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17_SAP_LUW.md
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## Introduction
⚠️ The concept is relevant to both ABAP Cloud and classic ABAP, but some of the statements covered in the cheat sheet and executable example are only relevant to [classic ABAP](https://help.sap.com/doc/abapdocu_latest_index_htm/latest/en-US/index.htm?file=abenclassic_abap_glosry.htm).
⚠️ The concept is relevant to both ABAP Cloud and classic ABAP, but some of the statements covered in the cheat sheet and the executable example are only relevant to [classic ABAP](https://help.sap.com/doc/abapdocu_latest_index_htm/latest/en-US/index.htm?file=abenclassic_abap_glosry.htm).
This cheat sheet provides a high-level overview of the [SAP LUW](https://help.sap.com/doc/abapdocu_latest_index_htm/latest/en-US/index.htm?file=abensap_luw_glosry.htm) concept that deals with data consistency with a focus on SAP LUW-related statements, supported by an executable example to check the syntax in action.
@@ -185,8 +185,10 @@ The following bundling techniques are available for classic ABAP. This means tha
...
"The update will be synchronous.
"The update will be synchronous no matter if you use the COMMIT WORK
"statement with or without the addition AND WAIT.
COMMIT WORK.
"COMMIT WORK AND WAIT.
```
> **💡 Note**<br>
@@ -199,6 +201,7 @@ The following bundling techniques are available for classic ABAP. This means tha
- More information:
- [SAP Help Portal documentation about RFC](https://help.sap.com/docs/ABAP_PLATFORM_NEW/753088fc00704d0a80e7fbd6803c8adb/4888068AD9134076E10000000A42189D)
- [`CALL FUNCTION ... IN BACKGROUND UNIT`](https://help.sap.com/doc/abapdocu_latest_index_htm/latest/en-US/index.htm?file=abapcall_function_background_unit.htm)
- Note the [background processing framework (bgPF)](https://help.sap.com/docs/abap-cloud/abap-concepts/background-processing-framework) as a successor technology
**Using [subroutines](https://help.sap.com/doc/abapdocu_latest_index_htm/latest/en-US/index.htm?file=abensubroutine_glosry.htm)**
- Subroutines that are no longer recommended for use can be registered for later execution.
@@ -269,7 +272,7 @@ The following concepts are related to the SAP LUW to ensure transactional consis
- At the end of an SAP LUW, all locks should be released, either automatically during the database update or explicitly when you call the corresponding dequeue function module.
- More information:
- [SAP Locks](https://help.sap.com/doc/abapdocu_latest_index_htm/latest/en-US/index.htm?file=abensap_lock.htm)
- Also note the information on the [`CL_ABAP_LOCK_OBJECT_FACTORY`](https://help.sap.com/docs/sap-btp-abap-environment/abap-environment/lock-objects) class
- Note the information on the `CL_ABAP_LOCK_OBJECT_FACTORY` class that is related to this context [here](https://help.sap.com/docs/sap-btp-abap-environment/abap-environment/lock-objects).
> **💡 Note**<br>
> RAP comes with its own implementation features to cover these concepts. See the topics [Authorization Control](https://help.sap.com/docs/SAP_S4HANA_CLOUD/e5522a8a7b174979913c99268bc03f1a/375a8124b22948688ac1c55297868d06.html) and [Concurrency Control](https://help.sap.com/docs/SAP_S4HANA_CLOUD/e5522a8a7b174979913c99268bc03f1a/d315c13677d94a6891beb3418e3e02ed.html) in the *Development guide for the ABAP RESTful Application Programming Model*.
@@ -287,17 +290,22 @@ And RAP comes with a well-defined transactional model and follows the rules of t
There are RAP-specific [ABAP EML](https://help.sap.com/doc/abapdocu_latest_index_htm/latest/en-US/index.htm?file=abenabap_eml_glosry.htm) statements for commit and rollback:
- [`COMMIT ENTITIES`](https://help.sap.com/doc/abapdocu_latest_index_htm/latest/en-US/index.htm?file=abapcommit_entities.htm) implicitly triggers `COMMIT WORK`. Furthermore, `COMMIT ENTITIES` provides RAP-specific functionality with various additions. These EML statements implicitly enforce local updates with `COMMIT WORK`, or `COMMIT WORK AND WAIT` if the local update fails. Therefore, the update is either a local update or a synchronous update, but never an asynchronous update.
- [`ROLLBACK ENTITIES`](https://help.sap.com/doc/abapdocu_latest_index_htm/latest/en-US/index.htm?file=abaprollback_entities.htm): Resets all changes of the current transaction and clears the transactional buffer. The statement triggers `ROLLBACK WORK`.
- Find more information in the [ABAP cheat sheet about EML](08_EML_ABAP_for_RAP.md).
## More Information
- [The RAP Transactional Model and the SAP LUW](https://help.sap.com/docs/SAP_S4HANA_CLOUD/e5522a8a7b174979913c99268bc03f1a/ccda1094b0f845e28b88f9f50a68dfc4.html) (Development guide for the ABAP RESTful Application Programming Model)
- [The SAP LUW in ABAP Cloud](https://blogs.sap.com/2022/12/05/the-sap-luw-in-abap-cloud/) (blog)
- [SAP LUW in the ABAP Keyword Documentation](https://help.sap.com/doc/abapdocu_cp_index_htm/CLOUD/en-US/index.htm?file=abensap_luw.htm)
- [Controlled SAP LUW](https://help.sap.com/docs/abap-cloud/abap-concepts/controlled-sap-luw) as an enhancement of the SAP LUW concept
<p align="right"><a href="#top">⬆️ back to top</a></p>
## Executable Example
After importing, find the program in ADT using search: Press `CTRL+SHIFT+A` and enter `zdemo_abap_sap_luw`. Open the program and run it by pressing `F8`.
After the import of the repository, proceed as follows:
- Find the program in ADT using the search by choosing `CTRL + SHIFT + A`.
- Enter `zdemo_abap_sap_luw` and open the program.
- Run the program by choosing `F8`.
> **💡 Note**<br>
> - The steps about how to import and run the code are outlined [here](README.md#-getting-started-with-the-examples).