Schemi per lo strumento di ricerca delle annotazioni (applicazione di esempio EDM)

Le entità implementate in questa applicazione utilizzano Entity Data Model (EDM) e sono dichiarate e definite in CSDL (Conceptual Schema Definition Language). Tre entità vengono utilizzate per contenere i dati relativi a riferimenti Web, descrittori di riferimento e contatti. Una quarta entità è necessaria per contenere coppie di identificatori che connettono riferimenti e contatti. Per ulteriori informazioni sulle entità e sulle associazioni, vedere Specifiche EDM.

Ogni contatto può essere associato a numerosi riferimenti e l'associazione tra i contatti e i riferimenti deve essere implementata come un'associazione molti-a-molti. Ogni descrittore di riferimento contiene i dati relativi a un solo riferimento Web, ma un riferimento può essere correlato a numerosi descrittori di riferimento. L'associazione tra riferimenti e descrittori di riferimento viene implementata come relazione molti-a-uno.

Il segmento di schema seguente contiene la dichiarazione per l'entità Reference. La proprietà Key è specificata come proprietà ReferenceID. Vi sono tre proprietà aggiuntive: DocumentType, DocumentText e Locator. La proprietà Locator contiene l'URL utilizzato per trovare il riferimento Web. Sebbene DocumentType e DocumentText non vengano utilizzati dal codice dell'applicazione in questo esempio, vengono forniti per sperimentare ulteriori scenari in cui vengono utilizzate le funzionalità di ricerca full-text di SQL Server. Per ulteriori informazioni sugli schemi, vedere Schemi (EDM).

Una proprietà di navigazione denominata RefDescriptors fornisce un collegamento nel codice dell'applicazione a istanze dell'entità ReferenceDescriptor correlate a un'istanza del tipo Reference. Per ulteriori informazioni sulle proprietà di navigazione, vedere Proprietà di navigazione (EDM).

  <EntityType Name="Reference">
    <Key>
      <PropertyRef Name="ReferenceID" />
    </Key>
    <Property Name="ReferenceID" Type="Guid" Nullable="false" />
    <Property Name="DocumentType" Type="String" MaxLength="8" />
    <Property Name="DocumentText" Type="String" MaxLength="4000" />
    <Property Name="Locator" Type="String" Nullable="false"
         MaxLength="500" />
    <NavigationProperty Name="RefDescriptors"
         Relationship="Self.ReferenceDescriptor_Reference"
         FromRole="Reference" ToRole="ReferenceDescriptor" />
  </EntityType>

L'entità ReferenceDescriptor è dichiarata e definita nel segmento di schema seguente:

  <EntityType Name="ReferenceDescriptor">
    <Key>
      <PropertyRef Name="DescriptorID" />
    </Key>
    <Property Name="DescriptorID" Type="Guid" Nullable="false" />
    <Property Name="Annotation" Type="String" MaxLength="2000" />
    <Property Name="Keyword" Type="String" MaxLength="50" />
    <NavigationProperty Name="Reference"
          Relationship="Self.ReferenceDescriptor_Reference"
          FromRole="ReferenceDescriptor" ToRole="Reference" />
  </EntityType>

Questa entità contiene una proprietà Annotation e una proprietà Keyword. È possibile utilizzare una proprietà o entrambe per classificare e descrivere un oggetto Reference di una pagina Web. Ciascuna delle proprietà può essere Null, ma è necessario che una delle due sia assegnata. L'interfaccia utente dell'applicazione consente di eseguire la convalida, se necessario.

Una proprietà di navigazione nell'entità Reference utilizza l'oggetto Association definito nel segmento di schema seguente:

  <Association Name="ReferenceDescriptor_Reference">
    <End Role="Reference" Type="ResearchCollaborationDataModel.Reference" Multiplicity="1" />
    <End Role="ReferenceDescriptor"
       Type="ResearchCollaborationDataModel.ReferenceDescriptor"
       Multiplicity="*" />
  </Association>

I tag <End> utilizzati in questa associazione indicano le entità Reference e ReferenceDescriptor in una relazione uno-a-molti. Ogni oggetto Reference può essere descritto da qualsiasi numero di descrittori. Dopo la compilazione del modello a oggetti, la proprietà di navigazione funziona come un insieme di istanze di RefDescriptor. La proprietà di navigazione è compilata come ObjectQuery nel modello di dati programmabile.

