交换机的原理与配置，包括功能，用途，原理，如何设置等的详细介绍！-switchboard in principle and configuration, including the function, purpose, principle, how to set up such a detailed description!
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001716s ]
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:0.089805s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002511s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.003016s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002269s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003595s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001871s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003280s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015249s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002511s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 261917 [ RunTime:0.001066s ]
