See below On Tue, Nov 4, 2008 at 7:31 AM, Clay Zhong <[EMAIL PROTECTED]> wrote:
> Hi Guys, > > I meet some problems when using Lucene 2.3.2. After a lot of research, I > still can't find any ways to solve them. Hope you can give me some > advice.. > > 1. Can I search different document from multi-index when they have > connections like FK in database? > For example, > Index Dir 1 (User): Field id, Field departmentId > Index Dir 2 (Department): Field id, Field location > How can I get all user that location is USA? > Well, I can index location into User, or search from Department first to > get departmentId. But they're really terrible, is there a better way? > Whenever you start thinking this way, step back, take a deep breath and remember that Lucene is a *text search* engine, not a database engine. Forget all you know about data normalization and construct your index so you do NOT have any conception of foreign keys. De-normalize your data so you can do this kind of thing with simple queries. Yes, this takes more room and it may not be reasonable. But unless and until you *know* you'll have space/performance problems, this should be your first approach. If that doesn't work, think about hybrid solutions where you put your text in a Lucene index and the data you really, really do need to use in a RDBMS way in a real-live database. If you search the archives you'll see this discussed in some detail. > > 2. How can I search from multi-index with one query? It's different from > using MultiSearcher. > For example, there's two fields, 'title' and 'content', when I search > 'Java and Lucene', how can I get documents which contains 'Java' in > 'title' and 'lucene' in 'content'? (not only 'Java and Lucene' in one > field). I can add a field contains both 'title' and 'content', but > that's really really bad solution.... > +title:java +content:lucene should do the trick, but you'll have to write your own code to know that the phrase "java and lucene" should be broken up this way. Best Erick > > That's all my questions, thanks for your patient. > > Best Wishes > Clay Zhong > > > --------------------------------------------------------------------- > To unsubscribe, e-mail: [EMAIL PROTECTED] > For additional commands, e-mail: [EMAIL PROTECTED] > >
