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Diffstat (limited to 'includes/SearchMySQL.php')
| -rw-r--r-- | includes/SearchMySQL.php | 206 |
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 ); + } + } +} + +?> |