From kde-devel  Sat Oct 20 12:00:56 2012
From: Kevin Krammer <krammer () kde ! org>
Date: Sat, 20 Oct 2012 12:00:56 +0000
To: kde-devel
Subject: Re: How can I access to the Kadressbook, kCal and Kontact database
Message-Id: <201210201400.56489.krammer () kde ! org>
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Hi again :)

On Friday, 2012-10-19, Micha=EBl Parchet wrote:
> Hello,
>=20
> I would like to access and custumize the kCal, Kadressbook katabase. to u=
se
> this with my proprietary program. Have I the right to do this ?

Yes, all KDE platform libraries, including he ones for PIM related things, =
are=20
licence under the terms of the LGPL, which allows the usage in proprietary=
=20
applications.

Modifications to the libraries themselves, however, need to be licenced in =
a=20
compatible way. But it is unlikely that such modifications will be needed a=
t=20
all.

> I thought understand that the database Is a mysql database. How can I
> access and customize this ?

Data access is handled through a PIM data service called Akonadi.
The client library for that is part of the KDE platform's PIM libraries.
http://api.kde.org/4.x-api/kdepimlibs-apidocs/akonadi/html/index.html

There are basically two approaches for an application:
=2D low level job based API, e.g. using Akonadi::CollectionFetchJob[1] for=
=20
listing contact/calendar/email folders

=2D high level model/view based API, e.g. Akonadi::EntityTreeModel for=20
presenting folders and data items (contacts, events, emails) in the form of=
 a=20
QAbstractItemModel for use in Qt item views.

> I need the events and the contact adressbook but to use correctly this
> database. I must to add somme custom tables and property.

Can you give an example of such a customization?

> Can I do this or should I make my oven database for my program ?

That will likely depend on your actual needs.

> I this last case, how can use both database in parallel ?

You would access your database throught the QSql API. Assuming a MySQL back=
ed=20
Akonadi setup I am quite certain that mysqld would be able to handle that=20
additional connection.

Cheers,
Kevin

=2D-=20
Kevin Krammer, KDE developer, xdg-utils developer
KDE user support, developer mentoring

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