我似乎无法弄清楚如何正确编写此查询。我尝试了各种组合,但没有任何工作。
以下是我的数据库模型的相关部分:
我需要选择与给定类别和组匹配的产品,并匹配给定的Year,Make,Model,submodel。我在下面做了这个:
ItemList = From P In gDataContext.Products.Include("Groups").Include("Groups.Category1").Include("LookupYearMakeModels") From G In P.Groups Where G.Category = Cat And G.Grp = Group From Y In P.LookupYearMakeModels Where Y.Year = YMM.Year And Y.Make = YMM.Make And Y.Model = YMM.Model And Y.Submodel = YMM.Submodel Select P
我现在还必须选择与Category和Group匹配的产品,但是Universal(Product.Univeral = True)。
我目前正在撰写两个查询,上面的一个和下面的一个。我只是简单地使用ItemList.AddRange(ItemList2)来合并两者的结果
ItemList2 = From P In gDataContext.Products.Include("Groups").Include("Groups.Category1") where P.Universal From G In P.Groups Where G.Category = Cat And G.Grp = Group Select P
但我希望将两个查询合并为一个并避免合并结果。我该怎么办?
感谢您的帮助!
答案 0 :(得分:2)
我试图建立一个类似的模型,我相信这是有效的。在这里,我选择的产品具有与给定类别和组匹配的组,并且具有匹配的年份/品牌/型号/子模型或是通用的。
ItemList = From P In gDataContext.Products.Include("Groups").Include("Groups.Category1").Include("LookupYearMakeModels")
Where P.Groups.Any(Function(G) G.Category = Cat And G.Grp = Group) _
And ( _
P.LookupYearMakeModels.Any(Function(Y) Y.Year = YMM.Year And Y.Make = YMM.Make And Y.Model = YMM.Model And Y.Submodel = YMM.Submodel) _
Or _
P.Universal = True _
)
Select P
HTH
答案 1 :(得分:0)
ItemList = (From P In gDataContext.Products
.Include("Groups.Category1")
.Include("LookupYearMakeModels")
From G In P.Groups
Where G.Category = Cat And G.Grp = Group
From Y In P.LookupYearMakeModels
Where Y.Year = YMM.Year
And Y.Make = YMM.Make And Y.Model = YMM.Model
And Y.Submodel = YMM.Submodel
Select P)
.Union(
From P In gDataContext.Products
.Include("Groups.Category1")
Where P.Universal
From G In P.Groups Where G.Category = Cat And G.Grp = Group
Select P)