Creating CDs View in SAP ABAP: A Step-by-Step Guide

How To Create Cds View In Sap Abap

This article provides a step-by-step guide on how to create a CDS view in SAP ABAP. It will walk you through the process of creating a CDS view, explaining each step along the way. By following this guide, you will gain a clear understanding of how to create and utilize CDS views in your SAP ABAP development projects.

What is SAP CDS?

SAP CDS stands for SAP Core Data Services. SAP CDS is an infrastructure for data modelling that enables data models to be defined and consumed on the database server rather than the application server. This helps users leverage SAP HANA’s powerful in-memory database and fulfil the requirement for fast, real-time performance by performing maximum operations at database level (think resource-consuming calculations, aggregations and string operations), enabling users to retrieve data fast, cutting down on application execution time. Developers use SAP CDS to create the underlying data model that application services expose to UI clients as SAP CDS Views.

What are SAP CDS Views?

Core Data Service (CDS) Views are virtual data models of SAP HANA which allows direct access to underlying tables of the HANA database. SAP CDS Views came into being with SAP’s new programming model. SAP CDS Views aim to push logic from the application server to the client-side and database. This is defined by SAP as ‘Code -to-Data’ or ‘Code Pushdown’. An SAP CDS View is what performs the ‘Code-to-Data’ or ‘Code Pushdown’. The SAP CDS View picks up the logic from the ABAP application and executes it on the database rather than the application server.

There are two types of SAP CDS Views: HANA CDS Views and ABAP CDS views. Initially, SAP CDS Views were only available in the SAP HANA environment, but now they can also be used in the SAP NetWeaver AS ABAP. This allows developers to utilize ABAP programming tools in the ABAP layer while executing the code on the database. The integration of SAP CDS with SAP NetWeaver offers advanced features such as conceptual modeling, built-in functions and extensions, and relationship definitions that go beyond what traditional data modeling tools provide.

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SAP CDS makes it easier to define and use SAP data models without worrying about the technology used for consumption. With CDS as an infrastructure layer, developers can create detailed data models known as SAP CDS Views. These views allow them to define different types of entities such as Orders, Partners, or Products and establish meaningful relationships between them. Using SQL-based DDL (Data Definition Language), CDS incorporates additional concepts to enhance its functionality.

Associations in SAP CDS Views establish connections between different elements and guide the utilization of annotations. They provide a way to represent relationships within queries using straightforward path expressions instead of complex joins.

Expressions are utilized when certain attributes of CDS need to be treated as values for aggregation purposes. They play a significant role in the data model by enabling calculations and queries.

CDS Views can be utilized by users in both ABAP and HANA environments, offering consistent syntax and functionality.

Benefits of CDS Views in SAP ABAP

CDS Views can be utilized as an OData Service to access and retrieve SAP data. They are independent of the database system used and can be executed on any SAP-supported database. CDS views function similarly to Open SQL, allowing them to be called in the application layer like SE11 views. Calculated fields, such as performing runtime calculations on two fields, are possible within CDS Views. Additionally, CDS Views support various clauses like GROUP BY, WHERE, HAVING, UNION and different types of joins including full join, cross join, inner join, outer join and right outer join. Aggregation and Numeric functions are also supported by CDS Views. Furthermore, automatic client handling is provided by CDS Views for seamless integration with applications.

Architecture Overview of Exposing CDS Views as an OData Service in SAP HANA

Retrieving information using CDS Views in SAP HANA through ODP

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CDS Views in SAP ABAP serve as a means to extract data and make it accessible outside of the system. They offer various options for retrieving data, including full datasets, initial loads, and incremental updates through the ODP Framework. This framework effectively manages the Delta Queue by using delta tokens based on timestamps.

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Creating a CDS View in SAP ABAP for replicating data

Below, we will outline the process of generating a CDS View in SAP HANA. We will then proceed to enable it for extraction and construct an SAP OData Service that allows replication of SAP data to the Cloud.

To create an SAP OData Service using CDS View in HANA, follow these steps:

1. Open Transaction SEGW and start a new project.

2. Access the Data model tab, right-click, and choose ODP Extraction.

3. Enter the required information:

– Specify the RFC Destination.

– Use the name of the created CDS View for ODP Name.

These instructions will guide you through creating an SAP OData Service with CDS View in HANA.

Click on ” Add ODP ” and provide all the details and complete the Steps.

Click on ” Generate ” to generate the Service

To register a SAP OData service, follow these steps:

1. Open the transaction /n/IWFND/MAINT_SERVICE.

3. On the next screen, enter the system Alias and Service name to retrieve the service details.

5. Return to the main screen and use the filter option to search for your registered service by its name.

8. A successfully functioning SAP OData service should display a status code of 200 as an indication of its proper operation.

After ensuring that the SAP OData service is prepared and passes the necessary tests, it can be utilized by our SAP ETL tool, such as BryteFlow SAP Data Lake Builder or any other compatible tool of your preference. This allows for the extraction of data from SAP and its subsequent loading into a cloud-based system.

Creating CDs Views in SAP ABAP

You can establish a connection between our tool and SAP CDS Views to retrieve data from various SAP applications such as SAP ECC, SAP BW, and SAP HANA. This process involves the automation of data extraction using SAP OData Services, which includes both initial data retrieval and incremental updates or deltas. Additionally, if the underlying SAP database is accessible, our ETL tool can also utilize transaction logs for extracting data. The tool automatically merges these deltas with the initial data to ensure that your SAP Data Lake or Data Warehouse remains up-to-date in real-time. Our solution eliminates the need for manual coding by automating tasks like data extraction, merging, masking, and type 2 history management without requiring any third-party tools like Apache Hudi. Once integrated into your system, the extracted data in your SAP Data Lake or Data Warehouse is readily available for use with optimal performance on platforms such as Azure SQL DB.

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Creating a CDS view: How can it be done?

Create a CDS view.Enter the data source.Use an existing CDS association.Add fields from existing associations.Add a CASE statement.Add a WHERE clause.Check your code and view your changes.Test yourself.

Creating a CDS database view in SAP: A step-by-step guide

To begin creating a CDS view in SAP ABAP, follow these steps:

1. Launch the SAP HANA studio.

2. Open the SAP HANA Development perspective.

3. Access the Project Explorer view.

4. Create a CDS-definition file that will hold the view you define in subsequent steps.

5. Define the necessary underlying CDS entities and structured types.

6. Specify a view as a projection of a CDS entity.

Creating a CD in SAP: How can it be done?

To create a CDS view in SAP ABAP, follow these steps:

1. Open Transaction SEGW and create a new project.

2. Go to the Data model section, right-click, and select ODP Extraction.

3. Click on “Add ODP” and provide all the required details to complete the steps.

A CDS (Core Data Services) view is used in SAP ABAP to define data models that can be accessed by various applications within the system. It provides a way to define complex views over database tables or other existing views.

CDS views are created using annotations and SQL-like syntax, making it easier for developers to write efficient queries without having deep knowledge of underlying database structures.

By creating CDS views, you can expose specific data sets with predefined filters or aggregations for reporting purposes or as an interface for other applications. These views can also be consumed by analytical tools like SAP Analytics Cloud or used in custom developments within SAP systems.

Overall, creating CDS views in SAP ABAP allows developers to define flexible data models that meet specific business requirements while providing optimal performance and ease of use for end-users.