* PostgreSQL search engine
*
* Copyright © 2006-2007 Greg Sabino Mullane <greg@turnstep.com>
- * http://www.mediawiki.org/
+ * https://www.mediawiki.org/
*
* 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
* Search engine hook base class for Postgres
* @ingroup Search
*/
-class SearchPostgres extends SearchEngine {
- /**
- * Creates an instance of this class
- * @param $db DatabaseSqlite: database object
- */
- function __construct( $db ) {
- parent::__construct( $db );
- }
-
+class SearchPostgres extends SearchDatabase {
/**
* Perform a full text search query via tsearch2 and return a result set.
* Currently searches a page's current title (page.page_title) and
* latest revision article text (pagecontent.old_text)
*
- * @param $term String: raw search term
- * @return PostgresSearchResultSet
+ * @param string $term Raw search term
+ * @return SqlSearchResultSet
*/
function searchTitle( $term ) {
- $q = $this->searchQuery( $term , 'titlevector', 'page_title' );
- $olderror = error_reporting(E_ERROR);
- $resultSet = $this->db->resultObject( $this->db->query( $q, 'SearchPostgres', true ) );
- error_reporting($olderror);
- if (!$resultSet) {
- // Needed for "Query requires full scan, GIN doesn't support it"
- return new SearchResultTooMany();
- }
- return new PostgresSearchResultSet( $resultSet, $this->searchTerms );
+ $q = $this->searchQuery( $term, 'titlevector', 'page_title' );
+ $olderror = error_reporting( E_ERROR );
+ $resultSet = $this->db->query( $q, 'SearchPostgres', true );
+ error_reporting( $olderror );
+ return new SqlSearchResultSet( $resultSet, $this->searchTerms );
}
+
function searchText( $term ) {
$q = $this->searchQuery( $term, 'textvector', 'old_text' );
- $olderror = error_reporting(E_ERROR);
- $resultSet = $this->db->resultObject( $this->db->query( $q, 'SearchPostgres', true ) );
- error_reporting($olderror);
- if (!$resultSet) {
- return new SearchResultTooMany();
- }
- return new PostgresSearchResultSet( $resultSet, $this->searchTerms );
+ $olderror = error_reporting( E_ERROR );
+ $resultSet = $this->db->query( $q, 'SearchPostgres', true );
+ error_reporting( $olderror );
+ return new SqlSearchResultSet( $resultSet, $this->searchTerms );
}
-
- /*
+ /**
* Transform the user's search string into a better form for tsearch2
* Returns an SQL fragment consisting of quoted text to search for.
- */
+ *
+ * @param string $term
+ *
+ * @return string
+ */
function parseQuery( $term ) {
-
wfDebug( "parseQuery received: $term \n" );
- ## No backslashes allowed
- $term = preg_replace('/\\\/', '', $term);
+ # # No backslashes allowed
+ $term = preg_replace( '/\\\/', '', $term );
- ## Collapse parens into nearby words:
- $term = preg_replace('/\s*\(\s*/', ' (', $term);
- $term = preg_replace('/\s*\)\s*/', ') ', $term);
+ # # Collapse parens into nearby words:
+ $term = preg_replace( '/\s*\(\s*/', ' (', $term );
+ $term = preg_replace( '/\s*\)\s*/', ') ', $term );
- ## Treat colons as word separators:
- $term = preg_replace('/:/', ' ', $term);
+ # # Treat colons as word separators:
+ $term = preg_replace( '/:/', ' ', $term );
$searchstring = '';
- $m = array();
- if( preg_match_all('/([-!]?)(\S+)\s*/', $term, $m, PREG_SET_ORDER ) ) {
- foreach( $m as $terms ) {
- if (strlen($terms[1])) {
+ $m = [];
+ if ( preg_match_all( '/([-!]?)(\S+)\s*/', $term, $m, PREG_SET_ORDER ) ) {
