更新怎么成插入了
DBCon db=new DBCon();
Connection con=db.getCon();
PreparedStatement stmt=con.prepareStatement("UPDATE stu set name=?,english=?,math=?,jsp=? where id=?");
stmt.setString(1,name);
stmt.setInt(2,english);
stmt.setInt(3,math);
stmt.setInt(4,jsp);
stmt.setInt(5,id);
return stmt.execute();
怎么插入了,id 号相同