public void listarC(){
		
		Query query = new Query("Administracion_roles").addSort("date", Query.SortDirection.DESCENDING);
	    List<Entity> Administracion_roles = datastore.prepare(query).asList(FetchOptions.Builder.withDefaults());
	    if (Administracion_roles.isEmpty()) {
	    	System.out.println("  no Administracion_roles");
	    } 
	    else {
	    	System.out.println("there Administracion_roles and are ....");
	        for (int i=0;i<Administracion_roles.size();i++) {
	        	System.out.println("--->"+Administracion_roles.set(i, A_r).getProperties());
	        }
	    }    
	}