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| '''This page will be moved to [[Predicate]] when Kexi moves to Predicate.'''
| | #REDIRECT [[KDb]] |
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| *[[/KexiDB Drivers/]]
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| ==libCalligraDB==
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| The Task: Move core parts of KexiDB lib from kexi/kexidb to calligra/libs/db (libcalligradb) for reuse by Word's Biblio module and possibly other places in Calligra.
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| '''Status:''' in master (2.6) since 2012-07-11
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| '''Detailed changes:'''
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| * GUI- or Kexi-related bits such as validators are still in Kexi
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| * Only the SQLite3 driver is moved to libcalligradb, others stay within Kexi
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| ** thus, calligra libs depend on the driver, i.e. depend on SQLite3 (this was the case already for Words and Kexi)
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| ** calligra libs depend on ICU as well for proper unicode handling (which is dependency of Qt 5 anyway)
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| * Predicate library, as a Qt-only component, will replace functionality of the calligradb lib
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| * sqlitedump tool used for database for interactive database compacting stays in Kexi; if needed could be moved to libs/ too
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| * a few functions from libkexiutils moved to libcalligradb, so libkexiutils is not dependency
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| * for simplicity/API stability, namespace stays as KexiDB
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| * README.PACKAGERS file updated
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| '''Plans:'''
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| *port the biblio db storage from plain QtSQL to libcaligradb (smitpatel)
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| *support from jstaniek
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| ===Minutes from IRC meeting===
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| *2012-07-03
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| *requested by jstaniek
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| *attended by boemann, jstaniek, smitpatel
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| *idea: storage for bibliography could re-use libKexiDB instead of libQtSQL
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| *pros:
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| **simplify the code
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| **increase code re-use - KexiDB is developed 8+ years already with reuse in mind
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| **make the database ($HOME/.calligra/biblio.sqlite) accesible to Kexi, so biblio db can be added to the 'Kexi Scientific' family of templates for data re-use and manipulation
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| **KexiDB has database and table creation API, hides SQL complexity, QtSQL does not (what may result in code complexity in Words)
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| *cons and questions:
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| **size of libKexiDB as dependency (Biblio already uses SQLite3, which is the biggest dependency compared to either QtSQL or KexiDB anyway)
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| **we're moving to predicate in Kexi (but that would happen no earlier than in 3.0, realistically in 3.1 or 3.2), so KexiDB is here for the transition period
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| **are the APIs stable? (yes, most changes happen in Predicate, moreover KexiDB is Calligra's internal API, so will be updated with the apps and the Biblio code)
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| **Words cannot depend on Kexi (it wouldn't, relevant parts of KexiDB should be moved to calligra/libs/)
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| *extra points, from Kexi's perspective
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| **According to plans, Kexi will have biblio-feature db in 3.x anyway as a template, which ideally would depend on Words too. With kexidb reuse we would avoid incompatible two databases, avoid extra work, and avoid two Biblio products.
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| **For now Kexi lacks templates that are real world and integrated with other Calligra apps. The Biblio initiative helps here.
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| *current state: smitpatel delivered QtSQL-based code for Biblio (within GSoC 2012), jstaniek thinks it has bits (db and table creation) already handled in KexiDB
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| *'''final agreement has been reached: KexiDB adoption in Biblio'''
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| **smitpatel already studied kexi/tests/newapi sample code and claims it looks pretty straight forward for use in Biblio
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| **Biblio can be still kept small enough after using with KexiDB, in fact codebase size of Biblio will decrease
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| **Kexi is not exposed to Words' users in any way; conversely - users may find the connection in Kexi if they decide
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| **jstaniek offers to move relevant part of KexiDB to calligra/libs/ '''ASAP'''
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| ***the library renames to calligradb and the dir is calligra/libs/db/ (to avoid references to Kexi)
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| ***missing bits of the API needed by Biblio can be added (since there's no BC/SC requirement in KexiDB)
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| **jstaniek offers support for smitpatel in KexiDB use
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| **jstaniek offers support for porting to Predicate when Predicate arrives
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| **jstaniek offers maintaining the libcalligradb for Qt 5.0
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| **jstaniek proposes to keep KexiDB namespace in libcalligradb however since it defines API which is heavily used in Kexi (3200+ times); after moving to Predicate it won't be a problem
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| **all devs want to avoid changes of the db format so the current QtSQL-based code even if released, will be marked as experimental, before moving to KexiDB
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