if( call.wasNull() )
if( wasNull )
	public error dom_add( String dom, IntHolder dom_id )			throws null_error, db_error, except { try {		dom_id.value = 0;		dom = dom.toLowerCase();		CallableStatement call = con.prepareCall("{? = call dom_add(?)}");		int idx=1;		call.registerOutParameter(idx++, Types.INTEGER);		call.setString(idx++, dom);		call.execute();		dom_id.value = call.getInt(1);		if( call.wasNull() )			return lr(err_code.err_func_res, "DOM_ADD");		if( dom_id.value < 0 ) {			return dom_id.value == -1 ? lr(err_code.err_exists, dom)				: lr(err_code.err_func_res, "DOM_ADD");		}		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);	} }