/**
	 * 枚举类型
	 * 用于修改收藏量 添加或者修改
	 * @author zhangfan
	 *
	 */
	public enum Collection {
		
		ADD_COLLECTION ("+"), 
		
		SUBTRACT_COLLECTION ("-");

		private final String value;
		
		Collection (String value) {
			this.value = value;
		}
		
		public String getValue() {
                        return value;
                }
	}



        /**
	 * 修改收藏量 (+/-) 1
	 * @param goodsId
	 * @param collection
	 * @return
	 */
	public boolean updateCollection (String goodsId, Collection collection) {
		return goodsDao.update(Goods.class, 
				Chain.makeSpecial("collection_total", collection.getValue() + 1),
				Cnd.where("id", "=", goodsId));
	}

希望能给你带来灵感
Chain.makeSpecial("collection_total", “+1”)