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Logic to map Python classes to and from selectables.

Defines the :class:`~sqlalchemy.orm.mapper.Mapper` class, the central
configurational unit which associates a class with a database table.

This is a semi-private module; the main configurational API of the ORM is
available in :class:`~sqlalchemy.orm.`.

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Define the correlation of class attributes to database table
    columns.

    The :class:`.Mapper` object is instantiated using the
    :func:`~sqlalchemy.orm.mapper` function.    For information
    about instantiating new :class:`.Mapper` objects, see
    that function's documentation.


    When :func:`.mapper` is used
    explicitly to link a user defined class with table
    metadata, this is referred to as *classical mapping*.
    Modern SQLAlchemy usage tends to favor the
    :mod:`sqlalchemy.ext.declarative` extension for class
    configuration, which
    makes usage of :func:`.mapper` behind the scenes.

    Given a particular class known to be mapped by the ORM,
    the :class:`.Mapper` which maintains it can be acquired
    using the :func:`.inspect` function::

        from sqlalchemy import inspect

        mapper = inspect(MyClass)

    A class which was mapped by the :mod:`sqlalchemy.ext.declarative`
    extension will also have its mapper available via the ``__mapper__``
    attribute.


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XdS(s6GReturn a new :class:`~.Mapper` object.

        This function is typically used behind the scenes
        via the Declarative extension.   When using Declarative,
        many of the usual :func:`.mapper` arguments are handled
        by the Declarative extension itself, including ``class_``,
        ``local_table``, ``properties``, and  ``inherits``.
        Other options are passed to :func:`.mapper` using
        the ``__mapper_args__`` class variable::

           class MyClass(Base):
               __tablename__ = 'my_table'
               id = Column(Integer, primary_key=True)
               type = Column(String(50))
               alt = Column("some_alt", Integer)

               __mapper_args__ = {
                   'polymorphic_on' : type
               }


        Explicit use of :func:`.mapper`
        is often referred to as *classical mapping*.  The above
        declarative example is equivalent in classical form to::

            my_table = Table("my_table", metadata,
                Column('id', Integer, primary_key=True),
                Column('type', String(50)),
                Column("some_alt", Integer)
            )

            class MyClass(object):
                pass

            mapper(MyClass, my_table,
                polymorphic_on=my_table.c.type,
                properties={
                    'alt':my_table.c.some_alt
                })

        .. seealso::

            :ref:`classical_mapping` - discussion of direct usage of
            :func:`.mapper`

        :param class\_: The class to be mapped.  When using Declarative,
          this argument is automatically passed as the declared class
          itself.

        :param local_table: The :class:`.Table` or other selectable
           to which the class is mapped.  May be ``None`` if
           this mapper inherits from another mapper using single-table
           inheritance.   When using Declarative, this argument is
           automatically passed by the extension, based on what
           is configured via the ``__table__`` argument or via the
           :class:`.Table` produced as a result of the ``__tablename__``
           and :class:`.Column` arguments present.

        :param always_refresh: If True, all query operations for this mapped
           class will overwrite all data within object instances that already
           exist within the session, erasing any in-memory changes with
           whatever information was loaded from the database. Usage of this
           flag is highly discouraged; as an alternative, see the method
           :meth:`.Query.populate_existing`.

        :param allow_partial_pks: Defaults to True.  Indicates that a
           composite primary key with some NULL values should be considered as
           possibly existing within the database. This affects whether a
           mapper will assign an incoming row to an existing identity, as well
           as if :meth:`.Session.merge` will check the database first for a
           particular primary key value. A "partial primary key" can occur if
           one has mapped to an OUTER JOIN, for example.

        :param batch: Defaults to ``True``, indicating that save operations
           of multiple entities can be batched together for efficiency.
           Setting to False indicates
           that an instance will be fully saved before saving the next
           instance.  This is used in the extremely rare case that a
           :class:`.MapperEvents` listener requires being called
           in between individual row persistence operations.

        :param column_prefix: A string which will be prepended
           to the mapped attribute name when :class:`.Column`
           objects are automatically assigned as attributes to the
           mapped class.  Does not affect explicitly specified
           column-based properties.

           See the section :ref:`column_prefix` for an example.

        :param concrete: If True, indicates this mapper should use concrete
           table inheritance with its parent mapper.

           See the section :ref:`concrete_inheritance` for an example.

        :param confirm_deleted_rows: defaults to True; when a DELETE occurs
          of one more rows based on specific primary keys, a warning is
          emitted when the number of rows matched does not equal the number
          of rows expected.  This parameter may be set to False to handle the
          case where database ON DELETE CASCADE rules may be deleting some of
          those rows automatically.  The warning may be changed to an
          exception in a future release.

          .. versionadded:: 0.9.4 - added
             :paramref:`.mapper.confirm_deleted_rows` as well as conditional
             matched row checking on delete.

