SAP ABAP. Hands-On Test Projects with Business Scenarios. Sushil Markandeya. Kaushik Roy

Transcription

1 SAP ABAP HandsOn Test Projects with Business Scenarios Sushil Markandeya Kaushik Roy

2 Contents About the Authors About the Technical Reviewer Acknowledgments Introduction xxv xxvii xxix xxxi Chapter 1: ERP and SAP Overview 1 ERP Overview 1 Business Enterprises 1 Business Activities 3 ERP Concept, Its Evolution 3 Major Attributes of ERP Software 4 SAP Overview 7 Client Server Architecture 8 SAP NetWeaver 8 SAP Functionalities 8 SAP Implementation Overview 9 Overview of SAP Login, SAP GUI, ABAP Workbench 10 Client Code Perspectives 17 SAP IDES (Internet Demonstration & Evaluation System) Server and Usage of IDES Server for Trainings 19 Terminology Clarification 20 Conclusion 20 vii

3 Restaurant Chapter 2: ABAP Dictionary/Data Dictionary/DDIC 1 21 ABAP Dictionary: Initial Screen 21 View Table Structure Definitions of the SAP Delivered VBRK and VBRP Tables 22 DDIC Attributes 23 Metadata 24 Standardization and Uniformity 24 Open SQL and the Data Definition Language 25 DDIC Object References in ABAP Programs 25 Data Control Language 25 Search Helps/Popup Selection Lists 25 Data Types in the DDIC 26 Data Type DEC 2? Data Types CURR, QUAN 27 DDIC Object Domain 28 View or Examine an SAP Delivered Domain 28 DDIC Object Data Element 31 View or Examine an SAP Delivered Data Element 31 Domain and Data Element Relationship 34 DDIC Object Table 35 Transparent Tables 35 Domain, Data Element, and Table Relationship 35 View, Examine an SAP Delivered Table 36 Scenario for Handson Exercise on Domain, Data Element, and Table 45 Table and Table Fields 46 Entity Relationship Diagram Billing System 46 Assigning DDIC Data Types and Lengths to Table Fields 47 Summary of Data Types, Lengths, and List of Tables' Entities and Attributes 47 Creation of Domains, Data Elements, and Tables 48 Objects Naming Convention, Listing of Objects 48 Create Domains 51 viii

4 2 Create Data Elements 59 Create Tables 63 Create Data in Tables 72 Data in Table YCL_CH02_WAITM 72 Foreign Key Relationship Dialog Box Again 78 Text Tables 80 Recapitulation: Domains, Data Elements, and Tables 80 BChapter 3: ABAP Dictionary/Data Dictionary/DDIC 81 DDIC Objects Views 81 Database Views 81 Projection View 103 DDIC Objects Search Helps 107 Search Help with Custom Tables 108 Search Helps with SAP delivered Tables 117 Collective Search Help with SAP delivered Table 126 Search Help Attachments 139 Search Help with Help View 139 DDIC Tit Bits 139 Conclusion 139 Chapter 4: ABAP Language Basics 141 Introduction 141 ABAP Data Types 142 Elementary Types 142 Complex Types 144 Reference Types (Discussion Is in OOP Context) 144 Data Objects in ABAP Programs 144 Internal Data Objects 144 External Data Objects 144 Systemdefined Data Objects 145 Special Data Objects 145 ix

