內有多個左外連接連接

我見從我試圖轉換爲LINQ到SQL語句如下：內有多個左外連接連接

FROM mc.WORKORDER AS wo WITH (NOLOCK) 
INNER JOIN mc.WORKTASK AS wt WITH (NOLOCK) 
ON wo.wordoi = wt.wrkord_oi 
AND wo.tmplt = 0 
AND wo.ci_cnc_date IS NULL 
AND wt.ci_cnc_date IS NULL 
AND wt.clsdt_date >= CAST('1/1/' + CAST(year - 1 AS varchar) AS DateTime) 
AND wt.clsdt_date < DATEADD("mm", 1, CAST(CAST(quarter * 3 AS varchar) + '/1/' + CAST(year AS varchar) AS DateTime)) 
LEFT OUTER JOIN mc.WOLABOR AS wol WITH (NOLOCK) 
ON wt.wtskoi = wol.wt_oi 
LEFT OUTER JOIN mc.CREW AS c WITH (NOLOCK) 
ON wt.crew_oi = c.crewoi 
LEFT OUTER JOIN mc.WORKORDERTYPE AS wot WITH (NOLOCK) 
ON wt.wot_oi = wot.wotyoi 
LEFT OUTER JOIN mc.SEGMENTEDACCOUNT AS sa WITH (NOLOCK) 
ON wt.segacctref_oi = sa.sgaccoi 
LEFT OUTER JOIN mc.SEGVALUE AS sv WITH (NOLOCK) 
ON sa.segval4ref_oi = sv.sgvaloi 
LEFT OUTER JOIN mc.PRIORITY AS p WITH (NOLOCK) 
ON wo.prio_oi = p.priooi 
LEFT OUTER JOIN mc.SITE AS s WITH (NOLOCK) 
ON wo.BEparn_oi = s.siteoi

所以我開始我的翻譯是這樣的：

int year = 2012, quarter = 1; 
string monthYear = "1/1"; 
DateTime closeDate = new DateTime(monthYear, (year-1)); 
DateTime timeframe = new DateTime(year, (quarter * 3), 01).AddMonths(1); 

var allWorkorders = 

(from wo in WORKORDERs 
    join wt in WORKTASKs on wo.Wordoi equals wt.Wrkord_oi && wo.Tmplt equals 0 && wo.Ci_cnc_date == null && wt.ci_cnc_date == null && 
     wt.clsdt_date >= (string)closeDate && wt.clsdt_date < timeframe

現在從這裏我試圖直接進入第一個左外連接。但是，編譯器告訴我在時間結束時需要分號。

我還可以在var allWorkOrders中完成其他連接，還是必須創建一個新連接？

來源

2012-06-08 Programming Newbie

你可能會考慮到這嘗試的實驗[LINQPad（http://www.linqpad.net/）已經不是很有用的工具了。 –

爲什麼麻煩翻譯它呢？將它推入視圖或表值UDF中，並將其顯示爲「IQueryable」以啓用查詢組合。 – bluevector

@達思大陸 - LINQPad是我使用的。 –

您遇到的第一個問題是您如何加入表格。你需要幾條where條款和一個不同的join。此外，作爲查詢的其餘部分，它應該遵循一個類似的模式：如果你的避風港

var allWorkorders = from wo in WORKORDERs 
    where wo.Tmplt == 0 && wo.Ci_cnc_date == null 
    join wt in WORKTASKs 
     on wo.Wordoi equals wt.Wrkord_oi 
    where wt.ci_cnc_date == null 
     && wt.clsdt_date >= (string)closeDate 
     && wt.clsdt_date < timeframe 
    join wol in WOLABOR 
     on wt.wtskoi equals wol.wt_oi into WOLABORGroup 
    join c in CREW 
     on wt.crew_oi equals c.crewoi into CREWGroup 
    // more outer joins here 
    //.... 
    from WOLABORItem in WOLABORGroup.DefaultIfEmpty() 
    from CREWItem in CREWGroup.DefaultIfEmtpy() 
    // more from clauses here 
    //... 
    select new 
    { 
     Something = WOLABORItem != null ? WOLBORItem.something : "none", 
     // more items 
     //..... 
    };

來源

2012-06-09 18:06:14

謝謝你的幫助。 –

內有多個左外連接連接

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