linux环境利用管道进行通讯的例子，父进程fork派生子进程，父子进程利用管道通讯。-linux environment using pipes to communicate examples of parent process fork derived sub-process, father and son process communication using pipes.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001169s ]
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:0.071233s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000972s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001102s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001009s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003101s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000757s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003591s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016850s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001172s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 168470 [ RunTime:0.015421s ]
