- $sql = "SELECT 'DoubleRedirects' as type," .
- " pa.page_namespace as namespace, pa.page_title as title," .
- " pb.page_namespace as nsb, pb.page_title as tb," .
- " pc.page_namespace as nsc, pc.page_title as tc" .
- " FROM $pagelinks AS la, $pagelinks AS lb, $page AS pa, $page AS pb, $page AS pc" .
- " WHERE pa.page_is_redirect=1 AND pb.page_is_redirect=1" .
- " AND la.pl_from=pa.page_id" .
- " AND la.pl_namespace=pb.page_namespace" .
- " AND la.pl_title=pb.page_title" .
- " AND lb.pl_from=pb.page_id" .
- " AND lb.pl_namespace=pc.page_namespace" .
- " AND lb.pl_title=pc.page_title";
+ $limitToTitle = !( $namespace === null && $title === null );
+ $sql = $limitToTitle ? "SELECT" : "SELECT 'DoubleRedirects' as type," ;
+ $sql .=
+ " pa.page_namespace as namespace, pa.page_title as title," .
+ " pb.page_namespace as nsb, pb.page_title as tb," .
+ " pc.page_namespace as nsc, pc.page_title as tc" .
+ " FROM $pagelinks AS la, $pagelinks AS lb, $page AS pa, $page AS pb, $page AS pc" .
+ " WHERE pa.page_is_redirect=1 AND pb.page_is_redirect=1" .
+ " AND la.pl_from=pa.page_id" .
+ " AND la.pl_namespace=pb.page_namespace" .
+ " AND la.pl_title=pb.page_title" .
+ " AND lb.pl_from=pb.page_id" .
+ " AND lb.pl_namespace=pc.page_namespace" .
+ " AND lb.pl_title=pc.page_title";
+
+ if( $limitToTitle ) {
+ $encTitle = $dbr->addQuotes( $title );
+ $sql .= " AND pa.page_namespace=$namespace" .
+ " AND pa.page_title=$encTitle";
+ }
+