if( call.wasNull() )
if( wasNull )
	public error user_conf_add( int dom_id, String login, String pfix, 			user_conf_infoHolder ui )			throws null_error, db_error, except { try {		login = login.toLowerCase();		String func = "USER_CONF_ADD";		CallableStatement call = con.prepareCall("{? = call "+func+"(?,?,?,?,?)}");		int idx=1;		call.registerOutParameter(idx++, Types.INTEGER);		call.setInt(idx++, dom_id);		call.setString(idx++, login);		call.setString(idx++, pfix.toLowerCase());		call.setShort(idx++, ui.value.type);		call.setString(idx++, ui.value.val);		call.execute();		ui.value.id_conf = call.getInt(1);		if( call.wasNull() )			return lr(err_code.err_func_res, func);		if( ui.value.id_conf < 0 ) {			switch(ui.value.id_conf) {			case -1:				return lr(err_code.err_noent, Integer.toString(dom_id));			case -2:				return lr(err_code.err_noent, login);			default:				return lr(err_code.err_func_res, func);			}		}		return lr(err_code.err_no, "");	} catch( SQLException e ) {		throw new db_error(e.getMessage(), getClass().getName(), 0);	} catch( NullPointerException e ) {		throw new null_error(e.getMessage(), getClass().getName(), 0);	} catch( Exception e ) {		throw new except(e.getMessage(), getClass().getName(), 0);	} }