--- a/m-toolbox/classes/@ltpda_uo/retrieve.m	Mon Dec 05 16:20:06 2011 +0100
+++ b/m-toolbox/classes/@ltpda_uo/retrieve.m	Mon Dec 05 16:20:06 2011 +0100
@@ -66,13 +66,8 @@
     utils.helper.msg(msg.PROC1, 'retrieving collection %d', cid);
 
     % get list of object IDs from the collection ID
-    rows = utils.mysql.execute(conn, 'SELECT nobjs, obj_ids FROM collections WHERE id = ?', cid);
-    nobjs = rows{1};
-    ids = strread(rows{2}, '%d', 'delimiter', ',');
-    if length(ids) ~= nobjs
-      error('### inconsistent collection description');
-    end
-
+    ids = utils.repository.getCollectionIDs(conn, cid);
+    
   else
     % IDs list
     if isnumeric([varargin{:}])
@@ -90,12 +85,7 @@
   try
 
     % get username and user id
-    username = utils.mysql.execute(conn, 'SELECT SUBSTRING_INDEX(USER(),''@'',1)');
-    rows     = utils.mysql.execute(conn, 'SELECT id FROM users WHERE username = ?', username{1});
-    if isempty(rows)
-      error('### could not determine user id');
-    end
-    userid = rows{1};
+    [username, userid] = utils.repository.getUser(conn);
 
     v = ver('LTPDA');
     for j=1:length(ids)