Entity framework EF4:映射到一个;“额外字段”;桌子
我有两张桌子: 票Entity framework EF4:映射到一个;“额外字段”;桌子,entity-framework,entity-framework-4,Entity Framework,Entity Framework 4,我有两张桌子: 票 GUID(主键) 还有其他与此问题无关的专栏 票务处 GUID(部分PK,FK到票证.GUID) 字段名(部分主键) 字段值 如果我有这些机票记录: {GUID=“我的票”} {GUID=“my_ticket_2”} 然后我可能会有一些票证属性记录,比如: {GUID=“my_ticket”,FIELDNAME=“FieldA”,FIELDVALUE=“value a”} {GUID=“我的票”,FIELDNAME=“FieldB”,FIELDVALUE=“fo
- GUID(主键)
- 还有其他与此问题无关的专栏
- GUID(部分PK,FK到票证.GUID)
- 字段名(部分主键)
- 字段值
- {GUID=“我的票”}
- {GUID=“my_ticket_2”}
- {GUID=“my_ticket”,FIELDNAME=“FieldA”,FIELDVALUE=“value a”}
- {GUID=“我的票”,FIELDNAME=“FieldB”,FIELDVALUE=“foo”}
- {GUID=“我的票”,FIELDNAME=“FieldC”,FIELDVALUE=“bar”}
- {GUID=“my_ticket_2”,FIELDNAME=“FieldC”,FIELDVALUE=“blah”}
- {GUID=“my_ticket_2”,FIELDNAME=“FieldD”,FIELDVALUE=“data”}
MINE_EF_TestContext ctx = new MINE_EF_TestContext();
var someTickets = ctx.TICKET.Where(t => t.FieldA == "value a");
我想能够添加多个这样的属性。例如,我可能也想添加一个FieldB属性
我的EDMX:
<edmx:Edmx Version="2.0" xmlns:edmx="http://schemas.microsoft.com/ado/2008/10/edmx">
<edmx:Runtime>
<edmx:StorageModels>
<Schema Namespace="MINE_EF_Test.Store" Alias="Self" Provider="EFOracleProvider" ProviderManifestToken="11g" xmlns:store="http://schemas.microsoft.com/ado/2007/12/edm/EntityStoreSchemaGenerator" xmlns="http://schemas.microsoft.com/ado/2009/02/edm/ssdl">
<EntityContainer Name="MINE_EF_TestStoreContainer">
<EntitySet Name="TICKET" EntityType="MINE_EF_Test.Store.TICKET" store:Type="Tables" />
<EntitySet Name="TICKET_PROPERTIES" EntityType="MINE_EF_Test.Store.TICKET_PROPERTIES" store:Type="Tables" />
<AssociationSet Name="TICKET_PROPERTIES_TICKET_FK" Association="MINE_EF_Test.Store.TICKET_PROPERTIES_TICKET_FK">
<End Role="TICKET" EntitySet="TICKET" />
<End Role="TICKET_PROPERTIES" EntitySet="TICKET_PROPERTIES" />
</AssociationSet>
</EntityContainer>
<EntityType Name="TICKET">
<Key>
<PropertyRef Name="GUID" />
</Key>
<Property Name="GUID" Type="varchar2" Nullable="false" MaxLength="36" />
</EntityType>
<EntityType Name="TICKET_PROPERTIES">
<Key>
<PropertyRef Name="FIELDNAME" />
<PropertyRef Name="GUID" />
</Key>
<Property Name="FIELDNAME" Type="varchar2" Nullable="false" MaxLength="40" />
<Property Name="FIELDVALUE" Type="varchar2" Nullable="false" MaxLength="1000" />
<Property Name="GUID" Type="varchar2" Nullable="false" MaxLength="36" />
</EntityType>
<Association Name="TICKET_PROPERTIES_TICKET_FK">
<End Role="TICKET" Type="MINE_EF_Test.Store.TICKET" Multiplicity="1" />
<End Role="TICKET_PROPERTIES" Type="MINE_EF_Test.Store.TICKET_PROPERTIES" Multiplicity="*" />
<ReferentialConstraint>
<Principal Role="TICKET">
<PropertyRef Name="GUID" />
</Principal>
<Dependent Role="TICKET_PROPERTIES">
<PropertyRef Name="GUID" />
</Dependent>
</ReferentialConstraint>
</Association>
<Association Name="TICKET_PROPERTIES_TICKET_FK_POC">
<End Role="TICKET" Type="MINE_EF_Test.Store.TICKET" Multiplicity="0..1" />
<End Role="TICKET_PROPERTIES" Type="MINE_EF_Test.Store.TICKET_PROPERTIES" Multiplicity="1" />
<ReferentialConstraint>
<Principal Role="TICKET_PROPERTIES">
<PropertyRef Name="GUID" />
</Principal>
<Dependent Role="TICKET">
<PropertyRef Name="GUID" />
</Dependent>
</ReferentialConstraint>
</Association>
</Schema>
</edmx:StorageModels>
<edmx:ConceptualModels>
<Schema Namespace="MINE_EF_Test" Alias="Self" xmlns:annotation="http://schemas.microsoft.com/ado/2009/02/edm/annotation" xmlns="http://schemas.microsoft.com/ado/2008/09/edm">
<EntityContainer Name="MINE_EF_TestContext" annotation:LazyLoadingEnabled="true">
<EntitySet Name="TICKET" EntityType="MINE_EF_Test.TICKET" />
<EntitySet Name="TICKET_PROPERTIES" EntityType="MINE_EF_Test.TICKET_PROPERTIES" />
