+++ /dev/null
-<?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();
-
- # 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());
- }
-}
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