SAP Business Application Studio – Getting Started with CAP and SAP HANA Service on CF

In the new era of cloud , where we are moving towards Cloud Foundry environment , a next generation development environment is also required catering to the needs of developer.

Hence SAP Business Application Studio.

What is it ????

SAP Business Application Studio is a next generation, tailor made development environment available as a service on SAP Cloud Foundry which offers a modular development for business application for SAP Intelligent Enterprise.

Here developers can utilize more than 1 development space which are isolated from each other and let you run the application without deploying on Cloud Platform using its powerful terminal

CAP – SAP Cloud Application Programming Model

it is an open and opinionated model , which provides framework of libraries , languages and tools for the development of enterprise grade applications . It provides some best practices and guides developer with out of the box solutions for some common problems.

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So lets get started 

Prerequisite

1. SAP Cloud Platform Account (Foundry ) – Data center available  
2. Subscribed to SAP Business Application Studio
3. Relevant Roles for accessing the service – Authorization Management
4. SAP HANA Service hdi-shared

After Accessing the application

Create a Dev Space

Step 1 : Click on Create Dev Space

Step 2: Create Dev Space – Enter Name and Select SAP Cloud Business Application as a category

Start Developing

1. Open new terminal

2. type cd projects , to change the directly.

3.  setting up the project

mvn -B archetype:generate -DarchetypeArtifactId=cds-services-archetype -DarchetypeGroupId=com.sap.cds \
-DarchetypeVersion=1.2.0 -DcdsVersion=3.21.2 \
-DgroupId=com.sap.teched.cap -DartifactId=products-service -Dpackage=com.sap.teched.cap.productsservice

Open your project in the Studio

Lets Make CDS files

1. Navigate to db , create a file schema.cds

   namespace sap.capire.dev;
   
   
   
   entity Products  {
       title    : localized String(20);
       descr    : localized String(100);
       stock    : Integer;
       price    : Decimal(9,2);
       key id :Integer;
   
   }
   

2. Navigate to srv , create a file service.cds

   using { sap.capire.dev as db } from '../db/schema';
   
   service AdminService {
       entity Products   as projection on db.Products;
   }​

3. From terminal navigate to cd product-service using terminal.
4. type mvn clean install – to compile the project using terminal .
5. Now go to srv -> src -> main -> resources and open application.yaml and replace the content

   ---
   spring:
     profiles: default
     datasource:
       url: "jdbc:sqlite:/home/user/projects/products-service/sqlite.db"
       driver-class-name: org.sqlite.JDBC
       initialization-mode: never​

6. installing SAP HANA DB deployer

   npm install --save-dev --save-exact @sap/hdi-deploy@3.7.0​

7. login into CF account – using terminal type cf login and select the space
8. initialize DB and create SAP HANA Service instance – please make sure , you have the entitlement using terminal type , kindly type it manually

   cds deploy --to hana:bookstore-hana​

9. Go to srv->pom.xml and add the dependency

   <dependency>
           <groupId>com.sap.cds</groupId>
           <artifactId>cds-feature-hana</artifactId>
       </dependency>​

10. Time to run the application in the terminal

    mvn spring-boot:run -Dspring-boot.run.profiles=cloud​

     

     

11. Click on Expose and Open on the left Bottom and press Enter
12. Go Back to Application Studio and open new terminal
13. Test the service with POST call

    curl -X POST http://localhost:8080/odata/v4/AdminService/Products \
    -H "Content-Type: application/json" \
    -d '{ "title": "Product 1", "descr":"sample product ","stock":20,"price":100.60,"id":1 }' 

14. Now Lets check the service from step 11 , open Products and you shall be able to view the saved data

After successfully following these steps , you would be able to complete the setting up of SAP Business Application Studio on SAP Cloud Platform (Foundry) , creating an application using CAP , connecting it to SAP HANA Service and performing POST , GET operation on your ODATA service.

These are the screenshots taken from our SAP Cloud Platform account.