private IQueryable GetArticleQueryByColumnID(long columnID)

        {

            string sqlStr = "";

            if (columnID > 0)

            {

                sqlStr = string.Format(ExSql, string.Format(" and COLUMN_ID={0} ", columnID));

            }

            else

            {

                sqlStr = string.Format(ExSql, "");

            }

            switch (GetColumn(columnID).REFER_TYPE)

            {

                case 0:

                    return _db.ExecuteQuery<V_ARTICLE_SHOW_ALL>(sqlStr).AsQueryable();

                case 1:

                    return _db.ExecuteQuery<V_ARTICLE_SHOW_REFER>(sqlStr).AsQueryable();

                case 2:

                    return _db.ExecuteQuery<V_ARTICLE_SHOW_REFER>(sqlStr).AsQueryable();

                case 3:

                    return _db.ExecuteQuery<V_ARTICLE_SHOW_DUTYTREE>(sqlStr).AsQueryable();

                default:

                    return _db.ExecuteQuery<V_ARTICLE_SHOW_REFER_ALL>(sqlStr).AsQueryable();

            }