IDS Forum

Re: RE: using ? in "in"

Posted By: Art Kagel
Date: Wednesday, 13 October 2010, at 2:22 p.m.

In Response To: RE: RE: using ? in "in" (Wyza, Jonathon)

OK, my mistake or my lack of understanding how they implemented the external
tables file checking. Quick and dirty, you can still do this, it's just a
bit hinkey. Here's the scoop:

- The files listed in the DATAFILES clause don't have to exist at the

time that the external table is created, but they do have to exist at the

time the data is accessed.

- Here's the hinkey part. Although the manual calls the %r(n..m) macro a

"wild card" it is not. It is expanded internally, at the time the files are

opened, into a list of all possible filenames. The engine then tries to

open all of the files. If it encounters any errors, it reports the error

and lists the name of the last expanded filename that it received an error

on. So, in your case, file mwu_adr_tmp.1432 existed, but files

mwu_adr_tmp.1 through mwu_adr_tmp.1431 and mwu_adr_tmp.1433 through

mwu_adr_tmp.99999 did not so it reported an errorno 2 (file doesn't exist)

on that last file mwu_adr_tmp.99999.

So, what's the workaround? You have to touch an empty file for every
possible filename. Here, from my testing:

echo "1|1|" >test.1
echo "2|3|" >>test.1
dbaccess big_test -
> create external table testtbl( one int, two int) using (format
'delimited', delimiter '|', datafiles("disk:/home/art/test.%r(1..99)"));

Table created.

> !ix=1; while [[ ix -le 99 ]]; do touch test.$ix; ix=$(( ix + 1 )); done
> select * from testtbl;

one two

1 1

2 3

2 row(s) retrieved.

> ! rm test.9
> select * from testtbl;

26154: Could not open file: (file, errno)=(/home/art/test.9,2).
Error in line 1
Near character position 20
> !echo "9|10|" > test.9
> select * from testtbl;

one two

9 10

1 1

2 3

3 row(s) retrieved.

> select * from testtbl where one = 9;

one two

9 10

1 row(s) retrieved.

> ^D

Told you it's a bit hinkey! So, it is impractical to use the pid of the
process as the key for the job in the filename - though you could still use
it for the key value in the external table. You'll have to use a small
integer that's only big enough to allow for all of the concurrent jobs and
figure out a way to assign the numbers to particular jobs either permanently
or dynamically.

Hmm, or just append the lines to a single file.

Art

Art S. Kagel
Advanced DataTools (www.advancedatatools.com)
IIUG Board of Directors (art@iiug.org)

Disclaimer: Please keep in mind that my own opinions are my own opinions and
do not reflect on my employer, Advanced DataTools, the IIUG, nor any other
organization with which I am associated either explicitly, implicitly, or by
inference. Neither do those opinions reflect those of other individuals
affiliated with any entity with which I am affiliated nor those of the
entities themselves.

On Wed, Oct 13, 2010 at 11:22 AM, Wyza, Jonathon <wyzaj@bethelcollege.edu>wrote:

