Обсуждение: Transaction in plpgsql function?

Hi All,

could someone tell me, how can I start explicitly a transaction in a plpgsql
function? The begin/commit doesn't work.. :-(

Thanks!
MaFa

On Sun, 2003-11-23 at 11:39, MaFa wrote:
> Hi All,
>
> could someone tell me, how can I start explicitly a transaction in a plpgsql
> function? The begin/commit doesn't work.. :-(

You don't.  All of a function takes place inside a transaction.  If
there is no explicit transaction already, an implicit one will have been
started.

--
Oliver Elphick                                Oliver.Elphick@lfix.co.uk
Isle of Wight, UK                             http://www.lfix.co.uk/oliver
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     "The LORD is nigh unto all them that call upon him, to
      all that call upon him in truth."
                                   Psalms 145:18

> You don't.  All of a function takes place inside a transaction.  If
> there is no explicit transaction already, an implicit one will have been
> started.

If it is true, then the following function why causes sometimes a "duplicate
row"' error?

begin
if exists(select session_data from session where session_id= $1 ) then
update session set session_data= $2, session_exp=now() + interval ''10
minutes'' where session_id= $1 ;
return 0;
else
insert into session(session_id, session_exp, session_data) values ($1 ,
now() + interval ''10 minutes'' , $2);
return 1;
end if;
end;

Maybe because of the current isolation level?

Thanks: MaFa