+
+ # Get the last title from previous chunk
+ $res_prev = $dbr->select(
+ 'page',
+ 'page_title',
+ array( 'page_namespace' => $namespace, 'page_title < '.$dbr->addQuotes($from) ),
+ $fname,
+ array( 'ORDER BY' => 'page_title DESC', 'LIMIT' => $this->maxPerPage, 'OFFSET' => ($this->maxPerPage - 1 ) )
+ );
+
+ # Get first title of previous complete chunk
+ if( $dbr->numrows( $res_prev ) >= $this->maxPerPage ) {
+ $pt = $dbr->fetchObject( $res_prev );
+ $prevTitle = Title::makeTitle( $namespace, $pt->page_title );
+ } else {
+ # The previous chunk is not complete, need to link to the very first title
+ # available in the database
+ $reallyFirstPage_title = $dbr->selectField( 'page', 'page_title', array( 'page_namespace' => $namespace ), $fname, array( 'LIMIT' => 1) );
+
+ # Show the previous link if it s not the current requested chunk
+ if( $from != $reallyFirstPage_title ) {
+ $prevTitle = Title::makeTitle( $namespace, $reallyFirstPage_title );
+ } else {
+ $prevTitle = null;
+ }
+ }
+