Classe « Table »

Méthode sqlalchemy.Table.append_constraint

Signature de la méthode append_constraint

def append_constraint(self, constraint) 

Description

append_constraint.__doc__

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.