skills for the rpg prog 2
TRANSCRIPT
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7/29/2019 Skills for the Rpg Prog 2
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Skills for the RPG Programmer
ComCon5, Oakton Court
Ballybrack
Co. Dublin
Ireland
Re-skilling the RPG Programmer
Phone: +353 1 282 6230
e-Mail: [email protected]
Web: www.ComConAdvisor.com
Paul Tuohy
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WEBCAST SCHEDULE
Todays event will run one-hour long. Here are the expected times foreach segment of the webcast:
:00 :05: Moderator introduces the speaker and discusses the detailsof the Webcast.
:05- :35: Speaker delivers a PowerPoint presentation on the webcasttopic.
:35- :60: Moderator and speaker engage in a Q&A on the topic.
You can submit questions to the speaker at any time during the event.Just click on the Ask a Question button at the bottom of thepresentation screen.
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TECHNICAL FAQs
Here are answers to the most common technical problems users encounter
during a webcast:
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A: The slides are constantly be pushed to your screen. Youll should refresh(hit F5) to view the latest slide.
If your question is still not answered, please click the Ask a Questionbutton at the bottom of your screen and submit your problem. A technicalsupport person will respond immediately.
You can also visit the Broadcast Help page for more information or to testyour browser compatibility: http://help.yahoo.com/help/bcst/
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Skills for the RPG Programmer
ComCon5, Oakton Court
Ballybrack
Co. Dublin
Ireland
Re-skilling the RPG Programmer
Phone: +353 1 282 6230
e-Mail: [email protected]
Web: www.ComConAdvisor.com
Paul Tuohy
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2001 ComCon
Agenda
Skills for what? Why do you need to re-skill? What has changed?
What Are The First Steps? Know your system.
Know your database.
Use The Right Tools for the Job. Get to Grips with RPG IV and ILE.
Find Out about Event-Driven Programming.
Learn the basics of HTML and Javascript.
Then What? HTML, Javascript and CGI. Visualage RPG
Java
WebSphere whatever.
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The times they are a changing.......
Java
WebSphere
ILEWebFacing
RPG IV
HTML/CGI
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Premise
You are not using third-party tools There are many Greatthird-party tools out there.
I will mention some later.
Maybe you should be using one of them!!!!
All You Have is WebSphere Development Toolset (V5R1)
or WebSphere Development Studio Client (V5R1/V5R2)!Application Development Toolset (ADTS). WebSphere Development Tools for iSeries.
Code/400 (Editor, Designer, Project Manager).
Distributed Debugger
WebSphere Studio
WebFacing Tool
VisualAge for RPG. VisualAge for Java
ALL of the compilers for OS/400RPG, Cobol, C, Java, etc.
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Where to Start?
There are a few things you need to look into before you enhance
your programming skills. Become familiar with the IFS (Integrated File System)
Become familiar with iSeries Navigator (Operations Navigator)Especially the IFS and Database.
Grasp the basics of SQLYou can do this from iSeries Navigator without Interactive SQL.
SQL is slowly(?) replacing DDS. Find out about triggers.
Find out about referential integrity.
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Use iSeries Navigator
iSeries Navigator is the GUI interface for OS/400 Navigator is getting the development dollars Green Screen is not! Navigator is part of the free portion of iSeries Access.
Have a look at Basic Operations to get a feel for how it works.
Become familiar with the IFS (Integrated File System)
Become familiar with the Databases.
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Explore the IFS
iSeries supports multiple file systems not just QSYS! Root - PC style QOpenSys - Unix style
QDLS - Shared Folders
QSYS.LIB - Traditional OS/400
QOPT - Optical Storage
QNTC - Windows NT Servers
And more
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Explore Databases
This is the new interface for Database functions Have a look at how tables/views and indexes are created
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Creating a Table
This is not DDS! Navigator offers a friendly interface to SQLs Data Definition Language (DDL)
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Database Navigator
Database Navigator will give you a diagram of your Database! Just a little bit easier then DSPFD and DSPFFD!
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SQL
Get to grips with SQL. It is becoming the standard for maintaining the database. SQL is being developed - DDS is not.
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Triggers and Referential Integrity
Triggers Programs that are called when a row (record) is inserted, updated or deleted.An excellent means of applying business rules.
Referential Integrity Define relationships between tables (physical files) e.g.
