Extracts from AS/400 Concepts & Tools workshop

AS/400 Concepts & Tools

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)

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

ObjectiveGive 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. 

Hello World

How are you?

Under the hood

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

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

Architect’s Plan

The House

PF-SRC = Architect’s Filing cabinetMember = Architect’s PlanCompiler = Civil Engineer

Object = The House

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)

i = Integration

PC AS/400

Folder Library

Excel file = Physical File

Worksheet = Member

Row = Record

Column Field

Integrated File System (IFS)

Native Environment

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

Zoned / Signed

Positive Negative1 2 3 4

1 2 3

1 2 3 M

1 2 L

Each digit needs one Byte.

If negative, sign is indicated by setting “B” bit “on” in Units position.

87

54

2

72

58

4

48

52

7

Sequential File Organization

School School

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

87

54

2

24

57

8

48

52

7

Indexed File Organization

School School

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.

Objects

91 20 25399615Library Type Name

Libraries• Purpose• Similarity to Windows Folders• Exceptions

Libraries (Exceptions)• QSYS• QTEMP

– Purpose– Creation– Initialization– Deletion

Library List

Database Files

• Physical Files Table in RDBMS• Logical File View in RDBMS

File Description (Metadata)

Storage Area for Data

Index (Access Path in IBM’s terminology)-Optional

Member 1

Member 2

Member n

.

.

.

Conceptual structure of a PF

Physical FilesPF-SRCPF-DTA

PF-DTA & PF-SRC• No “Structural” difference• Compilation• PF-SRC No member• PF-DTA One member

(Name defaults to File Name)

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

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

Nano Project

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

Screen Design Aid (SDA), Option 1-Design screens

PF-DTA

Control Language Program

Data File Utility (DFU)

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

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

We need• 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.

High Level Plan

1.Create Menu.2.Implement Option 1.3.Implement Option 2.4.Implement Option 3.

Menu = Gift Wrapping

Revised High Level Plan

1.Implement Option 1.2.Implement Option 2.3.Implement Option 3.4.Create Menu.

Option 1 Needs1. 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.

Option 01 DiagramFRUITS NP0101

NP0102 NP0102DS

Fruit Name

Purchase Price

Retail Price

Wholesale Price

F3 Pressed?(Y/N)

FRUITS

Field Name Size Type Bytes From To

NAME 30 Character 30 1 30PURPRICE 15,2 Zoned 15 31 45RTLPRICE 15,2 Packed 8 46 53

WHLPRICE 14,2 Packed 8 54 61

?

Development Plan-Option 011. Create.2. Populate.

3. Create.4. Test.

5. Create.

6. Create.7. Test

FRUITS

NP0101

NP0102

NP0102DS

ORANGE, 3000, 8000, 5000PEACH, 15000, 30000, 20000 APPLE, 5000, 10000, 8000

DevelopmentTesting

Query/400• Benefits• Limitataions

RPG• Display “Hello World” (EX00103)

• Calculator (EX00403)

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