Question

我正试图从Oracle表中存储的斑点创建缩略图。我可以使用ordimage.processCopy来处理单个行，但是我想在表中的所有行上运行该过程。

我的理解是，我需要创建一个游标，然后遍历游标以处理每一行。目前，我收到错误消息“ ORA-06510：PL / SQL：未处理的用户定义的异常”，并且我的想法不完整。谁能提供一些见识？

DECLARE
  cursor photos is select PHOTO_ID from placer_photo;
  v_file_content blob;
  v_file_display blob;
  v_thumb blob;
  v_id number;

BEGIN
for i in photos
loop
  SELECT photo_id, file_content, file_display, file_thumbnail INTO v_id, v_file_content, v_file_display, v_thumb FROM placer_photo where photo_id = i.photo_id
  for update;

  /*DBMS_OUTPUT.PUT_LINE(v_id);*/

  ordimage.processCopy(v_file_content, 'maxScale=800 800', v_file_display);
  ordimage.processCopy(v_file_content, 'maxScale=32 32', v_thumb);

  UPDATE placer_photo
  SET file_thumbnail = v_thumb,
  file_display = v_file_display
  where photo_id = i.photo_id;
  COMMIT;
end loop;
END;

编辑：成功了。

DECLARE
  cursor photos is select * from placer_photo where photo_id = 118 for update;
  v_file_content blob;
  v_file_display blob;
  v_thumb blob;
  v_id number;
  v_date date;

BEGIN
for i in photos
loop

  DBMS_OUTPUT.PUT_LINE(i.photo_id);

  v_file_content := i.file_content;
  v_file_display := i.file_display;
  v_thumb := i.file_thumbnail;

  ordimage.processCopy(v_file_content, 'maxScale=800 800', v_file_display);
  ordimage.processCopy(v_file_content, 'maxScale=100 100', v_thumb);

  update placer_photo
  set file_display = v_file_display,
  file_thumbnail = v_thumb
  where current of photos;

end loop;
END;

Answer 1

开始工作。不得不改变一些东西。

  cursor photos is select * from placer_photo for update;
  v_file_content blob;
  v_file_display blob;
  v_thumb blob;
  v_id number;
  v_date date;

BEGIN
for i in photos
loop

  DBMS_OUTPUT.PUT_LINE(i.photo_id);

  v_file_content := i.file_content;
  v_file_display := i.file_display;
  v_thumb := i.file_thumbnail;

  ordimage.processCopy(v_file_content, 'maxScale=800 800', v_file_display);
  ordimage.processCopy(v_file_content, 'maxScale=100 100', v_thumb);

  update placer_photo
  set file_display = v_file_display,
  file_thumbnail = v_thumb
  where current of photos;

end loop;
END;

使用Ordimage.ProcessCopy（）在光标内创建缩略图时出现问题

1 个答案: