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�

���g�G����ddlmZddlmZddlmZddlmZddlmZer*ddl	m
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ddlmZdd
lmZddlmZGd�dej(e�Zy)�)�annotations)�Any)�
TYPE_CHECKING�)�SchemaEventTarget�)�event)�Column)�
Constraint)�
SchemaItem)�Table)�
Connection)�ReflectedColumn)�	Inspectorc���eZdZdZdZeZ								dd�Z								dd�Z								dd�Z									dd�Z
						d
d�Z						d
d�Z						dd	�Z
								dd
�Zy)�	DDLEventsa;
    Define event listeners for schema objects,
    that is, :class:`.SchemaItem` and other :class:`.SchemaEventTarget`
    subclasses, including :class:`_schema.MetaData`, :class:`_schema.Table`,
    :class:`_schema.Column`, etc.

    **Create / Drop Events**

    Events emitted when CREATE and DROP commands are emitted to the database.
    The event hooks in this category include :meth:`.DDLEvents.before_create`,
    :meth:`.DDLEvents.after_create`, :meth:`.DDLEvents.before_drop`, and
    :meth:`.DDLEvents.after_drop`.

    These events are emitted when using schema-level methods such as
    :meth:`.MetaData.create_all` and :meth:`.MetaData.drop_all`. Per-object
    create/drop methods such as :meth:`.Table.create`, :meth:`.Table.drop`,
    :meth:`.Index.create` are also included, as well as dialect-specific
    methods such as :meth:`_postgresql.ENUM.create`.

    .. versionadded:: 2.0 :class:`.DDLEvents` event hooks now take place
       for non-table objects including constraints, indexes, and
       dialect-specific schema types.

    Event hooks may be attached directly to a :class:`_schema.Table` object or
    to a :class:`_schema.MetaData` collection, as well as to any
    :class:`.SchemaItem` class or object that can be individually created and
    dropped using a distinct SQL command. Such classes include :class:`.Index`,
    :class:`.Sequence`, and dialect-specific classes such as
    :class:`_postgresql.ENUM`.

    Example using the :meth:`.DDLEvents.after_create` event, where a custom
    event hook will emit an ``ALTER TABLE`` command on the current connection,
    after ``CREATE TABLE`` is emitted::

        from sqlalchemy import create_engine
        from sqlalchemy import event
        from sqlalchemy import Table, Column, Metadata, Integer

        m = MetaData()
        some_table = Table("some_table", m, Column("data", Integer))


        @event.listens_for(some_table, "after_create")
        def after_create(target, connection, **kw):
            connection.execute(
                text("ALTER TABLE %s SET name=foo_%s" % (target.name, target.name))
            )


        some_engine = create_engine("postgresql://scott:tiger@host/test")

        # will emit "CREATE TABLE some_table" as well as the above
        # "ALTER TABLE" statement afterwards
        m.create_all(some_engine)

    Constraint objects such as :class:`.ForeignKeyConstraint`,
    :class:`.UniqueConstraint`, :class:`.CheckConstraint` may also be
    subscribed to these events, however they will **not** normally produce
    events as these objects are usually rendered inline within an
    enclosing ``CREATE TABLE`` statement and implicitly dropped from a
    ``DROP TABLE`` statement.

    For the :class:`.Index` construct, the event hook will be emitted
    for ``CREATE INDEX``, however SQLAlchemy does not normally emit
    ``DROP INDEX`` when dropping tables as this is again implicit within the
    ``DROP TABLE`` statement.

    .. versionadded:: 2.0 Support for :class:`.SchemaItem` objects
       for create/drop events was expanded from its previous support for
       :class:`.MetaData` and :class:`.Table` to also include
       :class:`.Constraint` and all subclasses, :class:`.Index`,
       :class:`.Sequence` and some type-related constructs such as
       :class:`_postgresql.ENUM`.

    .. note:: These event hooks are only emitted within the scope of
       SQLAlchemy's create/drop methods; they are not necessarily supported
       by tools such as `alembic <https://alembic.sqlalchemy.org>`_.


