ABAP Programming

This tutorial helps you get started with ABAP programming from scratch. You will learn the language fundamentals step by step, write small programs, work with data, control program flow, organize reusable logic, and build a foundation for modern ABAP development.

Section 1. Getting Started #

Start with the basic structure of an ABAP program and learn how ABAP source code is written and executed.

• Hello World – Develop your first ABAP program and display output with the WRITE statement.
• Syntax – Learn the basic ABAP syntax, including statements, periods, comments, identifiers, and case sensitivity.
• Comments – Add documentation and explanations to ABAP source code using full-line and inline comments.
• Statements – Understand how ABAP statements are structured and terminated.

Section 2. ABAP Data Types and Variables #

Learn how ABAP represents values in memory and how to declare data objects for use in a program.

• ABAP Data Types – Explore elementary, complex, and reference data types in ABAP.
• Variables – Declare variables with the DATA keyword and assign values to them.
• Constants – Declare data objects whose values do not change at runtime.
• Literals – Use text, numeric, and string literals in ABAP expressions.
• Type Conversion – Convert compatible values from one data type to another.
• Inline Declarations – Declare variables close to where they are first used with expressions such as DATA(...).

Section 3. Operators and Expressions #

Use operators and expressions to calculate values and evaluate conditions.

• Arithmetic Operators – Perform addition, subtraction, multiplication, division, and other numeric operations.
• Comparison Operators – Compare values with operators such as =, <>, <, >, <=, and >=.
• Logical Operators – Combine Boolean conditions with AND, OR, and NOT.
• String Expressions – Build and combine character-like values, including string templates.

Section 4. Control Flow #

Control which statements run and how many times a block of code is executed.

• IF ELSE – Conditionally execute a code block based on one or more logical expressions.
• CASE – Select one code block based on the value of an operand.
• DO – Repeat a block of statements a fixed number of times or until explicitly stopped.
• WHILE – Repeat statements while a logical condition remains true.
• LOOP AT – Iterate over the rows of an internal table.
• CHECK, CONTINUE, and EXIT – Control execution within loops and processing blocks.

Section 5. Character Strings #

Work with text values, combine strings, search for content, and format output.

• Character and String Types – Understand fixed-length character fields and dynamic strings.
• Concatenate Strings – Combine multiple text values into one result.
• String Templates – Embed values and formatting expressions inside pipe-delimited templates.
• Find and Replace Text – Search for substrings and replace matching text.
• Split Text – Break a text value into separate components.

Section 6. Structures #

Group related fields into a single structured data object.

• Define a Structure – Create structured types and data objects with multiple components.
• Access Structure Components – Read and update individual fields using the component selector.
• Nested Structures – Organize structures that contain other structures.
• CORRESPONDING – Copy identically named components between compatible structures.

Section 7. Internal Tables #

Store and process multiple rows of structured data in memory.

• Internal Table Basics – Understand rows, table types, keys, and work areas.
• Standard, Sorted, and Hashed Tables – Choose an internal table category based on access and performance requirements.
• APPEND and INSERT – Add rows to an internal table.
• READ TABLE – Find and retrieve a row using an index or table key.
• LOOP AT Internal Tables – Process rows sequentially or conditionally.
• MODIFY and DELETE – Update or remove rows from an internal table.
• Table Expressions – Access internal table rows with concise expression syntax.

Section 8. Modularization #

Split programs into smaller, reusable, and easier-to-maintain processing units.

• Procedures Overview – Compare methods, function modules, and subroutines.
• Subroutines – Define and call classic processing blocks with FORM and PERFORM.
• Function Modules – Use reusable functions managed in the Function Builder.
• Methods – Encapsulate behavior in classes and call methods through class or object references.

Section 9. ABAP Objects #

Learn the object-oriented programming model used in modern ABAP applications.

• Classes and Objects – Define classes and create object instances.
• Attributes – Store object and class-level state.
• Methods – Define operations performed by a class or object.
• Constructors – Initialize objects and class-level data.
• Visibility – Control access with public, protected, and private sections.
• Inheritance – Extend an existing class and reuse or redefine behavior.
• Interfaces – Define contracts that can be implemented by different classes.
• Polymorphism – Work with compatible reference types and redefined methods.

Section 10. Exception Handling #

Handle runtime problems without abruptly terminating the program.

• Class-Based Exceptions – Understand exception classes and exception objects.
• TRY CATCH CLEANUP – Catch and respond to exceptions in a protected processing block.
• RAISE EXCEPTION – Signal an exceptional condition from a method or processing block.
• Exception Messages – Provide useful diagnostic information when an exception occurs.

Section 11. Database Access with Open SQL #

Read and modify SAP database data with database-independent ABAP SQL statements.

• SELECT – Read one or more rows from a database table or view.
• SELECT SINGLE – Read one matching database row when the access pattern is appropriate.
• INSERT – Add rows to a database table.
• UPDATE – Change existing database rows.
• MODIFY – Insert or update database rows according to the statement variant.
• DELETE – Remove rows that match defined criteria.
• Joins – Combine related data from multiple database sources.
• Aggregate Expressions – Calculate totals, counts, minimums, maximums, and averages in the database.

Section 12. Reports and Selection Screens #

Build executable ABAP reports that accept input and present useful results.

• Executable Programs – Understand the event-driven structure of an ABAP report.
• PARAMETERS – Add a single-value input field to a selection screen.
• SELECT-OPTIONS – Accept ranges, multiple values, and exclusion criteria.
• Selection-Screen Events – Validate and respond to user input before report execution.
• Basic List Output – Display simple report output with WRITE, ULINE, and related statements.

Section 13. ALV Reporting #

Present business data in an interactive table with sorting, filtering, totals, and layout options.

• ALV Overview – Understand the purpose and common capabilities of the ABAP List Viewer.
• Display Data in ALV – Display an internal table with a basic ALV implementation.
• ALV Columns – Configure headings, visibility, alignment, and output length.
• ALV Sorting and Filtering – Define initial sorting and filtering behavior.
• ALV Events – Respond to user interactions such as link clicks or double-clicks.

Section 14. ABAP Development Practices #

Write ABAP code that is readable, maintainable, testable, and suitable for modern SAP development.

• Naming Conventions – Use consistent and meaningful names for variables, types, methods, and classes.
• Clean ABAP – Apply clear structure, small methods, meaningful abstractions, and simple control flow.
• Code Inspector and ATC – Detect quality, security, performance, and compatibility issues.
• ABAP Unit – Create automated unit tests for classes and reusable logic.
• Performance Basics – Reduce unnecessary database access and choose appropriate internal table operations.
• Authorization Checks – Protect sensitive operations and data with explicit authorization validation.