java已定义的异常类一般情况下能满足开发应用，但一些业务逻辑方面的异常则需要进行自定义。-java exception classes defined under normal circumstances to meet the development and application, but some of the unusual aspects of business logic you need to customize.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002042s ]
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:0.095450s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.007022s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001286s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001166s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003559s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001028s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.004667s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016609s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001057s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 49438 [ RunTime:0.018482s ]
