这时关于树的一些操作的程序，包括建立，遍历....对学习数据结构的朋友一定有用-This programe implements some operation of tree,for example,construction,traversal and so on.It is very useful for people who study data structure.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001457s ]
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:0.087118s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001139s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001828s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001115s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003542s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000945s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003103s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015508s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001213s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 312607 [ RunTime:0.001451s ]
