将内存中的一段数据拷贝到另外一段内存中，要考虑其中的内存覆盖问题。-A section of the memory to copy data to another section of memory, it is necessary to take into account the memory coverage problems.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001043s ]
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:0.072666s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.000927s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001154s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001061s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003239s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000994s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.004548s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.021958s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001012s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 259830 [ RunTime:0.020270s ]
