Dear SAPLearners, in this blog post i will discuss about different ways to create and model an OData service in SEGW(Gateway Builder) and Eclipse ABAP Development Tools.
SEGW(Gateway Builder) Tool
There are 3 different approaches to create and model an OData service in gateway builder(SEGW). They are
1. ABAP code-based implementation
This is most used approach in creating OData services. In this approach we define the model and write the business data retrieval logic in run-time generated artifact DPC_EXT class.
Also Read: How to create OData Service using code-based implementation.
Before discussing the other approaches i would like to introduce you to the SADL (Service Adaptation Description Language), as the other 2 approaches depend on this framework.
Service Adaptation Description Language(SADL)
SADL is an ABAP technology that enables the consumption of entity relationship-like ABAP data models in various scenarios with a common development experience based on a model-driven approach. – SAP definition
SADL model is a data model like CDS views, DDIC tables (or) views and BOPF.
In short, SADL framework allows us to create OData service based on a model-driven approach using ABAP CDS Views.
Now, lets continue with other approaches
2. Mapping Editor
In SEGW gateway builder, you can map an ABAP CDS Views as a data source to the entity type properties.
Also Read: How to create OData Service in SEGW Using the Mapping Editor
With this approach, the business logic is available in ABAP CDS View. The SADL framework provides a standard, optimized implementation of the OData service to retrieve data.
You can map as many as ABAP CDS views in a single SEGW OData service.
3. Referenced Data Source
In SEGW gateway builder, you can reference an ABAP CDS Views as a data source. Each entity type in OData service model corresponds to 1 ABAP CDS view.
Also Read: How to create OData Service based on Referenced Data Sources
Along with these 3 approaches we have another approach, that is using annotation in ABAP CDS views.
ABAP Development Tools(Eclipse-based IDE)
4. Using Annotation
In this approach we can create OData service directly on ABAP CDS View in Eclipse ABAP Development Tools using annotation @OData.publish: true
Also Read: How to create OData service on ABAP CDS view using Annotation
Now we know 4 different ways to create OData service and different tools cover different use cases. Below is the table which compares different approaches.
Comparing Different Approaches
Congrats.! you have successfully learned 4 different ways to create OData Service using SEGW and ABAP Development Tool.
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