RE: Embedded SQL Dynamic Selection -- MIDRANGE-L

I should really keep track of all the RPG functions that the SQL pre-compiler does not support. When I get a host variable not usable message, I tend to go through a number of iterations to finally end up with a variable that will work.

A couple things I am aware of:
Host arrays can't have a dimension that's defined by a constant "variable." Meaning Dim(10) will work, but Dim(MAX_ELEMENTS) will not work if MAX_ELEMENTS is defined as a constant. I think it'll work if defined as a variable, but I can't remember for sure.
Host variables/structures cannot be defined LIKE a Template variable/structure (I might be leaping in logic here, the Templates I deal with are all qualified data structures, so it could be that the Template limitation has to do with qualified DS's only).
Host structures cannot be defined using LIKEREC. I've had to use ExtName instead. (The SQL police might show up and say "Don't do Select *!" but I do this in file encapsulated service programs to load a global data structure array that all of the Gets and Sets access.

Someone can correct me if I'm wrong on any of these. Or add to them.

-Kurt Anderson

-----Original Message-----
From: midrange-l-bounces@xxxxxxxxxxxx [mailto:midrange-l-bounces@xxxxxxxxxxxx] On Behalf Of Michael Ryan
Sent: Thursday, November 08, 2012 10:21 AM
To: Midrange Systems Technical Discussion
Subject: Re: Embedded SQL Dynamic Selection

Hi Bob...yup, the MODS WkInvMstP is defined in the D specs, well before any of the SQL statements. Thanks.

On Thu, Nov 8, 2012 at 10:28 AM, Bob P. Roche <BRoche@xxxxxxxxxxxxxxxxx>wrote:

Make sure your variable is defined earlier in your code than the
placement of the SQL statement. Actually earlier in the code listing,
the fact that you program may hit the definition first while running
does not make a difference. Of course all your variables are defined
in the D specs so this may not be the issue.

From:
Michael Ryan <michaelrtr@xxxxxxxxx>
To:
Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxx>,
Date:
11/08/2012 09:15 AM
Subject:
Re: Embedded SQL Dynamic Selection
Sent by:
midrange-l-bounces@xxxxxxxxxxxx

Thanks for looking at this Birgitta. I 'fat fingered' the error
message...it's SQL5011:

SQL5011: Position 55 Host structure array WKINVMSTP not defined or not
usable

on this statement:

Fetch Next From C1 For :Maxrows Rows Into :Wkinvmstp;

Thanks!

On Thu, Nov 8, 2012 at 9:59 AM, Birgitta Hauser
<Hauser@xxxxxxxxxxxxxxx>wrote:

Error Message means SQL0511 - Not allowed for update.
Multiple row fetches cannot be used if you want to update your table
directly using a cursor and specify the WHERE CURRENT OF Clause in
the update statement.

The error message has nothing to do with static and dynamic SQL or

using

host variables or parameter markers.
Multiple row fetches are also not allowed for dynamic SQL with Update.

Mit freundlichen Grüßen / Best regards

Birgitta Hauser

"Shoot for the moon, even if you miss, you'll land among the stars."

(Les

Brown)
"If you think education is expensive, try ignorance." (Derek Bok)
"What is worse than training your staff and losing them? Not
training

them

and keeping them!"

-----Ursprüngliche Nachricht-----
Von: midrange-l-bounces@xxxxxxxxxxxx
[mailto:midrange-l-bounces@xxxxxxxxxxxx] Im Auftrag von Michael Ryan
Gesendet: Thursday, 08.11 2012 15:21
An: Midrange Systems Technical Discussion
Betreff: Embedded SQL Dynamic Selection

So folks...sorry to be a pest...but is the reason I'm getting an
SQL5011

on

this statement:

Fetch C1 For :Maxrows Rows Into :Wkinvmstp;

Is because my Declare looks like this:

Exec SQL
DECLARE C1 CURSOR FOR
Select * From INVMSTP
Where Imvnda Between :HostFld1 And :HostFld2 And ...
(a long statement)

and it needs to be parameter markers instead of host variables in
the

WHERE

clause?
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