Linq to實體查詢優化

Question

我有一個LINQ查詢，它將根據是否滿足一些條件來選擇票證。 該查詢本身運行良好且可以正常運行，但是我擔心隨着可能的返回值數量的增加，它會變得更糟。

誰能提出改進或優化此查詢以使其運行更快/更好的方法嗎？ 我在違反標准做法時做錯了什么嗎？

這是查詢。 我換了一些名字。 我想的是， select的在select new語句是一個問題為好。

var attentionObj = (from c in context.SupportTicketEntities
                    where
                    c.StatusID != 3 && 
                    ((c.IsAllocated == false)    // not allocated
                    || (c.FlaggedForAssist == true && c.AllocatedToEmployeeID == empId)     // is flagged for assist
                    || ((from d in c.SupportTicketDatas
                         where c.AllocatedToEmployeeID == empId
                         && c.FogBugzAttachments.Count == 0
                         orderby d.TimeStamp descending
                         select d.TimeStamp).FirstOrDefault() < warningDt)   // ticket not replied to
                    || ((from e in c.SupportTicketDatas
                         where c.AllocatedToEmployeeID == empId
                         orderby e.TimeStamp descending
                         select e).FirstOrDefault().RaisedByUser == true)   // customer has replied
                    || (c.IsEscalated == true))  // ticket escalated
                    select new
                    {
                        RefID = c.RefID,
                        TicketID = c.SupportTicketID,
                        ClientCompany = c.ClientData.Company,
                        IsAllocated = c.IsAllocated,
                        DateLogged = c.DateLogged,
                        IsFlagged = c.FlaggedForAssist,
                        NeedsReply = (from d in c.SupportTicketDatas
                                      orderby d.TimeStamp descending
                                      select d.TimeStamp).FirstOrDefault() < warningDt,
                        CustReply = (from e in c.SupportTicketDatas
                                     orderby e.TimeStamp descending
                                     select e).FirstOrDefault().RaisedByUser == true,
                        IsEscalated = c.IsEscalated
                    }).ToArray();

編輯：所以我創建了一個存儲過程，盡管我不是SQL方面的佼佼者。 這個可以嗎？

@empId int,
@warningDt datetime
AS
SELECT * FROM SupportTickets
WHERE StatusID != 3
AND IsAllocated = 0
UNION
SELECT * FROM SupportTickets
WHERE StatusID != 3
AND FlaggedForAssist = 1
AND AllocatedToEmployeeID = @empId
UNION
SELECT * FROM SupportTickets
WHERE StatusID != 3
AND AllocatedToEmployeeID = @empId
AND NOT EXISTS (SELECT FogBugzLinkID FROM FogBugzAttachment)
AND (SELECT MAX(TimeStamp) 
 FROM SupportTicketData
 WHERE SupportTickets.SupportTicketID = SupportTicketData.SupportTicketID) < @warningDt
UNION
SELECT SupportTickets.* FROM SupportTickets
JOIN SupportTicketData ON SupportTickets.SupportTicketID = SupportTicketData.SupportTicketID
WHERE SupportTickets.StatusID != 3
AND SupportTickets.AllocatedToEmployeeID = @empId
AND SupportTicketData.TimeStamp = (SELECT MAX(TimeStamp) FROM SupportTicketData
                   WHERE SupportTickets.SupportTicketID = SupportTicketData.SupportTicketID)
AND SupportTicketData.RaisedByUser = 1
UNION
SELECT * FROM SupportTickets
WHERE StatusID != 3
AND SupportTickets.IsEscalated = 1

Answer 1

因此，似乎在我的初始語句中使用類似於存儲過程的存儲過程比使用丑陋的LINQ OR語句要有效得多。

我將其標記為答案，以便將其關閉。 看看我對SPROC的原始疑問。