Le definizioni End e Role in questa associazione sono sinonimi.

Implementazione dell'associazione molti-a-molti

Poiché qualsiasi numero di References può essere correlato a qualsiasi numero di Contacts, l'associazione tra queste entità deve essere implementata come associazione molti-a-molti. L'associazione molti-a-molti richiede una tabella dei collegamenti nell'implementazione dell'archiviazione e una dichiarazione di entità sia nello schema concettuale che nei metadati di archiviazione per rappresentare la tabella dei collegamenti. Vengono dichiarate quindi le associazioni tra l'entità di collegamento ed entrambe le entità Contact e Reference.

Nella dichiarazione di entità seguente in CSDL viene utilizza una tabella dei collegamenti nel database. Una dichiarazione simile in SSDL (Store Schema Definition Language) fornisce i metadati nella tabella dei collegamenti.

  <EntityType Name="ContactPersonReference">
    <Key>
      <PropertyRef Name="ContactPersonRefID" />
    </Key>
    <Property Name="ContactPersonRefID" Type="Guid" Nullable="false" />
      <NavigationProperty Name="RelatedReference"
          Relationship="Self.LinkTable_Reference"
          FromRole="ContactPersonReference" ToRole="Reference" />
      <NavigationProperty Name="RelatedContact"
          Relationship="Self.LinkTable_ContactPerson"
          FromRole="ContactPersonReference" ToRole="ContactPerson" />
  </EntityType>

La proprietà Key dell'identità è l'unica proprietà dichiarata in questo schema. Le proprietà di navigazione rappresentano insiemi di istanze di Reference correlate e di istanze di ContactPerson correlate. Nella tabella dati sono presenti colonne che contengono coppie di GUID ReferenceID e ContactPersonID.

Due associazioni supportano la relazione molti-a-molti: LinkTable_Reference e LinkTable_ContactPerson. Queste associazioni sono definite nella sintassi seguente:

  <AssociationSet Name="LinkTable_Reference"
      Association="ResearchCollaborationDataModel.LinkTable_Reference">
    <End Role="Reference" EntitySet="Reference" />
    <End Role="ContactPersonReference"
       EntitySet="ContactPersonReference" />
  </AssociationSet>

  <Association Name="LinkTable_ContactPerson">
    <End Role="ContactPerson" Type="ResearchCollaborationDataModel.ContactPerson" Multiplicity="1" />
    <End Role="ContactPersonReference"
       Type="ResearchCollaborationDataModel.ContactPersonReference"
       Multiplicity="*" />
  </Association>

Ognuna di queste associazioni è definita come relazione uno-a-molti, ma le proprietà di navigazione nell'entità di collegamento connettono insiemi di coppie Reference/ContactPerson.

Specifica di mapping e schemi completi

Nelle sezioni seguenti sono contenuti gli schemi e la specifica di mapping utilizzati in questo esempio.

Schema concettuale (CSDL)

Le entità e le associazioni utilizzate dall'applicazione sono definite in CSDL. Il modello a oggetti è compilato in base a questo schema di progettazione.

<?xml version="1.0" encoding="utf-8"?>
   <Schema Namespace="ResearchCollaborationDataModel" Alias="Self"
        xmlns="https://schemas.microsoft.com/ado/2006/04/edm">

  <EntityType Name="Reference">
    <Key>
      <PropertyRef Name="ReferenceID" />
    </Key>
    <Property Name="ReferenceID" Type="Guid" Nullable="false" />
    <Property Name="DocumentType" Type="String" />
    <Property Name="DocumentText" Type="String" />
    <Property Name="Locator" Type="String" Nullable="false" />
    <NavigationProperty Name="RefDescriptors"
 Relationship="Self.ReferenceDescriptor_Reference" FromRole="Reference"
 ToRole="ReferenceDescriptor" />
  </EntityType>

