From: Michael Meskes <meskes@postgresql.org>
To: Martin Jackson <mhjacks@nwa.quik.com>
Cc: pgsql-interfaces@postgresql.org
Subject: Re: [INTERFACES] ESQL/C Docs: Request for code
Date: Sun, 12 Dec 1999 15:18:57 +0100
Message-ID: <19991212151857.A548@fam-meskes.de> (raw)
In-Reply-To: <3852B326.D68C6BE2@nwa.quik.com>
References: <3852B326.D68C6BE2@nwa.quik.com>
On Sat, Dec 11, 1999 at 02:25:10PM -0600, Martin Jackson wrote:
> I am looking for examples of working ECPG code. Partly I would like to
There are some in the source code under test/.
> see for myself how it works, but I would also be willing to write some
> documentation on it, which I would be willing to submit to the CVS tree.
Great. :-)
> I do not understand, for example, how to handle cursors in ECPG because
> I have not found any examples of doing so in the documentation I have.
> Others have probably had the same problem.
Cursors are used in the test examples.
> I am familiar with the Informix ESQL/C implementation, if that matters.
It should be the same for the most part. I'm interested in hearing about all
differences you find.
> 1) How do you set up a fetch operation? Is there a nicer way to do it
> in EC without a cursor? That is,
>
> DECLARE foo CURSOR FOR
> SELECT * FROM bar
> WHERE baz = :bazval
>
> {time passes}
>
> FETCH foo INTO :bletch, :foo2;
SELECT * INTO :bletch, :Bazval FROM bar where baz = :bazval
> 2) Can you PREPARE (i.e. cache) statements for later execution?
> EXEC SQL DELETE FROM foo
> WHERE baz = ?
Yes.
> 3) Does Postgres directly support placeholders (?)? I've used them in
> DBI, but I don't know whether that's some hack by the Postgres driver
> author or if it's an actual Postgres feature?
Yes. You can use it directly in statements you prepare.
> 4) What kind of scope do declared cursors have?
I'm not exactly sure but I think it has to be the module i.e. source file.
> 5) (META-QUESTION): Is ECPG suitable for a large system, i.e. an
> accounting system for a small business?
It should yes. If there is a problem ECPG will be fixed.
Michael
--
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To: pgsql-interfaces@postgresql.org
Cc: meskes@postgresql.org, mhjacks@nwa.quik.com
Subject: Re: [INTERFACES] ESQL/C Docs: Request for code
In-Reply-To: <19991212151857.A548@fam-meskes.de>
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