What is VDM module in CDS

Question

Accepted Answer

VDM module in CDS is a virtual data model that provides a semantic layer on top of the underlying database tables.

VDM stands for Virtual Data Model.
It is used in SAP ABAP CDS (Core Data Services) to define the structure and behavior of data models.
VDM provides a semantic layer that abstracts the complexity of the underlying database tables.
It allows developers to define entities, associations, and annotations to represent business objects and relationships.
VDM modules can be used to create views, queries, and reports in SAP applications.
Example: Creating a VDM module for a sales order entity with associations to customer and product entities.

Accepted Answer

In the context of SAP's Core Data Services (CDS) modeling language, VDM stands for "Virtual Data Model". A VDM is a CDS module that defines a virtual data model, which is a logical representation of a data source, without actually defining the underlying physical tables or views that make up the data source.

A VDM module in CDS consists of one or more CDS artifacts, such as entity definitions, view definitions, and association definitions. These artifacts define the structure of the virtual data model, including the data types, relationships between entities, and other metadata. The virtual data model can be used to define views, queries, and other data access patterns, which can then be used by applications to interact with the data source.

VDMs in CDS are often used to integrate data from multiple sources into a single virtual data model, which can then be accessed by applications in a consistent and standardized way. They can also be used to provide a layer of abstraction between the application and the underlying data source, which can make it easier to manage changes to the data source without affecting the application.

VDM modules in CDS can be defined using the CDS syntax, which is a declarative language that is used to define the structure and behavior of data models. The CDS syntax includes keywords, expressions, and annotations that can be used to define entities, views, associations, and other artifacts.

Overall, VDM modules in CDS provide a powerful tool for creating virtual data models that can be used to access data from multiple sources in a consistent and standardized way, while also providing a layer of abstraction between the application and the underlying data source.

What is VDM module in CDS

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