將SQL轉換爲LINQ

我試圖將SQL查詢轉換爲LINQ查詢。任何幫助，將不勝感激。這裏是我的SQL查詢：將SQL轉換爲LINQ

SELECT DISTINCT 
U.UserID, 
U.LoginID, 
U.FirstName, 
U.LastName, 
U.IsActive, 
U.IsApproved, 
U.Email, 
U.DateLastLogin, 
CONVERT(VARCHAR, U.DateLastLogin, 101) AS LastLogin, 
U.JobTitle, 
U.AgencyName, 
U.WorkPhone, 
U.Fax, 
U.MobilePhone, 
U.Satellite, 
U.Blackberry, 
U.Pager, 
U.Address1, 
U.Address2, 
U.City, 
U.StateAbbr, 
U.ZipCode, 
G.[Name] AS GroupName, 
COALESCE(B.UserID, 0) AS BTC 

FROM dbo.Users U 

INNER JOIN dbo.Users_Grantee UG ON U.UserID = UG.UserID 

INNER JOIN dbo.Users_Groups UGRP ON UG.UserID = UGRP.UserID 
INNER JOIN dbo.Groups G ON UGRP.GroupID = G.GroupID 

--Flag for BTC Users 
LEFT OUTER JOIN (
     SELECT UG2.UserID 
     FROM dbo.Users_Groups UG2 
     INNER JOIN dbo.Groups G2 ON UG2.GroupID = G2.GroupID 
     WHERE G2.GroupClass_ID = 44 
) B ON U.UserID = B.UserID 

WHERE U.IsAdminUser = 0 
AND U.IsActive = @IsActive 
AND UG.GranteeID = @GranteeID 
AND G.GroupClass_ID = 1 --Grantee GroupClass 
AND (U.LastName LIKE @LastName 
    OR U.FirstName LIKE @FirstName 
    OR U.Email  LIKE @Email 
    OR U.LoginID = @LoginID) 


--Exclude PO users who have grantee access. 
AND NOT EXISTS(
    SELECT 1 
    FROM dbo.Users_Groups UG1 
    INNER JOIN dbo.Groups G1 ON UG1.GroupID = G1.GroupID 
    WHERE UG1.UserID = UG.UserID 
    AND G1.GroupClass_ID <> 1 
    AND G1.GroupClass_ID <> 44 
    )

來源

2010-12-13 TimH.

這似乎非常長的時間做一個LINQ查詢，爲什麼這需要在LINQ做了什麼？ – 2010-12-13 20:47:52

我建議把它放在視圖中，但是在LINQ查詢中做WHERE過濾（需要參數的部分）。 – 2010-12-13 20:55:52

也許它很難轉換，因爲它不應該這樣做？尤其是JOIN + DISTINCT – 2010-12-13 22:06:30

不知怎的，我用下面的查詢做到了：

(from u in Users 
    from ugrt in Users_Grantees where (u.UserID == ugrt.UserID) 
    from ugrp in Users_Groups where (ugrt.UserID == ugrp.UserID) 
    from g in Groups where (ugrp.GroupID == g.GroupID) 
    from ug in 
     (from ug2 in Users_Groups 
      join g2 in Groups on ug2.GroupID equals g2.GroupID 
       where (g2.GroupClass_ID == 44) 
      select new {ug2.UserID}).Where(ug=>ug.UserID == u.UserID).DefaultIfEmpty() 
      where 
      u.IsAdminUser == false 
      && u.IsActive == true 
      && ugrt.GranteeID == 1 
      && g.GroupClass_ID == 1 
      orderby u.LastName 
      select u) 
      .Where (t1 => !(from ugrp1 in Users_Groups 
       join g1 in Groups on ugrp1.GroupID equals g1.GroupID 
       where (g1.GroupClass_ID != 1 
        && g1.GroupClass_ID != 44) 
        select new {ugrp1.UserID}) 
        .Any(t2 => t2.UserID == t1.UserID))

來源

2010-12-14 20:04:15

將SQL轉換爲LINQ

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