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Map a class declaratively.
In this form of mapping, the class is scanned for mapping information,
including for columns to be associated with a table, and/or an
actual table object.
Returns the :class:`_orm.Mapper` object.
E.g.::
from sqlalchemy.orm import registry
mapper_registry = registry()
class Foo:
__tablename__ = 'some_table'
id = Column(Integer, primary_key=True)
name = Column(String)
mapper = mapper_registry.map_declaratively(Foo)
This function is more conveniently invoked indirectly via either the
:meth:`_orm.registry.mapped` class decorator or by subclassing a
declarative metaclass generated from
:meth:`_orm.registry.generate_base`.
See the section :ref:`orm_declarative_mapping` for complete
details and examples.
:param cls: class to be mapped.
:return: a :class:`_orm.Mapper` object.
.. seealso::
:ref:`orm_declarative_mapping`
:meth:`_orm.registry.mapped` - more common decorator interface
to this function.
:meth:`_orm.registry.map_imperatively`
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