  <EntityType Name="ReferenceDescriptor">
    <Key>
      <PropertyRef Name="DescriptorID" />
    </Key>
    <Property Name="DescriptorID" Type="Guid" Nullable="false" />
    <Property Name="Annotation" Type="String" />
    <Property Name="Keyword" Type="String" />
    <NavigationProperty Name="Reference"
        Relationship="Self.ReferenceDescriptor_Reference"
        FromRole="ReferenceDescriptor" ToRole="Reference" />
  </EntityType>

  <EntityType Name="ContactPerson">
    <Key>
      <PropertyRef Name="ContactPersonID" />
    </Key>
    <Property Name="ContactPersonID" Type="Guid" Nullable="false" />
    <Property Name="LastName" Type="String" Nullable="false" />
    <Property Name="FirstName" Type="String" Nullable="false" />
    <Property Name="Title" Type="String" />
    <Property Name="Email" Type="String" Nullable="false" />
  </EntityType>

  <EntityType Name="ContactPersonReference">
    <Key>
      <PropertyRef Name="ContactPersonRefID" />
    </Key>
    <Property Name="ContactPersonRefID" Type="Guid" Nullable="false" />
      <NavigationProperty Name="RelatedReference" Relationship="Self.LinkTable_Reference"
            FromRole="ContactPersonReference" ToRole="Reference" />
      <NavigationProperty Name="RelatedContact" Relationship="Self.LinkTable_ContactPerson"
        FromRole="ContactPersonReference" ToRole="ContactPerson" />
  </EntityType>

  <Association Name="ReferenceDescriptor_Reference">
    <End Role="Reference" Type="ResearchCollaborationDataModel.Reference" Multiplicity="1" />
    <End Role="ReferenceDescriptor" Type="ResearchCollaborationDataModel.ReferenceDescriptor" Multiplicity="*" />
  </Association>

  <Association Name="LinkTable_ContactPerson">
    <End Role="ContactPerson" Type="ResearchCollaborationDataModel.ContactPerson" Multiplicity="1" />
    <End Role="ContactPersonReference" Type="ResearchCollaborationDataModel.ContactPersonReference" Multiplicity="*" />
  </Association>

  <Association Name="LinkTable_Reference">
    <End Role="Reference" Type="ResearchCollaborationDataModel.Reference" Multiplicity="1" />
    <End Role="ContactPersonReference"
 Type="ResearchCollaborationDataModel.ContactPersonReference"
 Multiplicity="*" />
  </Association>

  <EntityContainer Name="ResearchCollaborationData">
      
    <EntitySet Name="ContactPerson"
 EntityType="ResearchCollaborationDataModel.ContactPerson" />
    <EntitySet Name="ContactPersonReference"
 EntityType="ResearchCollaborationDataModel.ContactPersonReference" />
    <EntitySet Name="Reference" EntityType="ResearchCollaborationDataModel.Reference" />
    <EntitySet Name="ReferenceDescriptor"
 EntityType="ResearchCollaborationDataModel.ReferenceDescriptor" />
    
    <AssociationSet Name="LinkTable_ContactPerson"
 Association="ResearchCollaborationDataModel.LinkTable_ContactPerson">
      <End Role="ContactPerson" EntitySet="ContactPerson" />
      <End Role="ContactPersonReference"
           EntitySet="ContactPersonReference" />
    </AssociationSet>
    
    <AssociationSet Name="LinkTable_Reference"
 Association="ResearchCollaborationDataModel.LinkTable_Reference">
      <End Role="Reference" EntitySet="Reference" />
      <End Role="ContactPersonReference"
            EntitySet="ContactPersonReference" />
    </AssociationSet>
    
    <AssociationSet Name="ReferenceDescriptor_Reference"
 Association="ResearchCollaborationDataModel.ReferenceDescriptor_Reference">
      <End Role="Reference" EntitySet="Reference" />
      <End Role="ReferenceDescriptor" EntitySet="ReferenceDescriptor" />
    </AssociationSet>

  </EntityContainer>

</Schema>

Schema dei metadati di archiviazione (SSDL)

I metadati nelle strutture di archiviazione utilizzate dalle applicazioni EDM sono definiti utilizzando SSDL.

