On Sat, Jul 03, 2004 at 11:03:33AM -0400, Tom Lane wrote:
> than begin/commit for subxacts? What about savepoints?) Also, what about
> exposing this functionality in plpgsql? Seems like we need some kind of
> exception handling syntax to make this useful. What does Oracle do?
Oracle uses savepoints:
SAVEPOINT savepointname;
creates a savepoint or shifts existing savepoint of the same name;
ROLLBACK TO savepointname;
rolls back to savepoint (more verbose syntax also available);
The syntax of handling exceptions is (in PL/SQL):
BEGIN some code, for example a bunch of SQL commands;EXCEPTION WHEN nameofexception THEN handle the
exception,maybe ROLLBACK;END;
There are predefined exceptions like INVALID_NUMBER, NO_DATA_FOUND,
ZERO_DIVIDE, or OTHERS.
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