Re: Declaring datastructure for variable file..

Robert,

I don't know if this helps - but I did something a bit like this to build a
string of JSON to insert into a CLOB in a DB2 table based on an RPGLE
update trigger on another table.

I built the JSON dynamically against SYSIBM/SYSDUMMY1 and based it on which
fields had changed on the table according to the trigger buffer.

I then ran the SQL SELECT into a Host Variable and used that for the final
insert.

So - start building the SQL string, in this example I always have msgType
and itemRef keys

SqlStm = 'Select JSON_OBJECT(''msgType'' value ''' + %TrimR(MsgType) +
''', '
+ '''itemRef'' value ''' + %TrimR(After.TPStockRef) + ''' ';

Then append any fields that have changed according to the trigger buffer
(not appropriate to your case probably, but I was just continuing to build
up the SQL to create the JSON string (I've included a numeric field
(Status) and a char field (Grade) as examples)

If After.Status <> Before.Status;
SqlStm += ', ''status'' value ' + %Char(After.Status) + ' ';
EndIf;

If After.Grade <> Before.Grade;
SqlStm += ', ''grade'' value ''' + %TrimR( After.Grade ) + ''' ';
EndIf;

etc,

Then finish off the SQL statement:

SqlStm += ') From SysIbm/SysDummy1';

So you end up with a statement that looks something like:

Select JSON_OBJECT( 'msgType' value 'stockUpdate', 'itemRef'
value 'ABD7743' , 'status' value 3) From SysIbm/SysDummy1

You can then fetch that statement into a host variable (I just used a
varchar as the host variable) in the program and use that for the insert
into the CLOB.

regards,
Craig








On Mon, 1 Jul 2019 at 21:02, Robert Rogerson <rogersonra@xxxxxxxxx> wrote:

@Dave, I'll look into the DESCRIPTORS in sql.
@Charles. The purpose is to create a JSON document where the in the format

{
"FILENAME1 ": [

{"col1": "col1 data"},
{"col2": "col2 data"}
]

}

The challenge is that FILENAME1 is not know until run time.

Any thoughts or admise would be appreciated.

Thanks,

Rob


On Mon, Jul 1, 2019 at 3:20 PM <dlclark@xxxxxxxxxxxxxxxx> wrote:

"RPG400-L" <rpg400-l-bounces@xxxxxxxxxxxxxxxxxx> wrote on 07/01/2019
02:26:16 PM:

I'm creating procedure where I want to pass the file name to the
procedure. So my file declaration in the procedure is...
dcl-f infile disk usropn extfile(pFileIn);

Now when I want to read the file as it's in a procedure I must use a

data

structure. How do I define the data structure as the file is unknown

at

compile time. I'm thing something like...

dcl-ds inFileDs extname(pFileIn) end-ds;
But it gives me
RNF3523: External description INFILEDATA for data structure is not

found;

data structure is ignored.
RNF3608: The parameter for the EXTNAME or EXTFLD keyword must be a
character literal or constant.

How should I be defining this?

If you really want to use "standard" RPG for this type of access
then you would have to create an open data structure (i.e., with no
subfields) and parse it out yourself using %substr. But then you would
have to know the file layout ahead of time, too -- or use an API to get
the equivalent of DSPFFD. Alternatively, SQL has DESCRIPTORS to get the
column definitions.


Sincerely,

Dave Clark
--
int.ext: 91078
direct: (937) 531-6378
home: (937) 751-3300

Winsupply Group Services
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(937) 294-5331

Thanks,

Rob
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