        :param eager_defaults: if True, the ORM will immediately fetch the
          value of server-generated default values after an INSERT or UPDATE,
          rather than leaving them as expired to be fetched on next access.
          This can be used for event schemes where the server-generated values
          are needed immediately before the flush completes.   By default,
          this scheme will emit an individual ``SELECT`` statement per row
          inserted or updated, which note can add significant performance
          overhead.  However, if the
          target database supports :term:`RETURNING`, the default values will
          be returned inline with the INSERT or UPDATE statement, which can
          greatly enhance performance for an application that needs frequent
          access to just-generated server defaults.

          .. versionchanged:: 0.9.0 The ``eager_defaults`` option can now
             make use of :term:`RETURNING` for backends which support it.

        :param exclude_properties: A list or set of string column names to
          be excluded from mapping.

          See :ref:`include_exclude_cols` for an example.

        :param extension: A :class:`.MapperExtension` instance or
           list of :class:`.MapperExtension` instances which will be applied
           to all operations by this :class:`.Mapper`.  **Deprecated.**
           Please see :class:`.MapperEvents`.

        :param include_properties: An inclusive list or set of string column
          names to map.

          See :ref:`include_exclude_cols` for an example.

        :param inherits: A mapped class or the corresponding :class:`.Mapper`
          of one indicating a superclass to which this :class:`.Mapper`
          should *inherit* from.   The mapped class here must be a subclass
          of the other mapper's class.   When using Declarative, this argument
          is passed automatically as a result of the natural class
          hierarchy of the declared classes.

          .. seealso::

            :ref:`inheritance_toplevel`

        :param inherit_condition: For joined table inheritance, a SQL
           expression which will
           define how the two tables are joined; defaults to a natural join
           between the two tables.

        :param inherit_foreign_keys: When ``inherit_condition`` is used and
           the columns present are missing a :class:`.ForeignKey`
           configuration, this parameter can be used to specify which columns
           are "foreign".  In most cases can be left as ``None``.

        :param legacy_is_orphan: Boolean, defaults to ``False``.
          When ``True``, specifies that "legacy" orphan consideration
          is to be applied to objects mapped by this mapper, which means
          that a pending (that is, not persistent) object is auto-expunged
          from an owning :class:`.Session` only when it is de-associated
          from *all* parents that specify a ``delete-orphan`` cascade towards
          this mapper.  The new default behavior is that the object is
          auto-expunged when it is de-associated with *any* of its parents
          that specify ``delete-orphan`` cascade.  This behavior is more
          consistent with that of a persistent object, and allows behavior to
          be consistent in more scenarios independently of whether or not an
          orphanable object has been flushed yet or not.

          See the change note and example at :ref:`legacy_is_orphan_addition`
          for more detail on this change.

          .. versionadded:: 0.8 - the consideration of a pending object as
            an "orphan" has been modified to more closely match the
            behavior as that of persistent objects, which is that the object
            is expunged from the :class:`.Session` as soon as it is
            de-associated from any of its orphan-enabled parents.  Previously,
            the pending object would be expunged only if de-associated
            from all of its orphan-enabled parents. The new flag
            ``legacy_is_orphan`` is added to :func:`.orm.mapper` which
            re-establishes the legacy behavior.

        :param non_primary: Specify that this :class:`.Mapper` is in addition
          to the "primary" mapper, that is, the one used for persistence.
          The :class:`.Mapper` created here may be used for ad-hoc
          mapping of the class to an alternate selectable, for loading
          only.

          :paramref:`.Mapper.non_primary` is not an often used option, but
          is useful in some specific :func:`.relationship` cases.

          .. seealso::

              :ref:`relationship_non_primary_mapper`

        :param order_by: A single :class:`.Column` or list of :class:`.Column`
           objects for which selection operations should use as the default
           ordering for entities.  By default mappers have no pre-defined
           ordering.

        :param passive_updates: Indicates UPDATE behavior of foreign key
           columns when a primary key column changes on a joined-table
           inheritance mapping.   Defaults to ``True``.

           When True, it is assumed that ON UPDATE CASCADE is configured on
           the foreign key in the database, and that the database will handle
           propagation of an UPDATE from a source column to dependent columns
           on joined-table rows.

           When False, it is assumed that the database does not enforce
           referential integrity and will not be issuing its own CASCADE
           operation for an update.  The unit of work process will
           emit an UPDATE statement for the dependent columns during a
           primary key change.

           .. seealso::

               :ref:`passive_updates` - description of a similar feature as
               used with :func:`.relationship`

        :param polymorphic_on: Specifies the column, attribute, or
          SQL expression used to determine the target class for an
          incoming row, when inheriting classes are present.

