This blog post will show you how to do this we’ll adhere to the standard development guidelines of the SAP S/4HANA VDM based on CDS views.
On the left-hand side you can see a CDS View with UI annotations and on the right-hand side is the generated FIORI app. This is demonstrated by the illustration below. On the other hand, it is a great tool to quickly generate reports with filter bars. only certain floorplans are supported, and it is not as flexible as a freestyle SAPUI5 app. The whole UI generation is driven by the CDS View and the UI annotations. By marking the CDS view with relevant annotations and the use of SAP FIORI Elements we can generate a FIORI app without writing a single line of JavaScript code. The UI annotations are an interesting case. These annotations fall into different categories: semantic (used for S4HANA Embedded Analytics), analytical (used by analytical tools like Bex, Lumira), UI annotations (used for FIORI applications).
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The classic vs code pushdown (data centric approach) comparison can be represented by the following diagram:Īs already mentioned, CDS views are created with openSQL which can be enriched with annotations. Also, in an S/4HANA system the data model has been simplified, by getting rid of tables necessary for aggregations and indexes. There is no need for pre-built aggregates and indexes since the data is organized using column stores. SAP HANA is capable of aggregating on the fly. In some cases this could cause short dumps due to memory consumption limits. For comparison – huge amounts of data had to be transferred for processing with the classic approach. This leads to performance gains and reduction of the the complex application code. SAP HANA database is optimised to complete such tasks. The rule-of-thumb is to ‘do as much as possible in the database to get the best performance’.Īnd “as much as possible” means: all expensive calculations, aggregations and string operations should be done on the database level with only the resulting sets to be transferred to the application layer. The new programming paradigm is called ‘code pushdown’ or “code to data”. With the invention of SAP HANA database and consequent introduction of ABAP CDS Views this approach has changed. The code would become complex (as its majority has been built for performance reasons) through the use of indexes and added no value to core business functions. Developers would select the required data from a database and do further processing and manipulation on the application server.
The classic SAP development approach has been to keep the unnecessary load away from the database. Why ABAP CDS Views? – Classic vs Code Pushdown approach They understand the relationship between database tables and hide the complexity from the ABAP programmer. While the data in SAP is still physically stored in transparent tables, CDS Views are an abstraction layer on top of the tables for data modelling purposes. Whether it is ABAP Programming Model for SAP Fiori, ABAP RESTful Application Programming Model, SAP Cloud Application Programming Model or S/4HANA Embedded Analytics CDS Views is the main technology used for data querying and modelling.Ĭreated using an enhanced version of openSQL syntax, ABAP CDS Views reside in the application server (data dictionary) but process the logic in the database. It is the central pillar of S/4HANA development and is used as the core technology in most of SAP’s programming models. They provide enhancements in terms of data modelling and enable improved performance when combined with SAP HANA database.ĪBAP CDS Views allow developers to create semantically rich data models which the application services expose to UI clients. In a nutshell, ABAP CDS Views is an important technology for modern application development on SAP systems and should not be overlooked.
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