[Xapian-discuss] having trouble with prefixes

[Christopher Harvey]

Olly Betts <olly at survex.com> writes:
> On Sun, Sep 01, 2013 at 10:37:59PM -0400, Christopher Harvey wrote:
>> I've got a small test database setup with one record.
>> $ delve -r 1 -V /tmp/1/
>> Values for record #1: 0:DD4F2162FFFF0E43741A4A1C2B8EC0E7 1:./Text_page_scan_2.jpg 2:jpg 3:.jpg
>> Term List for record #1: E:.jpg P:./Text_page_scan_2.jpg Q:DD4F2162FFFF0E43741A4A1C2B8EC0E7 T:jpg
>> 
>> The terms were added with lines like this:
>> 	doc.add_term(string("P:") + path);
>
> Just add the prefix "P" here.
>
>> Problem is, I can't seem to run a query that returns the document using
>> any of the terms. Here is the outline of the code that runs the queries
>> I'm trying to run:
>> 
>> 	Database db(db_path.string());
>> 	QueryParser queryparser;
>> 	Stem stemmer("english");
>> 	//queryparser.set_stemmer(stemmer);
>> 	queryparser.set_database(db);
>> 	queryparser.add_prefix("type", "T");
>> 	queryparser.add_prefix("md5sum", "Q");
>> 	queryparser.add_prefix("path", "P");
>
> Or if you really want that colon in there, add the prefix as "P:" here.

works! Thanks!

well, more precisely it works for everything except path names. I was
reading the docs here:
http://xapian.org/docs/queryparser.html

and saw the paragraph on punctuation:
---
A phrase surrounded with double quotes ("") matches documents containing
that exact phrase. Hyphenated words are also treated as phrases, as are
cases such as filenames and email addresses (e.g. /etc/passwd or
president at whitehouse.gov).
---

using almost exactly the same code as last time, I fed it the following
query:
path:"foo.bar"
printing query.get_description() produces the following:
Query is 'Xapian::Query((P:foo:(pos=1) PHRASE 2 P:bar:(pos=2)))'
I was expecting a query with one term, since the "foo.bar" was
quoted. Consequently I can't match terms stored in the database that
have "." characters.

thanks again!
Chris