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App-scoped external content types in SharePoint 2013

SharePoint 2013

Learn about external content types that are installed or scoped at the app level in SharePoint 2013 and enable you to create data-rich apps for SharePoint using external data sources.

In SharePoint 2010, you can install and use external content types only at the farm level. This often causes problems for developers because even for simple applications, an administrator had to be involved because of the access rights that are needed to install at the farm level.

In SharePoint 2013, applications are basically isolated into more autonomous units called apps. Apps contain all the resources they need to run. This approach enables a running application to be insulated from other applications. The benefits of this architecture are as follows:

  • You can create apps that are aligned with the new application model of SharePoint 2013.

  • You can create apps that access external data from SAP, Netflix, and proprietary and other types of data without involving the tenant administrator.

  • Access to external applications is maintained through Business Connectivity Services (BCS), which provides a consistent and uniform interface that can be used by other SharePoint applications.

App-scoped external content types provide access to external data within an app.

The following are the requirements for developing external content types that are scoped at the app level:

  • Visual Studio 2012

  • Office Developer Tools for Visual Studio 2012

  • SharePoint 2013

For information about setting up your SharePoint development environment, see Start: Set up the development environment for SharePoint 2013.

App-scoped external content type essentials

Table 1 contains some core concepts that you should be familiar with when working with app-scoped external content types.

Table 1. Core concepts for understanding app-scoped external content types

Article

Description

External content types in SharePoint 2013

Learn how to create BCS external content types.

Overview of apps for SharePoint

Learn about the new app model in SharePoint 2013 that enables you to create apps, which are small, easy-to-use solutions for end users.

How to: Create a basic SharePoint-hosted app

Learn how to create a basic SharePoint-hosted app by using the Office Developer Tools for Visual Studio 2012.

The primary reason for adding an app-scoped external content type is to provide access to external data from an individual app. This allows you to do the following:

  • Limit access to external content types to a particular app.

  • Deploy external content types within an app.

Create app-scoped external content types

The concept of a file-based metadata catalog was introduced in SharePoint 2010. It enables you to specify a file that contains the XML needed to define external content types. This file can be deployed within a WSP package and pertains only to the application that it is scoped for. By using this metadata file, external content types can be restricted to the app level.

In SharePoint 2013, SPListDataSource has been modified to add a property that indicates the scope of the application.

This class serves as the bridge between SPList and an external list. Use the associated SPList to retrieve entity fields and data. Retrieve an instance of SPListDataSource from the HasExternalDataSource property. When HasExternalDataSource is not null, the SPList object's data is external to SharePoint 2013.

When you want to add an app-scoped external content type, this property is set to App.

The MetadataCatalogFileName property is used to define the BDC model file that contains the external content type definition. This property can be defined declaratively or programmatically, but not in the SharePoint user interface (UI).

The following example shows how to set the MetadataCatalogFileName property declaratively.

<DataSource>
  <Property Name="Entity" Value="Customer" />
  <Property Name="EntityNamespace" Value="SAP" />
  <Property Name="LobSystemInstanceName" Value="SAPClient1" />
  <Property Name="SpecificFinder" Value="ReadCustomer" />
  <Property Name=" MetadataCatalogFileName" Value="BDCMetadata.bdcm" />
</DataSource>
NoteNote

Site administrators can install apps that use App-Scoped-ECTs, but only SiteCollection administrators can grant permissions for Apps to Use BCS Connections.

Deploy an app-scoped external content type in a custom Feature in a WSP file

You can include a BDC model in a WSP file for deployment. The following example shows how to include a BDC model in the app.


<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
  <BdcModel Path="BDCMetadata.bdcm">
  </BdcModel>
</Elements>

Important noteImportant

Only one BDC model file can be included per app. While the file name in this example is BDCMetadata.bdcm, the model file can actually be any name you choose as long as the file name matches that is in the Path attribute of the BDC model file.

NoteNote

Only Open Data protocol (OData) connections are allowed for app-scoped external content types.

Set security credentials for an external system

In order to access data on a secured external system, you must configure the BDC model with the appropriate credentials.

The following example shows how to set security credentials for an external system in app-scoped external content types by modifying the Elements.xml file of the app.

<Elements xmlns="http://schemas.microsoft.com/sharepoint/">
  <BdcModel Path="BDCMetadata.bdcm">
    <LobSystem Name="SAP">
       <LobSystemInstance Name="SAPInst" RequireCredentials="true" CredentialsDescription="Credentials to connect to SAP"/>
    </LobSystem>
    <LobSystem Name="SQL">
       <LobSystemInstance Name="App Database" DataSource="SQL-Azure" RequireCredentials="true" />
    </LobSystem>
  </BdcModel>
</Elements>

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