Searching across multiple fields

[Aditi Goyal <ad...@gmail.com>]

Hi,

Lets say I have an index with the following fields:
field1, field2, field3 and field4 where all the fields can have same values.

Now I want to search a document where "basket" and "apple" are part of the
whole document but "orange" is not.

I have tried using MultiFieldQueryParser but it is not showing correct
results.

I typed the command ("basket" AND "apple") NOT "orange" for the
MultiFieldQueryParser

query = lucene.MultiFieldQueryParser.parse(command, fields, shoulds,
analyzer )
hits = self.searcher.search(query)


Am I doing something wrong? Please help.

Thanks,
Aditi

Re: Searching across multiple fields

[prabin meitei <pr...@gmail.com>]

Hi,
   Try using Boolean Query. You can effectively use boolean operators  using
it.
make seperate queries for each field.
Boolean query is meant for having a series of queries with boolean operators
defined.

For eg.
  lets say you have 3 diff queries A, B, C and you want a final query which
behaves as  A && (B || C)
BooleanQuery query = new BooleanQuery();
BooleanQuery temp = new BooleanQuery();
temp.add(B, Occur.SHOULD); //Occur.SHOULD is equvalent to OR operator
temp.add(C, Occur.SHOULD);
query.add(A, Occur.MUST); //Occur.MUST is equivalent to an AND operator
query.add(temp, Occur.Must);

Now "query" = A && (B || C)


Check out the documentation of Boolean Query.

Prabin
toostep.com

On Mon, Nov 17, 2008 at 6:28 PM, Aditi Goyal <ad...@gmail.com> wrote:

> Hi,
>
> Lets say I have an index with the following fields:
> field1, field2, field3 and field4 where all the fields can have same
> values.
>
> Now I want to search a document where "basket" and "apple" are part of the
> whole document but "orange" is not.
>
> I have tried using MultiFieldQueryParser but it is not showing correct
> results.
>
> I typed the command ("basket" AND "apple") NOT "orange" for the
> MultiFieldQueryParser
>
> query = lucene.MultiFieldQueryParser.parse(command, fields, shoulds,
> analyzer )
> hits = self.searcher.search(query)
>
>
> Am I doing something wrong? Please help.
>
> Thanks,
> Aditi
>