> So I did the following:
>
> create external table mwu_adr_tmp ( jobid int, id int )
> USING ( FORMAT 'DELIMITED', DELIMITER '|', DATAFILES
> ("DISK:/tmp/mwu_adr_tmp.%r(1..99999)"));
>
> Which worked, and I created a file with openable permissions :
> /tmp/mwu_adr_tmp.1342 , but if I use this sql:
>
> select * from mwu_adr_tmp
> # ^
> #26154: Could not open file: (file, errno)=(mwu_adr_tmp.99999,2).
> #
>
> Thoughts?
>
> Jonathon Wyza
> CX & CBORD System Administrator
> CX Programmer/Analyst
> Administrative Computing
> Bethel College
> (574)-257-3381
> AIM: Iamwyza
> jonathon.wyza@bethelcollege.edu
> ==============================
> SLES 11x64 & IDS 11.50.FC6
>
> "Don't document the problem, fix it."
> - Atli Björgvin Oddsson
>
> -----Original Message-----
> From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of Art
> Kagel
> Sent: Monday, October 11, 2010 8:05 PM
> To: ids@iiug.org
> Subject: Re: RE: using ? in "in" [21631]
>
> Naw, it's simpler than that. The underlying file that an external table
> maps
> into the data doesn't actually have to exist, so, all you have to do is
> include a file or run identifier in the file's records and map the table to
> a
> wildcard representation of the filename(s). Then multiple jobs can map in
> their own files and in the IN clause sub-query select .... where jobid =
> myjobid. So the external table would be defined as something like:
>
> create external table value_lists (
>
> jobid int,
>
> value_id in
> )
> USING ( FORMAT DELIMITED DELIMITER ''|' ) DATAFILES (
> DISK:/value_files_dir/value_file.%r(1..99999));
>
> Now each job can create a file that has lines like:
> <jobnum>|value1|
> <jobnum>|value2|
> .....
>
> and name the file /value_files_dir/value_file.<jobnum>
>
> and the IN clause looks like:
>
> ..... IN (SELECT value_id FROM value_lists WHERE jobid = <jobnum>)...
>
> After the job completes just delete, move, or rename the job's values file
> and
> IDS won't know that it exists anymore. Existing jobs that have the file
> open
> will still see its data, but since the records in that file don't contain
> the
> other job's jobid they won't see the rows in there anyway.
>
> Art
>
> Art S. Kagel
> Advanced DataTools (www.advancedatatools.com) IIUG Board of Directors
> (art@iiug.org)
>
> Disclaimer: Please keep in mind that my own opinions are my own opinions
> and
> do not reflect on my employer, Advanced DataTools, the IIUG, nor any other
> organization with which I am associated either explicitly, implicitly, or
> by
> inference. Neither do those opinions reflect those of other individuals
> affiliated with any entity with which I am affiliated nor those of the
> entities themselves.
>
> On Mon, Oct 11, 2010 at 7:44 PM, Wyza, Jonathon
> <wyzaj@bethelcollege.edu>wrote:
>
> > That might work, except it appears that external tables are not
> > capable of being temporary and must have unique system wide names.
> > Since this process has the capability of being run more than once at a
> > time then that could present problems. Beyond that I'd have to make
> > sure it was dropped after the process finished. Obviously i could use
> > a begin_work statement (and thus if the program exited then it would
> > rollback), but then it would log all the work, which i really don't
> > need it to do.
> >
> > Jonathon Wyza
> > CX & CBORD System Administrator
> > CX Programmer/Analyst
> > Administrative Computing
> > Bethel College
> > (574)-257-3381
> > AIM: Iamwyza
> > jonathon.wyza@bethelcollege.edu
> > ==============================
> > SLES 11x64 & IDS 11.50.FC6
> >
> > "Don't document the problem, fix it."
> > - Atli Björgvin Oddsson
> >
> > ________________________________________
> > From: ids-bounces@iiug.org [ids-bounces@iiug.org] on behalf of John
> > Miller iii [miller3@us.ibm.com]
> > Sent: Monday, October 11, 2010 6:52 PM
> > To: ids@iiug.org
> > Subject: RE: RE: using ? in "in" [21628]
> >
> > Have you considered external tables? This does require the
> > load/unload=
> >
> > file to be
> > accessible from the database server.
> >
> > John F. Miller III
> > STSM, Embedability Architect
> > miller3@us.ibm.com
> > 503-578-5645
> > IBM Informix Dynamic Server (IDS)
> >
> > ids-bounces@iiug.org wrote on 10/11/2010 01:54:26 PM:
> >
> > > [image removed]
> > >
> > > RE: RE: using ? in "in" [21624]
> > >
> > > Wyza, Jonathon
> > >
> > > to:
> > >
> > > ids
> > >
> > > 10/11/2010 01:54 PM
> > >
> > > Sent by:
> > >
> > > ids-bounces@iiug.org
> > >
> > > Please respond to ids
> > >
> > > True, but it seems faster in perl to do this:
> > >
> > > INSERT INTO temp_table(id) VALUES (list of values that goes to
> > > charac=
> > ter