+ foreach ( $m as $terms ) {
+ if ( strlen( $terms[1] ) ) {
$searchstring .= ' & !';
}
- if (strtolower($terms[2]) === 'and') {
+ if ( strtolower( $terms[2] ) === 'and' ) {
$searchstring .= ' & ';
- }
- else if (strtolower($terms[2]) === 'or' or $terms[2] === '|') {
+ } elseif ( strtolower( $terms[2] ) === 'or' || $terms[2] === '|' ) {
$searchstring .= ' | ';
- }
- else if (strtolower($terms[2]) === 'not') {
+ } elseif ( strtolower( $terms[2] ) === 'not' ) {
$searchstring .= ' & !';
- }
- else {
+ } else {
$searchstring .= " & $terms[2]";
}
}
}
- ## Strip out leading junk
- $searchstring = preg_replace('/^[\s\&\|]+/', '', $searchstring);
+ # # Strip out leading junk
+ $searchstring = preg_replace( '/^[\s\&\|]+/', '', $searchstring );
- ## Remove any doubled-up operators
- $searchstring = preg_replace('/([\!\&\|]) +(?:[\&\|] +)+/', "$1 ", $searchstring);
+ # # Remove any doubled-up operators
+ $searchstring = preg_replace( '/([\!\&\|]) +(?:[\&\|] +)+/', "$1 ", $searchstring );
- ## Remove any non-spaced operators (e.g. "Zounds!")
- $searchstring = preg_replace('/([^ ])[\!\&\|]/', "$1", $searchstring);
+ # # Remove any non-spaced operators (e.g. "Zounds!")
+ $searchstring = preg_replace( '/([^ ])[\!\&\|]/', "$1", $searchstring );
- ## Remove any trailing whitespace or operators
- $searchstring = preg_replace('/[\s\!\&\|]+$/', '', $searchstring);
+ # # Remove any trailing whitespace or operators
+ $searchstring = preg_replace( '/[\s\!\&\|]+$/', '', $searchstring );
- ## Remove unnecessary quotes around everything
- $searchstring = preg_replace('/^[\'"](.*)[\'"]$/', "$1", $searchstring);
+ # # Remove unnecessary quotes around everything
+ $searchstring = preg_replace( '/^[\'"](.*)[\'"]$/', "$1", $searchstring );
- ## Quote the whole thing
- $searchstring = $this->db->addQuotes($searchstring);
+ # # Quote the whole thing
+ $searchstring = $this->db->addQuotes( $searchstring );
wfDebug( "parseQuery returned: $searchstring \n" );
return $searchstring;
-
}
/**
* Construct the full SQL query to do the search.
- * @param $term String
- * @param $fulltext String
- * @param $colname
+ * @param string $term
+ * @param string $fulltext
+ * @param string $colname
+ * @return string
*/
function searchQuery( $term, $fulltext, $colname ) {
- $postgresVersion = $this->db->getServerVersion();
-
- $prefix = $postgresVersion < 8.3 ? "'default'," : '';
-
# Get the SQL fragment for the given term
$searchstring = $this->parseQuery( $term );
- ## We need a separate query here so gin does not complain about empty searches
- $SQL = "SELECT to_tsquery($prefix $searchstring)";
- $res = $this->db->query($SQL);
- if (!$res) {
- ## TODO: Better output (example to catch: one 'two)
- die ("Sorry, that was not a valid search string. Please go back and try again");
+ # # We need a separate query here so gin does not complain about empty searches
+ $sql = "SELECT to_tsquery($searchstring)";
+ $res = $this->db->query( $sql );
+ if ( !$res ) {
+ # # TODO: Better output (example to catch: one 'two)
+ die( "Sorry, that was not a valid search string. Please go back and try again" );
}
- $top = pg_fetch_result($res,0,0);
+ $top = $res->fetchRow()[0];
- if ($top === "") { ## e.g. if only stopwords are used XXX return something better
- $query = "SELECT page_id, page_namespace, page_title, 0 AS score ".
