function search($dbpath, $querystring, $offset = 0, $pagesize = 10)
{
// offset - defines starting point within result set
// pagesize - defines number of records to retrieve
// Open the database we're going to search.
$db = new XapianDatabase($dbpath);
### Start of example code.
// Set up a QueryParser with a stemmer and suitable prefixes
$queryparser = new XapianQueryParser();
$queryparser->set_stemmer(new XapianStem("en"));
$queryparser->set_stemming_strategy(XapianQueryParser::STEM_SOME);
$queryparser->add_prefix("title", "S");
$queryparser->add_prefix("description", "XD");
$queryparser->add_boolean_prefix("material", "XM");
// And parse the query
$query = $queryparser->parse_query($querystring);
### End of example code.
// Use an Enquire object on the database to run the query
$enquire = new XapianEnquire($db);
$enquire->set_query($query);
// Set up a spy to inspect the MAKER value at slot 1
$spy = new XapianValueCountMatchSpy(1);
$enquire->add_matchspy($spy);
// Retrieve the matches and compute start and end points
$matches = $enquire->get_mset($offset, $pagesize);
$start = $matches->begin();
$end = $matches->end();
// Use an array to record the DocIds of each match
$docids = array();
while (!$start->equals($end)) {
// retrieve the document and its data
$doc = $start->get_document();
$fields = json_decode($doc->get_data());
$position = $start->get_rank() + 1;
// record the docid
$docid = $start->get_docid();
$docids[] = $docid;
// display the results
printf("%d: #%03d %s\n", $position, $docid, $fields->TITLE);
// increment MSet iterator and our counter
$start->next();
}
// Parse and display the spy values
$spy_start = $spy->values_begin();
$spy_end = $spy->values_end();
while (!$spy_start->equals($spy_end)) {
print sprintf("Facet: %s; count: %d\n", $spy_start->get_term(), $spy_start->get_termfreq());
$spy_start->next();
}
// Finally, make sure we log the query and displayed results
log_info(sprintf("xapian.search:'%s'[%d:%d] = %s", $querystring, $offset, $offset + $pagesize, implode(" ", $docids)));
}
/**
* Queries the database.
* The xapian_query function queries the database using both a query string
* and application-defined terms. Based on drupal-xapian
*
* @param string $query_string The search string. This string will
* be parsed and stemmed automatically.
* @param XapianDatabase $db Xapian database to connect
* @param int $start An integer defining the first
* document to return
* @param int $length The number of results to return.
* @param array $extra An array containing arrays of
* extra terms to search for.
* @param int $count_type Number of items to retrieve
* @return array An array of nids corresponding to the results.
*/
function xapian_query($query_string, $db = NULL, $start = 0, $length = 10, $extra = array(), $count_type = 0)
{
try {
if (!is_object($db)) {
$db = new XapianDatabase(XAPIAN_DB);
}
// Build subqueries from $extra array. Now only used by tags search filter on search widget
$subqueries = array();
foreach ($extra as $subquery) {
if (!empty($subquery)) {
$subqueries[] = new XapianQuery($subquery);
}
}
$query = NULL;
$enquire = new XapianEnquire($db);
if (!empty($query_string)) {
$query_parser = new XapianQueryParser();
//TODO: choose stemmer
$stemmer = new XapianStem("english");
$query_parser->set_stemmer($stemmer);
$query_parser->set_database($db);
$query_parser->set_stemming_strategy(XapianQueryParser::STEM_SOME);
$query_parser->add_boolean_prefix('courseid', XAPIAN_PREFIX_COURSEID);
$query_parser->add_boolean_prefix('toolid', XAPIAN_PREFIX_TOOLID);
$query = $query_parser->parse_query($query_string);
$final_array = array_merge($subqueries, array($query));
$query = new XapianQuery(XapianQuery::OP_AND, $final_array);
} else {
$query = new XapianQuery(XapianQuery::OP_OR, $subqueries);
}
$enquire->set_query($query);
$matches = $enquire->get_mset((int) $start, (int) $length);
$specific_fields = get_specific_field_list();
$results = array();
$i = $matches->begin();
// Display the results.
