summaryrefslogtreecommitdiff
path: root/includes/SearchMySQL.php
diff options
context:
space:
mode:
Diffstat (limited to 'includes/SearchMySQL.php')
-rw-r--r--includes/SearchMySQL.php206
1 files changed, 206 insertions, 0 deletions
diff --git a/includes/SearchMySQL.php b/includes/SearchMySQL.php
new file mode 100644
index 00000000..15515952
--- /dev/null
+++ b/includes/SearchMySQL.php
@@ -0,0 +1,206 @@
+<?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
+
+/**
+ * Search engine hook base class for MySQL.
+ * Specific bits for MySQL 3 and 4 variants are in child classes.
+ * @package MediaWiki
+ * @subpackage Search
+ */
+
+/** @package MediaWiki */
+class SearchMySQL extends SearchEngine {
+ /**
+ * Perform a full text search query and return a result set.
+ *
+ * @param string $term - Raw search term
+ * @return MySQLSearchResultSet
+ * @access public
+ */
+ function searchText( $term ) {
+ $resultSet = $this->db->resultObject( $this->db->query( $this->getQuery( $this->filter( $term ), true ) ) );
+ return new MySQLSearchResultSet( $resultSet, $this->searchTerms );
+ }
+
+ /**
+ * Perform a title-only search query and return a result set.
+ *
+ * @param string $term - Raw search term
+ * @return MySQLSearchResultSet
+ * @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() {
+ $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() {
+ return $this->db->limitResult( '', $this->limit, $this->offset );
+ }
+
+ /**
+ * Does not do anything for generic search engine
+ * subclasses may define this though
+ * @return string
+ * @private
+ */
+ function queryRanking( $filteredTerm, $fulltext ) {
+ 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->queryMain( $filteredTerm, $fulltext ) . ' ' .
+ $this->queryRedirect() . ' ' .
+ $this->queryNamespaces() . ' ' .
+ $this->queryRanking( $filteredTerm, $fulltext ) . ' ' .
+ $this->queryLimit();
+ }
+
+
+ /**
+ * 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.
+ * The actual match syntax will depend on the server
+ * version; MySQL 3 and MySQL 4 have different capabilities
+ * in their fulltext search indexes.
+ *
+ * @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;
+ }
+
+ /**
+ * 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
+ ), 'SearchMySQL4::update' );
+ }
+
+ /**
+ * 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 ),
+ 'SearchMySQL4::updateTitle',
+ array( $dbw->lowPriorityOption() ) );
+ }
+}
+
+/** @package MediaWiki */
+class MySQLSearchResultSet extends SearchResultSet {
+ function MySQLSearchResultSet( $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;
+ } else {
+ return new SearchResult( $row );
+ }
+ }
+}
+
+?>