空间数据库中空间数据结构的应用，K-d树基本操作的源码，都在这个文档中。-spatial database structure of the data space applications, K-d trees basic operation of the source code in the documents.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.000986s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.079872s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001326s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001918s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001309s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.006778s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001517s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.006697s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.051923s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.015846s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 286436 [ RunTime:0.042695s ]
