Python orm.mapper方法代碼示例

# 需要導入模塊: from sqlalchemy import orm [as 別名]
# 或者: from sqlalchemy.orm import mapper [as 別名]
def reconstruct_instance(self, mapper, instance):
        """Receive an object instance after it has been created via
        ``__new__``, and after initial attribute population has
        occurred.

        This typically occurs when the instance is created based on
        incoming result rows, and is only called once for that
        instance's lifetime.

        Note that during a result-row load, this method is called upon
        the first row received for this instance.  Note that some
        attributes and collections may or may not be loaded or even
        initialized, depending on what's present in the result rows.

        The return value is only significant within the ``MapperExtension``
        chain; the parent mapper's behavior isn't modified by this method.

        """
        return EXT_CONTINUE 

# 需要導入模塊: from sqlalchemy import orm [as 別名]
# 或者: from sqlalchemy.orm import mapper [as 別名]
def before_insert(self, mapper, connection, instance):
        """Receive an object instance before that instance is inserted
        into its table.

        This is a good place to set up primary key values and such
        that aren't handled otherwise.

        Column-based attributes can be modified within this method
        which will result in the new value being inserted.  However
        *no* changes to the overall flush plan can be made, and
        manipulation of the ``Session`` will not have the desired effect.
        To manipulate the ``Session`` within an extension, use
        ``SessionExtension``.

        The return value is only significant within the ``MapperExtension``
        chain; the parent mapper's behavior isn't modified by this method.

        """

        return EXT_CONTINUE 

# 需要導入模塊: from sqlalchemy import orm [as 別名]
# 或者: from sqlalchemy.orm import mapper [as 別名]
def _accept_with(cls, orm, target):
        if isinstance(target, instrumentation.ClassManager):
            return target
        elif isinstance(target, mapperlib.Mapper):
            return target.class_manager
        elif target is orm.mapper:
            return instrumentation.ClassManager
        elif isinstance(target, type):
            if issubclass(target, mapperlib.Mapper):
                return instrumentation.ClassManager
            else:
                manager = instrumentation.manager_of_class(target)
                if manager:
                    return manager
                else:
                    return _InstanceEventsHold(target)
        return None 

# 需要導入模塊: from sqlalchemy import orm [as 別名]
# 或者: from sqlalchemy.orm import mapper [as 別名]
def instrument_class(self, mapper, class_):
        """Receive a class when the mapper is first constructed,
        before instrumentation is applied to the mapped class.

        This event is the earliest phase of mapper construction.
        Most attributes of the mapper are not yet initialized.

        This listener can either be applied to the :class:`.Mapper`
        class overall, or to any un-mapped class which serves as a base
        for classes that will be mapped (using the ``propagate=True`` flag)::

            Base = declarative_base()

            @event.listens_for(Base, "instrument_class", propagate=True)
            def on_new_class(mapper, cls_):
                " ... "

        :param mapper: the :class:`.Mapper` which is the target
         of this event.
        :param class\_: the mapped class.

        """ 

# 需要導入模塊: from sqlalchemy import orm [as 別名]
# 或者: from sqlalchemy.orm import mapper [as 別名]
def test_sql_bulk_insert_from_records__sqlite(self):
        engine, metadata = create_db_memory()
        fields = [
            Column("id", Integer(), primary_key=True, autoincrement=True),
            Column("sf_id", Unicode(24)),
        ]
        id_t = Table("TestTable", metadata, *fields)
        id_t.create()
        model = type("TestModel", (object,), {})
        mapper(model, id_t)

        util = bulkdata.utils.SqlAlchemyMixin()
        util.metadata = metadata
        session = create_session(bind=engine, autocommit=False)
        util.session = session
        connection = session.connection()

        util._sql_bulk_insert_from_records(
            connection=connection,
            table="TestTable",
            columns=("id", "sf_id"),
            record_iterable=([f"{x}", f"00100000000000{x}"] for x in range(10)),
        )

        assert session.query(model).count() == 10 

# 需要導入模塊: from sqlalchemy import orm [as 別名]
# 或者: from sqlalchemy.orm import mapper [as 別名]
def instrument_class(self, mapper, class_):
        r"""Receive a class when the mapper is first constructed,
        before instrumentation is applied to the mapped class.

        This event is the earliest phase of mapper construction.
        Most attributes of the mapper are not yet initialized.

        This listener can either be applied to the :class:`.Mapper`
        class overall, or to any un-mapped class which serves as a base
        for classes that will be mapped (using the ``propagate=True`` flag)::

            Base = declarative_base()

            @event.listens_for(Base, "instrument_class", propagate=True)
            def on_new_class(mapper, cls_):
                " ... "

        :param mapper: the :class:`.Mapper` which is the target
         of this event.
        :param class\_: the mapped class.

        """ 

# 需要導入模塊: from sqlalchemy import orm [as 別名]
# 或者: from sqlalchemy.orm import mapper [as 別名]
def loaded_as_persistent(self, session, instance):
        """Intercept the "loaded as persistent" transition for a specific object.

        This event is invoked within the ORM loading process, and is invoked
        very similarly to the :meth:`.InstanceEvents.load` event.  However,
        the event here is linkable to a :class:`.Session` class or instance,
        rather than to a mapper or class hierarchy, and integrates
        with the other session lifecycle events smoothly.  The object
        is guaranteed to be present in the session's identity map when
        this event is called.


        :param session: target :class:`.Session`

        :param instance: the ORM-mapped instance being operated upon.

