includes/SearchMySQL4.php

   1 <?php
   2 # Copyright (C) 2004 Brion Vibber <brion@pobox.com>
   3 # http://www.mediawiki.org/
   4 #
   5 # This program is free software; you can redistribute it and/or modify
   6 # it under the terms of the GNU General Public License as published by
   7 # the Free Software Foundation; either version 2 of the License, or
   8 # (at your option) any later version.
   9 #
  10 # This program is distributed in the hope that it will be useful,
  11 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  12 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  13 # GNU General Public License for more details.
  14 #
  15 # You should have received a copy of the GNU General Public License along
  16 # with this program; if not, write to the Free Software Foundation, Inc.,
  17 # 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  18 # http://www.gnu.org/copyleft/gpl.html
  19
  20 /**
  21  * Search engine hook for MySQL 4+
  22  * @package MediaWiki
  23  * @subpackage Search
  24  */
  25
  26 require_once( 'SearchEngine.php' );
  27
  28 class SearchMySQL4 extends SearchEngine {
  29         var $strictMatching = false;
  30
  31         function SearchMySQL4( &$db ) {
  32                 $this->db =& $db;
  33         }
  34
  35         function getIndexField( $fulltext ) {
  36                 return $fulltext ? 'si_text' : 'si_title';
  37         }
  38
  39         function parseQuery( $filteredText, $fulltext ) {
  40                 global $wgContLang;
  41                 $lc = SearchEngine::legalSearchChars();
  42                 $searchon = '';
  43                 $this->searchTerms = array();
  44
  45                 # FIXME: This doesn't handle parenthetical expressions.
  46                 if( preg_match_all( '/([-+<>~]?)(([' . $lc . ']+)(\*?)|"[^"]*")/',
  47                           $filteredText, $m, PREG_SET_ORDER ) ) {
  48                         foreach( $m as $terms ) {
  49                                 if( $searchon !== '' ) $searchon .= ' ';
  50                                 if( $this->strictMatching && ($terms[1] == '') ) {
  51                                         $terms[1] = '+';
  52                                 }
  53                                 $searchon .= $terms[1] . $wgContLang->stripForSearch( $terms[2] );
  54                                 if( !empty( $terms[3] ) ) {
  55                                         $regexp = preg_quote( $terms[3], '/' );
  56                                         if( $terms[4] ) $regexp .= "[0-9A-Za-z_]+";
  57                                 } else {
  58                                         $regexp = preg_quote( str_replace( '"', '', $terms[2] ), '/' );
  59                                 }
  60                                 $this->searchTerms[] = $regexp;
  61                         }
  62                         wfDebug( "Would search with '$searchon'\n" );
  63                         wfDebug( "Match with /\b" . implode( '\b|\b', $this->searchTerms ) . "\b/\n" );
  64                 } else {
  65                         wfDebug( "Can't understand search query '{$this->filteredText}'\n" );
  66                 }
  67
  68                 $searchon = $this->db->strencode( $searchon );
  69                 $field = $this->getIndexField( $fulltext );
  70                 return " MATCH($field) AGAINST('$searchon' IN BOOLEAN MODE) ";
  71         }
  72
  73         function queryMain( $filteredTerm, $fulltext ) {
  74                 $match = $this->parseQuery( $filteredTerm, $fulltext );
  75                 $cur = $this->db->tableName( 'cur' );
  76                 $searchindex = $this->db->tableName( 'searchindex' );
  77                 return 'SELECT cur_id, cur_namespace, cur_title, cur_text ' .
  78                         "FROM $cur,$searchindex " .
  79                         'WHERE cur_id=si_page AND ' . $match;
  80         }
  81
  82         function update( $id, $title, $text ) {
  83                 $dbw=& wfGetDB(DB_MASTER);
  84                 $dbw->replace( 'searchindex', array(array('si_page')),
  85                         array(
  86                                 'si_page' => $id,
  87                                 'si_title' => $dbw->strencode($title),
  88                                 'si_text' => $dbw->strencode( $text )
  89                         ), 'SearchMySQL4::update' );
  90         }
  91
  92         function updateTitle($id,$title) {
  93                 $dbw=& wfGetDB(DB_MASTER);
  94                 $lowpri=$dbw->lowPriorityOption();
  95                 $searchindex = $dbw->tableName( 'searchindex' );
  96
  97                 $sql = "UPDATE $lowpri $searchindex SET si_title='" .
  98                           $dbw->strencode( $title ) .
  99                           "' WHERE si_page={$id}";
 100
 101                 $dbw->query( $sql, "SearchMySQL4::updateTitle" );
 102         }
 103
 104 }
 105
 106 ?>