public function __construct()
 {
     parent::__construct(self::B2DBNAME, self::ID);
     parent::_addForeignKeyColumn(self::UID, TBGUsersTable::getTable(), TBGUsersTable::ID);
     parent::_addForeignKeyColumn(self::SCOPE, TBGScopesTable::getTable(), TBGScopesTable::ID);
     parent::_addVarchar(self::REAL_FILENAME, 250);
     parent::_addVarchar(self::CONTENT_TYPE, 250);
     parent::_addVarchar(self::ORIGINAL_FILENAME, 250);
     parent::_addInteger(self::UPLOADED_AT, 10);
     parent::_addBlob(self::CONTENT);
     parent::_addText(self::DESCRIPTION, false);
 }