RE: newbieish exception/multilevel transactions

Savepoints will be implemented after WAL.

Vadim

I was wondering, is it a possibility/projected to have nested
transactions in postgres? Would MVCC support that?

What I would like is following:
begin tran a;
do some work;
begin tran b;
do some other work
rollback b;
<at this point, only changes by transaction b are rolled back>
...
commit a;

Alternatively, is there a way to trap an exception in
plpgsql? [I would assume that depends on SPI ability to trap

exceptions...]