Thanks!
""scott.marlowe"" <scott.marlowe@ihs.com> wrote in message
news:Pine.LNX.4.44.0207191529000.4638-100000@css120.ihs.com...
> On Fri, 19 Jul 2002, Susan Lane wrote:
>
> > I have noticed this difference between Postgres and Oracle as well. I
> > wonder if there is a rollback mechanism as there is in Oracle. I mean
if
> > you use a BEGIN, can you rollback in Postgres?
>
> Yes. If you do the following:
>
> begin;
> select * from table1;
> update table2 set field1='yada' where id=1234;
> delete from table3 where id=1243;
> insert into table4 (fielda, fieldb) values ('hello',45);
> rollback;
>
> Then all the changes (except for sequence counters being incremented) will
> be rolled back.
>
> Note that if you do:
>
> begin;
> select * from ;
> insert into table (name) values('me');
> commit;
>
> The insert will fail because you had a failure in your select query.
> Unlike many other databases where data change failures are the only ones
> to automatically rollback a transaction, in postgresql, almost any error
> in a transaction will cause it to rollback.
>
> Note that postgresql does NOT support nested transactions either.
>
>
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