For PostgreSQL there is Tsearch2 [1], Oracle has built in full textsearch as far as I know, what about MySQL? I think it would be better touse special functions if they are available.[1] http://www.sai.msu.su/~megera/postgres/gist/tsearch/V2/
Don't forget openfts. http://openfts.sf.net/ -sc -- Sean Chittenden