CDS

Introduction

This is a collection of several slides from one of the openSAP courses, regarding the topic 'What is CDS?' and some of it's domain specific languages.

Overview

What is CDS?

• CDS stands for Core Data Services
• It is a set of domain-specific languages
• The backbone of the SAP Cloud Application Programming Model

Definition Language (CDL)

Entities

Views

Associations

Aspects

Types

Service definitions

Core Schema Notation (CSN)

• A compact JSON representation of data and service models
• Similiar to JSON Schema but goes beyond with the ability to capture full-blown entity-relationship models
• Perfect source to generate target models, such as OData/EDM interfaces, as well as persistance models for SQL or NoSQL databases

Query Language (CQL)

CDS QL is based on standard SQL with some enhancements:

Postfix projections

Path expressions

CDL-style casts

Excluding clause

Query-local mixins

Credits

• Official Documentation
• CDS
• CDL
• CSN
• CQL
• Building Applications with SAP Cloud Application Programming Model