利用积分法进行多线程计算圆周率pai的编程，分别有二、三、四个线程-The use of integral method for calculation of multi-threaded programming pai pi, respectively, have two, three, four threads
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001416s ]
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:0.106150s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001411s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002180s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001377s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003800s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001320s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003476s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015586s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001396s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 167717 [ RunTime:0.001359s ]