//echo $matches->get_matches_estimated().'results found';
$count = 0;
while (!$i->equals($matches->end())) {
$count++;
$document = $i->get_document();
if (is_object($document)) {
// process one item terms
$courseid_terms = xapian_get_doc_terms($document, XAPIAN_PREFIX_COURSEID);
$results[$count]['courseid'] = substr($courseid_terms[0]['name'], 1);
$toolid_terms = xapian_get_doc_terms($document, XAPIAN_PREFIX_TOOLID);
$results[$count]['toolid'] = substr($toolid_terms[0]['name'], 1);
// process each specific field prefix
foreach ($specific_fields as $specific_field) {
$results[$count]['sf-' . $specific_field['code']] = xapian_get_doc_terms($document, $specific_field['code']);
}
// rest of data
$results[$count]['xapian_data'] = unserialize($document->get_data());
$results[$count]['score'] = $i->get_percent();
}
$i->next();
}
switch ($count_type) {
case 1:
// Lower bound
$count = $matches->get_matches_lower_bound();
break;
case 2:
// Upper bound
$count = $matches->get_matches_upper_bound();
break;
case 0:
// Best estimate
// Best estimate
default:
$count = $matches->get_matches_estimated();
break;
}
return array($count, $results);
} catch (Exception $e) {
display_xapian_error($e->getMessage());
return NULL;
}
}
function search($query, $num = 20) {
$db = new XapianDatabase(XAPIAN_DIR);
$enquire = new XapianEnquire($db);
$stemmer = new XapianStem("english");
$qp = new XapianQueryParser();
$valuerange = new XapianNumberValueRangeProcessor(0);
$qp->set_stemmer($stemmer);
$qp->set_database($db);
$qp->set_stemming_strategy(XapianQueryParser::STEM_SOME);
$qp->set_default_op(Query_OP_AND);
$qp->add_boolean_prefix('align', 'A');
$qp->add_boolean_prefix('colour', 'C');
$qp->add_boolean_prefix('ep', 'E');
$qp->add_boolean_prefix('noise', 'N');
$qp->add_boolean_prefix('series', 'S');
$qp->add_valuerangeprocessor($valuerange);
$query = $qp->parse_query($query, XapianQueryParser::FLAG_BOOLEAN | XapianQueryParser::FLAG_PHRASE |
XapianQueryParser::FLAG_LOVEHATE | XapianQueryParser::FLAG_WILDCARD |
XapianQueryParser::FLAG_SPELLING_CORRECTION);
$enquire->set_query($query);
$enquire->set_sort_by_value(1, true);
$matches = $enquire->get_mset(0, $num);
$desc = $query->get_description();
$estimate = $matches->get_matches_estimated();
$out = array();
$iter = $matches->begin();
while (!$iter->equals($matches->end())) {
$doc = $iter->get_document();
$data = array('text' => $doc->get_data());
$rank = $iter->get_rank() + 1;
$termiter = $doc->termlist_begin();
$terms = array();
while (!$termiter->equals($doc->termlist_end())) {
$term = $termiter->get_term();
$prefix = substr($term, 0, 1);
if ($prefix == 'A') {
$data['align'] = substr($term, 1);
} elseif ($prefix == 'B') {
$data['begin'] = substr($term, 1);
} elseif ($prefix == 'C') {
$data['colour'] = substr($term, 1);
} elseif ($prefix == 'E') {
$data['ep'] = substr($term, 1);
} elseif ($prefix == 'N') {
$data['noise'] = substr($term, 1);
} elseif ($prefix == 'I') {
$data['pos'] = $term;
} elseif ($prefix == 'S') {
$data['series'] = substr($term, 1);
} else {
$data['terms'][] = $term;
}
$termiter->next();
}
$out[] = $data;
$iter->next();
}
$db = null;
return array(
'query' => $desc,
'estimate' => $estimate,
'data' => $out,
);
}
