Classe « Query »

Méthode sqlalchemy.orm.Query.one

Signature de la méthode one

def one(self) 

Description

one.__doc__

Return exactly one result or raise an exception.

        Raises ``sqlalchemy.orm.exc.NoResultFound`` if the query selects
        no rows.  Raises ``sqlalchemy.orm.exc.MultipleResultsFound``
        if multiple object identities are returned, or if multiple
        rows are returned for a query that returns only scalar values
        as opposed to full identity-mapped entities.

        Calling :meth:`.one` results in an execution of the underlying query.

        .. seealso::

            :meth:`_query.Query.first`

            :meth:`_query.Query.one_or_none`