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Intro to the AS/400

Intro to the AS/400. Chapter 8 - Data File Utility. Copyright 1999 by Janson Industries. Objectives. Explain the capabilities of a DML Explain how DFU performs typical DML functions Demonstrate the advantages and disadvantages of DFU. Allows you to add, delete and modify data

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Intro to the AS/400

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  1. Intro to the AS/400 Chapter 8 - Data File Utility Copyright 1999 by Janson Industries

  2. Objectives • Explain the capabilities of a DML • Explain how DFU performs typical DML functions • Demonstrate the advantages and disadvantages of DFU

  3. Allows you to add, delete and modify data On the AS/400 you can use Application programs SQL/400 DFU Data Manipulation Language

  4. DFU • Allows you to create temporary or permanent update programs • Permanent update programs are stored as program objects with an attribute equal to DFU. Library DFU User Type = *PGM Att = DFU

  5. DFU generated programs • Allow you to display, modify or delete a single record (from one file) at a time • Generate an audit report and a screen • When creating permanent programs you can control: • Which fields can be accessed • The format of the displayed data • Audit report content • The update screen appearance

  6. Using DFU • To Create and Run a Temporary Program: • STRDFU - Option 5 • Option 18 from the “Work with Objects using PDM” screen • You are prompted for a library and file name

  7. STRDFU

  8. Using DFU

  9. Using DFU • If file is empty, default is entry mode • If file has data, default is change mode • To switch between modes: • F9 - Entry Mode • F11 - Change Mode • F23 - Deletes current record

  10. Mode DFU update screen File Switch Modes

  11. Defining Permanent Programs • Option 2: Create a Program • Prompts for file and program names • A series of screens will be displayed which allow you to: • Control program functions - update on scroll, generate an audit report, etc. • Define the screen layout and save the DDS definition • Control data fields - select and sequence, format, etc.

  12. Defining Permanent DFU Programs Format Control Function Control

  13. Defining Permanent DFU Programs

  14. Defining Permanent DFU Programs

  15. Defining permanent programs • DFU creates: • The permanent program • A display file (a screen) • Optionally, the DDS screen definition Library *FILE DSPF *PGM DFU Source Physical File DFU User Type = DSPF

  16. DFU generated update programs • Allow you to update data • Generate an audit report Library Audit Report Data Physical File Update Program Member User data data

  17. Managing Permanent DFU Pgms • Option 1: Run a Program • Activates previously defined update programs • Option 3: Change a Program • The create screens are redisplayed with the originally specified values • You can change any value • Option 4: Delete a Program • Deletes any previously defined update program

  18. Points to Remember • DFU is a quick way to generate update programs • Update programs allow you to easily add, delete and update data, one record at a time. • Any significant amount of data is burdensome to manipulate with DFU generated programs. • Permanent programs can be tailored re: function and format.

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