实现一个数据库的连接池，提高数据库的链接效率，同时还有利于平衡物理上的访问量。-Implement a database connection pool to improve the efficiency of the database links, while also help balance the amount of physical access.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001246s ]
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:0.087061s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001197s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001915s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001320s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003555s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001023s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003168s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014416s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001303s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 173551 [ RunTime:0.001204s ]