You cannot delete a customer if they have outstanding invoices
When you delete the Order Header record, automatically delete allcorresponding Order Details.
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The Choices
Green ScreenAlthough everything is heading towards GUI,
there is still a place for green screen within
applications.
Not everything lends itself to point and click.
GUI Application Good old Client Server!
Browser-based The interface is in a browser.
Fast becoming the most popular.
Easiest to distribute to the Internet.
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The Right Tools
Get with the right tools.
SEU/SDA/RLU are NOT up to the job.
Use of Code/400 can increase productivity by 20% to 40%!!!
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Code/400
Code/400 isA customizable editor Reference manual as help
Navigator
Verifier
Much, much more
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Code/400 Editor
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Code/400 Verifier
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Code/400 Help
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Code/400 Navigator
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RPG IV
Get up to speed with RPG IV
If you are still using RPG III - STOP NOW
You will start to see gains from RPG IV within a very short period of
time.
/FREED_PgmTxt = *Blank;D_Proc = SDSProcName;D_PgmTxt = 'Work with';
If Show_Paid and Show_Unpaid;D_PgmTxt = %trim(D_PgmTxt) + ' Paid and Unpaid';EndIf;
If Show_Paid and Not Show_Unpaid;D_PgmTxt = %trim(D_PgmTxt) + ' Paid';
EndIf;
/END-FREE
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Getting there
Getting there is easy!
CVTRPGSRC IBM supplied conversion tool.
Performs basic syntax conversion.
Convert, Compile, Relax.
Third-party Option If you want more than basic syntax conversion.
If you want code re-engineered to use new features.
Check out the RPGToolBox from Linoma Software (www.linoma.com)
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RPG IV Highlights
Here you have it -- the brand new RPG!
10-character external names (files, format and field names).Allow mixed case.
Allow blank lines.
Introduction of new Definition (D) Specification.
Elimination of Extension (E) and Line Counter (L) Specifications and the
practical elimination of Input (I) Specifications.
Re-definition of the Header (H), File (F) and Calculation (C) Specifications. More powerful array definition and processing.
Prefixing externally defined files.
Date processing and manipulation.
Named Indicators Introduction of new data types, especially integers and pointers.
Introduction of Built-in Functions (e.g. %SUBST). Introduction of Subprocedures and other ILE-related features.
Integration with Java.
And, of course, free format.
But perhaps the most important change is that the re-structuring has made RPG
even easier to change in the future
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Subprocedures
Subprocedures are the biggest change to RPG - EVER!
They provide a means ofencapsulation.
DayNumber = DayofWeek(InputDate);
ErrInds = ValidCustomer(CustomerData);
If (GetCustomerDept(Customer)) = 'A01';
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Subprocedures
This is what the code looks like.......
P DayOfWeek BD PI 1P 0D InpDate D
D ASaturday S D Inz(D'02/13/99')D WorkDay S 1P 0
/FREE
WorkDay = %Rem(%Diff(InpDate : ASaturday : *D): 7);If WorkDay < 1;
WorkDay = WorkDay + 7;EndIf;
Return WorkDay;
/END-FREEP DayOfWeek E
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ILE
Subprocedures lead to Service Programs.
You start to look at program design in a different way.
Procedure
Procedure
Procedure
Procedure
Procedure
Procedure
*Module
*Module
*SrvPgm
Procedure
Procedure
*Module
Procedure
Procedure
*Module
*Pgm
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Clients are Event Driven!
Client Applications are event driven.
Client Applications can be written in: Java
Visual Basic
C/C++
Any PC programming language
Even RPG!!!!
For VisualAge RPG you need to learn GUI Design
Event Driven
But it is still RPG
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HTML
Learn the basics of HTML Easy to learn Lots of good books.
I liked "HTML for the World Wide Web" by
Elizabeth Castro ISBN 0-201-35493-4
Code/400 is a HTML editor.
To contact us:
Phone: +353 1 282 6230
Fax: +353 1 282 6230
Email:5, Oakton Court
Ballybrack
Co. Dublin
IrelandComCon Computer Consultants 2002
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CGI stands for 'Common Gateway Interface' It supports the ability to dynamically build Web pages
It dictates format of the data stream for requests and responses
A standard for communicating between a browser and an HTTP Server
Server is configured to pass specific URLs to CGI scripts Not simply to respond with a pre-built Web page
In our case the "script" will be an RPG IV program
The program generates HTML and passes it to the server Which then sends it out for display as it would any other page
CGI programming on the AS/400 is supported by RPG IV (ILE RPG)
Java Plus ILE COBOL, ILE C, ILE C++, Rexx and Perl
What is CGI ?
