经常用到的 socketAPI，posix thread 的类封装，还有一些同步设施 智能指针的实现，线程安全的引用计数-frequently used the socketAPI, posix thread-like packaging, there are some smart synchronization facilities to achieve the target, thread-safe reference counting
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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:0.094148s ]
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SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001736s ]
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UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 179781 [ RunTime:0.001507s ]
