Using functions in Resultset while getting database data.

Question

Well I'm trying to reset my resultset and it doesn't work.
Frist I extract data from it. Then I want to start to get other data from hte beginning again. Is this not possible. Can I just get thew data once.
I'm working with an access database and developping at Oracle 10g
<select name="kundKontakter" size="1" >          
           <%         
            do{
             String OID_kont =resultatKontaktNamn.getString("OID_kont");
             String namnKontakt = resultatKontaktNamn.getString("fKontaktNamn");
            <option value="<%=OID_kont%>" SELECTED><%=namnKontakt%>
            </option>
          <%
            }while(resultatKontaktNamn.next()); %>         
            </select>
            </td>
        </tr>
        <%resultatKontaktNamn.first();%>
        <tr><td>telefon</td>
        <td><input type="text" name="tel" size="40">
         <%=resultatKontaktNamn.getString("tel")%></td></tr>
        </tr>

Answer 1

No, normally result sets are read-once. If you need to get at data multiple times, you should read it into an an-memory table structure, like a List of Maps (or a List of objects that represent a row on the DB...)
So, for example, make a class:
public class Kontakt {
  private String namn, OID, tel;
  public Kontakt(String id, String n, String t) {
    namn = n; OID = id; telefon = t;
  public String getNamn() { return namn; }
  public String getOID() { return OID; }
  public String getTelefon() { return telefon; }
}Then when you access the database you fill up a java.util.List with a bunch of instances of this class...
  java.util.List kontaktList = new java.util.ArrayList();
  while(resultatKontaktNamn.next()) {
    String OID_kont =resultatKontaktNamn.getString("OID_kont");
    String namnKontakt = resultatKontaktNamn.getString("fKontaktNamn");
    String telefonKontakt = resultatKontaktNamn.getString("tel");
    Kontakt k = new Kontakt(OID_kont, namnKontakt, telKontakt);
    kontaktList.add(k);
  }That all done before you try any display.
Then, your JSP output will look like this:
    <select name="kundKontakter" size="1">
    <%
      for (java.util.Iterator i = kontaktList.iterator(); i.hasNext(); ) {
        Kontakt kont = (Kontakt)i.next();
    %>
        <option value="<%= kont.getOID()%>" selected="selected"><%= kont.getNamn()%></option>
    <%
    %>
    </select>
  </td>
</tr>
<tr>
  <td>telefon</td>
  <td><input type="text" name="tel" size="40">
    <%= ((Kontakt)kontaktList.get(0)).getTelefon() %></input>
  </td>
</tr>