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a<>Represent the Postgresql HSTORE type.

    The :class:`.HSTORE` type stores dictionaries containing strings, e.g.::

        data_table = Table('data_table', metadata,
            Column('id', Integer, primary_key=True),
            Column('data', HSTORE)
        )

        with engine.connect() as conn:
            conn.execute(
                data_table.insert(),
                data = {"key1": "value1", "key2": "value2"}
            )

    :class:`.HSTORE` provides for a wide range of operations, including:

    * Index operations::

        data_table.c.data['some key'] == 'some value'

    * Containment operations::

        data_table.c.data.has_key('some key')

        data_table.c.data.has_all(['one', 'two', 'three'])

    * Concatenation::

        data_table.c.data + {"k1": "v1"}

    For a full list of special methods see
    :class:`.HSTORE.comparator_factory`.

    For usage with the SQLAlchemy ORM, it may be desirable to combine
    the usage of :class:`.HSTORE` with :class:`.MutableDict` dictionary
    now part of the :mod:`sqlalchemy.ext.mutable`
    extension.  This extension will allow "in-place" changes to the
    dictionary, e.g. addition of new keys or replacement/removal of existing
    keys to/from the current dictionary, to produce events which will be
    detected by the unit of work::

        from sqlalchemy.ext.mutable import MutableDict

        class MyClass(Base):
            __tablename__ = 'data_table'

            id = Column(Integer, primary_key=True)
            data = Column(MutableDict.as_mutable(HSTORE))

        my_object = session.query(MyClass).one()

        # in-place mutation, requires Mutable extension
        # in order for the ORM to detect
        my_object.data['some_key'] = 'some value'

        session.commit()

    When the :mod:`sqlalchemy.ext.mutable` extension is not used, the ORM
    will not be alerted to any changes to the contents of an existing
    dictionary, unless that dictionary value is re-assigned to the
    HSTORE-attribute itself, thus generating a change event.

    .. versionadded:: 0.8

    .. seealso::

        :class:`.hstore` - render the Postgresql ``hstore()`` function.


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        select([hstore('key1', 'value1')])

        select([
                hstore(
                    array(['key1', 'key2', 'key3']),
                    array(['value1', 'value2', 'value3'])
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