Extracts from AS/400 Concepts & Tools workshop

1. AS/400 Concepts & Tools

2. Day 1
• Introduction to the AS/400
• Basic Technical Concepts
• Programming Environment & Tools
• Programming Development Manager (PDM)
• Screen Design Aid (SDA)
• Source Entry Utility (SEU)

3. Day 2
• Nano Project
• Control Language (CL)
• Crash Investigation
• Debugging
• DB2/400
• Query/400
• Introduction to RPG

4. Objective
Give the participants a pretty good idea about
what a full course would be like and what to
expect if they decide to become AS/400
developers.

5. Hello World

6. How are you?

7. Under the hood

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Hello World
Start session B
EX00101DS
SAYHELLO
DSPCMD
EX00101
HELLOSRC / Library
Library contains HELLOSRC
HELLOSRC contains members

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How are you?
Session A
PDM Opt.1 (TRAINER1)
PDM Opt.1 (Ln22/23, F23, F24, F18, Bottom)
12 on TRAINER1 (Lib, Objects)
CRTLIB (Security, Msgs(24), +)
CRTSRCPF (112, W/o Desc.)
13 on HOWSRC
12 on HOWSRC

10. Architect’s Plan

11. The House

12. PF-SRC = Architect’s Filing cabinet
Member = Architect’s Plan
Compiler = Civil Engineer
Object = The House

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SDA
Opt.3 EX00201DS EX00201DSA
Opt.17; Explain WW Display Records screen
Opt.12-Ins/Del caution
2,2 *user, 1,60 *date, 2,65 *time
Date & Time >>>>, <<<<<,
User -=, -==, CW, CB, CP
Exit SDA
Session A (SAYHOWRYOU)
Session B (5 on EX00201DS)

14. i = Integration

15. PC
AS/400
Folder
Library
Excel file
=
Physical File
Worksheet
=
Member
Row
=
Record
Column
Field

16. Integrated File System (IFS)
Native Environment

17. Numeric Data
• Zoned Decimal (Also called Signed)
• Packed Decimal
• Binary (My suggestion: Do not use in Business Applications)

18. Zoned / Signed
Each digit needs one Byte.
If negative, sign is indicated by setting “B” bit “on” in Units position.
Positive
1
2
3
4
1
2
3
Negative
1
2
3 M
1
2 L

19. Sequential File Organization
4
8
7
8
7
2
5
5
2
4
8
7
2
4
School
School

20. Sequential Files
• No Key
• Data is stored in arrival sequence

21. Indexed File Organization
4
8
2
8
7
4
5
5
2
4
7
7
2
8
School
School

22. Indexed Files
• Have one or more Keys
• Conceptually, two files – one containing
record data, the other containing Key
Values and “Pointer” to the record data.
• Record data is stored in arrival sequence.
• “The other” file is automatically updated by
the Operating System.

23. Objects

24. 91 20 25399615
Library Type Name

25. Libraries
• Purpose
• Similarity to Windows Folders
• Exceptions

26. Libraries (Exceptions)
• QSYS
• QTEMP
– Purpose
– Creation
– Initialization
– Deletion

27. Library List

28. Database Files
• Physical Files Table in RDBMS
• Logical File View in RDBMS

29. Conceptual structure of a PF
File Description (Metadata)
Storage Area for Data
Member 1
Member 2
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Member n
Index (Access Path in IBM’s terminology)-Optional

30. Physical Files
PF-SRC
PF-DTA

31. PF-DTA & PF-SRC
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No “Structural” difference
Compilation
PF-SRC  No member
PF-DTA  One member
(Name defaults to File Name)

32. Members
• Use
• Type
• When to use
• When not to use

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Development Tools
Source Entry Utility
Screen Design Aid
Report Layout Utility
Data File Utility

34. Nano Project

35. Screen Design Aid (SDA), Option 2-Design menus

36. PF-DTA
Data File Utility (DFU)
Screen Design Aid (SDA), Option 1-Design screens
Control Language Program

37. Screen Design Aid (SDA), Option 2-Design menus

38. Screen Design Aid (SDA), Option 2-Design menus

39. We need
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A menu.
A Physical File to store Fruit Information. For menu option 1 (and 2 too).
A program to read Fruit Information from PF. For menu option 1.
A screen to display Fruit Information. For menu option 1 and 2.
A program to display Fruit Information using the DSPF. For menu option 1 and 2.
A Logical File (Index) with Fruit Name as the key. For menu option 2.
A program to read Fruit Information from LF. For menu option 2.

40. High Level Plan
1.Create Menu.
2.Implement Option 1.
3.Implement Option 2.
4.Implement Option 3.

41. Menu = Gift Wrapping

42. Revised High Level Plan
1.Implement Option 1.
2.Implement Option 2.
3.Implement Option 3.
4.Create Menu.

43. Option 1 Needs
1. A Physical File to store Fruit Information.
2. A program to read Fruit Information from PF.
3. A screen to display Fruit Information.
4. A program to display Fruit Information using the DSPF.

44. Option 01 Diagram
FRUITS
NP0101
Fruit Name
F3 Pressed?
(Y/N)
Purchase Price
NP0102
Retail Price
Wholesale Price
NP0102DS

45. FRUITS
Field Name
Size
Type
NAME
30
Character
30
1
30
PURPRICE
15,2
Zoned
15
31
45
RTLPRICE
15,2
Packed
8
46
53
WHLPRICE
14,2
Packed
8
54
61
?
Bytes From
To

46. Development Plan-Option 01
FRUITS
1. Create.
2. Populate.
NP0101
3. Create.
4. Test.
NP0102DS
ORANGE, 3000, 8000, 5000
PEACH, 15000, 30000, 20000
APPLE, 5000, 10000, 8000
5. Create.
NP0102
6. Create.
7. Test
Development
Testing

47. Query/400
• Benefits
• Limitataions

48. RPG
• Display “Hello World” (EX00103)
• Calculator (EX00403)

49. I hear and I forget.
I see and I remember.
I do and I understand.