CDS Annotations

• Reusable and unified view model for all use cases
•  Annotations enabling flexible usage in different contexts
•  Efficient development

Enrich CDS data models with additional metadata. Annotations begin with @

Kinds of Annotations

• AbapCatalog Annotations
• AccessControl Annotations
• Analytics Annotations
• AnalyticsDetails Annotations
• ClientDependent Annotations
• Consumption Annotations
• DataAging Annotations
• DefaultAggregation Annotations
• EndUserText Annotations
• EnterpriseSearch Annotations
• Environment Annotations
• Hierarchy Annotations
• MappingRole Annotations
• ObjectModel Annotations
• OData Annotations
• Search Annotations
• SearchIndex Annotations
• Semantics Annotations
• UI Annotations
• VDM Annotations

AbapCatalog Annotations

Define technical settings of CDS entities in the ABAP dictionary.

• AbapCatalog.sqlViewName: Database view in ABAP dictionary that is generated at activation
• AbapCatalog.sqlViewAppendName: Database view for CDS extension
• AbapCatalog.buffering.numberofkeyFields: Number of key elements for buffering generic areas (Default 000)

• AbapCatalog.buffering.status :

1. #ACTIVE: SAP Buffering active
2. #SWITCHED_OFF: SAP buffering allowed but not active (Default)
3. #NOT_ALLOWED: SAP buffering not allowed.

• AbapCatalog.buffering.type:

1. #SINGLE: Buffering type- single records
2. #GENERIC: Buffering type- generic area
3. #FULL: Buffering type- full
4. #NONE: Buffering type- none (Default)

• AbapCatalog.compiler.compareFilter: (Default: true)

1. true : the filter conditions of the path expressions of the view are compared. If the same filter condition occurs, the associated join expression is only evaluated once.
2. false : a separate join expression is created and evaluated for each filter condition.

ClientDependent Annotation

Defines the client handling when Open SQL is used to access a CDS entity
• ClientDependent: (Default: true)
• true : The CDS view is client-specific. The view fields of the CDS entity do not cover a client
column, from the perspective of an ABAP program. When accessed using SELECT,
automatic client handling is performed.
• false : The CDS view is a cross-client view. No automatic client handling is performed.

EndUserText Annotations

Enable an intuitive consumption of the data model in User Interfaces
EndUserText.label:
Defines a human-readable text that is displayed besides input fields or as column headers.
EndUserText.quickInfo:
Defines a human-readable text that provides additional information compared to the label text. The quickInfo element is used for accessibility hints or the mouse over function.

Example

@AbapCatalog.sqlViewName: ‘S4HCDS_CONN3ANN‘
@AbapCatalog.compiler.compareFilter: true
@AbapCatalog.Buffering.type: #GENERIC
@AbapCatalog.Buffering.numberOfKeyFields: 1
@AbapCatalog.Buffering.status: #ACTIVE
@EndUserText.label: 'Flight Connection with ABAP Annotations‘
@ClientDependent: true
define view s4hcds_Connection3_Annotations as select from spfli
{
// Projection list
}