Algorithm arranging the Sequence of Records... UP and DOWN arrow

Question

Is there some kind of algorithm for sequence of existing records with up and down arrows?
Move a record up (up arrow)
Move a record down (down arrow)
I think i need a scrollable resultset (update query) position = ++; etc somthing like that, can someone post a algorithm or sample code (scriplet)
Thank you in advance

Answer 1

I have a database field named secuence
Somthing is wrong with this code 10 dukes thank you in advance:
<%
Statement stmt3 = con.createStatement();
String iSeq =request.getParameter("seq");
String iID =request.getParameter("ID");
String action=request.getParameter("action");
if (request.getParameter("action") != null && action.equals("moveup")) {
          String sql = "update hog_evenementen " +
                    "set sequence = "+ iSeq +" - 1 where id = "+ iID +"; " +
                    "update hog_evenementen " +
                    "set sequence = (sequence + 1) where (sequence = "+ iSeq +" - 1) AND (id <> "+ iID +")";
          stmt3.executeUpdate(sql);
} else if (request.getParameter("action") != null && action.equals("movedown")) {
          String sql = "update hog_evenementen " +
                    "set sequence = "+ iSeq +" + 1 where id = "+ iID +"; " +
                    "update tblTest " +
                    "set sequence = (sequence - 1) where (sequence = "+ iSeq +" + 1) AND (id <> "+ iID +")";
          stmt3.executeUpdate(sql);
%>
Links that move records up and down:
<a href="evenement.jsp?action=moveup&id=<%=id%>&seq=<%=sequence%>"><img src="images/hog_omhoog_icon.gif" alt="Omhoog" width="12" height="14" border="0"></a></div></td>
<a href="evenement.jsp?action=moveup&id=<%=id%>&seq=<%=sequence%>"><img src="images/hog_omlaag_icon.gif" alt="Omlaag" width="12" height="14" border="0"></a></div></td>