text: --Test db_attribute by creating class with default object attribute 
  
  create class test_ob_class (col1 varchar(10),col2 date);
  insert into test_ob_class values('nhnchina',to_date('20080427','yyyymmdd')) into :arg1;
  
  
  create class test_class (col1 integer, col2 test_ob_class default :arg1);
  
  
  
  select attr_name, class_name
  from   db_attribute
  where  class_name = 'test_class' order by 1,2;
  
  drop class test_ob_class;
  drop class test_class;
  
  
  
  