    **Attachment Events**

    Attachment events are provided to customize
    behavior whenever a child schema element is associated
    with a parent, such as when a :class:`_schema.Column` is associated
    with its :class:`_schema.Table`, when a
    :class:`_schema.ForeignKeyConstraint`
    is associated with a :class:`_schema.Table`, etc.  These events include
    :meth:`.DDLEvents.before_parent_attach` and
    :meth:`.DDLEvents.after_parent_attach`.

    **Reflection Events**

    The :meth:`.DDLEvents.column_reflect` event is used to intercept
    and modify the in-Python definition of database columns when
    :term:`reflection` of database tables proceeds.

    **Use with Generic DDL**

    DDL events integrate closely with the
    :class:`.DDL` class and the :class:`.ExecutableDDLElement` hierarchy
    of DDL clause constructs, which are themselves appropriate
    as listener callables::

        from sqlalchemy import DDL

        event.listen(
            some_table,
            "after_create",
            DDL("ALTER TABLE %(table)s SET name=foo_%(table)s"),
        )

    **Event Propagation to MetaData Copies**

    For all :class:`.DDLEvent` events, the ``propagate=True`` keyword argument
    will ensure that a given event handler is propagated to copies of the
    object, which are made when using the :meth:`_schema.Table.to_metadata`
    method::

        from sqlalchemy import DDL

        metadata = MetaData()
        some_table = Table("some_table", metadata, Column("data", Integer))

        event.listen(
            some_table,
            "after_create",
            DDL("ALTER TABLE %(table)s SET name=foo_%(table)s"),
            propagate=True,
        )

        new_metadata = MetaData()
        new_table = some_table.to_metadata(new_metadata)

    The above :class:`.DDL` object will be associated with the
    :meth:`.DDLEvents.after_create` event for both the ``some_table`` and
    the ``new_table`` :class:`.Table` objects.

    .. seealso::

        :ref:`event_toplevel`

        :class:`.ExecutableDDLElement`

        :class:`.DDL`

        :ref:`schema_ddl_sequences`

    �SomeSchemaClassOrObjectc��y)a�Called before CREATE statements are emitted.

        :param target: the :class:`.SchemaObject`, such as a
         :class:`_schema.MetaData` or :class:`_schema.Table`
         but also including all create/drop objects such as
         :class:`.Index`, :class:`.Sequence`, etc.,
         object which is the target of the event.

         .. versionadded:: 2.0 Support for all :class:`.SchemaItem` objects
            was added.

        :param connection: the :class:`_engine.Connection` where the
         CREATE statement or statements will be emitted.
        :param \**kw: additional keyword arguments relevant
         to the event.  The contents of this dictionary
         may vary across releases, and include the
         list of tables being generated for a metadata-level
         event, the checkfirst flag, and other
         elements used by internal events.

        :func:`.event.listen` accepts the ``propagate=True``
        modifier for this event; when True, the listener function will
        be established for any copies made of the target object,
        i.e. those copies that are generated when
        :meth:`_schema.Table.to_metadata` is used.

        :func:`.event.listen` accepts the ``insert=True``
        modifier for this event; when True, the listener function will
        be prepended to the internal list of events upon discovery, and execute
        before registered listener functions that do not pass this argument.

        N���self�target�
connection�kws    �F/opt/hc_python/lib64/python3.12/site-packages/sqlalchemy/sql/events.py�
before_createzDDLEvents.before_create����c��y)a�Called after CREATE statements are emitted.

        :param target: the :class:`.SchemaObject`, such as a
         :class:`_schema.MetaData` or :class:`_schema.Table`
         but also including all create/drop objects such as
         :class:`.Index`, :class:`.Sequence`, etc.,
         object which is the target of the event.

         .. versionadded:: 2.0 Support for all :class:`.SchemaItem` objects
            was added.

        :param connection: the :class:`_engine.Connection` where the
         CREATE statement or statements have been emitted.
        :param \**kw: additional keyword arguments relevant
         to the event.  The contents of this dictionary
         may vary across releases, and include the
         list of tables being generated for a metadata-level
         event, the checkfirst flag, and other
         elements used by internal events.

