Classe « Constraint »

Constructeur sqlalchemy.Constraint.__init__

Signature de la constructeur __init__

def __init__(self, name=None, deferrable=None, initially=None, _create_rule=None, info=None, _type_bound=False, **dialect_kw) 

Description

__init__.__doc__

Create a SQL constraint.

        :param name:
          Optional, the in-database name of this ``Constraint``.

        :param deferrable:
          Optional bool.  If set, emit DEFERRABLE or NOT DEFERRABLE when
          issuing DDL for this constraint.

        :param initially:
          Optional string.  If set, emit INITIALLY <value> when issuing DDL
          for this constraint.

        :param info: Optional data dictionary which will be populated into the
            :attr:`.SchemaItem.info` attribute of this object.

            .. versionadded:: 1.0.0

        :param \**dialect_kw:  Additional keyword arguments are dialect
            specific, and passed in the form ``<dialectname>_<argname>``.  See
            the documentation regarding an individual dialect at
            :ref:`dialect_toplevel` for detail on documented arguments.

        :param _create_rule:
          used internally by some datatypes that also create constraints.

        :param _type_bound:
          used internally to indicate that this constraint is associated with
          a specific datatype.