Everything in CAP / Java
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Domain: Data & Persistence
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Java: Answers in Java
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E2E: SAP Cloud Platform Internet of Things to SAP Analytics CloudE2E: SAP Cloud Platform Internet of Things to SAP Analytics CloudDevice data from ingestion to chart, with CAP occupying the middle: a CDS-defined persistence on HANA Cloud, and an OData service published from it for Analytics Cloud to consume live. The interesting choice is that CAP is used for the model rather than for business logic — there is barely any.Gunter, published 2020-08-31
Data modellingSAP only
Computed field example in CAPComputed field example in CAPAn answer to a Community question — how to count the entities on the far side of an association — written up as a short post rather than left in a thread. The answer combines CDS with Node.js service events, which is the seam worth noticing: some of what looks like modelling is expressed in the model and some has to be computed when the request arrives, and the boundary between them is not obvious from either side.published 2019-08-21
Computed field example in CAP
Data modelling has changed 3 times since this was published, most recently in @sap/cds 9.9.0, 2026-04-23. Affects A recipe, Runnable code.
First Java Cap ApplicationFirst Java Cap ApplicationA step-by-step walkthrough of a first CAP Java project: com.sap.cds:cds-services-archetype scaffolds the initial Maven project, and the domain model is then rewritten in the db folder with entities, the cuid and managed aspects, associations, compositions and a CodeList, so a hand-coded event handler serving a single entity gives way to a service that CAP's generic persistence handling serves without custom code. It deploys that model to SQLite for local development — cds deploy --to sqlite, then a Spring profile pointing at the generated database file — and ends by adding an index.cds so the model and service can be published as a reusable npm module.bruce_wang3, published 2020-12-08
SAP Cloud Platform Backend service: Tutorial [11]: CDS : magic: key: generationSAP Cloud Platform Backend service: Tutorial [11]: CDS : magic: key: generationExplains CDS's UUID key type: giving a key property UUID gets its value generated automatically instead of a hand-picked unused number, as data modelling lets an element's type do, at the cost of a 36-character value unfit for a user-facing display. It then works out how that generated value is addressed in a single-entity read URL — bare brackets in OData V4 against the guid'...' literal V2 requires — citing the OData specification for the difference.CarlosRoggan, published 2019-03-15
Database connectorsSAP only
First Java Cap ApplicationFirst Java Cap ApplicationA step-by-step walkthrough of a first CAP Java project: com.sap.cds:cds-services-archetype scaffolds the initial Maven project, and the domain model is then rewritten in the db folder with entities, the cuid and managed aspects, associations, compositions and a CodeList, so a hand-coded event handler serving a single entity gives way to a service that CAP's generic persistence handling serves without custom code. It deploys that model to SQLite for local development — cds deploy --to sqlite, then a Spring profile pointing at the generated database file — and ends by adding an index.cds so the model and service can be published as a reusable npm module.bruce_wang3, published 2020-12-08
Getting started with CAP on PostgreSQL (Node.js)Getting started with CAP on PostgreSQL (Node.js)Running CAP on PostgreSQL locally in 2020, when doing so meant the community packages cds-pg and cds-dbm. It now opens with a banner the author added later: @sap/cds 7.0.0 has native PostgreSQL support, use @cap-js/postgres instead, with a pointer to a step-by-step guide for it. Worth having for that banner as much as for the content — a post that tells you not to follow it is a dated fact about where the answer moved.published 2020-11-16
Getting started with CAP on PostgreSQL (Node.js)
cds-pg. Affects Runnable code.
PostgreSQL persistence adapter for CAP (Node.js)PostgreSQL persistence adapter for CAP (Node.js)The contradiction the adapter was built to resolve, stated plainly in 2020: CAP's core is open, non-intrusive and platform-agnostic, which is what would let it run outside SAP's world — except that HANA was the only officially supported production persistence and HANA exists only inside BTP. cds-pg is the answer to that, and this is the post that argues for it. Read now as the front end of a story whose other end is the 2023 post recording cds-pg's deprecation in favour of @cap-js/postgres.published 2020-08-20
PostgreSQL persistence adapter for CAP (Node.js)
cds-pg is archived. @cap-js/postgres answers the same capability. Affects Runnable code.
Run and Deploy CAP with PostgreSQL on SAP BTP Cloud Foundry (Node.js)Run and Deploy CAP with PostgreSQL on SAP BTP Cloud Foundry (Node.js)The deployment half of the pair, two weeks after the local one, and superseded the same way: it carries the same banner directing readers to @cap-js/postgres and the official documentation. The two together are the community PostgreSQL path as it stood before the core absorbed it.published 2020-11-30
Run and Deploy CAP with PostgreSQL on SAP BTP Cloud Foundry (Node.js)
cds-dbm. Affects Runnable code.
SAP Cloud Application Programming Model（CAP）：概要およびデモ - Part 1SAP Cloud Application Programming Model（CAP）：概要およびデモ - Part 1Introduces SAP Cloud Application Programming Model as an open, opinionated framework that shoulders OData plumbing and database-specific code so a domain is modelled once in CDS, then builds a small bookshop project to show it: @sap/cds-dk's cds init scaffolds the project, cds watch serves it locally with live reload against an in-memory SQLite database, and a CatalogService projects a CDS domain model seeded from CSV files. The result is read as an OData service in the browser and exercised further through a Postman collection, with the optional @sap/vscode-cds extension noted for CDS syntax highlighting and completion in VS Code.rasai, published 2020-12-31