程序的互斥运行
如果你的程序被同时运行两次以上，有可能会造成文件系统冲突而丢失数据，本例程用一个简单的办法避免第二次启动同一个程序。-operating procedures contradict the procedure if you are running two or more, and may cause conflicts and file system data loss, the routines with a simple way to avoid the second started with a procedure.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002239s ]
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:0.087699s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002850s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002274s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002611s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.004411s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002668s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.004555s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.018013s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.003191s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 320384 [ RunTime:0.001345s ]
