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This article introduces the relevant knowledge of "how the comments in SAP ABAP are parsed in the background". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

We write SAP CDS view in ABAP Development Tool to maintain these @ annotations for views, which, like annotation, which is widely used in Java Spring, is a way to maintain metadata for development object.

As shown in the figure above, I have maintained five different annotations, and once saved, the cds view source code is sent to the ABAP background and parsed by CL_DD_DDL_HANDLER, DDL here is the abbreviation for Data Definition Language.

The ANNOTATIONS field of this class contains an inner table M_ENTRIES, which represents five parsed annotations.

All the annotation supported by cds view are in the constant defined by the ABAP API:

If_dd_ddl_annotations

For example, the if_dd_ddl_annotations= > AbapCatalog_sqlViewName in the following figure represents the note I declared in the CDS view source code: @ AbapCatalog.sqlViewName: 'znaming'

How does ABAP CDS view, which is edited by text in ABAP Development Tool, be parsed by ABAP backend? The parse_cds is parsed through line 163 of this CL_DD_DDL_HANDLER~GET_OBJDEF_FROM_SRC method.

This method is implemented on the Kernel side and can efficiently parse the CDS view source code in text format into ABAP structure:

As shown in the following figure:

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