public String[] getCarnumberByUID(Statement statement,String UID)//根据用户ID获取车牌号
	{
		int i = 0;
		String[] result = new String[20];
		sql = "select carnumber from CarNumber where UID = '" + UID +"'";
		try 
		{
			ResultSet rs = statement.executeQuery(sql);
			while (rs.next()) {
				result[i] = rs.getString("carnumber");
				i++;
			}
		} 
		catch (SQLException e) 
		{
			System.out.println("Error! (from src/Fetch/CarNumber.getCarnumberByUID())");
			// TODO Auto-generated catch block
			e.printStackTrace();
		}
		return result;
	}