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Introduction to ABAP/4 Programming for SAP Book

Introduction to ABAP/4 Programming for SAP
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Introduction to ABAP/4 Programming for SAP, This revised edition provides a learn-by-doing tutorial with real-world business examples for programming in today's most powerful client-server environment. From the basics of tables, displays, loops, and conditional operators to tuning and troubleshooti, Introduction to ABAP/4 Programming for SAP
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  • Introduction to ABAP/4 Programming for SAP
  • Written by author M. de Bruyn, Robert Lyfareff
  • Published by Premier Press, 1998/07/01
  • This revised edition provides a learn-by-doing tutorial with real-world business examples for programming in today's most powerful client-server environment. From the basics of tables, displays, loops, and conditional operators to tuning and troubleshooti
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Introduction
Part I: ABAP/4 Basics
1. Data Types and Definitions
In This Chapter
Building ABAP/4 Statements
Commenting Your Code
Improving Statement Readability with the Colon Notation
Defining Programs (REPORT)
Using Variables
Variable Data Types
Defining Variables (DATA)
Grouping Variables into Records
Defining New Data Types (TYPES)
Defining Constant Data Elements (CONSTANTS)
Using Runtime Parameters
Using Field Symbols
Assigning Values to Variables
Using MOVE to Assign Variables
Data Type Conversion During Assignments
Summary
2. Displaying and Printing Data
In This Chapter
Setting Up the Page (REPORT)
General Features of the WRITE Statement
Outputting Field Names (Variables)
Outputting Groups of Text and Data Fields
Column Positioning
Dynamic Positioning and Output
Breaking to a New Line (Inserting Carriage Returns)
Controlling the Output Length
Default Data Alignment
Using Text Elements
Advanced Features of the WRITE Statement
Masking the Output (USING EDIT MASK and USING NO EDIT MASK)
Suppressing Blanks (NO-ZERO)
Suppressing Number (+/-) Signs (NO-SIGN)
Choosing a Date Format
Displaying Currency (CURRENCY)
Aligning Fields Vertically (UNDER)
Closing Gaps Between Fields (NO-GAP)
Specifying Decimal Places (DECIMALS)
Specifying Justification (LEFT-JUSTIFIED, CENTERED, RIGHT-JUSTIFIED)
Transferring Data with a Specified Format (WRITE ... TO)
Inserting Horizontal Lines (ULINE)
Inserting Blank Lines (SKIP)
Controlling Horizontal Positioning (POSITION)
Displaying Messages (MESSAGE)
Boldfacing (INTENSIFIED)
Changing Colors (COLOR)
Restoring the Default Settings (RESET)
Summary
3. Manipulating Data
In This Chapter
Working with Numeric Data
Performing Math (COMPUTE)
Controlling Precision in Expressions
Manipulating Character Data
Defining Substrings with Offsets
Using Variable Offsets to Define Substrings
Other Text-Processing Commands
Working with Date Variables
Using Time Variables
Manipulating Field Symbols
Assigning a Variable to a Field Symbol (ASSIGN)
Summary
4. Using Conditional Operators
In This Chapter
The CASE Statement
Using IF with Logical Operators
Using Comparison Operators
Comparing Non-Numeric Values
Using Equal/Not Equal Operators
Determining Whether Values Have Changed (IS INITIAL)
Determining Whether a Value is Included in a Range (IS BETWEEN)
Using the NOT Operator
Comparing Character Fields (CO, CA, CS, CP)
Nesting Statements
Summary
5. Using the Looping Commands
In This Chapter
Using the DO Loop Command
Exiting the Loop
When to Use DO Loops
Nesting DO Loops
Using the WHILE Loop
Nesting WHILE Loops
Using the LOOP Statement
When to Use the LOOP Command
Looping Selectively Through Internal Tables
Summary
6. Working with Internal Tables
In This Chapter
Understanding the Structure of an Internal Table
