public void saveRanking(String player){
		if( player == null || player.equals(""))
			player = "无名";

		int score = Game.enemy_killed * 100 + Game.propScore ;
		PreparedStatement pstmt = null ;
		try{
			pstmt = ConnectionUtil.getInstance().prepareStatement(""
					+ "insert into t_ranking(id, player, score, stage, time) values(id_creator.nextval,?,?,?,?)");
			pstmt.setString(1, player);
			pstmt.setInt(2, score);
			pstmt.setInt(3, Game.stage);
			pstmt.setDate(4, new java.sql.Date (new java.util.Date().getTime()));
			
			pstmt.execute();
		}catch(Exception e){
			e.printStackTrace();
		}finally{
			if( pstmt != null)
				try {
					pstmt.close();
				} catch (SQLException e) {
					e.printStackTrace();
				}
		}
	}