实现对学生资料的查询、删除、增加和修改，老师可以实现以上所有功能，而学生只能查询。-Information on the implementation of the students information, delete, and modify the increase, teachers can achieve all of the above functions, and students can only query.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.010154s ]
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:0.133608s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001055s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001272s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001025s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003910s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.005810s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.006166s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016321s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001095s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 137465 [ RunTime:0.015591s ]
