PHP RecentChange::selectFields方法代码示例

 /**
  * Process the query
  *
  * @param array $conds
  * @param FormOptions $opts
  * @return bool|ResultWrapper Result or false
  */
 public function doMainQuery($conds, $opts)
 {
     $tables = ['recentchanges'];
     $fields = RecentChange::selectFields();
     $query_options = [];
     $join_conds = [];
     ChangeTags::modifyDisplayQuery($tables, $fields, $conds, $join_conds, $query_options, '');
     if (!$this->runMainQueryHook($tables, $fields, $conds, $query_options, $join_conds, $opts)) {
         return false;
     }
     $dbr = $this->getDB();
     return $dbr->select($tables, $fields, $conds, __METHOD__, $query_options, $join_conds);
 }

 /**
  * Process the query
  *
  * @param array $conds
  * @param FormOptions $opts
  * @return bool|ResultWrapper Result or false (for Recentchangeslinked only)
  */
 public function doMainQuery($conds, $opts)
 {
     $dbr = $this->getDB();
     $user = $this->getUser();
     # Toggle watchlist content (all recent edits or just the latest)
     if ($opts['extended']) {
         $limitWatchlist = $user->getIntOption('wllimit');
         $usePage = false;
     } else {
         # Top log Ids for a page are not stored
         $nonRevisionTypes = array(RC_LOG);
         Hooks::run('SpecialWatchlistGetNonRevisionTypes', array(&$nonRevisionTypes));
         if ($nonRevisionTypes) {
             $conds[] = $dbr->makeList(array('rc_this_oldid=page_latest', 'rc_type' => $nonRevisionTypes), LIST_OR);
         }
         $limitWatchlist = 0;
         $usePage = true;
     }
     $tables = array('recentchanges', 'watchlist');
     $fields = RecentChange::selectFields();
     $query_options = array('ORDER BY' => 'rc_timestamp DESC');
     $join_conds = array('watchlist' => array('INNER JOIN', array('wl_user' => $user->getId(), 'wl_namespace=rc_namespace', 'wl_title=rc_title')));
     if ($this->getConfig()->get('ShowUpdatedMarker')) {
         $fields[] = 'wl_notificationtimestamp';
     }
     if ($limitWatchlist) {
         $query_options['LIMIT'] = $limitWatchlist;
     }
     $rollbacker = $user->isAllowed('rollback');
     if ($usePage || $rollbacker) {
         $tables[] = 'page';
         $join_conds['page'] = array('LEFT JOIN', 'rc_cur_id=page_id');
         if ($rollbacker) {
             $fields[] = 'page_latest';
         }
     }
     // Log entries with DELETED_ACTION must not show up unless the user has
     // the necessary rights.
     if (!$user->isAllowed('deletedhistory')) {
         $bitmask = LogPage::DELETED_ACTION;
     } elseif (!$user->isAllowedAny('suppressrevision', 'viewsuppressed')) {
         $bitmask = LogPage::DELETED_ACTION | LogPage::DELETED_RESTRICTED;
     } else {
         $bitmask = 0;
     }
     if ($bitmask) {
         $conds[] = $dbr->makeList(array('rc_type != ' . RC_LOG, $dbr->bitAnd('rc_deleted', $bitmask) . " != {$bitmask}"), LIST_OR);
     }
     ChangeTags::modifyDisplayQuery($tables, $fields, $conds, $join_conds, $query_options, '');
     $this->runMainQueryHook($tables, $fields, $conds, $query_options, $join_conds, $opts);
     return $dbr->select($tables, $fields, $conds, __METHOD__, $query_options, $join_conds);
 }

 /**
  * Process the query
  *
  * @param array $conds
  * @param FormOptions $opts
  * @return bool|ResultWrapper Result or false (for Recentchangeslinked only)
  */
 public function doMainQuery($conds, $opts)
 {
     $tables = array('recentchanges');
     $join_conds = array();
     $query_options = array('USE INDEX' => array('recentchanges' => 'rc_timestamp'));
     $uid = $this->getUser()->getId();
     $dbr = wfGetDB(DB_SLAVE);
     $limit = $opts['limit'];
     $namespace = $opts['namespace'];
     $invert = $opts['invert'];
     $associated = $opts['associated'];
     $fields = RecentChange::selectFields();
     // JOIN on watchlist for users
     if ($uid) {
         $tables[] = 'watchlist';
         $fields[] = 'wl_user';
         $fields[] = 'wl_notificationtimestamp';
         $join_conds['watchlist'] = array('LEFT JOIN', array('wl_user' => $uid, 'wl_title=rc_title', 'wl_namespace=rc_namespace'));
     }
     if ($this->getUser()->isAllowed('rollback')) {
         $tables[] = 'page';
         $fields[] = 'page_latest';
         $join_conds['page'] = array('LEFT JOIN', 'rc_cur_id=page_id');
     }
     // Tag stuff.
     ChangeTags::modifyDisplayQuery($tables, $fields, $conds, $join_conds, $query_options, $opts['tagfilter']);
     if (!wfRunHooks('SpecialRecentChangesQuery', array(&$conds, &$tables, &$join_conds, $opts, &$query_options, &$fields))) {
         return false;
     }
     // Don't use the new_namespace_time timestamp index if:
     // (a) "All namespaces" selected
     // (b) We want pages in more than one namespace (inverted/associated)
     // (c) There is a tag to filter on (use tag index instead)
     // (d) UNION + sort/limit is not an option for the DBMS
     if ($namespace === '' || ($invert || $associated) || $opts['tagfilter'] != '' || !$dbr->unionSupportsOrderAndLimit()) {
         $res = $dbr->select($tables, $fields, $conds, __METHOD__, array('ORDER BY' => 'rc_timestamp DESC', 'LIMIT' => $limit) + $query_options, $join_conds);
     } else {
         // We have a new_namespace_time index! UNION over new=(0,1) and sort result set!
         // New pages
         $sqlNew = $dbr->selectSQLText($tables, $fields, array('rc_new' => 1) + $conds, __METHOD__, array('ORDER BY' => 'rc_timestamp DESC', 'LIMIT' => $limit, 'USE INDEX' => array('recentchanges' => 'new_name_timestamp')), $join_conds);
         // Old pages
         $sqlOld = $dbr->selectSQLText($tables, $fields, array('rc_new' => 0) + $conds, __METHOD__, array('ORDER BY' => 'rc_timestamp DESC', 'LIMIT' => $limit, 'USE INDEX' => array('recentchanges' => 'new_name_timestamp')), $join_conds);
         # Join the two fast queries, and sort the result set
         $sql = $dbr->unionQueries(array($sqlNew, $sqlOld), false) . ' ORDER BY rc_timestamp DESC';
         $sql = $dbr->limitResult($sql, $limit, false);
         $res = $dbr->query($sql, __METHOD__);
     }
     return $res;
 }

 /**
  * Process the query
  *
  * @param array $conds
  * @param FormOptions $opts
  * @return bool|ResultWrapper Result or false (for Recentchangeslinked only)
  */
 public function doMainQuery($conds, $opts)
 {
     $dbr = $this->getDB();
     $user = $this->getUser();
     $tables = array('recentchanges');
     $fields = RecentChange::selectFields();
     $query_options = array();
     $join_conds = array();
     // JOIN on watchlist for users
     if ($user->getId() && $user->isAllowed('viewmywatchlist')) {
         $tables[] = 'watchlist';
         $fields[] = 'wl_user';
         $fields[] = 'wl_notificationtimestamp';
         $join_conds['watchlist'] = array('LEFT JOIN', array('wl_user' => $user->getId(), 'wl_title=rc_title', 'wl_namespace=rc_namespace'));
     }
     if ($user->isAllowed('rollback')) {
         $tables[] = 'page';
         $fields[] = 'page_latest';
         $join_conds['page'] = array('LEFT JOIN', 'rc_cur_id=page_id');
     }
     ChangeTags::modifyDisplayQuery($tables, $fields, $conds, $join_conds, $query_options, $opts['tagfilter']);
     if (!$this->runMainQueryHook($tables, $fields, $conds, $query_options, $join_conds, $opts)) {
         return false;
     }
     // array_merge() is used intentionally here so that hooks can, should
     // they so desire, override the ORDER BY / LIMIT condition(s); prior to
     // MediaWiki 1.26 this used to use the plus operator instead, which meant
     // that extensions weren't able to change these conditions
     $query_options = array_merge(array('ORDER BY' => 'rc_timestamp DESC', 'LIMIT' => $opts['limit']), $query_options);
     $rows = $dbr->select($tables, $fields, $conds + array('rc_new' => array(0, 1)), __METHOD__, $query_options, $join_conds);
     // Build the final data
     if ($this->getConfig()->get('AllowCategorizedRecentChanges')) {
         $this->filterByCategories($rows, $opts);
     }
     return $rows;
 }

 /**
  * Process the query
  *
  * @param array $conds
  * @param FormOptions $opts
  * @return bool|ResultWrapper Result or false (for Recentchangeslinked only)
  */
 public function doMainQuery($conds, $opts)
 {
     global $wgAllowCategorizedRecentChanges;
     $dbr = $this->getDB();
     $user = $this->getUser();
     $tables = array('recentchanges');
     $fields = RecentChange::selectFields();
     $query_options = array();
     $join_conds = array();
     // JOIN on watchlist for users
     if ($user->getId() && $user->isAllowed('viewmywatchlist')) {
         $tables[] = 'watchlist';
         $fields[] = 'wl_user';
         $fields[] = 'wl_notificationtimestamp';
         $join_conds['watchlist'] = array('LEFT JOIN', array('wl_user' => $user->getId(), 'wl_title=rc_title', 'wl_namespace=rc_namespace'));
     }
     if ($user->isAllowed('rollback')) {
         $tables[] = 'page';
         $fields[] = 'page_latest';
         $join_conds['page'] = array('LEFT JOIN', 'rc_cur_id=page_id');
     }
     ChangeTags::modifyDisplayQuery($tables, $fields, $conds, $join_conds, $query_options, $opts['tagfilter']);
     if (!wfRunHooks('SpecialRecentChangesQuery', array(&$conds, &$tables, &$join_conds, $opts, &$query_options, &$fields), '1.23')) {
         return false;
     }
     // rc_new is not an ENUM, but adding a redundant rc_new IN (0,1) gives mysql enough
     // knowledge to use an index merge if it wants (it may use some other index though).
     $rows = $dbr->select($tables, $fields, $conds + array('rc_new' => array(0, 1)), __METHOD__, array('ORDER BY' => 'rc_timestamp DESC', 'LIMIT' => $opts['limit']) + $query_options, $join_conds);
     // Build the final data
     if ($wgAllowCategorizedRecentChanges) {
         $this->filterByCategories($rows, $opts);
     }
     return $rows;
 }

 public function doMainQuery($conds, $opts)
 {
     $target = $opts['target'];
     $showlinkedto = $opts['showlinkedto'];
     $limit = $opts['limit'];
     if ($target === '') {
         return false;
     }
     $outputPage = $this->getOutput();
     $title = Title::newFromURL($target);
     if (!$title || $title->isExternal()) {
         $outputPage->addHtml('<div class="errorbox">' . $this->msg('allpagesbadtitle')->parse() . '</div>');
         return false;
     }
     $outputPage->setPageTitle($this->msg('recentchangeslinked-title', $title->getPrefixedText()));
     /*
      * Ordinary links are in the pagelinks table, while transclusions are
      * in the templatelinks table, categorizations in categorylinks and
      * image use in imagelinks.  We need to somehow combine all these.
      * Special:Whatlinkshere does this by firing multiple queries and
      * merging the results, but the code we inherit from our parent class
      * expects only one result set so we use UNION instead.
      */
     $dbr = wfGetDB(DB_SLAVE, 'recentchangeslinked');
     $id = $title->getArticleID();
     $ns = $title->getNamespace();
     $dbkey = $title->getDBkey();
     $tables = array('recentchanges');
     $select = RecentChange::selectFields();
     $join_conds = array();
     $query_options = array();
     // left join with watchlist table to highlight watched rows
     $uid = $this->getUser()->getId();
     if ($uid && $this->getUser()->isAllowed('viewmywatchlist')) {
         $tables[] = 'watchlist';
         $select[] = 'wl_user';
         $join_conds['watchlist'] = array('LEFT JOIN', array('wl_user' => $uid, 'wl_title=rc_title', 'wl_namespace=rc_namespace'));
     }
     if ($this->getUser()->isAllowed('rollback')) {
         $tables[] = 'page';
         $join_conds['page'] = array('LEFT JOIN', 'rc_cur_id=page_id');
         $select[] = 'page_latest';
     }
     ChangeTags::modifyDisplayQuery($tables, $select, $conds, $join_conds, $query_options, $opts['tagfilter']);
     if (!wfRunHooks('SpecialRecentChangesQuery', array(&$conds, &$tables, &$join_conds, $opts, &$query_options, &$select), '1.23')) {
         return false;
     }
     if ($ns == NS_CATEGORY && !$showlinkedto) {
         // special handling for categories
         // XXX: should try to make this less kludgy
         $link_tables = array('categorylinks');
         $showlinkedto = true;
     } else {
         // for now, always join on these tables; really should be configurable as in whatlinkshere
         $link_tables = array('pagelinks', 'templatelinks');
         // imagelinks only contains links to pages in NS_FILE
         if ($ns == NS_FILE || !$showlinkedto) {
             $link_tables[] = 'imagelinks';
         }
     }
     if ($id == 0 && !$showlinkedto) {
         return false;
         // nonexistent pages can't link to any pages
     }
     // field name prefixes for all the various tables we might want to join with
     $prefix = array('pagelinks' => 'pl', 'templatelinks' => 'tl', 'categorylinks' => 'cl', 'imagelinks' => 'il');
     $subsql = array();
     // SELECT statements to combine with UNION
     foreach ($link_tables as $link_table) {
         $pfx = $prefix[$link_table];
         // imagelinks and categorylinks tables have no xx_namespace field,
         // and have xx_to instead of xx_title
         if ($link_table == 'imagelinks') {
             $link_ns = NS_FILE;
         } elseif ($link_table == 'categorylinks') {
             $link_ns = NS_CATEGORY;
         } else {
             $link_ns = 0;
         }
         if ($showlinkedto) {
             // find changes to pages linking to this page
             if ($link_ns) {
                 if ($ns != $link_ns) {
                     continue;
                 }
                 // should never happen, but check anyway
                 $subconds = array("{$pfx}_to" => $dbkey);
             } else {
                 $subconds = array("{$pfx}_namespace" => $ns, "{$pfx}_title" => $dbkey);
             }
             $subjoin = "rc_cur_id = {$pfx}_from";
         } else {
             // find changes to pages linked from this page
             $subconds = array("{$pfx}_from" => $id);
             if ($link_table == 'imagelinks' || $link_table == 'categorylinks') {
                 $subconds["rc_namespace"] = $link_ns;
                 $subjoin = "rc_title = {$pfx}_to";
             } else {
                 $subjoin = array("rc_namespace = {$pfx}_namespace", "rc_title = {$pfx}_title");
             }
//.........这里部分代码省略.........

//.........这里部分代码省略.........
		$form .= $this->msg( 'watchlist-details' )->numParams( $nitems )->parse() . "\n";
		if ( $wgEnotifWatchlist && $user->getOption( 'enotifwatchlistpages' ) ) {
			$form .= $this->msg( 'wlheader-enotif' )->parse() . "\n";
		}
		if ( $wgShowUpdatedMarker ) {
			$form .= $this->msg( 'wlheader-showupdated' )->parse() . "\n";
		}
		$form .= "</p>";

		if ( $wgShowUpdatedMarker ) {
			$form .= Xml::openElement( 'form', array( 'method' => 'post',
				'action' => $this->getTitle()->getLocalURL(),
				'id' => 'mw-watchlist-resetbutton' ) ) . "\n" .
			Xml::submitButton( $this->msg( 'enotif_reset' )->text(), array( 'name' => 'dummy' ) ) . "\n" .
			Html::hidden( 'reset', 'all' ) . "\n";
			foreach ( $nondefaults as $key => $value ) {
				$form .= Html::hidden( $key, $value ) . "\n";
			}
			$form .= Xml::closeElement( 'form' ) . "\n";
		}

		$form .= Xml::openElement( 'form', array(
			'method' => 'post',
			'action' => $this->getTitle()->getLocalURL(),
			'id' => 'mw-watchlist-form'
		) );
		$form .= Xml::fieldset(
			$this->msg( 'watchlist-options' )->text(),
			false,
			array( 'id' => 'mw-watchlist-options' )
		);

		$tables = array( 'recentchanges', 'watchlist' );
		$fields = RecentChange::selectFields();
		$join_conds = array(
			'watchlist' => array(
				'INNER JOIN',
				array(
					'wl_user' => $user->getId(),
					'wl_namespace=rc_namespace',
					'wl_title=rc_title'
				),
			),
		);
		$options = array( 'ORDER BY' => 'rc_timestamp DESC' );
		if ( $wgShowUpdatedMarker ) {
			$fields[] = 'wl_notificationtimestamp';
		}
		if ( $limitWatchlist ) {
			$options['LIMIT'] = $limitWatchlist;
		}

