Thanks for the infos, I've reached a working state far earlier than I've expected !
If the DB is not the same as the one MediaWiki is using, you will likely have to implement your own infrastructure. From what it seems to me, the current DB classes are not easily reusable. I may be wrong though.
That's what I did. I did not feel like digging in the mediawiki DB abstraction layer at this time. As this extension is not meant to be used by a large number of people, the increased load on the DB server is bareable.
A last quick question though : I use $wgOut->AddWikitext() to render some data from the tag defined by my extension. However, some wiki tag (like '' or ''') are correctly handled whereas others (* or #) are ignored (render as is). Am I overlooking something ?
Thanks in advance,
-- Boris Herbiniere-Seve