          This value is commonly a :class:`.Column` object that's
          present in the mapped :class:`.Table`::

            class Employee(Base):
                __tablename__ = 'employee'

                id = Column(Integer, primary_key=True)
                discriminator = Column(String(50))

                __mapper_args__ = {
                    "polymorphic_on":discriminator,
                    "polymorphic_identity":"employee"
                }

          It may also be specified
          as a SQL expression, as in this example where we
          use the :func:`.case` construct to provide a conditional
          approach::

            class Employee(Base):
                __tablename__ = 'employee'

                id = Column(Integer, primary_key=True)
                discriminator = Column(String(50))

                __mapper_args__ = {
                    "polymorphic_on":case([
                        (discriminator == "EN", "engineer"),
                        (discriminator == "MA", "manager"),
                    ], else_="employee"),
                    "polymorphic_identity":"employee"
                }

          It may also refer to any attribute
          configured with :func:`.column_property`, or to the
          string name of one::

                class Employee(Base):
                    __tablename__ = 'employee'

                    id = Column(Integer, primary_key=True)
                    discriminator = Column(String(50))
                    employee_type = column_property(
                        case([
                            (discriminator == "EN", "engineer"),
                            (discriminator == "MA", "manager"),
                        ], else_="employee")
                    )

                    __mapper_args__ = {
                        "polymorphic_on":employee_type,
                        "polymorphic_identity":"employee"
                    }

          .. versionchanged:: 0.7.4
              ``polymorphic_on`` may be specified as a SQL expression,
              or refer to any attribute configured with
              :func:`.column_property`, or to the string name of one.

          When setting ``polymorphic_on`` to reference an
          attribute or expression that's not present in the
          locally mapped :class:`.Table`, yet the value
          of the discriminator should be persisted to the database,
          the value of the
          discriminator is not automatically set on new
          instances; this must be handled by the user,
          either through manual means or via event listeners.
          A typical approach to establishing such a listener
          looks like::

                from sqlalchemy import event
                from sqlalchemy.orm import object_mapper

                @event.listens_for(Employee, "init", propagate=True)
                def set_identity(instance, *arg, **kw):
                    mapper = object_mapper(instance)
                    instance.discriminator = mapper.polymorphic_identity

          Where above, we assign the value of ``polymorphic_identity``
          for the mapped class to the ``discriminator`` attribute,
          thus persisting the value to the ``discriminator`` column
          in the database.

          .. warning::

             Currently, **only one discriminator column may be set**, typically
             on the base-most class in the hierarchy. "Cascading" polymorphic
             columns are not yet supported.

          .. seealso::

            :ref:`inheritance_toplevel`

        :param polymorphic_identity: Specifies the value which
          identifies this particular class as returned by the
          column expression referred to by the ``polymorphic_on``
          setting.  As rows are received, the value corresponding
          to the ``polymorphic_on`` column expression is compared
          to this value, indicating which subclass should
          be used for the newly reconstructed object.

        :param properties: A dictionary mapping the string names of object
           attributes to :class:`.MapperProperty` instances, which define the
           persistence behavior of that attribute.  Note that :class:`.Column`
           objects present in
           the mapped :class:`.Table` are automatically placed into
           ``ColumnProperty`` instances upon mapping, unless overridden.
           When using Declarative, this argument is passed automatically,
           based on all those :class:`.MapperProperty` instances declared
           in the declared class body.

        :param primary_key: A list of :class:`.Column` objects which define
           the primary key to be used against this mapper's selectable unit.
           This is normally simply the primary key of the ``local_table``, but
           can be overridden here.

        :param version_id_col: A :class:`.Column`
           that will be used to keep a running version id of rows
           in the table.  This is used to detect concurrent updates or
           the presence of stale data in a flush.  The methodology is to
           detect if an UPDATE statement does not match the last known
           version id, a
           :class:`~sqlalchemy.orm.exc.StaleDataError` exception is
           thrown.
           By default, the column must be of :class:`.Integer` type,
           unless ``version_id_generator`` specifies an alternative version
           generator.

           .. seealso::

              :ref:`mapper_version_counter` - discussion of version counting
              and rationale.

        :param version_id_generator: Define how new version ids should
          be generated.  Defaults to ``None``, which indicates that
          a simple integer counting scheme be employed.  To provide a custom
          versioning scheme, provide a callable function of the form::

              def generate_version(version):
                  return next_version

          Alternatively, server-side versioning functions such as triggers,
          or programmatic versioning schemes outside of the version id
          generator may be used, by specifying the value ``False``.
          Please see :ref:`server_side_version_counter` for a discussion
          of important points when using this option.

          .. versionadded:: 0.9.0 ``version_id_generator`` supports
             server-side version number generation.

          .. seealso::

             :ref:`custom_version_counter`

             :ref:`server_side_version_counter`


        :param with_polymorphic: A tuple in the form ``(<classes>,
            <selectable>)`` indicating the default style of "polymorphic"
            loading, that is, which tables are queried at once. <classes> is
            any single or list of mappers and/or classes indicating the
            inherited classes that should be loaded at once. The special value
            ``'*'`` may be used to indicate all descending classes should be
            loaded immediately. The second tuple argument <selectable>
            indicates a selectable that will be used to query for multiple
            classes.

            .. seealso::

              :ref:`with_polymorphic` - discussion of polymorphic querying
              techniques.

        tclass_c

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