修改前：
INSERT into rdsay(p_id,id,say,catname,cat,source)
VALUES ((select max(p_id) from rdsay)+1,1234523,"aaa","bbb","ccc","ddd");
修改后：
INSERT into rdsay(p_id,id,say,catname,cat,source)
select max(p_id)+1,23189991720,"34567","Anime ","a","asfd"
from rdsay;