Question

我想将以下SQL查询转换为LINQ

SELECT a.* 
FROM   campaign_newslettersubscriber_track a 
       INNER JOIN (SELECT DISTINCT campaignid, 
                                   Min(id) AS id 
                   FROM   campaign_newslettersubscriber_track 
                   GROUP  BY campaignid) AS b 
               ON a.campaignid = b.campaignid 
                  AND a.id = b.id

Answer 1

 var subquery = from c in objectContext.campaign_newslettersubscriber_track 
                         group c by c.campaignid into g
                         select new
                         {
                             id = g.Min(x => x.campaignid),
                             campaignId = g.Key
                         };

var n = from c in objectContext.campaign_newslettersubscriber_track 
        join cin in subquery.Distinct() on c.campaignid equals cin.campaignId
        select c;

Answer 2

我会研究名为Linqer的工具。

可以使用T-SQL并将其转换为LINQ，LINQ to SQL（使用SqlMetal）或LINQ to Entities（使用EdmGen）。

请注意，这不是一个免费工具（一个许可证为60.00美元，在撰写本文时更便宜，并且不会转换所有T-SQL函数），这里是受支持的functions列表

查询从sql转换为linq

2 个答案: