[英]Linq to Entity Join table with multiple OR conditions
我需要編寫一個可以獲得以下SQL查詢的Linq-Entity狀態
SELECT RR.OrderId
FROM dbo.TableOne RR
JOIN dbo.TableTwo M ON RR.OrderedProductId = M.ProductID OR RR.SoldProductId= M.ProductID
WHERE RR.StatusID IN ( 1, 4, 5, 6, 7 )
我堅持使用以下語法
int[] statusIds = new int[] { 1, 4, 5, 6, 7 };
using (Entities context = new Entities())
{
var query = (from RR in context.TableOne
join M in context.TableTwo on new { RR.OrderedProductId, RR.SoldProductId} equals new { M.ProductID }
where RR.CustomerID == CustomerID
&& statusIds.Any(x => x.Equals(RR.StatusID.Value))
select RR.OrderId).ToArray();
}
這給了我以下錯誤
錯誤50 join子句中某個表達式的類型不正確。 調用“加入”時類型推斷失敗。
如何為表執行多條件連接。
您不必使用連接語法。 在where
子句中添加謂詞具有相同的效果,您可以添加更多條件:
var query = (from RR in context.TableOne
from M in context.TableTwo
where RR.OrderedProductId == M.ProductID
|| RR.SoldProductId == M.ProductID // Your join
where RR.CustomerID == CustomerID
&& statusIds.Any(x => x.Equals(RR.StatusID.Value))
select RR.OrderId).ToArray();
將查詢語法從使用join
更改為使用其他from
子句
var query = (from RR in context.TableOne
from M in context.TableTwo.Where(x => x.ProductID == RR.OrderedProductId || x.ProductID == RR.SoldProductId)
where statusIds.Any(x => x.Equals(RR.StatusID.Value))
select RR.OrderId).ToArray();
多個聯接:
var query = (from RR in context.TableOne
join M in context.TableTwo on new { oId = RR.OrderedProductId, sId = RR.SoldProductId} equals new { oId = M.ProductID, sId = M.ProductID }
where RR.CustomerID == CustomerID
&& statusIds.Any(x => x.Equals(RR.StatusID.Value))
select RR.OrderId).ToArray();
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