ABAP RESTful Application Programming Model
Description
The ABAP RESTful application programming model (RAP) is the cornerstone of modern development for SAP-get on the cutting edge with this guide! Develop applications from the ground up, from data modeling with CDS to interface generation with SAP Fiori elements. Walk through concrete use cases, including managed and unmanaged scenarios, and then adapt your applications to the SAP BTP, ABAP environment. You're on your way to working with RAP!
In this book, you'll learn about:
a.The Programming Model
Master the building blocks of the model. Understand REST architecture, work with CDS view entities, implement behaviors, and more. Learn about new features such as the business object interface and extensibility.
b.End-to-End Application Development
Develop applications for SAP S/4HANA and SAP BTP, step by step. Start by building your data model, and then create behavior definitions, implement functions, define business services, and generate your user interface.
c.Practical Scenarios
Apply RAP to suit your development needs. Create an application in a custom managed scenario, and then see how to integrate standard SAP functions. If you want to reuse source code, learn to adapt legacy applications for RAP in an unmanaged scenario.
Highlights include:
1)Application development
2)Managed and unmanaged scenarios
3)Core data services (CDS)
4)Behavior definition
5)Entity manipulation language (EML)
6)Behavior implementation
7)Business services
8)Business object extensibility
9)SAP Fiori elements
10)SAP BTP, ABAP environment
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Content
... Foreword ... 17
... Preface ... 19
... Acknowledgments ... 22
PART I ... Basic Concepts and Technical Components ... 23
1 ... Introduction to the ABAP RESTful Application Programming Model ... 25
1.1 ... What Is the ABAP RESTful Application Programming Model? ... 26
1.2 ... Architecture and Concepts of the ABAP RESTful Application Programming Model ... 42
1.3 ... Development Objects of the ABAP RESTful Application Programming Model ... 48
1.4 ... ABAP Development Tools as a Development Tool ... 52
1.5 ... Quality Attributes of the ABAP RESTful Application Programming Model ... 54
1.6 ... Availability of the ABAP RESTful Application Programming Model ... 57
1.7 ... The Role of RAP in the ABAP Cloud Development Model ... 60
2 ... Core Data Services: Data Modeling ... 65
2.1 ... What Are Core Data Services? ... 66
2.2 ... Structure and Syntax of CDS ... 69
2.3 ... Associations ... 83
2.4 ... Annotations ... 86
2.5 ... Access Controls ... 91
2.6 ... Extensibility of CDS Entities ... 96
2.7 ... Additional CDS Functionality ... 103
2.8 ... Virtual Data Model ... 110
2.9 ... CDS Language Elements for Modeling Business Objects ... 114
3 ... Behavior Definition ... 119
3.1 ... What Is a Behavior Definition? ... 119
3.2 ... Editing a Behavior Definition in ABAP Development Tools ... 131
3.3 ... Implementation Types ... 139
3.4 ... Strict Mode ... 144
3.5 ... Entity Behavior Definition ... 145
3.6 ... Defining a Behavior Pool ... 146
3.7 ... Numbering Assignment ... 148
3.8 ... Field Properties ... 152
3.9 ... Field Mappings ... 155
3.10 ... Standard Operations for a CDS Entity ... 157
3.11 ... Specific Operations for a CDS Entity ... 160
3.12 ... Concurrency and Locking Behavior ... 173
3.13 ... Internal Business Logic ... 177
3.14 ... Authorization Checks ... 187
3.15 ... Draft Handling ... 192
3.16 ... Events ... 204
3.17 ... Overarching Concepts ... 207
4 ... Entity Manipulation Language: Accessing Business Logic ... 215
4.1 ... Data Types ... 216
4.2 ... EML Operations ... 219
4.3 ... Using the EML Outside of Behavior Implementations ... 229
4.4 ... Concrete Use Cases ... 232
5 ... Behavior Implementation ... 239
5.1 ... Business Object Provider API ... 239
5.2 ... Runtime Behavior of the ABAP RESTful Application Programming Model ... 240
5.3 ... Interfaces for the Interaction Handler and the Save Handler ... 243
5.4 ... Interaction Handler ... 244
5.5 ... Save Handler ... 265
5.6 ... Events ... 274
6 ... Business Services ... 281
6.1 ... Projection Layer ... 282
6.2 ... Service Definition ... 285
6.3 ... Service Binding ... 285
6.4 ... Testing Business Services in SAP Gateway Client ... 289
6.5 ... Testing UI Services Using the SAP Fiori Elements Preview ... 292
6.6 ... Business Object Interfaces ... 293
7 ... Extensibility of Business Objects ... 301
7.1 ... Introduction to the Extensibility Concept ... 301
7.2 ... Extension Options ... 305
7.3 ... Extending a Standard Business Object ... 320
8 ... Application Interfaces and SAP Fiori Elements ... 347
8.1 ... Development Tools ... 347
8.2 ... SAP Fiori Elements UIs for RAP Applications ... 351
PART II ... Practical Application Development ... 383
9 ... Use Cases ... 385
9.1 ... Areas of Use for the ABAP RESTful Application Programming Model ... 385
9.2 ... Implementation Types ... 386
9.3 ... Decision Criteria for Selecting the Implementation Type ... 387
10 ... Managed Scenario: Developing an Application with SAP Fiori Elements ... 391
10.1 ... Description of the Use Case ... 392
10.2 ... Building the Data Model ... 392
10.3 ... Creating Behavior Definitions ... 405
10.4 ... Defining a Business Service ... 411
10.5 ... Creating an SAP Fiori Elements User Interface ... 416
10.6 ... Enrichment with a Determination ... 424
10.7 ... Enrichment with a Validation ... 428
10.8 ... Enrichment with an Action ... 432
10.9 ... Generation and Deployment of the App ... 434
10.10 ... File Upload ... 442
11 ... Managed Scenario with Unmanaged Save: Integrating an Existing Application ... 445
11.1 ... Description of the Use Case ... 446
11.2 ... Building the Data Model ... 449
11.3 ... Creating a Behavior Definition ... 460
11.4 ... Implementing the Create Purchase Order Function ... 463
11.5 ... Implementing the Delete Purchase Order Function ... 487
11.6 ... Defining Business Services ... 492
11.7 ... Implementing Authorization Checks ... 495
11.8 ... Creating an SAP Fiori Elements User Interface ... 500
12 ... Unmanaged Scenario: Reusing Existing Source Code ... 505
12.1 ... Description of the Use Case ... 505
12.2 ... Description of the Existing Application ... 507
12.3 ... Extending the Data Model ... 513
12.4 ... Creating a Behavior Definition ... 519
12.5 ... Creating a Behavior Implementation ... 523
12.6 ... Defining a Business Service ... 537
13 ... Special Features in the Cloud Environment ... 541
13.1 ... Basic Technical Principles ... 542
13.2 ... Identity and Access Management ... 548
13.3 ... Deploying SAP Fiori Apps and Assigning Authorizations ... 551
13.4 ... Consuming Business Services ... 558
... Bibliography ... 563
... The Authors ... 565
... Index ... 567