+ $this->searchTerms = [];
+ if ( $top === "" ) { # # e.g. if only stopwords are used XXX return something better
+ $query = "SELECT page_id, page_namespace, page_title, 0 AS score " .
"FROM page p, revision r, pagecontent c WHERE p.page_latest = r.rev_id " .
"AND r.rev_text_id = c.old_id AND 1=0";
- }
- else {
- $m = array();
- if( preg_match_all("/'([^']+)'/", $top, $m, PREG_SET_ORDER ) ) {
- foreach( $m as $terms ) {
+ } else {
+ $m = [];
+ if ( preg_match_all( "/'([^']+)'/", $top, $m, PREG_SET_ORDER ) ) {
+ foreach ( $m as $terms ) {
$this->searchTerms[$terms[1]] = $terms[1];
}
}
- $rankscore = $postgresVersion > 8.2 ? 5 : 1;
- $rank = $postgresVersion < 8.3 ? 'rank' : 'ts_rank';
- $query = "SELECT page_id, page_namespace, page_title, ".
- "$rank($fulltext, to_tsquery($prefix $searchstring), $rankscore) AS score ".
- "FROM page p, revision r, pagecontent c WHERE p.page_latest = r.rev_id " .
- "AND r.rev_text_id = c.old_id AND $fulltext @@ to_tsquery($prefix $searchstring)";
+ $query = "SELECT page_id, page_namespace, page_title, " .
+ "ts_rank($fulltext, to_tsquery($searchstring), 5) AS score " .
+ "FROM page p, revision r, pagecontent c WHERE p.page_latest = r.rev_id " .
+ "AND r.rev_text_id = c.old_id AND $fulltext @@ to_tsquery($searchstring)";
}
- ## Redirects
- if (! $this->showRedirects)
- $query .= ' AND page_is_redirect = 0';
-
- ## Namespaces - defaults to 0
- if( !is_null($this->namespaces) ){ // null -> search all
- if ( count($this->namespaces) < 1)
+ # # Namespaces - defaults to 0
+ if ( !is_null( $this->namespaces ) ) { // null -> search all
+ if ( count( $this->namespaces ) < 1 ) {
$query .= ' AND page_namespace = 0';
- else {
+ } else {
$namespaces = $this->db->makeList( $this->namespaces );
$query .= " AND page_namespace IN ($namespaces)";
}
return $query;
}
- ## Most of the work of these two functions are done automatically via triggers
+ # # Most of the work of these two functions are done automatically via triggers
function update( $pageid, $title, $text ) {
- ## We don't want to index older revisions
- $SQL = "UPDATE pagecontent SET textvector = NULL WHERE old_id IN ".
- "(SELECT rev_text_id FROM revision WHERE rev_page = " . intval( $pageid ) .
+ # # We don't want to index older revisions
+ $sql = "UPDATE pagecontent SET textvector = NULL WHERE textvector IS NOT NULL and old_id IN " .
+ "(SELECT DISTINCT rev_text_id FROM revision WHERE rev_page = " . intval( $pageid ) .
" ORDER BY rev_text_id DESC OFFSET 1)";
- $this->db->query($SQL);
+ $this->db->query( $sql );
return true;
}
return true;
}
-} ## end of the SearchPostgres class
-
-/**
- * @ingroup Search
- */
-class PostgresSearchResult extends SearchResult {
- function __construct( $row ) {
- parent::__construct($row);
- $this->score = $row->score;
- }
- function getScore() {
- return $this->score;
- }
-}
-
-/**
- * @ingroup Search
- */
-class PostgresSearchResultSet extends SqlSearchResultSet {
- function __construct( $resultSet, $terms ) {
- parent::__construct( $resultSet, $terms );
- }
-
- function next() {
- $row = $this->mResultSet->fetchObject();
- if( $row === false ) {
- return false;
- } else {
- return new PostgresSearchResult( $row );
- }
- }
}
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