类似于iBatis,使用sqlmap文件保存sql，支持单个select,update,delete,也支持批量sql执行，先执行完的结果可以作为下一个sql的输入，支持事务，支持存储过程，输入参数可以是class或map或者没有，输出可以是dataset, class object,class objectslist,map,maps list.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.000972s ]
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:0.122658s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001358s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001381s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001513s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003683s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001948s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.004162s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015547s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001024s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 261322 [ RunTime:0.013290s ]
