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  1.  Home
  2. RPG400-L
  3. January 2018

Re: Identity_Val_Local() on a DDM File

I'm not saying I wouldn't use DDM, but I haven't used it much at all in
many recent years.

If available time, project $, team skillsets, existing technology in use,
politics, etc. steer me towards using DDM, I'd certainly give it a try. My
main concern is spending the companies money efficiently. On the other
hand, if DDM started balking at my attempts to use it, I'd probably abandon
it quickly for either a 3 part SQL approach, or simply using a CONNECT
statement to connect to the remote system, followed by a 2 part SQL INSERT,
sticking to a more standard, modern SQL approach.

On Fri, Jan 5, 2018 at 9:45 AM, Craig Richards <craig@xxxxxxxxxxxxxxxx>
wrote:

That's great thanks Mike,

I very much appreciate you taking the time to explain.
Even if the DDM File works and performs ok I'll try to find time to look
into the process you describe, I always think of DDM Files as a bit clunky
( which I admit might be unfair of me... )
Best regards,
Craig

On 5 January 2018 at 17:35, Mike Jones <mike.jones.sysdev@xxxxxxxxx>
wrote:

Hi Craig,

3 part SQL looks like this:

=> While connected to system A <=, run an INSERT into a table on system
B,
that looks like this:

insert into B.MY_SCHEMA.MY_TABLE

...rest of insert statement

It is called 3 part SQL because there are 3 parts, separated by a period,
that identify the target table:
1) B is the remote system name
2) MY_SCHEMA is the schema name on system B
3) MY_TABLE is the table name on system B

It has been a long time since I've configured systems to allow the use
of 3
part SQL, but one part I recall is you need a RBD directory entry setup
via
the WRKRDBDIRE command that defines the remote system you're going to
access in that 3 part SQL. You also have authentication and
authorization
to deal with, because the remote system isn't going to allow just anyone
(authentication) to connect to it and do whatever they want to whatever
resource (authorization), in typical security scenarios at least. I
believe the default configuration is an attempt to use 3 part SQL will
use
the same user ID and password that is in use on system A to authenticate
onto system B and to determine if that authenticated user is authorized
to
the remote table being referenced.

In that scenario, IDENTITY_VAL_LOCAL() has worked for me. When I tried
it
for the first time, I wasn't too confident it would work, but I was
pleasantly surprised it did. I lost track a long time ago of the number
of
times I've thrown something at the SQL engine where I was expecting a
good
chance of regurgitation, and it replied with a "haha no problem I've got
your back".

Mike

On Fri, Jan 5, 2018 at 9:06 AM, Craig Richards <craig@xxxxxxxxxxxxxxxx>
wrote:

Hi Mike,

Thanks for your reply.
I'm sorry I'm not sure what you mean by "3 Part SQL" would it be
possible
for you to elaborate a little?
The DDM is not my design and I'm not married to it so if there is a way
you
think is preferable I'm certainly open to suggestions.
thanks kindly,
Craig

On 5 January 2018 at 16:46, Mike Jones <mike.jones.sysdev@xxxxxxxxx>
wrote:

Hi Craig,

I've not tried that specific DDM example, but I have successfully
used
IDENTITY_VAL_LOCAL() when I connected to, for example, system A, and
I
use
3 part SQL referencing system B involving INSERTs into a table on
system
B. That is an alternative to use, and in my opinion is preferable to
use,
versus the DDM route to get that done.

Mike

On Fri, Jan 5, 2018 at 4:27 AM, Craig Richards <
craig@xxxxxxxxxxxxxxxx

wrote:

Hi All,

Does anyone know offhand if you can use Identity_Val_Local() on a
DDM
File?

I don't have the opportunity to test this at the moment but I will
need
to
tweak my design if not.

Specifically:

1. Client on LPAR 1 has a DDM File pointing to a file on LPAR2.
2. The file on LPAR2 has a "generated always as identity"
column.
3. Client on LPAR 1 writes a record to the DDM File
4. Can the client then use identity_val_local() to retrieve the
generated column value?

Thanks kindly in advance,
Craig
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