        :func:`.event.listen` also accepts the ``propagate=True``
        modifier for this event; when True, the listener function will
        be established for any copies made of the target object,
        i.e. those copies that are generated when
        :meth:`_schema.Table.to_metadata` is used.

        Nrrs    r�after_createzDDLEvents.after_create�rrc��y)a�Called before DROP statements are emitted.

        :param target: the :class:`.SchemaObject`, such as a
         :class:`_schema.MetaData` or :class:`_schema.Table`
         but also including all create/drop objects such as
         :class:`.Index`, :class:`.Sequence`, etc.,
         object which is the target of the event.

         .. versionadded:: 2.0 Support for all :class:`.SchemaItem` objects
            was added.

        :param connection: the :class:`_engine.Connection` where the
         DROP statement or statements will be emitted.
        :param \**kw: additional keyword arguments relevant
         to the event.  The contents of this dictionary
         may vary across releases, and include the
         list of tables being generated for a metadata-level
         event, the checkfirst flag, and other
         elements used by internal events.

        :func:`.event.listen` also accepts the ``propagate=True``
        modifier for this event; when True, the listener function will
        be established for any copies made of the target object,
        i.e. those copies that are generated when
        :meth:`_schema.Table.to_metadata` is used.

        Nrrs    r�before_dropzDDLEvents.before_drop�rrc��y)a�Called after DROP statements are emitted.

        :param target: the :class:`.SchemaObject`, such as a
         :class:`_schema.MetaData` or :class:`_schema.Table`
         but also including all create/drop objects such as
         :class:`.Index`, :class:`.Sequence`, etc.,
         object which is the target of the event.

         .. versionadded:: 2.0 Support for all :class:`.SchemaItem` objects
            was added.

        :param connection: the :class:`_engine.Connection` where the
         DROP statement or statements have been emitted.
        :param \**kw: additional keyword arguments relevant
         to the event.  The contents of this dictionary
         may vary across releases, and include the
         list of tables being generated for a metadata-level
         event, the checkfirst flag, and other
         elements used by internal events.

        :func:`.event.listen` also accepts the ``propagate=True``
        modifier for this event; when True, the listener function will
        be established for any copies made of the target object,
        i.e. those copies that are generated when
        :meth:`_schema.Table.to_metadata` is used.

        Nrrs    r�
after_dropzDDLEvents.after_droprrc��y)aCalled before a :class:`.SchemaItem` is associated with
        a parent :class:`.SchemaItem`.

        :param target: the target object
        :param parent: the parent to which the target is being attached.

        :func:`.event.listen` also accepts the ``propagate=True``
        modifier for this event; when True, the listener function will
        be established for any copies made of the target object,
        i.e. those copies that are generated when
        :meth:`_schema.Table.to_metadata` is used.

        Nr�rr�parents   r�before_parent_attachzDDLEvents.before_parent_attach4rrc��y)a
Called after a :class:`.SchemaItem` is associated with
        a parent :class:`.SchemaItem`.

        :param target: the target object
        :param parent: the parent to which the target is being attached.

        :func:`.event.listen` also accepts the ``propagate=True``
        modifier for this event; when True, the listener function will
        be established for any copies made of the target object,
        i.e. those copies that are generated when
        :meth:`_schema.Table.to_metadata` is used.

        Nrr&s   r�after_parent_attachzDDLEvents.after_parent_attachErrc��y)zUinternal event hook used for primary key naming convention
        updates.

        Nr)r�const�cols   r�'_sa_event_column_added_to_pk_constraintz1DDLEvents._sa_event_column_added_to_pk_constraintVrrc��y)a�Called for each unit of 'column info' retrieved when
        a :class:`_schema.Table` is being reflected.

        This event is most easily used by applying it to a specific
        :class:`_schema.MetaData` instance, where it will take effect for
        all :class:`_schema.Table` objects within that
        :class:`_schema.MetaData` that undergo reflection::

            metadata = MetaData()


            @event.listens_for(metadata, "column_reflect")
            def receive_column_reflect(inspector, table, column_info):
                # receives for all Table objects that are reflected
                # under this MetaData
                ...


