What I wanted to do was to set at least one "SHOULD" field as required in a MFQP. Because of the MUST field I had, even if no SHOULD field matched the query, all the documents which had the corresponding MUST field were returned. I found a very easy solution to solve my problem ::
BooleanQuery myQuery = (BooleanQuery)myMFQP.parse(queries, fields, booleanClauses, analyzer) myQuery.setMinimumNumbersShouldMatch(1) mySearcher.search(myQuery) And it worked ! Now my results must have at least one "SHOULD" field that matches the query. Thanks for your explanations ! 2009/2/1 Erick Erickson <erickerick...@gmail.com> > I think query.toString() is your friend here. I'm having a hard > time figuring out, from your description, what you actually want, > so maybe some examples would help too. > > If your users enter terms for each field, then it seems to me that > you'd want MUST between clauses (in which case MultiFieldQueryParser > seems unnecesary). That is, if your form is somethinng like > title: <user enters term> > description: <user enters another term> > category: <user enters category> > > If you have them enter just a single term, that is your form looks > something like > word:<user enters term to find in title OR description OR etc> > category: <user enters category> > > and want to form a query like > (title:term OR description:term OR etc:term) AND category:cat, it's not > clear from the docs how you would create this in a *single* MFQP. But > you could easily use MFQP to form the (a OR b OR c) clause, add that > to a BoleanQuery with MUST, and then create your simple query on > category and add *that* as a second MUST clause in your BooleanQuery > and use that for your search. > > HTH > Erick > > > On Sun, Feb 1, 2009 at 5:33 AM, Sylvain <sylvainterside...@gmail.com> > wrote: > > > Hello everybody, > > > > I have a search app in which the user can specify in which category the > > documents he's searching are. So all my indexed documents have a > > "category" field as well as other fields such as title, description, > > etc. So when the user enters his query, only the documents that are in > > the given category and which match a part of the query must be returned. > > > > So I tried to use a MultiFieldQueryParser with SHOULD clauses on the > > title, description, etc and a MUST clause on the category field. It > > works pretty well but the problem is that _all_ the documents in the > > searched category are returned, even if they don't have any similarity > > with the search string (except for the category of course). > > > > I think that's because of the MUST field which takes precedence on the > > SHOULD fields or something like that ? I saw in the BooleanQuery the > > method setMinimumNumberShouldMatch(). I think I should use this with my > > MultiFieldQueryParser to set a minimum of 1 or 2 fields, but this method > > only exists for BooleanQuery instances so I can't use it... I thought > > about using directly a BooleanQuery but I want to use the FrenchAnalyzer > > for the request. > > > > Any idea on how to achieve this ? > > > > Thanks for your help ! > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: java-user-unsubscr...@lucene.apache.org > > For additional commands, e-mail: java-user-h...@lucene.apache.org > > > > >
