封装了一个数据库操作类，可以可以方便的定义数据库变量和记录集变量，可以调用里面的excute函数执行sql语言-Packaging a database-type operations can be easily defined database recordset variables and variables, you can excute function call inside the implementation of sql language
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.000907s ]
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:0.780974s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.056141s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.009931s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.028203s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.005844s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.045534s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.019164s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.051066s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.035697s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 206379 [ RunTime:0.020322s ]
