[Hibernate Search] Query and multiple result classes

fabreax · **Posted:** Tue Jul 24, 2007 9:30 am

Hello,

I have a question about a query and multiple result classes.

For example, I have Class1 and Class2 with Class2 embedded in Class1.

Both classes have an "att" attribute.
I want to made a search like that :

Code:

class2.att:"value1" AND class2.att:"value2"

but I think I can't do that, so I must do

Code:

att:"value1" AND att:"value2"

And I want the result is Class1 and Class2.

Code:

fullTextQuery = fullTextSession.createFullTextQuery( luceneQuery, Class1.class, Class2.class );

The problem is that I think

Code:

att:"value1"

will search on Class1.att and Class2.att, not just Class1.att

Is there any madder to specify in which class HSearch must search (without changing attribute names) ?

Thank you.

emmanuel · **Posted:** Wed Jul 25, 2007 3:10 pm

Do you mean?

Code:

class1.att:"value1" AND class2.att:"value2"

Then you can use the special DocumentBuilder.CLASS_FIELDNAME to constraint on the fully qualified class name. (I need to expose that properly at some point).

fabreax · **Posted:** Wed Jul 25, 2007 3:15 pm

Yes, it's what I mean :)

fabreax · **Posted:** Fri Jul 27, 2007 4:33 am

Hum, I tried to understand how to use DocumentBuilder.CLASS_FIELDNAME but I don't understand :S.

Could you explain me how to made queries with class constraint ?

emmanuel · **Posted:** Fri Jul 27, 2007 12:52 pm

"(" + DocumentBuilder.CLASS_FIELDNAME +":my.fq.ClassName AND attr1:constraint ) OR (" + DocumentBuilder.CLASS_FIELDNAME +":my.fq.ClassName2 AND attr1:constraint )"

fabreax · **Posted:** Fri Jul 27, 2007 1:08 pm

oh, thank you very much.

my.fq.ClassName is just the classname ? For example Class1 ?

fabreax · **Posted:** Mon Jul 30, 2007 8:44 am

In luke, _hibernate_class value is "com.demo.Entite".

I wrote that :

Code:

query = "_hibernate_class:com.demo.Entite";

But nothing was found. Then, I tried

Code:

query = "_hibernate_class:com.demo.Entite*";

And there are results. Is there spaces at the end of the classname ?

emmanuel · **Posted:** Mon Jul 30, 2007 3:52 pm

ah no but the queryParser tokenize all fields, so you might want to build the query programatically.

fabreax · **Posted:** Mon Jul 30, 2007 4:10 pm

Hum, I don't understand.

I must use

Code:

query = "_hibernate_class:\"com.demo.Entite\"";

to have the full string ?

emmanuel · **Posted:** Mon Jul 30, 2007 4:37 pm

no you need to use a TermQuery

fabreax · **Posted:** Tue Jul 31, 2007 2:51 am

I don't understand ^^

Currently, I use

Code:

org.apache.lucene.search.Query luceneQuery = parser.parse(stringQuery);

so you say that I muse use
extended by org.apache.lucene.search.TermQuery luceneQuery = parser.parse(stringQuery);
:S ?

fabreax · **Posted:** Tue Jul 31, 2007 8:15 am

emmanuel wrote:

"(" + DocumentBuilder.CLASS_FIELDNAME +":my.fq.ClassName AND attr1:constraint ) OR (" + DocumentBuilder.CLASS_FIELDNAME +":my.fq.ClassName2 AND attr1:constraint )"

I think this is equivalent to

Code:

class1.att:"value1" OR class2.att:"value2"

not

Code:

class1.att:"value1" AND class2.att:"value2"

I will rename my fields to have unique name, it's too complicated :S