在达梦管理工具中执行DESC来获取表结构信息，实际是转换成了下面匿名块来插叙相关系统视图获取信息，不是数据库或驱动本身的能力，如需要，可参考如下内容处理。

declare
        _object_id decimal;
        _schema_name varchar := '模式名';
        _table_name varchar := '表名';
begin

select top 1 object_id into _object_id
  from all_objects 
 where owner = _schema_name 
   and object_name = _table_name
   and object_type in ('TABLE', 'VIEW');

select case when "IsPrimaryKey" = 1 then '¡Ì' else null end "PrimaryKey",
       NAME "ColName",
       COL.TYPE$ "TypeName",
       NULLABLE$ "IsNullable",
       DEFVAL "DefaultValue", 
       (select COMMENT$ from SYSCOLUMNCOMMENTS where SCHNAME=_schema_name and TVNAME=_table_name and COLNAME=COL.NAME and TABLE_TYPE='TABLE') "ColDesc" ,
       case when seq = -1 then null else seq end "IndexNo" ,
       sf_get_column_size(type$, cast (length$ as int), cast (scale as int)) "Prec",
       scale "Scale"
  from (select SF_GET_INDEX_KEY_SEQ(INDS.KEYNUM, INDS.KEYINFO, A.COLID) SEQ,
               SF_COL_IS_IDX_KEY(INDS.KEYNUM, INDS.KEYINFO, A.COLID) "IsPrimaryKey",
               A.name,
               A.id,
               A.colid,
               CASE WHEN B.INFO1 IS NULL OR (((B.INFO1>>2) & 0x01)=0 AND ((B.INFO1>>3) & 0x01)=0) THEN A.TYPE$ 
                    WHEN (B.INFO2 & 0xFF) = 0 THEN 'NUMBER' 
                    WHEN ((B.INFO1>>3) & 0x01)=1 THEN 'DATE' 
                    ELSE 'FLOAT' 
                    END AS TYPE$,
               CASE WHEN B.INFO1 IS NULL OR ((B.INFO1>>2) & 0x01)=0 THEN A.SCALE 
                    WHEN (B.INFO2 & 0xFF) = 0 THEN 0 
                    ELSE 129 
                    END AS SCALE,
               CASE WHEN B.INFO1 IS NULL OR ((B.INFO1>>2) & 0x01)=0 THEN A.LENGTH$ 
                    ELSE (B.INFO2 & 0xFF) 
                    END AS LENGTH$,
               A.NULLABLE$,
               A.DEFVAL,
               A.INFO1,
               A.INFO2
            from SYSCOLUMNS A
       left join SYSCOLINFOS B 
                 on A.ID=B.ID and A.COLID=B.COLID
       left join SYSCONS CONS 
                 on CONS.TABLEID = A.ID and CONS.TYPE$ = 'P' and CONS.VALID = 'Y'
       left join SYSINDEXES INDS 
                 on INDS.ID = CONS.INDEXID and SF_COL_IS_IDX_KEY(INDS.KEYNUM, INDS.KEYINFO, A.COLID) = 1
           where A.ID =_object_id) COL;
end;