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我想在将上传的图片插入数据库之前将其大小缩小到合适的大小。在插入之前触发处理ORDImage
在Apex中，我创建了一个允许用户上传文件的简单表单，并设置了以下触发器。
create or replace TRIGGER new_post
BEFORE INSERT
ON posts
FOR EACH ROW
BEGIN
--l_image := ORDSYS.ORDImage.Init();
--SELECT image INTO l_image FROM posts WHERE posts.post_id = :old.post_id FOR UPDATE;
ORDSYS.ORDImage.process(:new.image, 'maxscale=200 200');
:new.user_id := v(':APP_USER');
END;
这编译正常，但当我尝试并上传产生以下错误的图像：
1 error has occurred
ORA-29400: data cartridge error
IMG-00730: unable to process empty image
ORA-06512: at "ORDSYS.ORDIMERRORCODES", line 75
ORA-06512: at "ORDSYS.ORDIMERRORCODES", line 65
ORA-06512: at "ORDSYS.ORDIMERRORCODES", line 29
ORA-06512: at "ORDSYS.ORDIMG_PKG", line 121
ORA-06512: at "ORDSYS.ORDIMAGE", line 1366
ORA-06512: at "MATTHEWLAWS.NEW_POST", line 4
ORA-04088: error during execution of trigger 'MATTHEWLAWS.NEW_POST'
我要去哪里错了？
我还想创建另一个缩略图放在同一张表中。