Use OData Annotations to Add CRUD Functionality to an MDK App

If you are a Fiori app designer, you may already be familiar with OData annotations and smart templates.

SAP Fiori elements provide designs for UI patterns and predefined templates for common application use cases. App developers can use SAP Fiori elements to create SAP Fiori applications based on OData services and annotations. With little or no coding, you can create SAP Fiori applications. UI5 has a Web solution, named smart templates, that builds a starter application by parsing the annotations in your OData service.

You can also check out more information on the Fiori elements List Report and Smart templates

Sample backend in SAP Mobile Services provides annotation functionality for Products. If you add annotation path in given backend endpoint, the same annotation information can be leveraged by MDK editor to generate related CRUD pages.

Make sure you have already configured an app in Mobile Services cockpit and have added Sample service as per step 3 in this tutorial.

1. In SAP MDK Demo App configuration, click Mobile Connectivity.

   

2. Click Edit icon to add annotation path to the SampleServiceV2 destination.

   

3. In following steps, let the existing settings as it is.

   In Annotations step, click Add Annotation URL to add OData Annotations to the Sample service.

   Provide the below information and click Next:

   Field	Value
   Annotation Name	Product
   Path/File	/annotations/Products

   

4. In the following screen, let the default settings as it is. Click Finish.

   Here you can see that OData Annotation information is updated in the SampleServiceV2 destination.

   

This step includes creating the mobile development kit project in the editor.

1. Launch the Dev space in SAP Business Application Studio.

2. Click Start from template on Welcome page.

   

   If you do not see Welcome page, you can access it via Help menu.

3. Select MDK Project and click Start.

   

4. In Type step, select or provide the below information and click Next:

   Field	Value
   MDK template type	Select Base from the dropdown
   Your project name	MDK_Annotations
   Your application name	<default name is same as project name, you can provide any name of your choice>

   

   More details on MDK template is available in help documentation.

   If you see Cloud foundry token expired, continue without mobile services connection? message, then set up the Cloud Foundry environment again by navigating to View menu > Find Command> CF: Login to Cloud foundry to initiate a valid session and click Start Over.

5. In Service Name step, provide or select the below information and click Next:

   Field	Value
   Service File Name	<Provide any name of your choice>
   OData Source	Select Mobile Services from the dropdown
   Mobile Services Landscape	Select standard from the dropdown
   Application Id	Select com.sap.mdk.demo from the dropdown
   Destination	Select SampleServiceV2 from the dropdown
   Enter a path to the OData service	Leave it as it is
   Language URL	Leave it with the default value
   Enable Offline	Choose No

   

   Regardless of whether you are creating an online or offline application, this step is needed for the app to connect to an OData service. When building an Mobile Development Kit application, it assumes the OData service created and the destination that points to this service is set up in Mobile Services and SAP Business Technology Platform.

   Since you will create an online based app, hence Enable Offline Store option is unchecked.

6. After clicking Next, the wizard will generate your MDK Application based on your selections. You should now see the MDK_Annotations project in the project explorer.

1. Right-click Application.app and select MDK:New MDK Annotation Component.

   

2. MDK editor fetches annotation details, select Product Annotation and click Next.

   

3. In Template Customization step, click Next.

   

4. Click Finish to create list detail from OData Annotation.

   In MDK project, you will see new pages, actions, rules have been generated for Product.

   

5. Next, you will add a Toolbar item on Main.page to navigate to Product_List.page.

   In Main.page, drag and drop Toolbar Item control on the page.

   

6. Change its Caption to Products.

   

7. Now, you will set the onPress event to NavToProduct_List.action.

   In Events tab, click the 3 dots icon for the OnPress property to open the Object Browser.

   Double-click the NavToProduct_List.action and click OK to set it as the OnPress action.

   

   Pages, actions and rules created are a starting point. You can edit those pages and make it your own. At this point the MDK editor is no longer reading the annotations from OData.

   For the List page, MDK supports the List Report. To create a Detail page, MDK requires UI.LineItem and UI.HeaderInfo in the annotation file.

   If the OData designer updates the backend services data schema (annotations), the MDK pages will stay as originally created. It will not automatically update the pages or overwrite your changes. You are disconnected from the annotations at this point.

So far, you have learned how to build an MDK application in the SAP Business Application Studio editor. Now, you will deploy this application definition to Mobile Services and Cloud Foundry to consume it as Mobile and Web application respectively.

1. Right-click Application.app and select MDK: Deploy.

   

2. Select deploy target as Mobile & Cloud.

   MDK editor will deploy the metadata to Mobile Services (for Mobile application) followed by to Cloud Foundry (for Web application).

   

   You should see successful messages for both deployments.