Article on Predicate

[mutlu_inek]

Dear Jaroslaw,

Thank you for the quick response and your detailed explanation. Kexi does indeed have a complex history. I think all is clear now, however. I will edit the article tomorrow and send it to you for review.

Cheers,

mutlu


--- Jaroslaw Staniek <staniek at kde.org> schrieb am Sa, 8.1.2011:

> Von: Jaroslaw Staniek <staniek at kde.org>
> Betreff: Re: Article on Predicate
> An: "mutlu_inek" <mutlu_inek at yahoo.de>
> CC: digest at kde.org
> Datum: Samstag, 8. Januar, 2011 21:54 Uhr
> On 8 January 2011 18:04, mutlu_inek
> <mutlu_inek at yahoo.de>
> wrote:
> > Dear Commit-digest community and dear Jaroslaw,
> >
> > I proofread and corrected the Predicate article. Not
> every single quirk in its language has been fixed, but the
> article is quite readable now. There would be an advantage
> to reorganizing the article so that the argumentative
> structure is more intuitive, but that would take more work
> and I am not sure whether it would be welcome. I made tons
> of changes already. Regarding its language, I would say that
> it is nearly ready to go. There is one passage that remains
> unclear to me, however. I would be very happy, if someone
> could provide insights into what it is supposed to mean:
> >
> 
> Thanks for your support, mutlu!
> Below are corrections of my own mistakes; please let me
> know if
> something is still unclear.
> 
> > Paragraph 9:
> > "These are also built on top of KexiDB and that
> validated values of the abstraction layer in even for the
> client/server processing or even 3-tier architectures.
> During Kexi 1.1 times, Kexi offered a plugin > running
> its own web server..."
> 
> In the meantime Kexi Web Forms plugin have been developed
> as a Google
> Summer of Code 2008 project. Like any other, also this
> plugin accesses
> the database backend through the KexiDB abstraction. This
> development
> validated usefulness of KexiDB in client/server
> applications and even
> in 3-tier architectures. Web Forms was offered in Kexi 1.1
> with its
> own lighttpd-based web server.
> 
> >
> > The remaining issue with this article is that I am not
> sure whether the history of the project it represented
> accurately. In the beginning, it is claimed that KexiDB 1
> supported MySQL only,
> 
> I found some more info, so there's update:
> 
> In the beginning (2002) only MySQL and CQL++ [http://www.cql.com]
> database backends were supported by Kexi. Only a few
> database access
> features were abstracted (that would be called KexiDB
> version 0), and
> much of the dependent code was in the Kexi code itself. The
> CQL++
> backend (file-based) was then replaced in 2003 by SQLite
> what prompted
> to the development of KexiDB abstraction layer version 1,
> from
> scratch.
> 
> > Later on, however, it is mentioned that there was
> support for many more databases in KexiDB 1. I believe that
> the latter is correct, i.e. that KexiDB was the result of
> the need to support many DBs.
> 
> this is true but for KexiDB 2, please see below [1] for
> explanation
> 
> > and that the introduction of SQLite prompted its
> rewrite, which resulted (together with a porting to Qt4) in
> KexiDB 2.
> 
> this is not true, these were Qt 3 times; so rather "the
> introduction
> of SQLite prompted its rewrite, which resulted in KexiDB
> 1."
> 
> > The support for all but MySQL and SQLite, however, was
> dropped with the port to Qt4 (i.e. with creating KexiDB 2)
> and this is still the case for Predicate. If this is indeed
> correct, I will fix the article accordingly.
> 
> I made a big mistake in my text. Below is the correction
> regarding drivers.
> 
> OLD text: "KexiDB for Kexi 1 offered support for xBase
> (dBase), Sybase (and MS
> SQL Server) and Oracle backends. Support for these drivers
> in KexiDB 2
> (Kexi 2) has been removed, and this is also the case for
> Predicate.
> Maintainers for these are needed for Predicate."
> 
> NEW text: "KexiDB 1 supported MySQL, PostgreSQL, ODBC and
> SQLite 2 and
> SQLite 3.
> KexiDB 2 compared to version 1 initially increased number
> of supported
> backends thanks to a number of active contributors.
> Because of that, KexiDB 2 originally also supported xBase
> (dBase),
> Sybase (and MS SQL Server) and Oracle backends.
> [http://websvn.kde.org/trunk/koffice/kexi/kexidb/drivers/?pathrev=956576]
> During the development KexiDB 2 and porting to Qt 4,
> however, support
> for anything but MySQL, PostgreSQL, and SQLite 3 has been
> dropped;
> also this is also the case for Predicate.
> Maintainers for the disabled backends are needed for
> Predicate. The
> old source code is possible for reuse."
> 
> I'd like to add something important regarding supporters:
> 
> "There were at least two companies supporting KexiDB
> development.
> AutomatiX GmbH which hosts kexi-project.org also supported
> improvements in 2003
> [http://websvn.kde.org/?view=revision&revision=231391].
> OpenOffice
> Software LLC owns a lot of credits as it was the sponsor of
> the core
> developer of KexiDB and Kexi, Jarosław Staniek, in
> 2003-2007
> [http://openoffice.com.pl/en/]."
> 
> -- 
> regards / pozdrawiam, Jaroslaw Staniek
>  http://www.linkedin.com/in/jstaniek
>  Kexi & Calligra (kexi-project.org, identi.ca/kexi,
> calligra-suite.org)
>  KDE Software Development Platform on MS Windows
> (windows.kde.org)
>