ABAP CDS Views Series - Part 9: Hierarchies, Recursive Structures, and Tree-Based Data Modeling in SAP S/4HANA

Based on the provided content, here's a summary of how to implement hierarchical data structures using CDS views in SAP S/4HANA:

1. Define Base View: Create an initial view that represents your base entity (e.g., ZCDS_PRODUCT_CATEGORY). This view should include all necessary fields and relationships.

2. Create Self-Referencing Association:

   • Define a self-referencing association in the base view to link each record with its parent.
   • Example annotation:

     abap
      
     1@AssociationName: 'ParentCategory'
     2@EndType: 'ZCDS_PRODUCT_CATEGORY'
     3@Semantics: 'Hierarchical'
     4Association:
     5  Parent: { Path: 'ParentId' }

3. Create Hierarchy View:

   • Use the HIERARCHY keyword to create a view that traverses the hierarchical relationship.
   • Example:

     abap
      
     1DEFINE ZCDS_PROD_CAT_HIERARCHY AS SELECT FROM ZCDS_PRODUCT_CATEGORY {
     2  CategoryId,
     3  ParentId,
     4  Name as CategoryName,
     5  _ParentCategory.ParentId as ParentCategoryId,
     6  HIERARCHY(_ParentCategory) as

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