		$rollbacker = $user->isAllowed( 'rollback' );
		if ( $usePage || $rollbacker ) {
			$tables[] = 'page';
			$join_conds['page'] = array( 'LEFT JOIN', 'rc_cur_id=page_id' );
			if ( $rollbacker ) {
				$fields[] = 'page_latest';
			}
		}

		// Log entries with DELETED_ACTION must not show up unless the user has
		// the necessary rights.
		if ( !$user->isAllowed( 'deletedhistory' ) ) {
			$bitmask = LogPage::DELETED_ACTION;
		} elseif ( !$user->isAllowed( 'suppressrevision' ) ) {

	/**
	 * Process the query
	 *
	 * @param array $conds
	 * @param FormOptions $opts
	 * @return bool|ResultWrapper Result or false (for Recentchangeslinked only)
	 */
	public function doMainQuery( $conds, $opts ) {
		$tables = array( 'recentchanges' );
		$join_conds = array();
		$query_options = array(
			'USE INDEX' => array( 'recentchanges' => 'rc_timestamp' )
		);

		$uid = $this->getUser()->getId();
		$dbr = wfGetDB( DB_SLAVE );
		$limit = $opts['limit'];
		$namespace = $opts['namespace'];
		$invert = $opts['invert'];
		$associated = $opts['associated'];

		$fields = RecentChange::selectFields();
		// JOIN on watchlist for users
		if ( $uid && $this->getUser()->isAllowed( 'viewmywatchlist' ) ) {
			$tables[] = 'watchlist';
			$fields[] = 'wl_user';
			$fields[] = 'wl_notificationtimestamp';
			$join_conds['watchlist'] = array( 'LEFT JOIN', array(
				'wl_user' => $uid,
				'wl_title=rc_title',
				'wl_namespace=rc_namespace'
			) );
		}
		if ( $this->getUser()->isAllowed( 'rollback' ) ) {
			$tables[] = 'page';
			$fields[] = 'page_latest';
			$join_conds['page'] = array( 'LEFT JOIN', 'rc_cur_id=page_id' );
		}
		// Tag stuff.
		ChangeTags::modifyDisplayQuery(
			$tables,
			$fields,
			$conds,
			$join_conds,
			$query_options,
			$opts['tagfilter']
		);

		if ( !wfRunHooks( 'SpecialRecentChangesQuery',
			array( &$conds, &$tables, &$join_conds, $opts, &$query_options, &$fields ) )
		) {
			return false;
		}

		// rc_new is not an ENUM, but adding a redundant rc_new IN (0,1) gives mysql enough
		// knowledge to use an index merge if it wants (it may use some other index though).
		return $dbr->select(
			$tables,
			$fields,
			$conds + array( 'rc_new' => array( 0, 1 ) ),
			__METHOD__,
			array( 'ORDER BY' => 'rc_timestamp DESC', 'LIMIT' => $limit ) + $query_options,
			$join_conds
		);
	}

