小编Sha*_*iko的帖子

Explain
SELECT `feed_objects`.*
FROM `feed_objects`
WHERE (`feed_objects`.feed_id IN
  ( 165,160,159,158,157,153,152,151,150,149,148,147,129,128,127,126,125,124,122,
    121, 120,119,118,117,116,115,114,113,111,110)) ;

+----+-------------+--------------+------+---------------+------+---------+------+------+-------------+
| id | select_type | table        | type | possible_keys | key  | key_len | ref  | rows | Extra       |
+----+-------------+--------------+------+---------------+------+---------+------+------+-------------+
|  1 | SIMPLE      | feed_objects | ALL  | by_feed_id    | NULL | NULL    | NULL |  188 | Using where |
+----+-------------+--------------+------+---------------+------+---------+------+------+-------------+

未使用索引 by_feed_id

但当我指出的价值低于WHERE- 时,一切都正常

Explain
SELECT `feed_objects`.*
FROM `feed_objects`
WHERE (`feed_objects`.feed_id IN
  (165,160,159,158,157,153,152,151,150,149,148,147,129,128,127,125,124)) ;

+----+-------------+--------------+-------+---------------+------------+---------+------+------+-------------+
| id | select_type …

建议什么可以解析Ruby中的GPX文件？

我尝试过gpx,但它不适用于Ruby Enterprise Edition(https://github.com/dougfales/gpx/issues/1).

我不想写一个解析器.