<AssociationSet Name="TICKET_PROPERTIES_TICKET_FK" Association="MINE_EF_Test.TICKET_PROPERTIES_TICKET_FK">
<End Role="TICKET" EntitySet="TICKET" />
<End Role="TICKET_PROPERTIES" EntitySet="TICKET_PROPERTIES" />
</AssociationSet>
</EntityContainer>
<EntityType Name="TICKET">
<Key>
<PropertyRef Name="GUID" />
</Key>
<Property Name="GUID" Type="String" Nullable="false" MaxLength="36" Unicode="false" FixedLength="false" />
<NavigationProperty Name="TICKET_PROPERTIES" Relationship="MINE_EF_Test.TICKET_PROPERTIES_TICKET_FK" FromRole="TICKET" ToRole="TICKET_PROPERTIES" />
</EntityType>
<EntityType Name="TICKET_PROPERTIES">
<Key>
<PropertyRef Name="FIELDNAME" />
<PropertyRef Name="GUID" />
</Key>
<Property Name="FIELDNAME" Type="String" Nullable="false" MaxLength="40" Unicode="false" FixedLength="false" />
<Property Name="FIELDVALUE" Type="String" Nullable="false" MaxLength="1000" Unicode="false" FixedLength="false" />
<Property Name="GUID" Type="String" Nullable="false" MaxLength="36" Unicode="false" FixedLength="false" />
<NavigationProperty Name="TICKET" Relationship="MINE_EF_Test.TICKET_PROPERTIES_TICKET_FK" FromRole="TICKET_PROPERTIES" ToRole="TICKET" />
</EntityType>
<Association Name="TICKET_PROPERTIES_TICKET_FK">
<End Role="TICKET" Type="MINE_EF_Test.TICKET" Multiplicity="1" />
<End Role="TICKET_PROPERTIES" Type="MINE_EF_Test.TICKET_PROPERTIES" Multiplicity="*" />
<ReferentialConstraint>
<Principal Role="TICKET">
<PropertyRef Name="GUID" />
</Principal>
<Dependent Role="TICKET_PROPERTIES">
<PropertyRef Name="GUID" />
</Dependent>
</ReferentialConstraint>
</Association>
</Schema>
</edmx:ConceptualModels>
<edmx:Mappings>
<Mapping Space="C-S" xmlns="http://schemas.microsoft.com/ado/2008/09/mapping/cs">
<EntityContainerMapping StorageEntityContainer="MINE_EF_TestStoreContainer" CdmEntityContainer="MINE_EF_TestContext">
<EntitySetMapping Name="TICKET">
<EntityTypeMapping TypeName="MINE_EF_Test.TICKET">
<MappingFragment StoreEntitySet="TICKET">
<ScalarProperty Name="GUID" ColumnName="GUID" />
</MappingFragment>
</EntityTypeMapping>
</EntitySetMapping>
<EntitySetMapping Name="TICKET_PROPERTIES">
<EntityTypeMapping TypeName="MINE_EF_Test.TICKET_PROPERTIES">
<MappingFragment StoreEntitySet="TICKET_PROPERTIES">
<ScalarProperty Name="FIELDNAME" ColumnName="FIELDNAME" />
<ScalarProperty Name="FIELDVALUE" ColumnName="FIELDVALUE" />
<ScalarProperty Name="GUID" ColumnName="GUID" />
</MappingFragment>
</EntityTypeMapping>
</EntitySetMapping>
</EntityContainerMapping>
</Mapping>
</edmx:Mappings>
</edmx:Runtime>
<edmx:Designer xmlns="http://schemas.microsoft.com/ado/2008/10/edmx">
<Connection><DesignerInfoPropertySet><DesignerProperty Name="MetadataArtifactProcessing" Value="EmbedInOutputAssembly" /></DesignerInfoPropertySet></Connection>
<edmx:Options />
<edmx:Diagrams >
<Diagram Name="MINE_EF_Test" ZoomLevel="96">
<EntityTypeShape EntityType="MINE_EF_Test.TICKET" Width="1.5" PointX="0.75" PointY="1.125" Height="1.4033821614583335" IsExpanded="true" />
<EntityTypeShape EntityType="MINE_EF_Test.TICKET_PROPERTIES" Width="1.5" PointX="2.75" PointY="1.25" Height="1.787985026041667" IsExpanded="true" />
<AssociationConnector Association="MINE_EF_Test.TICKET_PROPERTIES_TICKET_FK" ManuallyRouted="false">
<ConnectorPoint PointX="2.25" PointY="1.8891910807291668" />
<ConnectorPoint PointX="2.75" PointY="1.8891910807291668" />
</AssociationConnector>
</Diagram>
</edmx:Diagrams>
</edmx:Designer></edmx:Edmx>
当前EF版本不提供从相关表到父实体属性的映射记录。此外,此场景需要动态属性,因为您可以使用不同的名称拥有不同数量的相关记录 您必须使用此方法:
MINE_EF_TestContext ctx = new MINE_EF_TestContext();
var someTickets = from t in ctx.Tickets
join p in ctx.Properties on t.Guid equals p.Guid
where p.FieldName == "FieldA" && p.FieldValue == "value a"
select t;