docs: def execute(self, statements, exc=IntegrityError, rasie_as=ValueError):
          """Execute ``statements`` in a session, and perform a rollback on
          error. ``exc`` is a single exception object or a tuple of
          objects to be used in the except clause. The error message is
          re-raised as the exception specified by ``raise_as``.
  
          """
  
          Session = sessionmaker(bind=self.engine)
          session = Session()
  
          try:
              for statement in statements:
                  session.execute(statement)
          except exc as err:
              session.rollback()
              raise rasie_as(str(err))
          else:
              session.commit()
          finally:
              session.close()