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<?php
/**
* IBM DB2 search engine
*
* Copyright © 2004 Brion Vibber <brion@pobox.com>
* http://www.mediawiki.org/
*
* 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 Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup Search
*/
/**
* Search engine hook base class for IBM DB2
* @ingroup Search
*/
class SearchIBM_DB2 extends SearchEngine {
/**
* Creates an instance of this class
* @param $db DatabaseIbm_db2: database object
*/
function __construct($db) {
parent::__construct( $db );
}
/**
* Perform a full text search query and return a result set.
*
* @param $term String: raw search term
* @return SqlSearchResultSet
*/
function searchText( $term ) {
$resultSet = $this->db->resultObject($this->db->query($this->getQuery($this->filter($term), true)));
return new SqlSearchResultSet($resultSet, $this->searchTerms);
}
/**
* Perform a title-only search query and return a result set.
*
* @param $term String: taw search term
* @return SqlSearchResultSet
*/
function searchTitle($term) {
$resultSet = $this->db->resultObject($this->db->query($this->getQuery($this->filter($term), false)));
return new SqlSearchResultSet($resultSet, $this->searchTerms);
}
/**
* Return a partial WHERE clause to exclude redirects, if so set
* @return String
*/
function queryRedirect() {
if ($this->showRedirects) {
return '';
} else {
return 'AND page_is_redirect=0';
}
}
/**
* Return a partial WHERE clause to limit the search to the given namespaces
* @return String
*/
function queryNamespaces() {
if( is_null($this->namespaces) )
return '';
$namespaces = implode(',', $this->namespaces);
if ($namespaces == '') {
$namespaces = '0';
}
return 'AND page_namespace IN (' . $namespaces . ')';
}
/**
* Return a LIMIT clause to limit results on the query.
* @return String
*/
function queryLimit( $sql ) {
return $this->db->limitResult($sql, $this->limit, $this->offset);
}
/**
* Does not do anything for generic search engine
* subclasses may define this though
* @return String
*/
function queryRanking($filteredTerm, $fulltext) {
// requires Net Search Extender or equivalent
// return ' ORDER BY score(1)';
return '';
}
/**
* Construct the full SQL query to do the search.
* The guts shoulds be constructed in queryMain()
* @param $filteredTerm String
* @param $fulltext Boolean
*/
function getQuery( $filteredTerm, $fulltext ) {
return $this->queryLimit($this->queryMain($filteredTerm, $fulltext) . ' ' .
$this->queryRedirect() . ' ' .
$this->queryNamespaces() . ' ' .
$this->queryRanking( $filteredTerm, $fulltext ) . ' ');
}
/**
* Picks which field to index on, depending on what type of query.
* @param $fulltext Boolean
* @return String
*/
function getIndexField($fulltext) {
return $fulltext ? 'si_text' : 'si_title';
}
/**
* Get the base part of the search query.
*
* @param $filteredTerm String
* @param $fulltext Boolean
* @return String
*/
function queryMain( $filteredTerm, $fulltext ) {
$match = $this->parseQuery($filteredTerm, $fulltext);
$page = $this->db->tableName('page');
$searchindex = $this->db->tableName('searchindex');
return 'SELECT page_id, page_namespace, page_title ' .
"FROM $page,$searchindex " .
'WHERE page_id=si_page AND ' . $match;
}
/** @todo document */
function parseQuery($filteredText, $fulltext) {
global $wgContLang;
$lc = SearchEngine::legalSearchChars();
$this->searchTerms = array();
# @todo FIXME: This doesn't handle parenthetical expressions.
$m = array();
$q = array();
if (preg_match_all('/([-+<>~]?)(([' . $lc . ']+)(\*?)|"[^"]*")/',
$filteredText, $m, PREG_SET_ORDER)) {
foreach($m as $terms) {
// Search terms in all variant forms, only
// apply on wiki with LanguageConverter
$temp_terms = $wgContLang->autoConvertToAllVariants( $terms[2] );
if( is_array( $temp_terms )) {
$temp_terms = array_unique( array_values( $temp_terms ));
foreach( $temp_terms as $t )
$q[] = $terms[1] . $wgContLang->normalizeForSearch( $t );
}
else
$q[] = $terms[1] . $wgContLang->normalizeForSearch( $terms[2] );
if (!empty($terms[3])) {
$regexp = preg_quote( $terms[3], '/' );
if ($terms[4])
$regexp .= "[0-9A-Za-z_]+";
} else {
$regexp = preg_quote(str_replace('"', '', $terms[2]), '/');
}
$this->searchTerms[] = $regexp;
}
}
$searchon = $this->db->strencode(join(',', $q));
$field = $this->getIndexField($fulltext);
// requires Net Search Extender or equivalent
//return " CONTAINS($field, '$searchon') > 0 ";
return " lcase($field) LIKE lcase('%$searchon%')";
}
/**
* Create or update the search index record for the given page.
* Title and text should be pre-processed.
*
* @param $id Integer
* @param $title String
* @param $text String
*/
function update($id, $title, $text) {
$dbw = wfGetDB(DB_MASTER);
$dbw->replace('searchindex',
array('si_page'),
array(
'si_page' => $id,
'si_title' => $title,
'si_text' => $text
), 'SearchIBM_DB2::update' );
// ?
//$dbw->query("CALL ctx_ddl.sync_index('si_text_idx')");
//$dbw->query("CALL ctx_ddl.sync_index('si_title_idx')");
}
/**
* Update a search index record's title only.
* Title should be pre-processed.
*
* @param $id Integer
* @param $title String
*/
function updateTitle($id, $title) {
$dbw = wfGetDB(DB_MASTER);
$dbw->update('searchindex',
array('si_title' => $title),
array('si_page' => $id),
'SearchIBM_DB2::updateTitle',
array());
}
}