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Classe « Table »

Méthode sqlalchemy.Table.append_constraint

Signature de la méthode append_constraint

def append_constraint(self, constraint: 'Union[Index, Constraint]') -> 'None' 

Description

help(Table.append_constraint)

Append a :class:`_schema.Constraint` to this
:class:`_schema.Table`.

This has the effect of the constraint being included in any
future CREATE TABLE statement, assuming specific DDL creation
events have not been associated with the given
:class:`_schema.Constraint` object.

Note that this does **not** produce the constraint within the
relational database automatically, for a table that already exists
in the database.   To add a constraint to an
existing relational database table, the SQL ALTER command must
be used.  SQLAlchemy also provides the
:class:`.AddConstraint` construct which can produce this SQL when
invoked as an executable clause.

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