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  3. June 2017

RE: Soft coding SQL based on parameter file

It saddens me daily. People who write fixed format code on a NEW project. But... It's "modern" because they use callp to read/write IFS files or have an embedded sql or, best of all, use the EVAL opcode.

People who have never heard of RDi, don't subscribe to any trade newsletters, don't know why SEU lights when I tell them about %scanrpl() for a task.

Why learn more? RPG is dead. No, it's not - you are. You are stealing fom your employer by not keeping your craft current.

The list goes on and on.


-----Original Message-----
From: MIDRANGE-L [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Alan Campin
Sent: Friday, June 02, 2017 3:27 PM
To: Midrange Systems Technical Discussion
Subject: Re: Soft coding SQL based on parameter file

Geez and we wonder why the iSeries is dying.

On Fri, Jun 2, 2017 at 3:16 PM, Roger Harman <roger.harman@xxxxxxxxxxx>
wrote:

Nice solution but I don't find mine too onerous.

Also, I have to consider someone else who might maintain it. Lowest
common denominator. <frown>

What CALLP? Not in my programs! Agreed, why would you use a 20 year old
technique these days?

Roger Harman
COMMON Certified Application Developer - ILE RPG on IBM i on Power







From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxx> on behalf of Alan
Campin <alan0307d@xxxxxxxxx>
Sent: Friday, June 2, 2017 11:57 AM
To: Midrange Systems Technical Discussion
Subject: Re: Soft coding SQL based on parameter file

Wouldn't this be simpler? No building all the different pieces?

dcl-c QUOTE '''';

sqlStmt = Select <<Q>><<FIELD1>><<Q>>, +
<<Q>><<FIELD2>><<Q>>, +'
<<Q>><<FIELD3>><<Q>>, +
<<Q>><<FIELD4>><<Q>>, +
Sum(<<FIELD1>>) , +
Sum('<<FIELD2>>, +
Count(*) +
From <<FILENAM>>';
sqlStmt = %ScanRpl('<<Q>>': QUOTE: sqlStmt);
sqlStmt = %ScanRpl('<<FIELD1>>': %Trim(SUMFLD102): sqlStmt);

etc.

Also, I am just curious. Why do you use CALLP? It has been obsolete for at
least 20 years. One thing that IBM does not do that they do in the Java and
C# world is deprecate things when they are no longer recommended. Using
CALLP also mean not being able to use return values.

On Fri, Jun 2, 2017 at 11:34 AM, Roger Harman <roger.harman@xxxxxxxxxxx>
wrote:

Oh yeah, %scanrpl() is awesome. I have a mailmerge app for AR letters
where I used it extensively.

Once I gave it some fresh thought, this was a simple solution...

// chain to get the file name, column names, and descriptions

qtSUMFLD102 = cnQT + %trim(SUMFLD102) + cnQT;
qtSUMFLD202 = cnQT + %trim(SUMFLD202) + cnQT;
qtSUMTXT102 = cnQT + %trim(SUMTXT102) + cnQT;
qtSUMTXT202 = cnQT + %trim(SUMTXT202) + cnQT;

sqlStmt = 'select '
+ qtSUMFLD102 + ' , '
+ qtSUMFLD202 + ' , '
+ qtSUMTXT102 + ' , '
+ qtSUMTXT202 + ' , '
+ 'sum(' + SUMFLD102 + ') , '
+ 'sum(' + SUMFLD202 + ') , '
+ 'count(*) '
+ 'from '
+ FILNAM02;

Prepare, etc..... Fetch Into :dsSum;

EVAL DSSUM
FIELD1 OF DSSUM = 'ORIAMOUNT '
FIELD2 OF DSSUM = 'REMAMOUNT '
TEXT1 OF DSSUM = 'ORIGINAL AMOUNT '
TEXT2 OF DSSUM = 'REMAINING AMOUNT '
VALUE1 OF DSSUM = 0000000000200.00
VALUE2 OF DSSUM = 0000000000100.00
RCDCOUNT OF DSSUM = 1


Roger Harman
COMMON Certified Application Developer - ILE RPG on IBM i on Power








From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxx> on behalf of Alan
Campin <alan0307d@xxxxxxxxx>
Sent: Friday, June 2, 2017 10:52 AM
To: Midrange Systems Technical Discussion
Subject: Re: Soft coding SQL based on parameter file

If you are on V7R1 or forward use %SccanRpl. Will make your life so much
easier.

Statement = 'Select <<FIELD1>>,
<<FIELD2>>
From <<File>>
Where <<FIELD3>> = Cast(? As Char(10))'

Statement = %ScanRpl('<<FIELD1>>', FieldName, Statement);

etc.

Especially handy for quotes

dcl-c QUOTE '''';

Statement = 'Select <<FIELD1>>,
<<FIELD2>>
From <<File>>
Where <<FIELD3>> = Cast(? As Char(10))' And
<<FIELD4>> = <<Q>>Y<<Q>>)'

Statement = %ScanRpl('<<Q>>',QUOTE: Statement);



On Fri, Jun 2, 2017 at 10:19 AM, Roger Harman <roger.harman@xxxxxxxxxxx>
wrote:

Thanks. I did get it to work with dynamic SQL. Just straightening out
the right mix of literals and data values to string together.

Short & Sweet to do what I want.

Roger Harman
COMMON Certified Application Developer - ILE RPG on IBM i on Power







From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxx> on behalf of
dlclark@xxxxxxxxxxxxxxxx <dlclark@xxxxxxxxxxxxxxxx>
Sent: Friday, June 2, 2017 8:21 AM
To: Midrange Systems Technical Discussion
Subject: Re: Soft coding SQL based on parameter file

Just use VALUES ... INTO and dynamic SQL. You just have to
build
most of the SQL statement in a variable-length character variable. You
can't use a parameter marker for the select columns or the table/view
names FROM which to get the data or the GROUP BY or ORDER BY clauses.
You
can use parameter markers for the WHERE clause if you want to.

Sincerely,

Dave Clark
--
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direct: (937) 531-6378
home: (937) 751-3300

Winsupply Group Services
3110 Kettering Boulevard
Dayton, Ohio 45439 USA
(937) 294-5331



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