Oracle Cursor的使用

DECLARE  v_key_ty VARCHAR2(20) := 'COND_OFFER_MSG';  outinfo  Order_types.Order_info_tp;  v_row    master_cd%ROWTYPE;  CURSOR test_cur IS    select * from master_cd where key_ty = 'LAR_BD_MAP';BEGIN  OPEN test_cur;  loop    FETCH test_cur      into v_row;    EXIT WHEN test_cur%NOTFOUND;    dbms_output.put_line(v_row.cd);  end loop;END;