二叉树测试操作，二叉树的建立，旋转，删除测试等等。可以进行二叉树的学习，参考。-Binary test operations, the establishment of a binary tree, rotate, delete the test and so on. Binary tree can be learning, reference.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001154s ]
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:0.078440s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001067s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001317s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001009s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003082s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000855s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.004058s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014777s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.000981s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 165398 [ RunTime:0.019544s ]
