string str="insert into students(ID,FIRST_NAME,last_Name,major,CURRENT_CREDITS) values(STUDENT_SEQUENCE.nextval,@firstname,'sdf','ddd',2)";-->string str="insert into students(ID,FIRST_NAME,last_Name,major,CURRENT_CREDITS) values(STUDENT_SEQUENCE.nextval,?,'sdf','ddd',2)";
我刚用.net,是不是参数写得错了?