--- /dev/null
+<?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.
+ *
+ * @return String
+ * @private
+ */
+ 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
+ * @private
+ */
+ 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
+ * @private
+ */
+ 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();
+
+ # 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 );
+ }
+}
+
+
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