<自己动手写操作系统>源代码第4章，其中所有代码都已通过调试，之间包括可运行程序，直接下载到虚拟机上可以运行。- source code, Chapter 4, which have passed all of the code debugging, including operational procedures between the directly downloaded to the virtual machine can run.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002011s ]
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:0.116386s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002617s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002290s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002416s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.004009s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002173s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003235s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014920s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002797s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 145290 [ RunTime:0.001314s ]
