Implemented changes made in r14320 in the Oracle backend. Thanks Russell for...

    def _savepoint_commit(self, sid):

        pass

    def _commit(self):

        if self.connection is not None:

            try:

                return self.connection.commit()

            except Database.IntegrityError, e:

                # In case cx_Oracle implements (now or in a future version)

                # raising this specific exception

                raise utils.IntegrityError, utils.IntegrityError(*tuple(e)), sys.exc_info()[2]

            except Database.DatabaseError, e:

                # cx_Oracle 5.0.4 raises a cx_Oracle.DatabaseError exception

                # with the following attributes and values:

                #  code = 2091

                #  message = 'ORA-02091: transaction rolled back

                #            'ORA-02291: integrity constraint (TEST_DJANGOTEST.SYS

                #               _C00102056) violated - parent key not found'

                # We convert that particular case to our IntegrityError exception

                x = e.args[0]

                if hasattr(x, 'code') and hasattr(x, 'message') \

                   and x.code == 2091 and 'ORA-02291' in x.message:

                    raise utils.IntegrityError, utils.IntegrityError(*tuple(e)), sys.exc_info()[2]

                raise utils.DatabaseError, utils.DatabaseError(*tuple(e)), sys.exc_info()[2]

class OracleParam(object):

    """