Sample of init code , can be checked here

Oracle has not auto ID generation functionality , so you need to provide some custom ID for each insert operations. There are two ways to do such task

• custom ID generation - id generated by PHP code

	function pre_insert($data){
	    	$new_id = time()%10000; //any other ID generation logic can be used here
    		$data->add_field("EMPLOYEE_ID",$new_id);
	}
	$grid->event->attach("beforeInsert","pre_insert");
	$grid->render_table("EMPLOYEES","EMPLOYEE_ID","FIRST_NAME,LAST_NAME");

• use sequence for ID generation

	$grid->sql->sequence("EMPLOYEES_INC.nextVal"); //sequence name
	$grid->render_table("EMPLOYEES","EMPLOYEE_ID","FIRST_NAME,LAST_NAME");