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

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.

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 cabinet Member = Architect’s Plan Compiler = 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

PCAS/400 FolderLibrary Excel file=Physical File Worksheet=Member Row=Record ColumnField

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 PositiveNegative M12L Each digit needs one Byte. If negative, sign is indicated by setting “B” bit “on” in Units position.

Sequential File Organization School

Sequential Files No Key Data is stored in arrival sequence

Indexed File Organization 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

Library 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 Files PF-SRC PF-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

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 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.

Option 01 Diagram FRUITSNP0101 NP0102 NP0102DS Fruit Name Purchase Price Retail Price Wholesale Price F3 Pressed? (Y/N)

FRUITS Field NameSizeTypeBytesFromTo NAME30Character301 PURPRICE15,2Zoned RTLPRICE15,2Packed84653 WHLPRICE14,2Packed85461 ?

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

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.