5 Output Assigning Output Output ABAP Program Components ABAP Editors FrontEnd Editor (New, also Called 'Source Code Mode') FrontEnd Editor (Old, also Called 'Plain Text Mode') BackEnd Editor (also Called 'Line Based Mode') 149 Common Features of the Three ABAP Editor Modes 149 ABAP Program Structure 150 Declaration Part Global Data, Selection Screens, and Local Classes 150 Container for Processing Blocks 151 Calling Processing Blocks 151 ABAP Statement Structure 151 Comments 151 ABAP Statements 152 ABAP Statements and Keywords 152 First ABAP Program 154 ABAP Program a Few System Fields 156 System Fields 156 Internal Data Objects (Elementary) Declarations 159 Variables 159 ABAP Program: Declare Internal Data Objects ABAP Program: Declare Internal Data Objects Constants Variables (with VALUE) Literals 163 Elementary Data Objects Elementary Data Objects Values or Data Movement 163 Assignment or Movement with Offsets and Lengths (Types C, D, N and T) 164 Structured Data Objects, Own Data Types 166 Structured Data ObjectABAP Program: Access Individual Fields 166 Structured Data Object: Access Complete Structure 167 Structured Data Object in an ABAP Program: User Defined Type in ABAP Program, Access Complete Structure 168 User Defined Type in DDIC 169 x

6 STARTOFSELECTION WHILE ENDDO ENDWHILE A A Source, Structured Data Object in an ABAP Program Referring to DDIC Type Group 171 Structured Data Objects: MOVE Statement Destination Not Identical 172 Date, Time Arithmetic 174 Date Arithmetic ABAP Program 174 Arithmetic Numerical Operations 176 Basic Arithmetic Operations/Operators 176 Functions Common to All Numeric Data Types 177 Floating Point Functions 177 Arithmetic Operations on Structures 178 String Operations 178 An ABAP Program Demonstrating TRANSLATE. UPPER CASE/LOWER CASE is Coded 178 An ABAP Program Demonstrating CONCATENATE \s Coded 180 An ABAP Program Demonstrating SPLIT, the Reverse of CONCATENATE is Coded 181 An ABAP Program Demonstrating the Function STRLENQ is Coded 183 An ABAP Program Demonstrating the Statement CONDENSE D Coded 183 Program Internal Flow Control 184 Conditions, Conditional Operators 185 The IF Condition Statement 186 Conditional Branching with CASE 187 The Unconditional Loops: DO 187 The Conditional Loops: 188 Determine Attributes of Data Objects 190 Conclusion 195 Chapter 5: WRITE Statement (Classical Reporting) 197 WRITE Statement 197 WRITE Statement: Handson Exercise Simple Customer List 199 WRITE Statement: Handson Exercise Simple Customer List with Standard Page Header or List Headers 203 An Introduction to Events in ABAP Programs 208 Event 208 xi

7 3.X Features Simple Simple List Getting WRITE Statement: Handson Exercise Simple Customer List with the Nonstandard Page Header 209 TOPOFPAGE Event 209 Text Element Component Text Symbols 209 Source Program, the Program Flow 211 WRITE Statement: Handson Exercise Customer List with the Nonstandard Page Header, Footer 213 WRITE Statement: Handson Exercise Customer List Using COLOR Options 218 WRITE Statement: Handson Exercise Simple Customer List with Fields Enclosed in Boxes 221 WRITE Statement: Handson Exercise of Billing Documents of a Specified Company Code 224 Text Symbols 229 WRITE Statement: Handson Exercise Part of Output on a Single Page, Not Splitting between Pages 232 Scenario: 232 WRITE Statement: Handson Exercise Freeze Columns on the Left: SET LEFT SCROLLBOUNDARY 236 WRITE Statement: Miscellaneous Features, Statements 239 WRITE Statement 239 WRITE Statement Associated Statements 241 Output Formatting Options 242 Conclusion Chapter 6: Internal Tables DDIC Object: Structure Internal Tables Declarations Internal Tables Mode of Declarations HandsOn Exercise: List of Billing Documents of a Specified Company Code 251 HandsOn Exercise: Customer Code Wise List of Billing Documents of a Specified Company Code with Totals for Every Customer and a Grand Total 256 xii

