亞音速equalent查詢

Question

有人可以給我下面的MySQL查詢的等價查詢：

string qry = "select @rownum := @rownum + 1 AS rowno, b_eventid as EventID,b_eventdata as 
        EventData,b_machinetimestamp as MachineTime,b_hosttimestamp as HostTime"; 
     qry = qry + " from bm_transaction, (select @rownum := 0) r where b_terminalid=" +      
           tid + " order by b_hosttimestamp desc"; 
      MySqlDataAdapter adp = new MySqlDataAdapter(qry, sqlcon); 
      adp.Fill(dtLogs); 

我的亞音速查詢樣本是這樣的：

DataTable dtlogs=new DataTable(); 
    try{ 
     arithmaticdataDB db=new arithmaticdataDB(); 
     IDataReader drreader=db.SelectColumns("b_eventid as EventID,b_eventdata as EventData,b_machinetimestamp as MachineTime,b_hosttimestamp as HostTime") 
           .From(" bm_transaction").Where("b_terminalid").IsEqualTo(tid).OrderDesc("b_hosttimestamp").ExecuteReader(); 

我怎樣才能改變以上相當於我在SubSonic 3.0.0.4中的ADO.NET查詢？ 任何指導是可觀的。

Answer 1

如果我理解正確，第一個查詢是具有值注入和重命名列的原始SQL。第二個示例似乎使用SubSonic 2.x表達式API。

在SubSonic 3中我主要使用ActiveRecord和Linq。您的查詢（非常粗略地）可能看起來像：

var event_rows = b_transaction 
    .Where(x => x.b_terminalid == tid) 
    .OrderByDescending(x => x.hosttimestamp) 
    .ToList();