Feature 1255 : improve sql

Replace in queries LIMIT N,M by LIMIT N OFFSET M

git-svn-id: http://piwigo.org/svn/trunk@4331 68402e56-0260-453c-a942-63ccdbb3a9ee

admin/element_set_unit.php

@@ -196,7 +196,7 @@ SELECT id,path,tn_ext,name,date_creation,comment,author,file
   FROM '.IMAGES_TABLE.'
   WHERE id IN ('.implode(',', $page['cat_elements_id']).')
   '.$conf['order_by'].'
-  LIMIT '.$page['start'].', '.$page['nb_images'].'
+  LIMIT '.$page['start'].' OFFSET '.$page['nb_images'].'
 ;';
   $result = pwg_query($query);