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我想在將上傳的圖片插入數據庫之前將其大小縮小到合適的大小。在插入之前觸發處理ORDImage
在Apex中，我創建了一個允許用戶上傳文件的簡單表單，並設置了以下觸發器。
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;
這編譯正常，但當我嘗試並上傳產生以下錯誤的圖像：
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'
我要去哪裏錯了？
我還想創建另一個縮略圖放在同一張表中。