Module « sqlalchemy »

Classe « ColumnDefault »

Informations générales

Héritage

    builtins.object
        Traversible
    builtins.object
        SchemaEventTarget
            SchemaItem
builtins.object
    HasMemoized
        Generative
builtins.object
    SQLRole
        StatementRole
            Executable
                DefaultGenerator
                    ColumnDefault

Définition

class ColumnDefault(DefaultGenerator):

Description _{[extrait de ColumnDefault.doc]}

A plain default value on a column.

    This could correspond to a constant, a callable function,
    or a SQL clause.

    :class:`.ColumnDefault` is generated automatically
    whenever the ``default``, ``onupdate`` arguments of
    :class:`_schema.Column` are used.  A :class:`.ColumnDefault`
    can be passed positionally as well.

    For example, the following::

        Column('foo', Integer, default=50)

    Is equivalent to::

        Column('foo', Integer, ColumnDefault(50))

Constructeur(s)

Signature du constructeur	Description
__init__(self, arg, **kwargs)	Construct a new :class:`.ColumnDefault`. _{[extrait de __init__.__doc__]}

Liste des attributs statiques

Nom de l'attribut	Valeur
allows_lambda	False
column	None
create_drop_stringify_dialect	default
dispatch	<sqlalchemy.event.base.DDLEventsDispatch object at 0x7f40cbc2af40>
info	<sqlalchemy.util.langhelpers.memoized_property object at 0x7f40cbc85d20>
is_callable	<sqlalchemy.util.langhelpers.memoized_property object at 0x7f40cbae8850>
is_clause_element	<sqlalchemy.util.langhelpers.memoized_property object at 0x7f40cbaead40>
is_delete	False
is_dml	False
is_insert	False
is_scalar	<sqlalchemy.util.langhelpers.memoized_property object at 0x7f40cbae8d00>
is_select	False
is_sequence	False
is_server_default	False
is_text	False
is_update	False
supports_execution	True
uses_inspection	False