在Oracle Apex中将Blob列内容从一个表复制到另一个表

Question

I'm currently trying to copy the contents of a blob column from one table to another in Oracle Apex 5 and no matter what, it doesn't copy the BLOB data over, it leaves all those fields blank and it's driving my nuts.

Here is the PL/SQL I'm using to accomplish this as a process.

insert into ATTACHMENTS_AVAIL 
  ("ADDED_FILE", "MIMETYPE", "FILENAME", "CONTRACTOR_ID", "DATE_ADDED", "TYPE") 
select RESUME,
       MIMETYPE,
       FILENAME,
       :P24_CONTRACTOR_ID,
       sysdate,
       'Resume'
from subs 
where pkey = :P24_SUBS_PKEY;

Any idea what I'm missing here?

Here are the field types.

ADDED_FILE    - BLOB
MIMETYPE      - VARCHAR2
FILENAME      - VARCHAR2
CONTRACTOR_ID - NUMBER
DATE_ADDED    - DATE
TYPE          - VARCHAR2

Answer 1

(...) it leaves all those fields blank

It means that WHERE clause failed, completely:

• either there's no SUBS.PKEY whose value is equal to P24_SUBS_PKEY item value, or
• P24_SUBS_PKEY is empty

How come? Because, even if every other value was NULL, SYSDATE (you insert into DATE_ADDED ) and 'Resume' (which goes into TYPE column) would be inserted. So, INSERT failed because SELECT failed because WHERE doesn't work.

I presume you checked whether SUBS table contains appropriate values. Therefore, I presume that P24_SUBS_PKEY item doesn't contain anything. Perhaps you see the value on the screen, but - is it in session state? I guess not. Enable debugging and check the sessions state values after the process ends.

Saying that you wrote a process which should do the INSERT - when does that process "fire"? The simplest way is, probably, when you push a button which submits the page. And, once you submit it, items' values are "stored" into session state. I suggest you to do that, just to make sure it actually works. Then you can improve the whole thing, if necessary.