用于简单管道的水击计算，采用的特征线法。可自行修改管道参数。-For a simple pipeline water hammer calculation, using the characteristic line method. Pipeline can modify the parameters.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002135s ]
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:0.086317s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002293s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001965s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002294s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003871s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001888s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003340s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015565s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002582s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 316926 [ RunTime:0.001166s ]
