Quelltext der Seite SAP Cloud Application Programming Model Getting Started (CAP)

This article describes how to build Cloud Application Programming Model projects (CAP projects) and according artefacts with Core Data Services (CDS).

Source: ABAP Freak Show Ep. 1 - HANA Cloud and the Business Application Studio

https://www.youtube.com/watch?v=a3WPQwmpbvI&list=PLoc6uc3ML1JR38-V46qhmGIKG07nXwO6X&index=71

For local native development see [[SAP HANA Local Native Development]]

All-in-one Quick Start: https://github.com/SAP-samples/cloud-cap-walkthroughs/blob/master/exercises-node/intro/README.md

More Repositories: https://github.com/SAP-samples/cloud-cap-samples --> Use opensap*-Branches

== Installation of Prerequisites==

'''Relevant Tools from SAP'''

 npm i -g @sap/cds
 npm i -g @sap/cds-dk

'''Additional 3rd Party Tools'''1

 npm i -g hana-cli

== Create CDS Project ==

 cds init bookshop

or

 cds init MyCDSProject --add hana, mta

== Start Service ==

 cds watch

This also monitors changes to the underlying files and restarts when a file has changed.

== Create Persistency from CDS ==

 cds deploy --to sqlite          # Deploys to sqlite.db
 cds deploy --to sqlite:my.db    # Deploys to my.db
 cds deploy --to hana            # Deploys to HDI container on HANA
                                 # (Requires Cloud Foundry login)    

This also updates the package.json

Deployment to sqlite requires node module sqlite3. To install it execute in the root of the project folder:

 npm install sqlite3

In order to see the actual created SQL statements:

 cds compile srv/cat-service.cds --to sql     # Creates SQL statements
 cds compile srv/cat-service.cds --to hana    # Creates hdbcds or hdbtable/hdbview artefacts
 
== Deployment to SAP Business Technology Platform (BTP) ==

Login to CF space:

 cf login

=== Build Deployment Package ===

 cds add hana

''package.json'' needs to contain ''"kind": "hana"''. 

Also when deploying to BTP which is internally HANA 4.0 ''"deploy-format": "hdbtable"'' has to be set and hdi-deploy should be at least version 4. Example:

<syntaxhighlight lang="JSON">
{
    ...
    "devDependencies": {
        "@sap/hdi-deploy": "^4"
    },
    ...
    "cds": {
        "hana": {
            "deploy-format": "hdbtable"
        },
        "requires": {
            "db": {
                "model": [
                    "db",
                    "srv"
                ],
                "kind": "hana"
            }
        }
    }
}
</syntaxhighlight>

=== Deploy via Cloud Foundry CLI ===

Build the deployment artifacts:

 cds build/all

Create a hana service for the hdi-container. The stated hdi-container name must correlate to the services-name in ''/gen/db/src/manifest.yaml''.

 cf create-service hana hdi-shared <app-db-hdi-container>

Now push the DB deployer application and also the actual service application:

 cf push -f gen/db
 cf push -f gen/srv --random-route

=== Deploy via MTA ===

Install MTA Build Tool

 npm install -g mbt

Generate MTA project descriptor file ''mta.yaml'' and build MTA archive:

 mbt build

Deploy MTA archive to CF space:

 cf deploy mta_archives/<buildmta>.mtar

=== Troubleshooting ===

Real-time output of CF services can be displayed in BAS terminal with

 cf logs <appname>

[[Category:SAP]]
[[Category:HANA]]