SearchMssql.php

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<?php
class SearchMssql extends SearchEngine {

    function __construct( $db ) {
        parent::__construct( $db );
    }

    function searchText( $term ) {
        $resultSet = $this->db->resultObject( $this->db->query( $this->getQuery( $this->filter( $term ), true ) ) );
        return new MssqlSearchResultSet( $resultSet, $this->searchTerms );
    }

    function searchTitle( $term ) {
        $resultSet = $this->db->resultObject( $this->db->query( $this->getQuery( $this->filter( $term ), false ) ) );
        return new MssqlSearchResultSet( $resultSet, $this->searchTerms );
    }

    function queryRedirect() {
        if ( $this->showRedirects ) {
            return '';
        } else {
            return 'AND page_is_redirect=0';
        }
    }

    function queryNamespaces() {
        $namespaces = implode( ',', $this->namespaces );
        if ( $namespaces == '' ) {
            $namespaces = '0';
        }
        return 'AND page_namespace IN (' . $namespaces . ')';
    }

    function queryLimit( $sql ) {
        return $this->db->limitResult( $sql, $this->limit, $this->offset );
    }

    function queryRanking( $filteredTerm, $fulltext ) {
        return ' ORDER BY ftindex.[RANK] DESC'; // return ' ORDER BY score(1)';
    }

    function getQuery( $filteredTerm, $fulltext ) {
        return $this->queryLimit( $this->queryMain( $filteredTerm, $fulltext ) . ' ' .
            $this->queryRedirect() . ' ' .
            $this->queryNamespaces() . ' ' .
            $this->queryRanking( $filteredTerm, $fulltext ) . ' ' );
    }

    function getIndexField( $fulltext ) {
        return $fulltext ? 'si_text' : 'si_title';
    }

    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] ';
    }

    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'";
    }

    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' );
    }

    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' );
    }
}

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 );
    }
}