详细介绍51单片机操作系统，包括keilc编译环境的库函数以及其功能，还有如何调用这些函数。-detailed 51 microcontroller operating systems, including keilc build environment of the library function and its function. Besides calling these functions.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001154s ]
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:0.074072s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001068s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001129s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001220s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003090s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000963s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003872s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016498s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001051s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 166761 [ RunTime:0.016689s ]
