关于串口的编程示例，代码实现对串口的管理功能，可供学习和参考。-on serial programming examples, the source implementation of the serial port management functions, available for study and reference.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001787s ]
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:0.162351s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001756s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.003363s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001847s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.006616s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001513s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.006287s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.018633s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001594s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 282623 [ RunTime:0.001235s ]