            # will use the above event hook
            my_table = Table("my_table", metadata, autoload_with=some_engine)

        .. versionadded:: 1.4.0b2 The :meth:`_events.DDLEvents.column_reflect`
           hook may now be applied to a :class:`_schema.MetaData` object as
           well as the :class:`_schema.MetaData` class itself where it will
           take place for all :class:`_schema.Table` objects associated with
           the targeted :class:`_schema.MetaData`.

        It may also be applied to the :class:`_schema.Table` class across
        the board::

            from sqlalchemy import Table


            @event.listens_for(Table, "column_reflect")
            def receive_column_reflect(inspector, table, column_info):
                # receives for all Table objects that are reflected
                ...

        It can also be applied to a specific :class:`_schema.Table` at the
        point that one is being reflected using the
        :paramref:`_schema.Table.listeners` parameter::

            t1 = Table(
                "my_table",
                autoload_with=some_engine,
                listeners=[("column_reflect", receive_column_reflect)],
            )

        The dictionary of column information as returned by the
        dialect is passed, and can be modified.  The dictionary
        is that returned in each element of the list returned
        by :meth:`.reflection.Inspector.get_columns`:

            * ``name`` - the column's name, is applied to the
              :paramref:`_schema.Column.name` parameter

            * ``type`` - the type of this column, which should be an instance
              of :class:`~sqlalchemy.types.TypeEngine`, is applied to the
              :paramref:`_schema.Column.type` parameter

            * ``nullable`` - boolean flag if the column is NULL or NOT NULL,
              is applied to the :paramref:`_schema.Column.nullable` parameter

            * ``default`` - the column's server default value.  This is
              normally specified as a plain string SQL expression, however the
              event can pass a :class:`.FetchedValue`, :class:`.DefaultClause`,
              or :func:`_expression.text` object as well.  Is applied to the
              :paramref:`_schema.Column.server_default` parameter

        The event is called before any action is taken against
        this dictionary, and the contents can be modified; the following
        additional keys may be added to the dictionary to further modify
        how the :class:`_schema.Column` is constructed:


            * ``key`` - the string key that will be used to access this
              :class:`_schema.Column` in the ``.c`` collection; will be applied
              to the :paramref:`_schema.Column.key` parameter. Is also used
              for ORM mapping.  See the section
              :ref:`mapper_automated_reflection_schemes` for an example.

            * ``quote`` - force or un-force quoting on the column name;
              is applied to the :paramref:`_schema.Column.quote` parameter.

            * ``info`` - a dictionary of arbitrary data to follow along with
              the :class:`_schema.Column`, is applied to the
              :paramref:`_schema.Column.info` parameter.

        :func:`.event.listen` also accepts the ``propagate=True``
        modifier for this event; when True, the listener function will
        be established for any copies made of the target object,
        i.e. those copies that are generated when
        :meth:`_schema.Table.to_metadata` is used.

        .. seealso::

            :ref:`mapper_automated_reflection_schemes` -
            in the ORM mapping documentation

            :ref:`automap_intercepting_columns` -
            in the :ref:`automap_toplevel` documentation

            :ref:`metadata_reflection_dbagnostic_types` - in
            the :ref:`metadata_reflection_toplevel` documentation

        Nr)r�	inspector�table�column_infos    r�column_reflectzDDLEvents.column_reflect^rrN)rrrrrr�return�None)rrr'rr4r5)r,rr-zColumn[Any]r4r5)r0rr1r
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__module__�__qualname__�__doc__�_target_class_docr�_dispatch_targetrr r"r$r(r*r.r3rrrrrs-��S�j2��(��"�'�"�5?�"�GJ�"�	
�"�H�'��5?��GJ��	
��>�'��5?��GJ��	
��>�'��5?��GJ��	
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��"���&1��	
��l�"�l�+0�l�?N�l�	
�lrrN)�
__future__r�typingrr�baser�r	�schemar
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�engine.baser�engine.interfacesr�engine.reflectionr�Eventsrrrr�<module>rEsF��#�� �#����"�"��(�3�-�p����.�/�pr

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