Обсуждение: transaction in function

Hi,

I want to write a function that updates several tables; if there is an
exception while updating, it should rollback the transaction and raise an
error.

How can this be done in pgPLSQL in PostgreSQL 8.1 ?

Thank you for helping me out on this one !

am  Tue, dem 05.12.2006, um 16:25:31 +0100 mailte Marian POPESCU folgendes:
> Hi,
> 
> I want to write a function that updates several tables; if there is an
> exception while updating, it should rollback the transaction and raise an
> error.
> 
> How can this be done in pgPLSQL in PostgreSQL 8.1 ?

A function runs within a transaction. You can trapp errors within a
function, read this:

http://www.postgresql.org/docs/8.1/interactive/plpgsql-control-structures.html#PLPGSQL-ERROR-TRAPPING


Andreas
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Marian POPESCU <softexpert@libertysurf.fr> writes:
> I want to write a function that updates several tables; if there is an
> exception while updating, it should rollback the transaction and raise an
> error.

> How can this be done in pgPLSQL in PostgreSQL 8.1 ?

You just do it.  You would have to work at it to *not* have that behavior.
        regards, tom lane

Any function runs into a single transaction so you don't need to worry  
about rolling back on exceptions - this is the standard behavior. If there  
is an exception while running any statement   inside the function it's  
rolls back automatically.


On Tue, 05 Dec 2006 17:25:31 +0200, Marian POPESCU  
<softexpert@libertysurf.fr> wrote:

> Hi,
>
> I want to write a function that updates several tables; if there is an
> exception while updating, it should rollback the transaction and raise an
> error.
>
> How can this be done in pgPLSQL in PostgreSQL 8.1 ?
>
> Thank you for helping me out on this one !
>
>
>
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