二叉树的先序，中序，后序，按层遍历算法。以中序输入，用‘#’代替叶子节点的子节点输入。-binary tree first sequence, sequence after sequence, layer by traversal algorithm. The order to import, use "#" instead of the leaf nodes for input nodes.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001907s ]
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:0.143733s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001235s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001910s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001227s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003621s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001069s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003205s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015006s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001425s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 144043 [ RunTime:0.001383s ]
