Question

我熟悉SQL的工作方式，但使用LINQ to SQL让我很头疼。我有以下查询但我无法将其更改为LINQ to SQL。有人可以帮我解决这个问题，或者解释一下如何解决这个问题吗？

 SELECT
         DISTINCT Pr.Pcode_,
         Pr.Omschrijving,
         Pt.TypeOmschr 
    FROM 
        Projecten AS Pr
    INNER JOIN 
        ProjectTypen AS Pt 
        ON Pr.ProjType_ = Pt.TypeID 
        AND
        Pr.Status NOT IN ( 'Afgerond', 'Afgewezen' ) 
        LEFT OUTER JOIN 
        Personeel AS Pe
        ON Pr.SeniorId_ = Pe.PerId_ 
        OR 
        Pr.CorId_ = Pe.PerId_
        WHERE  
        ( Pe.Naam LIKE '%%' ) 
         OR  
        ( Pr.Omschrijving LIKE '%%' ) 
        OR
        ( Pr.Pcode_ LIKE '%%' ) 
        OR 
       ( Pt.TypeOmschr LIKE '%%' )
        ORDER  BY 
        Pr.Pcode_

修改
我有以下L2S但它不起作用。我收到以下错误：名称'Pe'不在'equals'左侧的范围内。我想问题是左连接，但是解决方案是什么？

    from Pr in _db.Projectens  
    join Pt in _db.ProjectTypens on Pr.ProjType_ equals Pt.TypeID  
    join Pe in _db.Personeels on ((Pr.SeniorId_ == Pe.PerId_) || (Pr.SeniorId_ == Pe.PerId_)) into P  
    where Pr.Pcode_.Contains(search) || Pr.Omschrijving.Contains(search) || Pt.TypeOmschr.Contains(search) || Pe.Naam.Contains(search)  
    select new SearchProjectViewModel {  
        ProjectCode = Pr.Pcode_,  
        ProjectName = Pr.Omschrijving,  
        ProjectType = Pt.TypeOmschr  
    };

Answer 1

我认为

join Pe in _db.Personeels on ((Pr.SeniorId_ == Pe.PerId_) || (Pr.SeniorId_ == Pe.PerId_)) into P

应该是

join Pe in _db.Personeels on ((Pr.SeniorId_ equals Pe.PerId_) || (Pr.SeniorId_ equals Pe.PerId_)) into P

试着让我知道，如果这样的话。

如何在LINQ to SQL中创建这个SQL？

1 个答案: