I am not the technical expert, but:
We maintain our database in the office using FilemakerPro.
The data from this is uploaded to a web based SQL database.
We are using php language.
It is not too complicated. Becasue of the scripting ability of FilemakerPro we automatically run a nightly search of the database for any model that has changed and upload the changed data.
The database contains up to 700 fields of data per model (depending on the type) and we have about 7000 models. We extract all this from company spec sheets and brochures.
We also sell our data in pocket books in 5 languages including German.
Are you interested in putting specification data on your Bau24 web site or just brochures?
Chris Wood
www.spec-checkeurope.com