我正在使用EF4将DB模式映射到对象模型;我最初从数据库中生成EDMX,但是直接编辑XML(试图在改变CSDL/MSL以使其近似于我想要的对象模型时保持SSDL相同)。该数据库包含,在许多其他事情,通过外键(0 ..)1对多的约束,像这样一对夫妇表:实体框架:0..1对多外键约束不被识别?
go
create table Options (
KitNodeID int primary key foreign key references KitNodes (KitNodeID),
[SKUID] int null foreign key (SKUID) references SKUs (SKUID)
)
go
create table Upgrades (
UpgradeID int identity (1, 1) primary key not null,
[Name] nvarchar(50) not null,
DefaultOptionID int null references Options (KitNodeID)
)
在EDMX的有关章节是这样的:
[...]
<!-- SSDL content -->
<edmx:StorageModels>
<Schema Namespace="DModel.Store" Alias="Self" Provider="System.Data.SqlClient" ProviderManifestToken="2005" xmlns:store="http://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGenerator" xmlns="http://schemas.microsoft.com/ado/2009/02/edm/ssdl">
<EntityContainer Name="DModelStoreContainer">
<AssociationSet Name="FK__Upgrades__Defaul__70DDC3D8" Association="DModel.Store.FK__Upgrades__Defaul__70DDC3D8">
<End Role="Options" EntitySet="Options" />
<End Role="Upgrades" EntitySet="Upgrades" />
</AssociationSet>
</EntityContainer>
<EntityType Name="Upgrades">
<Key>
<PropertyRef Name="UpgradeID" />
</Key>
<Property Name="UpgradeID" Type="int" Nullable="false" StoreGeneratedPattern="Identity" />
<Property Name="Name" Type="nvarchar" Nullable="false" MaxLength="50" />
<Property Name="DefaultOptionID" Type="int" />
</EntityType>
<Association Name="FK__Upgrades__Defaul__70DDC3D8">
<End Role="Options" Type="DModel.Store.Options" Multiplicity="0..1" />
<End Role="Upgrades" Type="DModel.Store.Upgrades" Multiplicity="*" />
<ReferentialConstraint>
<Principal Role="Options">
<PropertyRef Name="KitNodeID" />
</Principal>
<Dependent Role="Upgrades">
<PropertyRef Name="DefaultOptionID" />
</Dependent>
</ReferentialConstraint>
</Association>
</Schema></edmx:StorageModels>
<!-- CSDL content -->
<edmx:ConceptualModels>
<Schema Namespace="DModel" Alias="Self" xmlns:annotation="http://schemas.microsoft.com/ado/2009/02/edm/annotation" xmlns="http://schemas.microsoft.com/ado/2008/09/edm">
<EntityContainer Name="DEntities" annotation:LazyLoadingEnabled="true">
<EntitySet Name="Upgrades" EntityType="DModel.Upgrade" />
<AssociationSet Name="Upgrade_DefaultOption" Association="DModel.Upgrade_DefaultOption">
<End Role="Options" EntitySet="Options" />
<End Role="Upgrades" EntitySet="Upgrades" />
</AssociationSet>
</EntityContainer>
<Association Name="Upgrade_DefaultOption">
<End Role="Options" Type="DModel.Option" Multiplicity="0..1" />
<End Role="Upgrades" Type="DModel.Upgrade" Multiplicity="*" />
</Association>
<EntityType Name="Upgrade">
<Key>
<PropertyRef Name="UpgradeID" />
</Key>
<Property Name="UpgradeID" Nullable="false" annotation:StoreGeneratedPattern="Identity" Type="Int32" />
<Property Name="Name" Type="String" Nullable="false" MaxLength="50" Unicode="true" FixedLength="false" />
<NavigationProperty Name="DefaultOption" Relationship="DModel.Upgrade_DefaultOption" FromRole="Upgrades" ToRole="Options" />
<NavigationProperty Name="OptInOptions" Relationship="DModel.OptInOptions" FromRole="Upgrades" ToRole="Options" />
</EntityType>
</Schema>
</edmx:ConceptualModels>
<!-- C-S mapping content -->
<edmx:Mappings>
<Mapping Space="C-S" xmlns="http://schemas.microsoft.com/ado/2008/09/mapping/cs">
<EntityContainerMapping StorageEntityContainer="DModelStoreContainer" CdmEntityContainer="DEntities">
<EntitySetMapping Name="Upgrades"><EntityTypeMapping TypeName="DModel.Upgrade"><MappingFragment StoreEntitySet="Upgrades">
<ScalarProperty Name="UpgradeID" ColumnName="UpgradeID" />
<ScalarProperty Name="Name" ColumnName="Name" />
</MappingFragment></EntityTypeMapping></EntitySetMapping>
<AssociationSetMapping Name="Upgrade_DefaultOption" TypeName="DModel.Upgrade_DefaultOption" StoreEntitySet="FK__Upgrades__Defaul__70DDC3D8">
<EndProperty Name="Upgrades">
<ScalarProperty Name="UpgradeID" ColumnName="UpgradeID"/>
</EndProperty>
<EndProperty Name="Options">
<ScalarProperty Name="KitNodeID" ColumnName="DefaultOptionID"/>
</EndProperty>
</AssociationSetMapping>
</EntityContainerMapping>
</Mapping>
</edmx:Mappings>
它会生成代码,但是当我尝试使用它,我得到一个“错误2007:表‘FK_ 升级 _Defaul__70DDC3D8’指定为该MSL的一部分不存在于MetadataWorkspace中。“看起来它无法找到SSDL应该使用的底层外键约束,但我确实在数据库中看到一个具有该名称的外键约束。
真的,我觉得我对这种映射应该如何工作一般没有很好的理解 - 数据库中的外键约束真的被视为“关联集”? - 但这是我能解决的最接近的问题。我不知道是否有人能够根据我提供的信息诊断问题,但是有关哪里的指示?我尝试了各种方法,例如将StoreEntitySet更改为指向选项等,但它们只是导致不同的错误。
如果清理解决方案并更新edmx文件会发生什么情况? – CarneyCode 2011-02-23 19:30:36