Read ROWID from trigger

Question

Hi expert,
I'm trying to working with a trigger.
I want get the ROWID of the record after the commit
desc tmp_table
Name                           Null     Type                                                                                                                                                                                         
TMPID                            NOT NULL VARCHAR2(10)                                                                                                                                                                                 
FIRST_DAY                               DATE                                                                                                                                                                                         
LAST_DAY                               DATE                                                                                                                                                                                         
NOTE                                    VARCHAR2(255)        
CREATE OR REPLACE TRIGGER trigger_test
BEFORE UPDATE OF FIRST_DAY ON TMP_TABLE
declare
v_tmpid  tmp_table.tmpid%type;
BEGIN
insert into tmp_table values ('111',sysdate,sysdate,'1111');
dbms_output.put_line ('HOW I GET THE ROWID OF THE RECORD UPDATED?');
      commit;
   END;
/the trigger work fine if I update the column first_day, but I don't know how i can get the rowid of this record.
cheers,
Lain

Answer 1

"Printing" the rowid doesn't have much value.
If you want to see what it actually means, use the dbms_rowid package to format it.
SQL> declare
  2     l_rowid         rowid;
  3     l_rowid_type    number;
  4     l_object_number number;
  5     l_relative_fno  number;
  6     l_block_number  number;
  7     l_row_number    number;
  8  begin
  9     select rowid
10     into   l_rowid
11     from   t
12     where  rownum = 1;
13
14     DBMS_ROWID.ROWID_INFO (rowid_in         => l_rowid,
15                            rowid_type       => l_rowid_type,
16                            object_number    => l_object_number,
17                            relative_fno     => l_relative_fno,
18                            block_number     => l_block_number,
19                            row_number       => l_row_number);
20
21     dbms_output.put_line('rowid_type    = ' || l_rowid_type);
22     dbms_output.put_line('object_number = ' || l_object_number);
23     dbms_output.put_line('relative_fno  = ' || l_relative_fno);
24     dbms_output.put_line('block_number  = ' || l_block_number);
25     dbms_output.put_line('row_number    = ' || l_row_number);
26  end;
27  /
rowid_type    = 1
object_number = 1473364
relative_fno  = 42
block_number  = 47334
row_number    = 0