code: public int deleteCascade(Collection<Contents> contentsCollection,
  			boolean userTable) throws SQLException {
  		int count = 0;
  		if (contentsCollection != null) {
  			for (Contents contents : contentsCollection) {
  				count += deleteCascade(contents, userTable);
  			}
  		}
  		return count;
  	}
docs: Delete the collection of Contents, cascading optionally including the
  user table
  
  @param contentsCollection
  contents collection
  @param userTable
  true if a user table
  @return deleted count
  @throws SQLException
  upon deletion error