--- /dev/null
+<?php
+# Copyright (C) 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 {
+ function __construct($db) {
+ $this->db = $db;
+ }
+
+ /**
+ * Perform a full text search query and return a result set.
+ *
+ * @param string $term - Raw search term
+ * @return IBM_DB2SearchResultSet
+ * @access public
+ */
+ function searchText( $term ) {
+ $resultSet = $this->db->resultObject($this->db->query($this->getQuery($this->filter($term), true)));
+ return new IBM_DB2SearchResultSet($resultSet, $this->searchTerms);
+ }
+
+ /**
+ * Perform a title-only search query and return a result set.
+ *
+ * @param string $term - Raw search term
+ * @return IBM_DB2SearchResultSet
+ * @access public
+ */
+ function searchTitle($term) {
+ $resultSet = $this->db->resultObject($this->db->query($this->getQuery($this->filter($term), false)));
+ return new MySQLSearchResultSet($resultSet, $this->searchTerms);
+ }
+
+
+ /**
+ * Return a partial WHERE clause to exclude redirects, if so set
+ * @return string
+ * @private
+ */
+ function queryRedirect() {
+ if ($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
+ * @private
+ */
+ function queryNamespaces() {
+ if( is_null($this->namespaces) )
+ return '';
+ $namespaces = implode(',', $this->namespaces);
+ if ($namespaces == '') {
+ $namespaces = '0';
+ }
+ return 'AND page_namespace IN (' . $namespaces . ')';
+ }
+
+ /**
+ * Return a LIMIT clause to limit results on the query.
+ * @return string
+ * @private
+ */
+ function queryLimit($sql) {
+ return $this->db->limitResult($sql, $this->limit, $this->offset);
+ }
+
+ /**
+ * Does not do anything for generic search engine
+ * subclasses may define this though
+ * @return string
+ * @private
+ */
+ function queryRanking($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 string $filteredTerm
+ * @param bool $fulltext
+ * @private
+ */
+ 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 bool $fulltext
+ * @return string
+ */
+ function getIndexField($fulltext) {
+ return $fulltext ? 'si_text' : 'si_title';
+ }
+
+ /**
+ * Get the base part of the search query.
+ *
+ * @param string $filteredTerm
+ * @param bool $fulltext
+ * @return string
+ * @private
+ */
+ 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) {
+ $q[] = $terms[1] . $wgContLang->stripForSearch($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 int $id
+ * @param string $title
+ * @param string $text
+ */
+ function update($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 int $id
+ * @param string $title
+ */
+ function updateTitle($id, $title) {
+ $dbw = wfGetDB(DB_MASTER);
+
+ $dbw->update('searchindex',
+ array('si_title' => $title),
+ array('si_page' => $id),
+ 'SearchIBM_DB2::updateTitle',
+ array());
+ }
+}
+
+/**
+ * @ingroup Search
+ */
+class IBM_DB2SearchResultSet extends SearchResultSet {
+ function __construct($resultSet, $terms) {
+ $this->mResultSet = $resultSet;
+ $this->mTerms = $terms;
+ }
+
+ function termMatches() {
+ return $this->mTerms;
+ }
+
+ function numRows() {
+ return $this->mResultSet->numRows();
+ }
+
+ function next() {
+ $row = $this->mResultSet->fetchObject();
+ if ($row === false)
+ return false;
+ return new SearchResult($row);
+ }
+}
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