<?xml version="1.0" encoding="utf-8"?>
  <Schema Namespace="ResearchCollaborationDataTarget" Alias="Self"
      Provider="System.Data.SqlClient"
      ProviderManifestToken="2005"
      xmlns="https://schemas.microsoft.com/ado/2006/04/edm/ssdl">

  <EntityType Name="ContactPerson">
    <Key>
      <PropertyRef Name="ContactPersonID" />
    </Key>
    <Property Name="ContactPersonID" Type="uniqueidentifier"
         Nullable="false" />
    <Property Name="LastName" Type="nvarchar" Nullable="false"
         MaxLength="50" />
    <Property Name="FirstName" Type="nvarchar" Nullable="false"
         MaxLength="50" />
    <Property Name="Title" Type="nvarchar" MaxLength="50" />
    <Property Name="Email" Type="nvarchar" Nullable="false"
         MaxLength="50" />
  </EntityType>

  <EntityType Name="ContactPersonReference">
    <Key>
      <PropertyRef Name="ContactPersonRefID" />
    </Key>
    <Property Name="ContactPersonID" Type="uniqueidentifier"
          Nullable="false" />
    <Property Name="ReferenceID" Type="uniqueidentifier"
          Nullable="false" />
    <Property Name="ContactPersonRefID" Type="uniqueidentifier"
          Nullable="false" />
  </EntityType>

  <EntityType Name="Reference">
    <Key>
      <PropertyRef Name="ReferenceID" />
    </Key>
    <Property Name="ReferenceID" Type="uniqueidentifier"
         Nullable="false" />
    <Property Name="DocumentType" Type="nvarchar" MaxLength="8" />
    <Property Name="DocumentText" Type="nvarchar" MaxLength="4000" />
    <Property Name="Locator" Type="nvarchar" Nullable="false"
         MaxLength="500" />
  </EntityType>

  <EntityType Name="ReferenceDescriptor">
    <Key>
      <PropertyRef Name="DescriptorID" />
    </Key>
    <Property Name="DescriptorID" Type="uniqueidentifier"
           Nullable="false" />
    <Property Name="ReferenceID" Type="uniqueidentifier"
           Nullable="false" />
    <Property Name="Annotation" Type="nvarchar" MaxLength="2000" />
    <Property Name="Keyword" Type="nvarchar" MaxLength="50" />
  </EntityType>

  <Association Name="LinkTable_ContactPerson">
    <End Role="ContactPerson"
          Type="ResearchCollaborationDataTarget.ContactPerson" Multiplicity="1"/>
    <End Role="ContactPersonReference"
       Type="ResearchCollaborationDataTarget.ContactPersonReference"
       Multiplicity="*" />
    <ReferentialConstraint>
      <Principal Role="ContactPerson">
        <PropertyRef Name="ContactPersonID" />
      </Principal>
      <Dependent Role="ContactPersonReference">
        <PropertyRef Name="ContactPersonID" />
      </Dependent>
    </ReferentialConstraint>
  </Association>

  <Association Name="LinkTable_Reference">
    <End Role="Reference"
         Type="ResearchCollaborationDataTarget.Reference"
         Multiplicity="1" />
    <End Role="ContactPersonReference"
       Type="ResearchCollaborationDataTarget.ContactPersonReference"
       Multiplicity="*" />
    <ReferentialConstraint>
      <Principal Role="Reference">
        <PropertyRef Name="ReferenceID" />
      </Principal>
      <Dependent Role="ContactPersonReference">
        <PropertyRef Name="ReferenceID" />
      </Dependent>
    </ReferentialConstraint>
  </Association>

  <Association Name="ReferenceDescriptor_Reference">
    <End Role="Reference"
   Type="ResearchCollaborationDataTarget.Reference" Multiplicity="1" />
    <End Role="ReferenceDescriptor"
           Type="ResearchCollaborationDataTarget.ReferenceDescriptor"
           Multiplicity="*" />
    <ReferentialConstraint>
      <Principal Role="Reference">
        <PropertyRef Name="ReferenceID" />
      </Principal>
      <Dependent Role="ReferenceDescriptor">
        <PropertyRef Name="ReferenceID" />
      </Dependent>
    </ReferentialConstraint>
  </Association>

