If youre developing ABAP applications, you need CDS expertise. This book is your all-in-one guide, updated for SAP S/4HANA 2023! Start by learning to create and edit CDS views. Walk through CDS syntax and see how to define associations and annotations. Further refine your model by implementing access controls, service bindings, and table functions. Understand the CDS-based virtual data model, and then follow step-by-step instructions to model analytical and transactional applications. From modeling to testing to troubleshooting, this is the only book you need!In this book, youll learn about:a. Creating Data Models Create data models using CDS! Learn the ins and outs of CDS view syntax, from key fields to joins to data types and beyond. Define associations to establish relationships, use annotations to enrich your logic, implement conditional logic to control access, and more.b. Modeling Applications See how CDS views support a new application architecture. Model analytical applications by defining analytical views and queries; then use CDS for transactional applications based on the ABAP RESTful application programming model. c. Extending, Testing, and TroubleshootingPut the finishing touches on your CDS data models. Extend and enhance CDS views and transactional models, develop automated tests using the test double framework, and troubleshoot common problems. Highlights include:1) Data modeling 2) Application modeling3) Associations4) Annotations5) Access controls6) Business services 7) SAP HANA functions8) Virtual data model9) Analytical and transactional applications10) Hierarchies11) Extensibility12) Testing and troubleshooting

... Structure of the Book ... 19 ... Acknowledgments ... 22 1.1 ... Define the Data Model of the Application ... 24 1.2 ... Implement the Data Model of the Application ... 26 1.3 ... Summary ... 52 2.1 ... Overview of CDS Models ... 54 2.2 ... Overview of CDS View Syntax ... 58 2.3 ... Key Fields ... 61 2.4 ... Cast Operations ... 62 2.5 ... Typed Literals ... 64 2.6 ... Simple Types ... 66 2.7 ... Case Statements ... 68 2.8 ... Session Variables ... 69 2.9 ... Client Handling ... 71 2.10 ... Select Distinct Statements ... 72 2.11 ... Union Views ... 73 2.12 ... Intersect and Except Statements ... 79 2.13 ... Joins ... 81 2.14 ... SQL Aggregation Functions ... 87 2.15 ... Projection Fields ... 89 2.16 ... Parameters ... 91 2.17 ... Reference Fields ... 96 2.18 ... Conversion Functions for Currencies and Quantity Units ... 99 2.19 ... Provider Contracts ... 102 2.20 ... Entity Buffer Definitions ... 104 2.21 ... Summary ... 106 3.1 ... Define Associations ... 108 3.2 ... Expose Associations ... 111 3.3 ... Model Compositional Relations ... 111 3.4 ... Model M:N Relations ... 114 3.5 ... Project Associations ... 117 3.6 ... Use Associations in CDS Views ... 118 3.7 ... Use Associations in ABAP Code ... 129 3.8 ... Summary ... 129 4.1 ... Annotation Definitions ... 132 4.2 ... Effects of Annotations ... 143 4.3 ... Propagation Logic for Annotations ... 145 4.4 ... Metadata Extensions ... 155 4.5 ... Active Annotations ... 158 4.6 ... Summary ... 160 5.1 ... Fundamentals of Access Controls ... 162 5.2 ... Mode of Action of Access Controls ... 166 5.3 ... Implementation Patterns for Access Controls ... 171 5.4 ... Test Access Controls ... 207 5.5 ... Summary ... 210 6.1 ... Projection Views ... 212 6.2 ... Service Definitions ... 216 6.3 ... Service Bindings ... 221 6.4 ... Testing Business Services ... 230 6.5 ... Summary ... 233 7.1 ... Implementation of a CDS Table Function ... 236 7.2 ... Application Scenarios ... 244 7.3 ... Improve Performance and Avoid Errors ... 245 7.4 ... Summary ... 247 8.1 ... Application Architecture in SAP S/4HANA ... 250 8.2 ... Field Labels ... 253 8.3 ... Field Semantics ... 257 8.4 ... Foreign Key Relations ... 262 8.5 ... Text Relations ... 267 8.6 ... Composition Relations ... 270 8.7 ... Time-Dependent Data ... 272 8.8 ... Summary ... 274 9.1 ... Why a Virtual Data Model? ... 276 9.2 ... SAP Object Types and Object Node Types ... 277 9.3 ... Categories of CDS Entities in the Virtual Data Model ... 280 9.4 ... Naming in the Virtual Data Model ... 285 9.5 ... Basic Interface View for the Sales Order ... 288 9.6 ... Tips for Finding Virtual Data Model Views ... 295 9.7 ... Summary ... 301 10.1 ... Analytics in SAP S/4HANA ... 303 10.2 ... Analytical Views ... 305 10.3 ... Analytical Queries ... 325 10.4 ... Analytical Infrastructure ... 356 10.5 ... Summary ... 359 11.1 ... Transactional Applications ... 362 11.2 ... Transactional Infrastructure in SAP S/4HANA ... 363 11.3 ... Transactional Object Models ... 366 11.4 ... Behavior Definitions ... 372 11.5 ... Transactional Projection Object Models ... 467 11.6 ... Define Interface Behavior Definition ... 477 11.7 ... Define Projection Behavior Definition ... 484 11.8 ... Runtime Orchestration ... 492 11.9 ... SAP Fiori and OData Consumption ... 498 11.10 ... SAP Event Mesh and Local Event Handlers ... 510 11.11 ... Summary ... 513 12.1 ... Hierarchy Categories and Basics ... 516 12.2 ... Annotation-Based Parent-Child Hierarchies ... 517 12.3 ... CDS Hierarchies ... 526 12.4 ... Summary ... 548 13.1 ... Modeling Value Helps ... 550 13.2 ... Free-Text Search Functionality in OData Services ... 570 13.3 ... Enterprise Search Functionality ... 578 13.4 ... Summary ... 583 14.1 ... Stability Contracts ... 586 14.2 ... Lifecycle of Development Objects ... 590 14.3 ... Deprecation of Development Objects ... 592 14.4 ... Use of CDS Models and Supported Capabilities ... 594 14.5 ... Summary ... 598 15.1 ... Solution Variants and ABAP Language Versions ... 600 15.2 ... Stable CDS Extensions ... 602 15.3 ... Extensions of Transactional Models ... 615 15.4 ... Summary ... 628 16.1 ... Test Logic of Data Selections ... 631 16.2 ... Test Logic of Transactional Applications ... 658 16.3 ... Summary ... 670 17.1 ... Performance Aspects ... 671 17.2 ... Pitfalls ... 687 17.3 ... Troubleshoot Implementations of CDS Models ... 698 17.4 ... Troubleshoot Activation Issues ... 706 17.5 ... Examine ABAP RESTful Application Programming Model Applications ... 711 17.6 ... Summary ... 714 A ... CDS Annotation Reference ... 717 B ... Migration to the ABAP RESTful Application Programming Model ... 729 C ... The Authors ... 737