如何爲以下SQL編寫實體框架4查詢？

Question

我的應用程序中有一個實體框架4模型。我需要它來生成的SQL語句：

SELECT * 
FROM  Reads   AS R 
INNER JOIN Images   AS I ON R.ReadId = I.ReadId AND I.ImageTypeId = 2 
LEFT OUTER JOIN Alarms  AS A ON R.ReadId = A.ReadId AND A.DomainId IN (103,102,101,2,1,12) AND A.i_active = 1 
LEFT OUTER JOIN ListDetails AS L ON L.ListDetailId = A.ListDetailId 
WHERE R.i_active = 1 

這是我現在有這個查詢在我的代碼：

var items = from read in query 
      join plate in context.Images  on read.ReadId  equals plate.ReadId 
      join temp1 in context.Alarms  on read.ReadId  equals temp1.ReadId  into alarms from alarm in alarms.DefaultIfEmpty() 
      join temp2 in context.ListDetails on alarm.ListDetailId equals temp2.ListDetailId into entries from entry in entries.DefaultIfEmpty() 
      where plate.ImageTypeId == 2 && plate.IActive == 1 
      select new { read, plate, alarm, entry.OfficerNotes }; 

如何修改實體框架查詢來獲取SQL查詢，我需要？

Answer 1

對於左連接 - 我建議使用帶有where代替join一個from，我覺得它使清潔

對於內部有多個加盟加盟條件 - 你需要加入兩個匹配的匿名類型，或使用一個from與where條件

對於X IN列表，你需要指定列表中的查詢外，使用Any方法或Contains方法

List<int> domainIds = new List<int>() { 103,102,101,2,1,12 }; 

    var items = from read in query 
       join plate in context.Images 
       on new { read.ReadId, ImageTypeId = 2 } equals new { plate.ReadId, plate.ImageTypeId } 
       from alarm in context.Alarms 
            .Where(x => x.IActive == 1) 
            .Where(x => domainIds.Any(y => y == x.DomainId)) 
            .Where(x => read.ReadId == x.ReadId) 
            .DefaultIfEmpty() 
       from entry in context.ListDetails 
            .Where(x => alarm.ListDetailId == x.ListDetailId) 
            .DefaultIfEmpty() 
       select new { read, plate, alarm, entry.OfficerNotes };