改成一句,去掉大循环里的小循环. rs=sql.executeQuery("select a.* b.count(*) from student_credit_record a, bad_record b where b.student_id= by a.student_id order a.student_id");
String sqlstring="select count(*) from bad_record where student_id="+param;这个语句只能读出表bad_record 中的student_id="+param的总数...返回一个记录...如果要全部读出就写成: String sqlstring="select * from bad_record where student_id="+param;
rs=sql.executeQuery("select a.* b.count(*) from student_credit_record a, bad_record b where b.student_id= by a.student_id order a.student_id");
谢谢你啊,很多人都没看出来,说了一大堆都不知道,真是太感谢了,我能够加你吗,我QQ 2988976
希望向你学习
String sqlstring="select * from bad_record where student_id="+param;