Method append_constraint

lib/sqlalchemy/sql/schema.py:1250–1269

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.Const

(self, constraint: Union[Index, Constraint])

            ) from de

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

        """

        constraint._set_parent_with_dispatch(self)

    def _set_parent(self, parent: SchemaEventTarget, **kw: Any) -> None:
        metadata = parent