docs: protected String getUniqueString(FieldDescriptor field) throws SequenceManagerException
      {
          ResultSetAndStatement rsStmt = null;
          String returnValue = null;
          try
          {
              rsStmt = getBrokerForClass().serviceJdbcAccess().executeSQL(
                      "select newid()", field.getClassDescriptor(), Query.NOT_SCROLLABLE);
              if (rsStmt.m_rs.next())
              {
                  returnValue = rsStmt.m_rs.getString(1);
              }
              else
              {
                  LoggerFactory.getDefaultLogger().error(this.getClass()
                          + ": Can't lookup new oid for field " + field);
              }
          }
          catch (PersistenceBrokerException e)
          {
              throw new SequenceManagerException(e);
          }
          catch (SQLException e)
          {
              throw new SequenceManagerException(e);
          }
  
          finally
          {
              // close the used resources
              if (rsStmt != null) rsStmt.close();
          }
          return returnValue;
      }