Problem building a trigger using a BLOB field in Oracle 10

Question

My case is the following,
I'm trying to implement an AFTER trigger which uses the :new.blob_field to insert the new value in a table. Because of the documented AFTER restriction and :new use for blob fields, I've though to add other BEFORE trigger that calls a procedure in which I can store the :new value and later insert the temporary value in the table when the AFTER trigger is executed.
The Idea is the following:
BEFORE trigger :new -> TEMP
and then
AFTER trigger uses TEMP to store in the new table
So, the final questions are the following:
-Any other idea to do the same, that is, to use the ":new" value in an AFTER trigger?
-How can I do this with the temp variable, is this correct?:
PROCEDURE store_blob ( new_val BLOB ) IS
BEGIN
DBMS_LOB.CREATETEMPORARY(new_blob_temp,TRUE, DBMS_LOB.SESSION);
-- fill with data
DBMS_LOB.COPY (new_blob_temp,new_val,DBMS_LOB.GETLENGTH(new_val),1,1);
END store_blob ;
Because of the design of the application I have to use the AFTER trigger to store the new value so I must find a solution for this type of fields.
Sorry for the size of the text and also for my english.
Thanks in advance

Answer 1

SQL> create or replace trigger trg1 after insert on test_blob for each row
  2  begin
  3  insert into test_blob2 values (:new.a);
  4  end;
  5  /
Trigger created.
SQL> insert into test_blob values ('123456789');
1 row created.
SQL> desc test_blob;
Name                                      Null?    Type
A                                                  BLOB
SQL> desc test_blob2
Name                                      Null?    Type
A                                                  BLOB
SQL>
SQL> select dbms_lob.getlength(a) from  test_blob2;
DBMS_LOB.GETLENGTH(A)
                    5