        .. versionadded:: 1.1

        .. seealso::

            :ref:`session_lifecycle_events`

        """ 

# 需要導入模塊: from sqlalchemy import orm [as 別名]
# 或者: from sqlalchemy.orm import mapper [as 別名]
def instrument_class(self, mapper, class_):
        """Receive a class when the mapper is first constructed, and has
        applied instrumentation to the mapped class.

        The return value is only significant within the ``MapperExtension``
        chain; the parent mapper's behavior isn't modified by this method.

        """
        return EXT_CONTINUE 

# 需要導入模塊: from sqlalchemy import orm [as 別名]
# 或者: from sqlalchemy.orm import mapper [as 別名]
def init_instance(self, mapper, class_, oldinit, instance, args, kwargs):
        """Receive an instance when its constructor is called.

        This method is only called during a userland construction of
        an object.  It is not called when an object is loaded from the
        database.

        The return value is only significant within the ``MapperExtension``
        chain; the parent mapper's behavior isn't modified by this method.

        """
        return EXT_CONTINUE 

# 需要導入模塊: from sqlalchemy import orm [as 別名]
# 或者: from sqlalchemy.orm import mapper [as 別名]
def init_failed(self, mapper, class_, oldinit, instance, args, kwargs):
        """Receive an instance when its constructor has been called,
        and raised an exception.

        This method is only called during a userland construction of
        an object.  It is not called when an object is loaded from the
        database.

        The return value is only significant within the ``MapperExtension``
        chain; the parent mapper's behavior isn't modified by this method.

        """
        return EXT_CONTINUE 

# 需要導入模塊: from sqlalchemy import orm [as 別名]
# 或者: from sqlalchemy.orm import mapper [as 別名]
def before_update(self, mapper, connection, instance):
        """Receive an object instance before that instance is updated.

        Note that this method is called for all instances that are marked as
        "dirty", even those which have no net changes to their column-based
        attributes. An object is marked as dirty when any of its column-based
        attributes have a "set attribute" operation called or when any of its
        collections are modified. If, at update time, no column-based
        attributes have any net changes, no UPDATE statement will be issued.
        This means that an instance being sent to before_update is *not* a
        guarantee that an UPDATE statement will be issued (although you can
        affect the outcome here).

        To detect if the column-based attributes on the object have net
        changes, and will therefore generate an UPDATE statement, use
        ``object_session(instance).is_modified(instance,
        include_collections=False)``.

        Column-based attributes can be modified within this method
        which will result in the new value being updated.  However
        *no* changes to the overall flush plan can be made, and
        manipulation of the ``Session`` will not have the desired effect.
        To manipulate the ``Session`` within an extension, use
        ``SessionExtension``.

        The return value is only significant within the ``MapperExtension``
        chain; the parent mapper's behavior isn't modified by this method.

        """

        return EXT_CONTINUE 

# 需要導入模塊: from sqlalchemy import orm [as 別名]
# 或者: from sqlalchemy.orm import mapper [as 別名]
def after_update(self, mapper, connection, instance):
        """Receive an object instance after that instance is updated.

        The return value is only significant within the ``MapperExtension``
        chain; the parent mapper's behavior isn't modified by this method.

        """

        return EXT_CONTINUE 

# 需要導入模塊: from sqlalchemy import orm [as 別名]
# 或者: from sqlalchemy.orm import mapper [as 別名]
def before_delete(self, mapper, connection, instance):
        """Receive an object instance before that instance is deleted.

        Note that *no* changes to the overall flush plan can be made
        here; and manipulation of the ``Session`` will not have the
        desired effect. To manipulate the ``Session`` within an
        extension, use ``SessionExtension``.

        The return value is only significant within the ``MapperExtension``
        chain; the parent mapper's behavior isn't modified by this method.

        """

        return EXT_CONTINUE 

# 需要導入模塊: from sqlalchemy import orm [as 別名]
# 或者: from sqlalchemy.orm import mapper [as 別名]
def after_delete(self, mapper, connection, instance):
        """Receive an object instance after that instance is deleted.

        The return value is only significant within the ``MapperExtension``
        chain; the parent mapper's behavior isn't modified by this method.

        """

        return EXT_CONTINUE 

# 需要導入模塊: from sqlalchemy import orm [as 別名]
# 或者: from sqlalchemy.orm import mapper [as 別名]
def _listen(
            cls, event_key, raw=False, retval=False, propagate=False, **kw):
        target, identifier, fn = \
            event_key.dispatch_target, event_key.identifier, \
            event_key._listen_fn

        if identifier in ("before_configured", "after_configured") and \
                target is not mapperlib.Mapper:
            util.warn(
                "'before_configured' and 'after_configured' ORM events "
                "only invoke with the mapper() function or Mapper class "
                "as the target.")

        if not raw or not retval:
            if not raw:
                meth = getattr(cls, identifier)
                try:
                    target_index = \
                        inspect_getargspec(meth)[0].index('target') - 1
                except ValueError:
                    target_index = None

            def wrap(*arg, **kw):
                if not raw and target_index is not None:
                    arg = list(arg)
                    arg[target_index] = arg[target_index].obj()
                if not retval:
                    fn(*arg, **kw)
                    return interfaces.EXT_CONTINUE
                else:
                    return fn(*arg, **kw)
            event_key = event_key.with_wrapper(wrap)

        if propagate:
            for mapper in target.self_and_descendants:
                event_key.with_dispatch_target(mapper).base_listen(
                    propagate=True, **kw)
        else:
            event_key.base_listen(**kw)