//.........这里部分代码省略.........
         $conds[] = $nameSpaceClause;
     }
     # Toggle watchlist content (all recent edits or just the latest)
     if ($user->getOption('extendwatchlist')) {
         $limitWatchlist = intval($user->getOption('wllimit'));
         $usePage = false;
     } else {
         # Top log Ids for a page are not stored
         $conds[] = 'rc_this_oldid=page_latest OR rc_type=' . RC_LOG;
         $limitWatchlist = 0;
         $usePage = true;
     }
     # Show a message about slave lag, if applicable
     $lag = wfGetLB()->safeGetLag($dbr);
     if ($lag > 0) {
         $output->showLagWarning($lag);
     }
     # Create output form
     $form = Xml::fieldset($this->msg('watchlist-options')->text(), false, array('id' => 'mw-watchlist-options'));
     # Show watchlist header
     $form .= $this->msg('watchlist-details')->numParams($nitems)->parse();
     if ($user->getOption('enotifwatchlistpages') && $wgEnotifWatchlist) {
         $form .= $this->msg('wlheader-enotif')->parseAsBlock() . "\n";
     }
     if ($wgShowUpdatedMarker) {
         $form .= Xml::openElement('form', array('method' => 'post', 'action' => $this->getTitle()->getLocalUrl(), 'id' => 'mw-watchlist-resetbutton')) . $this->msg('wlheader-showupdated')->parse() . ' ' . Xml::submitButton($this->msg('enotif_reset')->text(), array('name' => 'dummy')) . Html::hidden('reset', 'all');
         foreach ($nondefaults as $key => $value) {
             $form .= Html::hidden($key, $value);
         }
         $form .= Xml::closeElement('form');
     }
     $form .= '<hr />';
     $tables = array('recentchanges', 'watchlist');
     $fields = RecentChange::selectFields();
     $join_conds = array('watchlist' => array('INNER JOIN', array('wl_user' => $user->getId(), 'wl_namespace=rc_namespace', 'wl_title=rc_title')));
     $options = array('ORDER BY' => 'rc_timestamp DESC');
     if ($wgShowUpdatedMarker) {
         $fields[] = 'wl_notificationtimestamp';
     }
     if ($limitWatchlist) {
         $options['LIMIT'] = $limitWatchlist;
     }
     $rollbacker = $user->isAllowed('rollback');
     if ($usePage || $rollbacker) {
         $tables[] = 'page';
         $join_conds['page'] = array('LEFT JOIN', 'rc_cur_id=page_id');
         if ($rollbacker) {
             $fields[] = 'page_latest';
         }
     }
     ChangeTags::modifyDisplayQuery($tables, $fields, $conds, $join_conds, $options, '');
     wfRunHooks('SpecialWatchlistQuery', array(&$conds, &$tables, &$join_conds, &$fields));
     $res = $dbr->select($tables, $fields, $conds, __METHOD__, $options, $join_conds);
     $numRows = $res->numRows();
     /* Start bottom header */
     $lang = $this->getLanguage();
     $wlInfo = '';
     if ($values['days'] > 0) {
         $timestamp = wfTimestampNow();
         $wlInfo = $this->msg('wlnote')->numParams($numRows, round($values['days'] * 24))->params($lang->userDate($timestamp, $user), $lang->userTime($timestamp, $user))->parse() . '<br />';
     }
     $cutofflinks = "\n" . $this->cutoffLinks($values['days'], $nondefaults) . "<br />\n";
     # Spit out some control panel links
     $filters = array('hideMinor' => 'rcshowhideminor', 'hideBots' => 'rcshowhidebots', 'hideAnons' => 'rcshowhideanons', 'hideLiu' => 'rcshowhideliu', 'hideOwn' => 'rcshowhidemine', 'hidePatrolled' => 'rcshowhidepatr');
     foreach ($this->customFilters as $key => $params) {
         $filters[$key] = $params['msg'];

 /**
  * Process the query
  *
  * @param array $conds
  * @param FormOptions $opts
  * @return bool|ResultWrapper Result or false
  */
 public function doMainQuery($conds, $opts)
 {
     $tables = array('recentchanges');
     $fields = RecentChange::selectFields();
     $query_options = array();
     $join_conds = array();
     ChangeTags::modifyDisplayQuery($tables, $fields, $conds, $join_conds, $query_options, '');
     if (!wfRunHooks('ChangesListSpecialPageQuery', array($this->getName(), &$tables, &$fields, &$conds, &$query_options, &$join_conds, $opts))) {
         return false;
     }
     $dbr = $this->getDB();
     return $dbr->select($tables, $fields, $conds, __METHOD__, $query_options, $join_conds);
 }

 /**
  * Process the query
  *
  * @param array $conds
  * @param FormOptions $opts
  * @return bool|ResultWrapper Result or false
  */
 public function doMainQuery($conds, $opts)
 {
     $tables = array('recentchanges');
     $fields = RecentChange::selectFields();
     $query_options = array();
     $join_conds = array();
     ChangeTags::modifyDisplayQuery($tables, $fields, $conds, $join_conds, $query_options, '');
     // @todo Fire a Special{$this->getName()}Query hook here
     // @todo Uncomment and document
     // if ( !wfRunHooks( 'ChangesListSpecialPageQuery',
     // 	array( &$tables, &$fields, &$conds, &$query_options, &$join_conds, $opts ) )
     // ) {
     // 	return false;
     // }
     $dbr = $this->getDB();
     return $dbr->select($tables, $fields, $conds, __METHOD__, $query_options, $join_conds);
 }