Re: CREATE TABLE AS ... WITH DATA -- RPG400-L

Yeah, the fully-dynamic approach does not keep an access plan with the program. But in recent releases, there is a system-wide plan cache for statements run through the new engine, at least, and that is where these ad hoc plans are kept - but not over an IPL.

Michael_Schutte@xxxxxxxxxxxx wrote:

Thanks, I figured that would be the case.

Your "otherwise" suggestion... that's not good practice is it? Because
access paths are not saved with the program. It would need to be determined
with every execution.

--

Michael Schutte
Admin Professional

Try Bob Evans GRILLING SAUSAGE! This summerâs hottest destination is your
own backyard with Bob Evans Brats and Italian Sausage! For tasty recipes
using Bob Evans grilling sausage, visit http://www.BobEvans.com/Recipes

rpg400-l-bounces@xxxxxxxxxxxx wrote on 05/12/2009 08:50:55 AM:

I had suggested trying the PREPARE and EXECUTE USING combination? I just
did that myself, and the results are the same - invalid use of a
parameter marker.

I have a feeling this is not an IBM thing - it's an SQL standard - but
you might want to submit a DCR or a support call, asking for the DB team
to add the use of host variables or parameter markers in the subquery
which is the object of the AS in a CREATE TABLE statement.

Otherwise, create the entire string, concatenating in the value you are
testing, then use EXECUTE IMMEDIATE - one statement.

Michael_Schutte@xxxxxxxxxxxx wrote:

I see that documented everywhere but haven't found an explanation as to
why. It's not like I'm trying create a table with a host variable in

the

table. I'm just trying to select records. But doesn't matter anyway.

It

can be dropped. I've changed it to create the table first and then do

a

insert into.

--

Michael Schutte
Admin Professional

Try Bob Evans GRILLING SAUSAGE! This summerâs hottest destination is

your

own backyard with Bob Evans Brats and Italian Sausage! For tasty

recipes

using Bob Evans grilling sausage, visit http://www.BobEvans.com/Recipes

rpg400-l-bounces@xxxxxxxxxxxx wrote on 05/11/2009 11:10:43 AM:

Michael, I think the answer is simply that host variables are not
allowed on a CREATE statement.

Regards

Paul Tuohy
ComCon
www.comconadvisor.com
www.systemideveloper.com

Michael_Schutte@xxxxxxxxxxxx wrote:

Is this suppose to answer my question? Because I'm not following you.

I

understand that host variables are used in prepared statements but

why

are

they not permitted in this prepared statement?

Exec SQL
Create table qtemp/tmptable as (
select * from myfile
where company = :hostcpy) with data;

I'm wanting this run multiple times in the program, so reuse and
performance is needed.

What I don't get is that this is okay.

Exec SQL
Create table qtemp/tmptable as (
select * from myfile
where company = '001') with data;

--

Michael Schutte
Admin Professional

Try Bob Evans GRILLING SAUSAGE! This summer's hottest destination is

your

own backyard with Bob Evans Brats and Italian Sausage! For tasty

recipes

using Bob Evans grilling sausage, visit

http://www.BobEvans.com/Recipes

rpg400-l-bounces@xxxxxxxxxxxx wrote on 05/07/2009 06:47:29 PM:

Host variables are used in 'Prepared' statements. The reason for

that

is

as

the name suggests, they are prepared. ie they are created before

they

are

run, and when run, the host variables are passed to the already

prepared

statement as input values.
This is basically for performance reasons, as the prepared statement

can

then be reused multiple times efficiently

2009/5/7 <Michael_Schutte@xxxxxxxxxxxx>

Okay, I've found where is says that it's not allowed.

The select-statement must not refer to variables or include

parameter

markers.

But why, I dont see the explaination why? I'm not seeing why the

compiler

would care if I use a hard coded value or a host variable to select
records.

--

--
This is the RPG programming on the IBM i / System i (RPG400-L) mailing

list

To post a message email: RPG400-L@xxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/rpg400-l
or email: RPG400-L-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives
at http://archive.midrange.com/rpg400-l.

--
This is the RPG programming on the IBM i / System i (RPG400-L) mailing

list

To post a message email: RPG400-L@xxxxxxxxxxxx
To subscribe, unsubscribe, or change list options,
visit: http://lists.midrange.com/mailman/listinfo/rpg400-l
or email: RPG400-L-request@xxxxxxxxxxxx
Before posting, please take a moment to review the archives
at http://archive.midrange.com/rpg400-l.

>