将视图分割成两部分，左边为显示取，右边为数据录入区，每录入一个节点数据，立即在左边显示节点图形，能实现二叉树的插入、删除、前序遍历、中序遍历、后序遍历。-View will be divided into two parts, shown from left to right for the data entry areas, each node a data entry immediately on the left shows nodes graphics can achieve binary tree insertion, deletion, the former preorder, preorder, after preorder.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001882s ]
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:0.084696s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002289s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001928s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001948s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003577s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001810s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003206s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014835s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002375s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 120660 [ RunTime:0.001083s ]
