* @return String - Nome/valor da(s) chave(s)
*/
private String getPkName(Object o) {
StringBuffer r = new StringBuffer();
Configuration conf = HibernateUtil.getConfiguration();
Mappings map = conf.createMappings();
if (o!=null && o.getClass().getName()!=null && map.getClass(o.getClass().getName())!=null) {
Table tab = map.getClass(o.getClass().getName()).getTable();
PrimaryKey pk = tab.getPrimaryKey();
Iterator itr = pk.getColumnIterator();
while (itr.hasNext()) {
Column col = (Column) itr.next();
String colname = col.getName();