Update/Insert/Delete into the same table

Question

Hi,
I'm writing pl/sql code :
nvoice_id will be passed as parameter and based on invoice_id I need to see whether any records exist in history table.If not any then insert record into table.If more than one record exist then I need delete all except most recent one based hist_seq column in that table.
Then I need to update that record for description column .How to put dml operation one after another in an efficient manner?As one statement depend on another do I need to use autonomous transaction?
Thanks,
Kiran

Answer 1

user518071 wrote:
Hi,
I'm writing pl/sql code :
nvoice_id will be passed as parameter and based on invoice_id I need to see whether any records exist in history table.If not any then insert record into table.If more than one record exist then I need delete all except most recent one based hist_seq column in that table.
Then I need to update that record for description column .How to put dml operation one after another in an efficient manner?As one statement depend on another do I need to use autonomous transaction?
Thanks,
KiranBasic idea.
create procedure p_deal_with_invoice
   p_invoice_id  number
   l_max_hist_seq number;
is
begin
select max(hist_seq)
into l_max_hist_seq
from your_table
where invoice_id = p_invoice_id;
if l_max_hist_seq is not null
then
   delete from your_table
   where invoice_id = p_invoice_id
   and hist_seq != l_max_hist_seq;
   update your_table set some_columns = some_new_value
   where invoice_id = p_invoice_id
   and hist_seq = l_max_hist_seq;
else
   insert into your_table () values ();
end if;
end p_deal_with_invoice;
/An autonomous transaction would probably be the last thing you'd want here. Just a simple plsql procedure that accepts a INVOICE_ID as an input.
Cheers,
Edited by: Tubby on Jun 18, 2012 2:53 PM