includes/SearchOracle.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 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  18 # http://www.gnu.org/copyleft/gpl.html
  19
  20 /**
  21  * @file
  22  * @ingroup Search
  23  */
  24
  25 /**
  26  * Search engine hook base class for Oracle (ConText).
  27  * @ingroup Search
  28  */
  29 class SearchOracle extends SearchEngine {
  30         function __construct($db) {
  31                 $this->db = $db;
  32         }
  33
  34         /**
  35          * Perform a full text search query and return a result set.
  36          *
  37          * @param string $term - Raw search term
  38          * @return OracleSearchResultSet
  39          * @access public
  40          */
  41         function searchText( $term ) {
  42                 $resultSet = $this->db->resultObject($this->db->query($this->getQuery($this->filter($term), true)));
  43                 return new OracleSearchResultSet($resultSet, $this->searchTerms);
  44         }
  45
  46         /**
  47          * Perform a title-only search query and return a result set.
  48          *
  49          * @param string $term - Raw search term
  50          * @return ORacleSearchResultSet
  51          * @access public
  52          */
  53         function searchTitle($term) {
  54                 $resultSet = $this->db->resultObject($this->db->query($this->getQuery($this->filter($term), false)));
  55                 return new MySQLSearchResultSet($resultSet, $this->searchTerms);
  56         }
  57
  58
  59         /**
  60          * Return a partial WHERE clause to exclude redirects, if so set
  61          * @return string
  62          * @private
  63          */
  64         function queryRedirect() {
  65                 if ($this->showRedirects) {
  66                         return '';
  67                 } else {
  68                         return 'AND page_is_redirect=0';
  69                 }
  70         }
  71
  72         /**
  73          * Return a partial WHERE clause to limit the search to the given namespaces
  74          * @return string
  75          * @private
  76          */
  77         function queryNamespaces() {
  78                 if( is_null($this->namespaces) )
  79                         return '';
  80                 if ( !count( $this->namespaces ) ) {
  81                         $namespaces = '0';
  82                 } else {
  83                         $namespaces = $this->db->makeList( $this->namespaces );
  84                 }
  85                 return 'AND page_namespace IN (' . $namespaces . ')';
  86         }
  87
  88         /**
  89          * Return a LIMIT clause to limit results on the query.
  90          * @return string
  91          * @private
  92          */
  93         function queryLimit($sql) {
  94                 return $this->db->limitResult($sql, $this->limit, $this->offset);
  95         }
  96
  97         /**
  98          * Does not do anything for generic search engine
  99          * subclasses may define this though
 100          * @return string
 101          * @private
 102          */
 103         function queryRanking($filteredTerm, $fulltext) {
 104                 return ' ORDER BY score(1)';
 105         }
 106
 107         /**
 108          * Construct the full SQL query to do the search.
 109          * The guts shoulds be constructed in queryMain()
 110          * @param string $filteredTerm
 111          * @param bool $fulltext
 112          * @private
 113          */
 114         function getQuery( $filteredTerm, $fulltext ) {
 115                 return $this->queryLimit($this->queryMain($filteredTerm, $fulltext) . ' ' .
 116                         $this->queryRedirect() . ' ' .
 117                         $this->queryNamespaces() . ' ' .
 118                         $this->queryRanking( $filteredTerm, $fulltext ) . ' ');
 119         }
 120
 121
 122         /**
 123          * Picks which field to index on, depending on what type of query.
 124          * @param bool $fulltext
 125          * @return string
 126          */
 127         function getIndexField($fulltext) {
 128                 return $fulltext ? 'si_text' : 'si_title';
 129         }
 130
 131         /**
 132          * Get the base part of the search query.
 133          *
 134          * @param string $filteredTerm
 135          * @param bool $fulltext
 136          * @return string
 137          * @private
 138          */
 139         function queryMain( $filteredTerm, $fulltext ) {
 140                 $match = $this->parseQuery($filteredTerm, $fulltext);
 141                 $page        = $this->db->tableName('page');
 142                 $searchindex = $this->db->tableName('searchindex');
 143                 return 'SELECT page_id, page_namespace, page_title ' .
 144                         "FROM $page,$searchindex " .
 145                         'WHERE page_id=si_page AND ' . $match;
 146         }
 147
 148         /**
 149          * Parse a user input search string, and return an SQL fragment to be used
 150          * as part of a WHERE clause
 151          */
 152         function parseQuery($filteredText, $fulltext) {
 153                 global $wgContLang;
 154                 $lc = SearchEngine::legalSearchChars();
 155                 $this->searchTerms = array();
 156
 157                 # FIXME: This doesn't handle parenthetical expressions.
 158                 $m = array();
 159                 $q = array();
 160
 161                 if (preg_match_all('/([-+<>~]?)(([' . $lc . ']+)(\*?)|"[^"]*")/',
 162                           $filteredText, $m, PREG_SET_ORDER)) {
 163                         foreach($m as $terms) {
 164                                 $q[] = $terms[1] . $wgContLang->stripForSearch($terms[2]);
 165
 166                                 if (!empty($terms[3])) {
 167                                         $regexp = preg_quote( $terms[3], '/' );
 168                                         if ($terms[4])
 169                                                 $regexp .= "[0-9A-Za-z_]+";
 170                                 } else {
 171                                         $regexp = preg_quote(str_replace('"', '', $terms[2]), '/');
 172                                 }
 173                                 $this->searchTerms[] = $regexp;
 174                         }
 175                 }
 176
 177                 $searchon = $this->db->addQuotes(join(',', $q));
 178                 $field = $this->getIndexField($fulltext);
 179                 return " CONTAINS($field, $searchon, 1) > 0 ";
 180         }
 181
 182         /**
 183          * Create or update the search index record for the given page.
 184          * Title and text should be pre-processed.
 185          *
 186          * @param int $id
 187          * @param string $title
 188          * @param string $text
 189          */
 190         function update($id, $title, $text) {
 191                 $dbw = wfGetDB(DB_MASTER);
 192                 $dbw->replace('searchindex',
 193                         array('si_page'),
 194                         array(
 195                                 'si_page' => $id,
 196                                 'si_title' => $title,
 197                                 'si_text' => $text
 198                         ), 'SearchOracle::update' );
 199                 $dbw->query("CALL ctx_ddl.sync_index('si_text_idx')");
 200                 $dbw->query("CALL ctx_ddl.sync_index('si_title_idx')");
 201         }
 202
 203         /**
 204          * Update a search index record's title only.
 205          * Title should be pre-processed.
 206          *
 207          * @param int $id
 208          * @param string $title
 209          */
 210         function updateTitle($id, $title) {
 211                 $dbw = wfGetDB(DB_MASTER);
 212
 213                 $dbw->update('searchindex',
 214                         array('si_title' => $title),
 215                         array('si_page'  => $id),
 216                         'SearchOracle::updateTitle',
 217                         array());
 218         }
 219 }
 220
 221 /**
 222  * @ingroup Search
 223  */
 224 class OracleSearchResultSet extends SearchResultSet {
 225         function __construct($resultSet, $terms) {
 226                 $this->mResultSet = $resultSet;
 227                 $this->mTerms = $terms;
 228         }
 229
 230         function termMatches() {
 231                 return $this->mTerms;
 232         }
 233
 234         function numRows() {
 235                 return $this->mResultSet->numRows();
 236         }
 237
 238         function next() {
 239                 $row = $this->mResultSet->fetchObject();
 240                 if ($row === false)
 241                         return false;
 242                 return new SearchResult($row);
 243         }
 244 }