Access无效的游标状态，求大神帮忙啊

Question

代码及错误信息如下：
Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
Connection conn = DriverManager.getConnection("jdbc:odbc:D");
Statement stat = conn.createStatement(ResultSet.TYPE_SCROLL_SENSITIVE, ResultSet.CONCUR_UPDATABLE);
ResultSet rs_Type=stat.executeQuery("select Type from tb_bookinfo group by Type");
String PType="";
if (request.getParameter("Type")!=null){
PType=chStr.chStr(request.getParameter("Type"));
}else{
if(rs_Type.next()){
PType=rs_Type.getString("Type");
}else{
response.sendRedirect("index.jsp");
}
}
rs_Type.first();
do{ //此处必须用do...while，否则会少一条记录
String Type1=rs_Type.getString("Type");//错误指向这，说是无效的游标状态
//out.println("alert('"+String.valueOf(Type1)+"ID号')");
%>