fd_set参数：一个用于检查可读性（readfds），一个用于检查可写性（writefds），另一个用于例外数据（exceptfds）。从根本上说，
fd_set数据类型代表着一系列特定套接字的集合-fd_set parameters : a check for readability (readfds) one could write a check for (writefds) Another exception for the data (exceptfds). Fundamentally speaking, fd_set data types represent the range of specific set of socket
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001897s ]
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:0.084831s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002519s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002161s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003568s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002049s ]
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SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014214s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002455s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 301650 [ RunTime:0.001122s ]