  <EntityContainer Name="dbo">
    <EntitySet Name="ContactPerson"
       EntityType="ResearchCollaborationDataTarget.ContactPerson" />
    <EntitySet Name="ContactPersonReference"
 EntityType="ResearchCollaborationDataTarget.ContactPersonReference"/>
    <EntitySet Name="Reference"
       EntityType="ResearchCollaborationDataTarget.Reference" />
    <EntitySet Name="ReferenceDescriptor"
   EntityType="ResearchCollaborationDataTarget.ReferenceDescriptor"/>

    <AssociationSet Name="LinkTable_ContactPerson"
  Association="ResearchCollaborationDataTarget.LinkTable_ContactPerson">
      <End Role="ContactPerson" EntitySet="ContactPerson" />
      <End Role="ContactPersonReference"
          EntitySet="ContactPersonReference" />
    </AssociationSet>
    <AssociationSet Name="LinkTable_Reference"
    Association="ResearchCollaborationDataTarget.LinkTable_Reference">
      <End Role="Reference" EntitySet="Reference" />
      <End Role="ContactPersonReference"
          EntitySet="ContactPersonReference" />
    </AssociationSet>

    <AssociationSet Name="ReferenceDescriptor_Reference"
 Association="ResearchCollaborationDataTarget.ReferenceDescriptor_Reference">
      <End Role="Reference" EntitySet="Reference" />
      <End Role="ReferenceDescriptor" EntitySet="ReferenceDescriptor" />
    </AssociationSet>
  </EntityContainer>

</Schema>

Specifica di mapping (MSL)

Le entità e le associazioni definite in CSDL sono mappate ai metadati di archiviazione in SSDL tramite MSL (Mapping Specification Language).

<?xml version="1.0" encoding="utf-8"?>
<Mapping Space="C-S"
    xmlns:edm="urn:schemas-microsoft-com:windows:storage:mapping:CS"
    xmlns="urn:schemas-microsoft-com:windows:storage:mapping:CS">

