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xapian如何使用python实现的一个简单的范围查询的例子

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xapian通过python实现的一个简单的范围查询的例子

#!/usr/bin/env python
#
# Simple command-line ValueRangeProcessor example. Takes as an argument
# the value number to apply numeric ranges to.
#
# Copyright (C) 2003,2008 James Aylett
# Copyright (C) 2004,2007 Olly Betts
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License as
# published by the Free Software Foundation; either version 2 of the
# License, or (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301
# USA

import sys
import xapian

# We require at least three command line arguments.
if len(sys.argv) < 4:
    print >> sys.stderr, "Usage: %s PATH_TO_DATABASE VALUENO QUERY" % sys.argv[0]
    sys.exit(1)

# Open the database for searching.
database = xapian.Database(sys.argv[1])

# Start an enquire session.
enquire = xapian.Enquire(database)

# Combine the rest of the command line arguments with spaces between
# them, so that simple queries don't have to be quoted at the shell
# level.
query_string = " ".join(sys.argv[3:])

# Set up a NumberValueRangeProcessor on the right value
# It *must* be prefixed by '%' in the query (just to show how this is done).
rangeproc = xapian.NumberValueRangeProcessor(int(sys.argv[2]), '%')

# Parse the query string to produce a Xapian::Query object.
qp = xapian.QueryParser()
qp.add_valuerangeprocessor(rangeproc)
stemmer = xapian.Stem("english")
qp.set_stemmer(stemmer)
qp.set_database(database)
qp.set_stemming_strategy(xapian.QueryParser.STEM_SOME)
query = qp.parse_query(query_string)
print "Parsed query is: %s" % str(query)

# Find the top 10 results for the query.
enquire.set_query(query)
matches = enquire.get_mset(0, 10)

# Display the results.
print "%i results found." % matches.get_matches_estimated()
print "Results 1-%i:" % matches.size()

for m in matches:
    print "%i: %i%% docid=%i [%s]" % (m.rank + 1, m.percent, m.docid, m.document.get_data())


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