangebyscore HIGHSCORES +inf -inf WITHSCORES LIMIT 6 3
1) "player_5"
2) "4"
3) "player_4"
4) "4"
5) "player_3"
6) "3"
Another "Around Me" leaderboard:
redis> zrevrank HIGHSCORES player_4
(integer) 7
redis> zrevrangebyscore HIGHSCORES +inf -inf WITHSCORES LIMIT 4 3
1) "player_7"
2) "7"
3) "player_6"
4) "6"
5) "player_5"
6) "4"
redis> zrevrangebyscore HIGHSCORES +inf -inf WITHSCORES LIMIT 8 3
1) "player_3"
2) "3"
3) "player_2"
4) "2"
5) "player_1"
6) "1"
Actually, let's simplify the "Around Me" leaderboard to just be 2 calls and include the individual in the leaderboard results:
redis> zrevrank HIGHSCORES player_6
(integer) 4
redis> zrevrangebyscore HIGHSCORES +inf -inf WITHSCORES LIMIT 1 7
1. "player_9"
2. "9"
3. "player_8"
4. "8"
5. "player_7"
6. "7"
7. "player_6"
8. "6"
9. "player_5"
10. "4"
11. "player_4"
12. "4"
13. "player_3"
14. "3"
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