  <edm:EntityContainerMapping
           CdmEntityContainer="ResearchCollaborationData"
           StorageEntityContainer="dbo">
    <edm:EntitySetMapping Name="ContactPerson">
      <edm:EntityTypeMapping
         TypeName="ResearchCollaborationDataModel.ContactPerson">
        <edm:MappingFragment StoreEntitySet="ContactPerson">
          <edm:ScalarProperty Name="ContactPersonID"
               ColumnName="ContactPersonID" />
          <edm:ScalarProperty Name="LastName" ColumnName="LastName"/>
          <edm:ScalarProperty Name="FirstName" 
               ColumnName="FirstName" />
          <edm:ScalarProperty Name="Title" ColumnName="Title" />
          <edm:ScalarProperty Name="Email" ColumnName="Email" />
        </edm:MappingFragment>
      </edm:EntityTypeMapping>
    </edm:EntitySetMapping>
    <edm:EntitySetMapping Name="ContactPersonReference">
      <edm:EntityTypeMapping
    TypeName="ResearchCollaborationDataModel.ContactPersonReference">
        <edm:MappingFragment StoreEntitySet="ContactPersonReference">
          <edm:ScalarProperty Name="ContactPersonRefID"
              ColumnName="ContactPersonRefID" />
        </edm:MappingFragment>
      </edm:EntityTypeMapping>
    </edm:EntitySetMapping>
    <edm:EntitySetMapping Name="Reference">
      <edm:EntityTypeMapping
            TypeName="ResearchCollaborationDataModel.Reference">
        <edm:MappingFragment StoreEntitySet="Reference">
          <edm:ScalarProperty Name="ReferenceID"
               ColumnName="ReferenceID" />
          <edm:ScalarProperty Name="DocumentType"
               ColumnName="DocumentType" />
          <edm:ScalarProperty Name="DocumentText"
               ColumnName="DocumentText" />
          <edm:ScalarProperty Name="Locator" 
               ColumnName="Locator" />
        </edm:MappingFragment>
      </edm:EntityTypeMapping>
    </edm:EntitySetMapping>
    <edm:EntitySetMapping Name="ReferenceDescriptor">
      <edm:EntityTypeMapping
       TypeName="ResearchCollaborationDataModel.ReferenceDescriptor">
        <edm:MappingFragment StoreEntitySet="ReferenceDescriptor">
          <edm:ScalarProperty Name="DescriptorID"
               ColumnName="DescriptorID" />
          <edm:ScalarProperty Name="Annotation" 
               ColumnName="Annotation" />
          <edm:ScalarProperty Name="Keyword" ColumnName="Keyword" />
        </edm:MappingFragment>
      </edm:EntityTypeMapping>
    </edm:EntitySetMapping>
    <edm:AssociationSetMapping Name="LinkTable_ContactPerson"
      TypeName="ResearchCollaborationDataModel.LinkTable_ContactPerson"
        StoreEntitySet="ContactPersonReference">
      <edm:EndProperty Name="ContactPerson">
        <edm:ScalarProperty Name="ContactPersonID"
              ColumnName="ContactPersonID" />
      </edm:EndProperty>
      <edm:EndProperty Name="ContactPersonReference">
        <edm:ScalarProperty Name="ContactPersonRefID"
             ColumnName="ContactPersonRefID" />
      </edm:EndProperty>
      <edm:Condition ColumnName="ContactPersonID" IsNull="false" />
    </edm:AssociationSetMapping>
    <edm:AssociationSetMapping Name="LinkTable_Reference"
         TypeName="ResearchCollaborationDataModel.LinkTable_Reference"
         StoreEntitySet="ContactPersonReference">
      <edm:EndProperty Name="Reference">
        <edm:ScalarProperty Name="ReferenceID" 
              ColumnName="ReferenceID" />
      </edm:EndProperty>
      <edm:EndProperty Name="ContactPersonReference">
        <edm:ScalarProperty Name="ContactPersonRefID"
             ColumnName="ContactPersonRefID" />
      </edm:EndProperty>
      <edm:Condition ColumnName="ReferenceID" IsNull="false" />
    </edm:AssociationSetMapping>
    <edm:AssociationSetMapping Name="ReferenceDescriptor_Reference"
  TypeName="ResearchCollaborationDataModel.ReferenceDescriptor_Reference"
  StoreEntitySet="ReferenceDescriptor">
      <edm:EndProperty Name="Reference">
        <edm:ScalarProperty Name="ReferenceID" 
            ColumnName="ReferenceID" />
      </edm:EndProperty>
      <edm:EndProperty Name="ReferenceDescriptor">
        <edm:ScalarProperty Name="DescriptorID"
            ColumnName="DescriptorID" />
      </edm:EndProperty>
      <edm:Condition ColumnName="ReferenceID" IsNull="false" />
    </edm:AssociationSetMapping>
  </edm:EntityContainerMapping>
</Mapping>

Lo script seguente può essere utilizzato per creare il database utilizzato in questo esempio. Per creare lo schema e il database ResearchCollaborationData con SQL Server Management Studio:

1. Scegliere Nuovo dal menu File, quindi fare clic su Query del Motore di database.

2. Nella finestra di dialogo Connetti al Motore di database digitare localhost oppure il nome dell'istanza di SQL Server, quindi fare clic su Connetti.

