/phase3/includes/search/SearchMssql.php
PHP | 252 lines | 110 code | 27 blank | 115 comment | 9 complexity | ea012530823e9f9dc8dc81fdc5afac94 MD5 | raw file
- <?php
- /**
- * Mssql search engine
- *
- * 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 Mssql (ConText).
- * @ingroup Search
- */
- class SearchMssql extends SearchEngine {
- /**
- * Creates an instance of this class
- * @param $db DatabaseMssql: database object
- */
- function __construct( $db ) {
- parent::__construct( $db );
- }
- /**
- * Perform a full text search query and return a result set.
- *
- * @param $term String: raw search term
- * @return MssqlSearchResultSet
- * @access public
- */
- function searchText( $term ) {
- $resultSet = $this->db->resultObject( $this->db->query( $this->getQuery( $this->filter( $term ), true ) ) );
- return new MssqlSearchResultSet( $resultSet, $this->searchTerms );
- }
- /**
- * Perform a title-only search query and return a result set.
- *
- * @param $term String: raw search term
- * @return MssqlSearchResultSet
- * @access public
- */
- function searchTitle( $term ) {
- $resultSet = $this->db->resultObject( $this->db->query( $this->getQuery( $this->filter( $term ), false ) ) );
- return new MssqlSearchResultSet( $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.
- *
- * @param $sql string
- *
- * @return String
- */
- 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
- */
- function queryRanking( $filteredTerm, $fulltext ) {
- return ' ORDER BY ftindex.[RANK] DESC'; // return ' ORDER BY score(1)';
- }
- /**
- * Construct the full SQL query to do the search.
- * The guts shoulds be constructed in queryMain()
- *
- * @param $filteredTerm String
- * @param $fulltext Boolean
- */
- 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 $fulltext Boolean
- * @return string
- */
- function getIndexField( $fulltext ) {
- return $fulltext ? 'si_text' : 'si_title';
- }
- /**
- * Get the base part of the search query.
- *
- * @param $filteredTerm String
- * @param $fulltext Boolean
- * @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, ftindex.[RANK]' .
- "FROM $page,FREETEXTTABLE($searchindex , $match, LANGUAGE 'English') as ftindex " .
- 'WHERE page_id=ftindex.[KEY] ';
- }
- /** @todo document */
- function parseQuery( $filteredText, $fulltext ) {
- global $wgContLang;
- $lc = SearchEngine::legalSearchChars();
- $this->searchTerms = array();
- # @todo 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->normalizeForSearch( $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( $fulltext );
- return "$field, '$searchon'";
- }
- /**
- * Create or update the search index record for the given page.
- * Title and text should be pre-processed.
- *
- * @param $id Integer
- * @param $title String
- * @param $text String
- */
- function update( $id, $title, $text ) {
- // We store the column data as UTF-8 byte order marked binary stream
- // because we are invoking the plain text IFilter on it so that, and we want it
- // to properly decode the stream as UTF-8. SQL doesn't support UTF8 as a data type
- // but the indexer will correctly handle it by this method. Since all we are doing
- // is passing this data to the indexer and never retrieving it via PHP, this will save space
- $table = $this->db->tableName( 'searchindex' );
- $utf8bom = '0xEFBBBF';
- $si_title = $utf8bom . bin2hex( $title );
- $si_text = $utf8bom . bin2hex( $text );
- $sql = "DELETE FROM $table WHERE si_page = $id;";
- $sql .= "INSERT INTO $table (si_page, si_title, si_text) VALUES ($id, $si_title, $si_text)";
- return $this->db->query( $sql, 'SearchMssql::update' );
- }
- /**
- * Update a search index record's title only.
- * Title should be pre-processed.
- *
- * @param $id Integer
- * @param $title String
- */
- function updateTitle( $id, $title ) {
- $table = $this->db->tableName( 'searchindex' );
- // see update for why we are using the utf8bom
- $utf8bom = '0xEFBBBF';
- $si_title = $utf8bom . bin2hex( $title );
- $sql = "DELETE FROM $table WHERE si_page = $id;";
- $sql .= "INSERT INTO $table (si_page, si_title, si_text) VALUES ($id, $si_title, 0x00)";
- return $this->db->query( $sql, 'SearchMssql::updateTitle' );
- }
- }
- /**
- * @ingroup Search
- */
- class MssqlSearchResultSet 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 );
- }
- }