KDb/About KDb: Difference between revisions

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'''Predicate is a database connectivity and creation library''', a new iteration of KexiDB library developed within [[Kexi]], part of the [[Calligra|Calligra Suite]] (formerly KOffice).
'''KDb is a database connectivity and creation library''', a new iteration of KexiDB library developed within [[Kexi]], part of the [[Calligra|Calligra Suite]] (formerly KOffice). It was recently known as Predicate.


'''Predicate is consisted of a general-purpose C++/Qt-only library and a set of plugins.''' Because there is no dependency on [[Kexi]], [[Calligra]] or even on KDE libraries, Predicate is developed for wider audience. At some point Kexi will use it too, thus deprecating [[Kexi/KexiDB|KexiDB]].
'''KDb is consisted of a general-purpose C++/Qt-only library and a set of plugins.''' Because there is no dependency on [[Kexi]], [[Calligra]] or even on KDE libraries, KDb is developed for a wider audience. Kexi since the version 3 uses it too, thus deprecating [[Kexi/KexiDB|KexiDB]].


'''Unlike QtSQL, Predicate 'knows' how to create database and new tables.''' It has a Qt/C++ API for that. There is no need to pass SQL at all but you can pass if you wish (it will silently parse your statements before contacting the database). Predicate is developed as a next generation database handling layer for Kexi and similar complex apps.  
'''Unlike QtSQL, KDb 'knows' how to create database and new tables.''' It has a Qt/C++ API for that. There is no need to pass SQL at all but you can pass if you wish (it will silently parse your statements before contacting the database). KDb is developed as a next generation database handling layer for Kexi and similar complex apps.  


The main downside at the moment: it's not yet released and its API isn't frozen, so early adopters need to install a copy of it. Once released source and binary compatibility will be maintained.
The main downside at the moment: it's not yet released and its API isn't frozen, so early adopters need to install a copy of it. Once released source and binary compatibility will be maintained.


'''Predicate is widely free/libre software available under the [http://en.wikipedia.org/wiki/LGPL GNU Lesser General Public License (LGPL)].''' Thus, developers are free to:
'''KDb is widely free/libre software available under the [http://en.wikipedia.org/wiki/LGPL GNU Lesser General Public License (LGPL)].''' Thus, developers are free to:
*use Predicate in applications
*use KDb in applications, also commercial
*extend it for specialized use cases
*extend it for specialized use cases
*contribute directly to Predicate
*contribute directly to KDb


==History==
==History==
Read about history of the project in the [http://commit-digest.org/issues/2010-12-12/ KDE Commit-Digest].
Read about history of the project in the [http://commit-digest.org/issues/2010-12-12/ KDE Commit-Digest].

Revision as of 07:47, 23 June 2015

KDb is a database connectivity and creation library, a new iteration of KexiDB library developed within Kexi, part of the Calligra Suite (formerly KOffice). It was recently known as Predicate.

KDb is consisted of a general-purpose C++/Qt-only library and a set of plugins. Because there is no dependency on Kexi, Calligra or even on KDE libraries, KDb is developed for a wider audience. Kexi since the version 3 uses it too, thus deprecating KexiDB.

Unlike QtSQL, KDb 'knows' how to create database and new tables. It has a Qt/C++ API for that. There is no need to pass SQL at all but you can pass if you wish (it will silently parse your statements before contacting the database). KDb is developed as a next generation database handling layer for Kexi and similar complex apps.

The main downside at the moment: it's not yet released and its API isn't frozen, so early adopters need to install a copy of it. Once released source and binary compatibility will be maintained.

KDb is widely free/libre software available under the GNU Lesser General Public License (LGPL). Thus, developers are free to:

  • use KDb in applications, also commercial
  • extend it for specialized use cases
  • contribute directly to KDb

History

Read about history of the project in the KDE Commit-Digest.