一个简单实现Ethernet数据帧封装和计算 CRC 校验的功能的程序，供新手参考-achieve a simple Ethernet data frames Packaging, and CRC calculation of the function of the procedures for newcomers reference
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001285s ]
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:0.089188s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001237s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001876s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001218s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003736s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001078s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003229s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014886s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001366s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 194862 [ RunTime:0.001247s ]
