How to use one ResultSet many times in a jsp page ?

Question

Hi all,
I have .jsp page and I have used it to get data from DB and display them to users. So I have to get data from DB in number of places in this particular jsp.
I thought that it is better to have one ResultSet for entire page and once it is done its job, the ResultSet will be closed and I can use it again and again like this.
Resultset rs = new ResultSet();
try{
    //My operations
}catch(Exception ex){
   //Handle Exceptions
}finally{
   rs.close();
}After above code snippet I can use same ResultSet again below the page.
I just want to know this,
1. is this a good coding practice?
2. Should i put rs = null; within finally clause?
any help will be appreciated
thank in advance,
Dilan.

Answer 1

Ok, Finally I switched my coding to use DAO and DTO, and I learned it through internet.
I removed all of data access codes from my jsp file(lets say 'functions.jsp'). I then created one interface and two clasess.
here is my DAO interface.
public interface UserFunctionsDAO{
    public List<UserFunctionsDTO> selectUserList();
}here is DTO class
public class UserFunctionsDTO{
    private String category = "";
    private String sub_category = "";
    private int cat_id = 0;
    private int sub_cat_id = 0;
    public UserFunctionsDTO(){}
    public UserFunctionsDTO(String category, String sub_category, int cat_id, int sub_cat_id){
        this.category = category;
        this.sub_category = sub_category;
        this.cat_id = cat_id;
        this.sub_cat_id = sub_cat_id;
    //Setters and getters will go here.
}my concrete data access class is like this.
public class UserFunctionsDataAccess implements UserFunctionsDAO{
    MyDB dbObject = null;
   private static final String SQL_GET_DISTINCT_CAT= "SELECT DISTINCT cat FROM cat_table";
   public List<UserFunctionsDTO> selectUserList(){
       dbObject = new MyDB();
       dbObject.sqlSelect(SQL_GET_DISTINCT_CAT);
       ResultSet rs = dbObject.getResultSet();
       ArrayList list = new ArrayList();
       while(rs.next()){
           list.add(new UserFunctionsDTO(rs.getString('category'), .......................));
       return list;     
}I think now im following good coding practices, but I have one problem.
1. How do I retrieve this userlist from my jsp page?
2. Should I include UserFunctionsDTO in my jsp page as a bean?
3. If I include it, how can I get the list from it?
thanks in advance,
Dilan.