8 Update/Change Update Update Continued Internal Table Declarations 262 Internal Tables 4.X Mode of Declarations 262 Create DDIC Internal Table Type 267 Internal Tables 4.X Mode of Declarations Continued 270 HandsOn Exercise: Split a String, Get Output in Nonstructured Internal Table 271 SORT Statement 272 APPEND Statement 273 HandsOn Exercise: Internal Table Text Sort (Use APPEND to Populate Internal Table) 273 HandsOn Exercise: Customer Wise Sales Summary of a Specified Company Code Using the COLLECT Internal Table Statement on a Standard Table 276 Output 276 Inputs 276 COLLECT Statement 277 COLLECT Statement Operation 277 HandsOn Exercise: Customer Wise Sales of a Specified Company Code Using COLLECT Internal Table Statement on a Sorted Table 282 HandsOn Exercise: READ with Index (Retrieve a Row Given a Row Number) 283 HandsOn Exercise: READ...WITHKEY... (Retrieve a Row Given Key Field Values) 286 HandsOn Exercise: INSERT...INDEX... (Insert a Row at a Specified Row Position) 291 NonIndex INSERT Statement 294 Delete Data from Internal Tables 294 DELETE Single Rows 294 DELETE Multiple Rows 294 HandsOn Exercise: Delete Adjacent Duplicates 295 Scenario 295 MODIFY Statement MODIFY Statement MODIFY Statement Existing Rows in Internal Tables 297 or Change a Single Row 298 or Change Multiple Rows 298 HandsOn Exercise: MODIFY Single Row 299 HandsOn Exercise: MODIFY Multiple Rows 302 xiii

9 Fields Use Use HandsOn Exercise: DESCRIBE TABLE Statement, Function: LINES() 305 HandsOn Exercise: Produce Multilevel Summary Using Internal Table Control Level Processing Scenario Input Data Identification 308 Database View 309 Output Main Body Layout 3"I0 Control Levels 311 Mapping Application of Control Levels to Scenario 312 SUM statement 313 Extra Processing 313 A Note on the Data Sources Program YCL_CH06_ITAB14 visavis the Program YCL_CH06_ITAB HandsOn Exercise: Initialize Internal Tables Rows or Complete Data 319 Clear 319 Refresh 319 Free 319 MOVE, Assign, Copy, Internal Tables 321 Conclusion 321 Chapter 7: Modularization 323 Introduction 323 Macros 324 Subroutines 324 HandsOn Exercise: Modify Chapter 44 Program on DESCRIBE FIELD Macro and Subroutine to Make It an Efficient Program 328 HandsOn Exercise: Modify Chapter 44 Program on DESCRIBE FIELD Subroutine Only 333 HandsOn Exercise: Subroutine with an Internal Table as Parameter 336 HandsOn Exercise: Subroutine with a Structure as Parameter 338 HandsOn Exercise: List of Icons in SAP GUI Environment Enclosed in Boxes Using Macro and Subroutine 340 xiv

10 HandsOn Conversion Continued) Messages Maintenance and Issuing in ABAP Workbench 345 Message Text Maintenance 345 Message Issuance 347 Message Statement Syntaxes 348 Message Statement Additional Options 349 HandsOn Exercise: Message Issuance 349 Function Modules, INCLUDE Programs 350 Function Modules Introduction 350 Examine or View an SAP Delivered Function Module: SPELL_AMOUNT 350 HandsOn Exercise: CALL Function Module SPELL_AMOUNT 358 Link, Relationship between Function Group & Function Module Source Code (Examine/View Function Module SPELL_AMOUNT 362 HandsOn Exercise: Create a Function Module to Split a String without breaking a Word 367 Proposed Function Module Interface: 369 Tasks to Create, CALL, and Test the Proposed Function Module 369 Create a Function Group 370 Special Function Modules Routines 381 Conversion Routines Background 381 Conversion Routines Assignment 381 Conversion Routine Attributes 382 Conversion Routine HandsOn Exercise: Conversion Routine Exercise: 2 and INCLUDE Programs 386 Function Modules Tidbits 386 List of a Few Function Modules 387 Conclusion 389 XV