Defining the Table
Determining the Number of Records
Using Field Strings
Including Structures
Manipulating Data in Tables
Moving Data into a Table
Appending Data to a Table (APPEND)
Modifying Records (READ and MODIFY)
Deleting Records (DELETE)
Collecting Records (COLLECT)
Clearing the Header Record (CLEAR)
Refreshing the Table (REFRESH)
Reading Internal Tables
Other Table Commands
Determining Table Properties (DESCRIBE)
Sorting Records with the SORT Command
Looping with LOOP AT and LOOP AT WHERE
Using ON CHANGE OF Inside a Loop
Summary
7. Working with the Data Dictionary
In This Chapter
Data and Structure Definitions
Tables
Views
Organizing Your Data
Domains
Data Elements
Fields
Data Dictionary Tools
General Table Display (SE16 and SE17)
Displaying Fields, Data Elements, and Domains (SE15 and DI03)
Summary
Part II: Accessing the Database
8. Using SAP SQL to Access Database Tables
In This Chapter
Using SQL to Access Tables and Views
Using SQL with Transactions
Updating Tables (UPDATE)
Inserting Data (INSERT)
Deleting Rows (DELETE)
Advanced Techniques in R/3 v3.x
Summary
9. Working with External Files
In This Chapter
Data Mapping
Establishing the Path and Filename
Opening the File (OPEN DATASET)
Adding a System Message (MESSAGE)
Sending a Command to the Server (FILTER)
Writing the Data to the Server (TRANSFER)
Reading the Data from the Data File (READ)
Closing the File (CLOSE DATASET)
Summary
10. Advanced Data Output
In This Chapter
Processing Events in ABAP/4
Hiding Field Contents with HIDE
Using Field Groups as an Alternative to Internal Tables
Summary
11. Adding Subroutines to Your Program
In This Chapter
Executing Subroutines (PERFORM)
Defining Subroutines (FORM)
Understanding the Scope of Local and Global Variables
Form Examples
Summary
12. Using Function Modules
In This Chapter
Using the Function Modules Screen
Creating a Custom Function Module
Using Function Modules in ABAP Code
Some Useful Funciton Modules
Summary
13. Working with Logical Databases
In This Chapter
Advantages of Logical Databases
Using the GET Event to Retrieve Data
Limiting Data with Logical Database Parameters
Summary
14. Writing a Report
In This Chapter
Data Selection
Output
The Complete Program
Summary
Part III: Advanced Technical Issues
15. Writing with Data Extract
In This Chapter
Steps in a Data Extract
Determining the Data to Be Extracted
Extracting the Data
Writing the Data to a File
Transferring the File to the Target System
Example Extracts
Summary
16. Writing a BDC Program
In This Chapter
Steps in a BDC Session
Identifying Screens in a Transaction
Building the BDC Table
Submitting the BDC Table
Example BDC Sessions
Summary
17. Working with SAP Security and Authorizations
In This Chapter
The SAP Security Model
Creating Authorization Objects
Using the Authority-Check Command
Summary
18. ABAP/4 Workbench (Debugger)
In This Chapter
The ABAP/4 Debugger
Defining the Debugger's Screen
General Commands
Display List
Watchpoints
Internal Tables
Breakpoints
Tips and Techniques
Summary
19. Performance Analysis
In This Chapter
The ABAP/4 Runtime Analysis Tool
The SQL Trace
Summary
20. Performance Tuning
In This Chapter
Using SELECT*
Using the Primary Key
Using CHECK Statements
Using Tables
Using the MOVE Statements
Looping
Choosing Internal Tables Versus Field Groups
Using Batching Versus Online Programs
Summary
21. Integrating the Web with R/3
In This Chapter
ITS (Internet Transaction Server)
SAP@Web Studio (Web Development Tool)
SAP Web Reporting
Web-Enabling Your Reporting Tree
Adding HTML Tags to Your SAP Web Application
Summary
Part IV: Appendixes
Appendix A: Using the ABAP/4 Editor
Managing ABAP/4 Programs
Using the Editor to Edit Programs
Appendix B: System Fields
Index

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