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Sample of a CGI Web Page
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Sample of Code for Previous Page
WebOut = NewLine+ ''+ '' + ProdCd +''+ ''+ ProdDs +''+ '' + CatCod + ''+ '' + %Char(LndCst) + ''+ '' + %Char(SellPr) + ''+ '' + PrLOrdA + ''+ '' + NoDaysA +''
WriteWebData(WebData : WebDataLen : APIError)
This writes one "detail" line The HTML code is constructed in
the RPG Program.
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"Native" CGI problems
The APIs are not as simple as one would likeAnd the documentation is less than wonderful
Generating HTML directly in the program reduces flexibility To change the text, one must change the program
And it is much more difficult to use HTML editors to design the pages
It would be nice to have something like DDS That way only the variable content is handled by the program
But writing such a generalized routine to process HTML text and perform text
substitution is not a trivial task
IBM has an answer
And it is FREE !!
The CGIDEV2 LibraryAvailable for download at www-922.ibm.com
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Sample from CGIDEV
: :/$TableRow
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So Far......
If you learn RPG IV Some ILE
Some HTML
You can be on the Web in No Time!
Getting to the Web is Easy!!!!!
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J avascript
Extend those HTML capabilities
Javascript is NOT full blown Java -
by any means.
Quote of the DayQuote of the Day
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WebFacing
DOWProto
P DayOfWeek B
D PI D/Copy 1P0D WorkDate D
D AnySunday S D INZ(D'1995-04-02')
D WorkNum S 7 0
D WorkDay S 1P 0
C WorkDate SubDur AnySunday WorkNum:*DC WorkNum Div 7 WorkNum
C MvR WorkDay
C If WorkDay < 1
C Return WorkDay + 7
C Else
C Return WorkDay
C EndIfP DayOfWeek E
RPG Programenter customer number:_____
Time:8:05 date:Oct 22,2000
?Workstationmanager
Converts DDS to Servlets and JSPs
There is NO change to the RPG Programs
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WebSphere Studio
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WebSphere Application Server
TCP/IP
HTTPserver
Servlet EngineJDBCRPGCobolEtc.
AdministrativeServer
Database
Any Client,
Any Browser
HTMLWeb
Browser
AdminConsole
EJB Container
Application Server
EJB Client
Servlets
Java Server Pages (JSPs) Enterprise Java Beans (EJBs)
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And then there is J ava
Get to grips with OO.... it is very different.
A good grounding in RPG IV and ILE makes it easier to understand.
Get Phone
Get Address
Set Balance
Get Balance
Get Name
Get
Balance
GetAddress
Set
Balance
Set Name
& AddressSet
Balance
A Customer
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A Plan of Action
IFS
iSeries
Navigator
SQL
Triggers and
RI
Must Do....... Should Do....... And then Any of.......
Code/400
RPG IV and
ILE
HTML and
CGI
WebFacing
VisualAge for
RPG
OO and Java
WebSphere
Studio,
Javascript
and JSPs
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The Learning Curve
0 10 20 30 40 50 60 70 80 90 100
W ork Days
Code/400
RPG IV
ILE
Basic CGI
CGIDEV
Basic WAS
Basic W ebfacing
W ebsphere Studio
OO
Java
Topics
The Learning Curve
Course
Self Teach
Practice
Times are opinion based on the experience of many. "Practice" is to a level of proficiency as opposed to expertise.
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How Long Will It Take?
Pick the Route Carefully!!!!!!
Course Self Teach Practice
Code/400 2 5 7
RPG IV 4 10 10
ILE 2 10 80
Basic CGI 1 5 25CGIDEV 2 5 15
Basic WAS 3 10 20
Webfacing 2 5 15
Studio 2 5 10
OO 3 10 100Java 8 20 30
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Questions?
Submit your questions now by clicking on the
Ask A Question button in the left corner
of your presentation screen.
Paul will answer your questions
shortly after the broadcast.