if( call.wasNull() )
if( wasNull )
	protected error da_dip_add( int dom_id, String rea, String func )			throws null_error, db_error, except { try {		CallableStatement call = con.prepareCall("{ ? = call "+func+"(?, ?) }");				int idx=1;		call.registerOutParameter(idx++, Types.INTEGER);		call.setInt(idx++, dom_id);		call.setString(idx++, rea);		call.execute();		int res = call.getInt(1);		if( call.wasNull() )			return lr(err_code.err_func_res, func);		if( res < 0 ) {			return res == -1 				? lr(err_code.err_exists, Integer.toString(dom_id)) 				: 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);	} }