返回某个数据表的结构信息(master数据库)

/// <summary>
  /// 返回某个数据表的结构信息(master数据库)
  /// </summary>
  /// <param name="tableName">表名</param>
  /// <returns>表的结构信息</returns>
  public static DataTable GetTableInfo(string tableName)
  {
   string sql1=String.Format("EXEC sp_columns @table_name='{0}'",tableName);
   string sql2=String.Format("exec sp_pkeys @table_name='{0}'",tableName);
   DataTable table1=ExecuteDataTable(CommandType.Text,sql1);
   DataTable table2=ExecuteDataTable(CommandType.Text,sql2);
   
   table1.Columns.Add("IsPK");
   if(table2!=null && table2.Rows.Count>0)
   {
    foreach(DataRow row in table1.Rows)
    {
     string name=row["COLUMN_NAME"].ToString();
      
     DataRow[] selrow=table2.Select("COLUMN_NAME='"+name+"'");
     if(selrow.Length>0)
     {
      row["IsPK"]=1;
     }
     else
      row["IsPK"]=0;
     
    }
   }
   else
    foreach(DataRow row in table1.Rows)
    {
     string name=row["COLUMN_NAME"].ToString();
     row["IsPK"]=0;
     
    }
   table1.AcceptChanges();
   return table1;
        #region 另一个查询语句(good)
//SELECT
// 表名=case when a.colorder=1 then d.name else '' end,
// 字段序号=a.colorder,
// 字段名=a.name,
// 标识=case when COLUMNPROPERTY( a.id,a.name,'IsIdentity')=1 then '√'else '' end,
// 主键=case when exists(SELECT 1 FROM sysobjects where xtype='PK' and name in (
//  SELECT name FROM sysindexes WHERE indid in(
//   SELECT indid FROM sysindexkeys WHERE id = a.id AND colid=a.colid
//  ))) then '√' else '' end,
// 类型=b.name,
// 占用字节数=a.length,
// 长度=COLUMNPROPERTY(a.id,a.name,'PRECISION'),
// 小数位数=isnull(COLUMNPROPERTY(a.id,a.name,'Scale'),0),
// 允许空=case when a.isnullable=1 then '√'else '' end,
// 默认值=isnull(e.text,''),
// 字段说明=isnull(g.[value],'')
//FROM syscolumns a
// left join systypes b on a.xtype=b.xusertype
// inner join sysobjects d on a.id=d.id  and d.xtype='U' and  d.name<>'dtproperties'
// left join syscomments e on a.cdefault=e.id
// left join sysproperties g on a.id=g.id and a.colid=g.smallid 
//order by a.id,a.colorder

         #endregion
  }