3. Incollare lo script Transact-SQL seguente nella finestra di query, quindi fare clic su Esegui.

SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO

USE [master];
GO

IF EXISTS (SELECT * FROM sys.databases 
WHERE name = 'ResearchCollaborationData')
DROP DATABASE ResearchCollaborationData;
GO

-- Create the database.
CREATE DATABASE ResearchCollaborationData;
GO

USE ResearchCollaborationData;
GO

IF NOT EXISTS (SELECT * FROM sys.objects 
WHERE object_id = OBJECT_ID(N'[dbo].[ContactPerson]') 
AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[ContactPerson](
[ContactPersonID] [uniqueidentifier] NOT NULL,
[LastName] [nvarchar](50) NOT NULL,
[FirstName] [nvarchar](50) NOT NULL,
[Title] [nvarchar](50) NULL,
[Email] [nvarchar](50) NOT NULL,
 CONSTRAINT [PK_ContactPerson] PRIMARY KEY CLUSTERED 
(
[ContactPersonID] ASC
)WITH (PAD_INDEX  = OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
END
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
IF NOT EXISTS (SELECT * FROM sys.objects 
WHERE object_id = OBJECT_ID(N'[dbo].[Reference]') 
AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[Reference](
[ReferenceID] [uniqueidentifier] NOT NULL,
[DocumentType] [nvarchar](8) NULL,
[DocumentText] [nvarchar](max) NULL,
[Locator] [nvarchar](500) NOT NULL,
 CONSTRAINT [PK_Reference] PRIMARY KEY CLUSTERED 
(
[ReferenceID] ASC
)WITH (PAD_INDEX  = OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
END
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
IF NOT EXISTS (SELECT * FROM sys.objects 
WHERE object_id = OBJECT_ID(N'[dbo].[ContactPersonReference]') 
AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[ContactPersonReference](
[ContactPersonID] [uniqueidentifier] NOT NULL,
[ReferenceID] [uniqueidentifier] NOT NULL,
[ContactPersonRefID] [uniqueidentifier] NOT NULL,
 CONSTRAINT [PK_ContactPersonReference] PRIMARY KEY CLUSTERED 
(
[ContactPersonRefID] ASC
)WITH (PAD_INDEX  = OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
END
GO
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
IF NOT EXISTS (SELECT * FROM sys.objects 
WHERE object_id = OBJECT_ID(N'[dbo].[ReferenceDescriptor]') 
AND type in (N'U'))
BEGIN
CREATE TABLE [dbo].[ReferenceDescriptor](
[DescriptorID] [uniqueidentifier] NOT NULL,
[ReferenceID] [uniqueidentifier] NOT NULL,
[Annotation] [nvarchar](2000) NULL,
[Keyword] [nvarchar](50) NULL,
 CONSTRAINT [PK_ReferenceDescriptor] PRIMARY KEY CLUSTERED 
(
[DescriptorID] ASC
)WITH (PAD_INDEX  = OFF, IGNORE_DUP_KEY = OFF) ON [PRIMARY]
) ON [PRIMARY]
END
GO
IF NOT EXISTS (SELECT * FROM sys.foreign_keys 
WHERE object_id = OBJECT_ID(N'[dbo].[LinkTable_ContactPerson]') AND parent_object_id = 
OBJECT_ID(N'[dbo].[ContactPersonReference]'))
ALTER TABLE [dbo].[ContactPersonReference]  
WITH CHECK ADD  CONSTRAINT [LinkTable_ContactPerson] FOREIGN KEY([ContactPersonID])
REFERENCES [dbo].[ContactPerson] ([ContactPersonID])
GO
ALTER TABLE [dbo].[ContactPersonReference] CHECK CONSTRAINT [LinkTable_ContactPerson]
GO
IF NOT EXISTS (SELECT * FROM sys.foreign_keys 
WHERE object_id = OBJECT_ID(N'[dbo].[LinkTable_Reference]') AND parent_object_id = 
OBJECT_ID(N'[dbo].[ContactPersonReference]'))
ALTER TABLE [dbo].[ContactPersonReference]  
WITH CHECK ADD  CONSTRAINT [LinkTable_Reference] FOREIGN KEY([ReferenceID])
REFERENCES [dbo].[Reference] ([ReferenceID])
GO
ALTER TABLE [dbo].[ContactPersonReference] CHECK CONSTRAINT [LinkTable_Reference]
GO
IF NOT EXISTS (SELECT * FROM sys.foreign_keys 
WHERE object_id = OBJECT_ID(N'[dbo].[ReferenceDescriptor_Reference]') 
AND parent_object_id = OBJECT_ID(N'[dbo].[ReferenceDescriptor]'))
ALTER TABLE [dbo].[ReferenceDescriptor]  
WITH CHECK ADD  CONSTRAINT [ReferenceDescriptor_Reference] FOREIGN KEY([ReferenceID])
REFERENCES [dbo].[Reference] ([ReferenceID])
GO
ALTER TABLE [dbo].[ReferenceDescriptor] CHECK CONSTRAINT [ReferenceDescriptor_Reference]
GO

