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IDS Forum

RE: ESQL/C - Multiple cursors open to differen....

Posted By: Madison Pruet
Date: Friday, 23 December 2011, at 11:52 a.m.

In Response To: RE: ESQL/C - Multiple cursors open to differen.... (LARRY SORENSEN)

Larry,

The use of descriptors is not required to handle multiple open cursors and
multiple connections. The purpose of descriptors is to make it possible to
write programs when you don't know before hand what data types the table
will contain. For instance, the cdr utility makes heavy usage of
descriptors because when a users makes a request to check the data on a
table --- well we didn't code for that specific table when we wrote the
code. So we have to explore - and that means that we have to use
descriptors for just about everything.

While operations using descriptors allows for a high degree of dynamic
flexibility, they also require a bit more effort to use.

M.P.

From: "LARRY SORENSEN" <lsorensen25@msn.com>

To: ids@iiug.org

Date: 12/23/2011 10:30 AM

Subject: RE: ESQL/C - Multiple cursors open to differen.... [25723]

Sent by: ids-bounces@iiug.org

Art,

In reviewing your dbcopy.ec program to learn more about opening concurrent
connections to multiple databases, you use the DESCRIBE statement several
times to set up SQLDA structures to dynamically receive the SELECT data. I
have a question on how that works.

It appears that the DESCRIBE directive only gives you information on the
structure that you will need to received the data, and then you must use
that
information to malloc the actual necessary space for receiving the data. Is

this accurate?

Larry

> To: ids@iiug.org
> From: art.kagel@gmail.com
> Subject: Re: ESQL/C - Multiple cursors open to differen.... [25671]
> Date: Tue, 20 Dec 2011 05:56:00 -0500
>
> UNLOAD is a dbaccess command verb, the engine does not recognize it so
you
> can't do that from ESQL/C unless you write your own unload module in 'C'
> yourself. From an SQL script, executed by dbaccess, no problem.
>
> Art
>
> Art S. Kagel
> Advanced DataTools (www.advancedatatools.com)
> Blog: http://informix-myview.blogspot.com/
>
> 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, Dec 19, 2011 at 11:42 PM, Larry Sorensen
<lsorensen25@msn.com>wrote:
>
> > Another dilema -
> >
> > I am looking for the easiest way to do the following in an automated
> > fashion, preferably in an ESQL/C program, but possibly using an sql
script
> > as well: (two different databases on the same server)
> >
> > UNLOAD TO 'somefile' select * from database1.table1 where column1 in
> > (select
> > column 2 from database2.table2)
> >
> > Thanks.
> >
> > Larry
> >
> > -----Original Message-----
> > From: ids-bounces@iiug.org [mailto:ids-bounces@iiug.org] On Behalf Of
> > LARRY
> > SORENSEN
> > Sent: Wednesday, December 14, 2011 7:57 AM
> > To: ids@iiug.org
> > Subject: RE: ESQL/C - Multiple cursors open to differen.... [25612]
> >
> > Is the same information contained in the utils_ak program? I waited
until
I
> > was onsite to try and download your program and ftp is turned blocked.
I
> > can
> > use view to look at utils_ak, however.
> >
> > > To: ids@iiug.org
> > > From: art.kagel@gmail.com
> > > Subject: Re: ESQL/C - Multiple cursors open to differen.... [25602]
> > > Date: Tue, 13 Dec 2011 18:04:51 -0500
> > >
> > > At the IIUG site (www.iiug.org/software/software_index.html) under
> > > both the "Database Administration" and the "ESQL/C -ESQL/C
Environment
> > > or ESQL/C Source" sections (the latter list is shorter). Download the

> > package:
> > > utils2_ak.
> > >
> > > Art
> > >
> > > Art S. Kagel
> > > Advanced DataTools (www.advancedatatools.com)
> > > Blog: http://informix-myview.blogspot.com/
> > >
> > > 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 Tue, Dec 13, 2011 at 5:47 PM, LARRY SORENSEN <lsorensen25@msn.com>

> > wrote:
> > >
> > > > And your software is available at the IIUG site, or is it somewhere

> > else?
> > > >
> > > > > To: ids@iiug.org
> > > > > From: art.kagel@gmail.com
> > > > > Subject: Re: ESQL/C - Multiple cursors open to differen....
> > > > > [25600]
> > > > > Date: Tue, 13 Dec 2011 16:40:56 -0500
> > > > >
> > > > > Oh, the secret to having cursors open in multiple connections is
> > > > > to
> > > > create
> > > > > the connections with the "WITH CONCURRENT TRANSACTIONS" clause,
> > otherwise
> > > > > the cursors in a connection will close when you switch away from
> > > > > it to another connection!
> > > > >
> > > > > Art
> > > > >
> > > > > Art S. Kagel
> > > > > Advanced DataTools (www.advancedatatools.com)
> > > > > Blog: http://informix-myview.blogspot.com/
> > > > >
> > > > > 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 Tue, Dec 13, 2011 at 4:33 PM, LARRY SORENSEN
> > > > > <lsorensen25@msn.com>
> > > > wrote:
> > > > >
> > > > > > Does anyone have some sample programs using ESQL/C with a
couple
> > > > > > of database connections (two different databases)? I need to
> > > > > > open a SELECT cursor
> > > > from
> > > > > > one
> > > > > > database table and use the results on each FETCH INTO to UNLOAD

> > > > > > data
> > > > from
> > > > > > another database table. As I SELECT INTO from one database
> > > > > > table, I
> > > > then
> > > > > > UNLOAD from another database and table.
> > > > > >
> > > > > > Thanks
> > > > > >
> > > > > > Larry
> > > > > >
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > >
> > > >
> > >
> >
> >
****************************************************************************

> > ***
> > > > > > Forum Note: Use "Reply" to post a response in the discussion
forum.
> > > > > >
> > > > > >
> > > > >
> > > > > --14dae9340a51b9a1cb04b4001aa0
> > > > >
> > > > >
> > > > >
> > > >
> > > >
> > >
> >
> >
****************************************************************************

> > ***
> > > > > Forum Note: Use "Reply" to post a response in the discussion
forum.
> > > > >
> > > >
> > > >
> > > >
> > > >
> > >
> >
> >
****************************************************************************

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> > > > Forum Note: Use "Reply" to post a response in the discussion forum.

> > > >
> > > >
> > >
> > > --14dae934115112661b04b401478f
> > >
> > >
> > >
> >
> >
****************************************************************************

> > ***
> > > Forum Note: Use "Reply" to post a response in the discussion forum.
> > >
> >
> >
> >
****************************************************************************

> > ***
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> >
> >
> >
> >
>
*******************************************************************************

> > Forum Note: Use "Reply" to post a response in the discussion forum.
> >
> >
>
> --bcaec51a867237916004b483e94b
>
>
>
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