> > > limit); #run until we run out of values
> > >
> > > Than to do this
> > >
> > > While(list of values)
> > > INSERT INTO temp_table(id) VALUES(value)
> > >
> > > I'd pay good money for the load from file to not be a isql/dbaccess
> > > only thing and to work in DBI.
> > >
> > > Jonathon Wyza
> > > CX & CBORD System Administrator
> > > CX Programmer/Analyst
> > > Administrative Computing
> > > Bethel College
> > > (574)-257-3381
> > > AIM: Iamwyza
> > > jonathon.wyza@bethelcollege.edu
> > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3
> > > D=
> > =3D=3D=3D=3D=3D=3D=3D
> > > SLES 11x64 & IDS 11.50.FC6
> > >
> > > "Don't document the problem, fix it."
> > > - Atli Bj=F6rgvin Oddsson
> > >
> > > -----Original Message-----
> > > From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf
> > > Of=
> > Art
> >
> > > Kagel
> > > Sent: Monday, October 11, 2010 4:14 PM
> > > To: ids@iiug.org
> > > Subject: Re: RE: using ? in "in" [21621]
> > >
> > > 64K actually. But putting the list of values into temp table also
> > > sol=
> > ves
> > the
> > > max statement length problem.
> > >
> > > Art
> > > On Oct 11, 2010 3:26 PM, "Wyza, Jonathon" <wyzaj@bethelcollege.edu>
> > wrote:
> > > > Nah, the problem is the limit in the size of the string. I was
> > > > hopi=
> > ng
> > > > to
> > > get
> > > > around the 32k character limit.
> > > >
> > > > Jonathon Wyza
> > > > CX & CBORD System Administrator
> > > > CX Programmer/Analyst
> > > > Administrative Computing
> > > > Bethel College
> > > > (574)-257-3381
> > > > AIM: Iamwyza
> > > > jonathon.wyza@bethelcollege.edu
> > > > =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> > > > =3D=
> > =3D=3D=3D=3D=3D=3D=3D
> > > > SLES 11x64 & IDS 11.50.FC6
> > > >
> > > > "Don't document the problem, fix it."
> > > > - Atli Bj=F6rgvin Oddsson
> > > >
> > > > -----Original Message-----
> > > > From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf
> > > > =
> > Of
> > > > Walt
> > >
> > > > Hultgren
> > > > Sent: Monday, October 11, 2010 3:07 PM
> > > > To: ids@iiug.org
> > > > Subject: Re: using ? in "in" [21617]
> > > >
> > > > If you know the number of values, either by program logic or by
> > > > collecting
> > > and
> > > > scanning user input, you could build the query string with the
> > > > appropriate
> > >
> > > > number of question marks before it's prepared.
> > > >
> > > > Walt.
> > > >
> > > > On Oct 11, 2010, at 2:54 PM, Art Kagel wrote:
> > > >
> > > >> You can but you need one for each item in the list. You can't
> > > >> just=
> >
> > > >> use one ? for the whole list. For a variable length list use a
> > > >> tem=
> > p
> > table.
> > > >>
> > > >> Art
> > > >> On Oct 11, 2010 2:34 PM, "Wyza, Jonathon"
> > > >> <wyzaj@bethelcollege.edu=
> > >
> > > >> wrote:
> > > >>
> > > >> --00163630ee9fdea2c004925be309
> > > >>
> > > >>
> > > >>
> > > >
> > > >
> > >
> > >
> > >
> > **********************************************************************
> > *=
> > ********
> >
> > >
> > > >> Forum Note: Use "Reply" to post a response in the discussion
> > > >> forum=
> > ...
> > > >>
> > > >
> > > > --
> > > > Walt Hultgren
> > > > walt.hultgren@emory.edu
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > **********************************************************************
> > *=
> > ********
> >
> > >
> > > > Forum Note: Use "Reply" to post a response in the discussion
> > > > forum.=
> >
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > **********************************************************************
> > *=
> > ********
> >
> > >
> > > > Forum Note: Use "Reply" to post a response in the discussion
> > > > forum.=
> >
> > > >
> > >
> > > --000e0cd30b74875c6d04925cfe58
> > >
> > >
> > >
> > **********************************************************************
> > *=
> > ********
> >
> > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > >
> > >
> > >
> > **********************************************************************
> > *=
> > ********
> >
> > > Forum Note: Use "Reply" to post a response in the discussion forum.=
> >
> > >=
> >
> >
> >
> >
>
>
> *******************************************************************************
> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
> >
> >
> >
>
>
> *******************************************************************************
> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
> >
>
> --000e0cd157441dbae704926038dd
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
>
>
>
> *******************************************************************************
> Forum Note: Use "Reply" to post a response in the discussion forum.
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>