USE ResearchCollaborationData
GO

INSERT INTO dbo.Reference(ReferenceId, DocumentType, DocumentText, Locator)
VALUES ('12b18fe1-be82-486c-b248-00183aad2c88', '', '', 'https://msdn2.microsoft.com/en-us/data/aa937722.aspx')
INSERT INTO dbo.Reference(ReferenceId, DocumentType, DocumentText, Locator)
VALUES ('34bf3c5f-202a-45fe-af42-0a1d9bf489e2', '', '', 'https://msdn2.microsoft.com/en-us/library/190bkk9s.aspx')
INSERT INTO dbo.Reference(ReferenceId, DocumentType, DocumentText, Locator)
VALUES ('cfc4a592-296d-4b6f-b8fe-0e7a42b4a29a', '', '', 'https://blogs.msdn.com/adonet/archive/2007/01/30/entity-data-model-part-1.aspx')
INSERT INTO dbo.Reference(ReferenceId, DocumentType, DocumentText, Locator)
VALUES ('aad24f4c-c461-4d62-8723-6b52574311d1', '', '', 'https://www.microsoft.com/windows/directx/productinfo/overview/default.mspx')
INSERT INTO dbo.Reference(ReferenceId, DocumentType, DocumentText, Locator)
VALUES ('7d4a1c27-3046-4866-974f-81b1e4642719', '', '', 'https://msdn2.microsoft.com/en-us/library/ms269115.aspx')
INSERT INTO dbo.Reference(ReferenceId, DocumentType, DocumentText, Locator)
VALUES ('7b217f44-3ed0-492f-aaf6-8c064e3e8c75', '', '', 'https://www.microsoft.com/casestudies/casestudy.aspx?casestudyid=49271')
INSERT INTO dbo.Reference(ReferenceId, DocumentType, DocumentText, Locator)
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ADO.NET
The designer in this CTP is an early prototype and only supports designing the “Conceptual” layer. The designer can also generate an Entity Data Model with 1:1 mappings from an existing database that you can use right away in your application while also graphically visualizing the “Conceptual” layer. Please take a look at the walkthroughs in the Overview document included with the Entity Data Model Designer prototype for more details.
https://blogs.msdn.com/adonet/archive/2006/09/27/ADONET_vNext_EDM_Designer.aspx

ADO.NET 2.0

https://msdn2.microsoft.com/en-us/data/aa937722.aspx

EDM
Generate an Entity Data Model with 1:1 mappings from an existing database that you can use right away in your application while also graphically visualizing the “Conceptual” layer. To aid brainstorming and to better understand typical developer scenarios, the ADO.NET team created an internal prototype of a designer to let developers model the ADO.NET vNext “Conceptual” layer.
https://blogs.msdn.com/adonet/archive/2006/09/27/ADONET_vNext_EDM_Designer.aspx

Entity Data Model 101
Most developers are familiar with the Object/Relational Mapping (ORM) problem: databases use the abstraction of rows in tables, but application programs use the abstraction of classes and objects. Existing ORM frameworks tend to address this mismatch by allowing programming classes to be annotated in order to relate them to the database. 
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https://blogs.msdn.com/adonet/archive/2007/01/30/entity-data-model-part-1.aspx
', 'Visual Studio pre-release product, '1ca96c96-cd2a-48b2-998f-a3fd0b98234e')
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Vedere anche

Concetti

Strumento di ausilio ricerche e di annotazione (applicazione di esempio EDM)
Codice dell'applicazione strumento di ricerca delle annotazioni (applicazione di esempio EDM)
Associazione (EDM)
EntityType (EDM)

Altre risorse

Specifiche EDM
Specifica di schemi e mapping (Entity Framework)