Carica un BLOB da BFILE

Questo è un esempio:

procedure load_attachment(dir in varchar2, nam in varchar2) is
 fl BFILE;
 att blob;
 begin
 Dbms_Lob.createtemporary(att, TRUE, Dbms_Lob.CALL); 
 fl := BFileName(dir, nam);
 if (dbms_lob.fileexists(fl) = 1) then
 
 Dbms_Lob.fileopen(fl, Dbms_Lob.LOB_READONLY);
 Dbms_Lob.loadfromfile(att, fl, Dbms_Lob.getlength(fl));
 Dbms_Lob.fileclose(fl);

 ....
 else
 dbms_output.put_line('File doesn't exists!');
 end if;  
 end;

Se ottenete l' errore Oracle ORA-22275 - invalid LOB locator specified, forse avete dimenticato l' istruzione Dbms_Lob.createtemporary.