--0016364eecfe92d3db049283ad98

Messages In This Thread

• using ? in "in"
  Wyza, Jonathon -- Monday, 11 October 2010, at 2:34 p.m.
  • Re: using ? in "in"
    Art Kagel -- Monday, 11 October 2010, at 2:54 p.m.
    • Re: using ? in "in"
      Walt Hultgren -- Monday, 11 October 2010, at 3:07 p.m.
      • RE: using ? in "in"
        Wyza, Jonathon -- Monday, 11 October 2010, at 3:26 p.m.
        • Re: RE: using ? in "in"
          Art Kagel -- Monday, 11 October 2010, at 4:13 p.m.
          • RE: RE: using ? in "in"
            Wyza, Jonathon -- Monday, 11 October 2010, at 4:54 p.m.
            • Re: RE: using ? in "in"
              Fernando Nunes -- Monday, 11 October 2010, at 5:12 p.m.
            • Re: RE: using ? in "in"
              Art Kagel -- Monday, 11 October 2010, at 5:34 p.m.
            • Re: RE: using ? in "in"
              Art Kagel -- Monday, 11 October 2010, at 5:59 p.m.
            • RE: RE: using ? in "in"
              John Miller iii -- Monday, 11 October 2010, at 6:52 p.m.
              • RE: RE: using ? in "in"
                Wyza, Jonathon -- Monday, 11 October 2010, at 7:44 p.m.
                • RE: RE: using ? in "in"
                  John Miller iii -- Monday, 11 October 2010, at 7:58 p.m.
                  • Re: RE: using ? in "in"
                    Art Kagel -- Monday, 11 October 2010, at 8:12 p.m.
                • Re: RE: using ? in "in"
                  Art Kagel -- Monday, 11 October 2010, at 8:04 p.m.
                  • RE: RE: using ? in "in"
                    Wyza, Jonathon -- Tuesday, 12 October 2010, at 9:59 a.m.
                    • Re: RE: using ? in "in"
                      Fernando Nunes -- Tuesday, 12 October 2010, at 10:12 a.m.
                      • Re: RE: using ? in "in"
                        Art Kagel -- Tuesday, 12 October 2010, at 10:17 a.m.
                        • Re: RE: using ? in "in"
                          Fernando Nunes -- Tuesday, 12 October 2010, at 10:50 a.m.
                    • Re: RE: RE: using ? in "in"
                      Art Kagel -- Tuesday, 12 October 2010, at 10:16 a.m.
                  • RE: RE: using ? in "in"
                    Wyza, Jonathon -- Wednesday, 13 October 2010, at 11:22 a.m.
                    • Re: RE: using ? in "in"
                      Art Kagel -- Wednesday, 13 October 2010, at 2:22 p.m.

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