建立一颗用二叉链表方式存储的二叉树，并对其遍历，打印输出遍历结果。-The establishment of a list with the 2 fork stored in a binary tree, and its traverse, traverse the results printout.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002411s ]
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:0.137883s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002887s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.003300s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002731s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.006264s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002263s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003565s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015880s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002989s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 206211 [ RunTime:0.001536s ]
