jsp servlet mysql jquery ajax功能：学生信息管理、包括学生信息的新增、编辑、查看、删除，班级信息管理、包括班级信息的新增、编辑、查看、删除，教师信息管理、包括教师信息的新增、编辑、查看、删除，其中学生、教师、管理员都有自己的密码用来登录系统，且各个角色权限不一样，管理员有所有权限、教师只有班级管理和学生管理权限、学生只能查看和修改自己信息。
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001119s ]
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:0.061525s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000937s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001187s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001004s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003130s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000814s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003691s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014750s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001076s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 332644 [ RunTime:0.017070s ]
