的LINQ to SQL查詢

我有一個SQL查詢，如下所示：的LINQ to SQL查詢

Declare @DivisionNo INT 

    SET @DivisionNo = 5117 



    SELECT distinct CASE WHEN ISNULL([DivisionNo],'') <> @DivisionNo 
         THEN @DivisionNo ELSE [DivisionNo] END as DivisionNo 

     --,[RecordID]  
     ,[AcctCat]  
     ,[AcctCatDesc]  
     ,[CostCode]  
     ,[CostCodeDesc] 

    FROM [dbo].[vw_eSchdl_AcctCat_CostCode]  
    WHERE DivisionNo = @DivisionNo 

    UNION 

    SELECT distinct CASE WHEN ISNULL([DivisionNo],'') <> @DivisionNo 
         THEN @DivisionNo ELSE [DivisionNo] END as DivisionNo 

     --,[RecordID]  
     ,[AcctCat]  
     ,[AcctCatDesc]  
     ,[CostCode]  
     ,[CostCodeDesc] 

    FROM [dbo].[vw_eSchdl_AcctCat_CostCode]  
    WHERE AcctCat not in (
     SELECT [AcctCat]  
     FROM [dbo].[vw_eSchdl_AcctCat_CostCode] 
     WHERE DivisionNo = @DivisionNo 
)

使用LINQ to SQL的它怎麼能我重複？

感謝

來源

2010-04-14 Mohit

你嘗試過什麼？你可以得到一部分，但卡住某處？你可以發佈你有什麼？哪一位給你帶來問題？或者你不知道從哪裏開始？ – 2010-04-14 18:24:15

如果你有一點時間，沒有更好的學習方法，比使用linqpad自己做。您可以使用SQL打開的選項卡和使用LINQ的選項卡，並嘗試複製您的查詢結果。

來源

2010-04-14 18:44:32

您可以從SQL轉換使用的LINQ到Linqer。您可以從here下載。

來源

2010-04-14 18:23:06

@Mark - LinqPad不會將SQL轉換爲Linq。不過，一款名叫Linqer的產品會。 – 2010-04-14 18:27:30

@Randy：哎呀！修正了，謝謝。 – 2010-04-14 18:28:46

功能等同性如何？

int divisionNo = 5117; 

var matches = from ac in context.AcctCatCostCodes 
       where ac.DivisionNo == divisionNo 
       select ac; 

var missingAcctCat = from ac in matches 
        select ac.AcctCat; 

var others = from ac in context.AcctCatCostCodes 
      where !missingAcctCat.Contains(ac.AcctCat) 
      select ac; 

var union = from ac in matches.Union(others) 
      select new 
      { 
       DivisionNo = ac.DivisionNo ?? divisionNo, 
       ac.AcctCat, 
       ac.AcctCatDesc, 
       ac.CostCode, 
       ac.CostCodeDesc 
      };

...相同的方法，而不是查詢語法...

var matches = context.AcctCatCostCodes 
        .Where(ac => ac.DivisionNo == divisionNo); 

var missingAcctCat = matches.Select(ac => ac.AcctCat); 

var others = context.AcctCatCostCodes 
        .Where(ac => !missingAcctCat.Contains(ac.AcctCat)); 

var union = matches.Union(others).Select(ac => 
      new 
      { 
       DivisionNo = ac.DivisionNo ?? divisionNo, 
       ac.AcctCat, 
       ac.AcctCatDesc, 
       ac.CostCode, 
       ac.CostCodeDesc 
      });

...通過LINQ2SQL生成的SQL ...

SELECT COALESCE([t4].[DivisionNo],@p2) AS [DivisionNo], 
     [t4].[AcctCat], 
     [t4].[AcctCatDesc], 
     [t4].[CostCode], 
     [t4].[CostCodeDesc] 
FROM (
    SELECT [t3].[AcctCat], [t3].[AcctCatDesc], [t3].[CostCode], 
      [t3].[CostCodeDesc], [t3].[DivisionNo] 
    FROM (
     SELECT [t0].[RecordID], [t0].[AcctCat], [t0].[AcctCatDesc], 
       [t0].[CostCode], [t0].[CostCodeDesc], [t0].[DivisionNo] 
     FROM [AcctCatCostCode] AS [t0] 
     WHERE [t0].[DivisionNo] = @p0 
     UNION 
     SELECT [t1].[RecordID], [t1].[AcctCat], [t1].[AcctCatDesc], 
       [t1].[CostCode], [t1].[CostCodeDesc], [t1].[DivisionNo] 
     FROM [AcctCatCostCode] AS [t1] 
     WHERE NOT (EXISTS(
      SELECT NULL AS [EMPTY] 
      FROM [AcctCatCostCode] AS [t2] 
      WHERE ([t2].[AcctCat] = [t1].[AcctCat]) 
        AND ([t2].[DivisionNo] = (@p1)) 
      )) 
     ) AS [t3] 
    ) AS [t4]

來源

2010-04-14 18:49:51

的LINQ to SQL查詢

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