Question

我有两个游标，for循环应根据状态使用游标。

CURSOR order_hist1 IS 
   SELECT id, ordernum, address FROM order_hist; 

CURSOR order_hist2 IS 
   SELECT id, ordernum, address FROM order_hist_complete;

所以for循环应该使用游标order_hist2是变量status =＆＃39; COMPLETE＆＃39; 否则使用order_hist1

 FOR aDistinctLine in --     LOOP
   -- 300 lines code in this loop
 END LOOP;

我不想使用REF游标

Answer 1

您可以使用隐式for循环：

对于您的情况，看起来适合使用UNION（UNION ALL，如果您需要处理重复项或性能原因）将两个游标更改为单个游标，如下所示：

FOR aDistinctLine in (
  -- first cursor: status <> COMPLETE
  SELECT id, ordernum, address FROM order_hist 
   WHERE status <> 'COMPLETE' 
  UNION 
  SELECT id, ordernum, address FROM order_hist_complete 
   WHERE status = 'COMPLETE' 
) LOOP

-- do things with 
--     aDistinctLine.id, 
--     aDistinctLine.ordernum, 
--     aDistinctLine.address 

END LOOP;

然后最好让status看起来像一个局部变量，例如称之为l_status;我不得不说服自己可以在隐式for循环中使用plsql变量...猜我今天学到了什么！

declare
  l_status varchar2(8) := 'COMPLETE';
begin
  for x in (select 'realy?' val from dual where l_status = 'COMPLETE')
  loop
    dbms_output.put_line(x.val);
  end loop;

  l_status := 'graby';
  for x in (select 'here: not complete' val from dual where l_status <> 'COMPLETE')
  loop
    dbms_output.put_line(x.val);
  end loop;
end;
/

pl sql cursor for循环

1 个答案: