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Z=Gd?d@<00>d@e&<00>Z>GdAdB<00>dBe><00>Z?dS)Ca/The schema module provides the building blocks for database metadata.

Each element within this module describes a database entity which can be
created and dropped, or is otherwise part of such an entity.  Examples include
tables, columns, sequences, and indexes.

All entities are subclasses of :class:`~sqlalchemy.schema.SchemaItem`, and as
defined in this module they are intended to be agnostic of any vendor-specific
constructs.

A collection of entities are grouped into a unit called
:class:`~sqlalchemy.schema.MetaData`. MetaData serves as a logical grouping of
schema elements, and can also be associated with an actual database connection
such that operations involving the contained elements can contact the database
as needed.

Two of the elements here also build upon their "syntactic" counterparts, which
are defined in :class:`~sqlalchemy.sql.expression.`, specifically
:class:`~sqlalchemy.schema.Table` and :class:`~sqlalchemy.schema.Column`.
Since these objects are part of the SQL expression language, they are usable
as components in SQL expressions.

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    e.g.::

        mytable = Table("mytable", metadata,
                        Column('mytable_id', Integer, primary_key=True),
                        Column('value', String(50))
                   )

    The :class:`.Table` object constructs a unique instance of itself based
    on its name and optional schema name within the given
    :class:`.MetaData` object. Calling the :class:`.Table`
    constructor with the same name and same :class:`.MetaData` argument
    a second time will return the *same* :class:`.Table` object - in this way
    the :class:`.Table` constructor acts as a registry function.

    .. seealso::

        :ref:`metadata_describing` - Introduction to database metadata

    Constructor arguments are as follows:

    :param name: The name of this table as represented in the database.

        The table name, along with the value of the ``schema`` parameter,
        forms a key which uniquely identifies this :class:`.Table` within
        the owning :class:`.MetaData` collection.
        Additional calls to :class:`.Table` with the same name, metadata,
        and schema name will return the same :class:`.Table` object.

        Names which contain no upper case characters
        will be treated as case insensitive names, and will not be quoted
        unless they are a reserved word or contain special characters.
        A name with any number of upper case characters is considered
        to be case sensitive, and will be sent as quoted.

        To enable unconditional quoting for the table name, specify the flag
        ``quote=True`` to the constructor, or use the :class:`.quoted_name`
        construct to specify the name.

    :param metadata: a :class:`.MetaData` object which will contain this
        table.  The metadata is used as a point of association of this table
        with other tables which are referenced via foreign key.  It also
        may be used to associate this table with a particular
        :class:`.Connectable`.

    :param \*args: Additional positional arguments are used primarily
        to add the list of :class:`.Column` objects contained within this
        table. Similar to the style of a CREATE TABLE statement, other
        :class:`.SchemaItem` constructs may be added here, including
        :class:`.PrimaryKeyConstraint`, and :class:`.ForeignKeyConstraint`.

    :param autoload: Defaults to False, unless :paramref:`.Table.autoload_with`
        is set in which case it defaults to True; :class:`.Column` objects
        for this table should be reflected from the database, possibly
        augmenting or replacing existing :class:`.Column` objects that were
        expicitly specified.

        .. versionchanged:: 1.0.0 setting the :paramref:`.Table.autoload_with`
           parameter implies that :paramref:`.Table.autoload` will default
           to True.

        .. seealso::

            :ref:`metadata_reflection_toplevel`

    :param autoload_replace: Defaults to ``True``; when using
        :paramref:`.Table.autoload`
        in conjunction with :paramref:`.Table.extend_existing`, indicates
        that :class:`.Column` objects present in the already-existing
        :class:`.Table` object should be replaced with columns of the same
        name retrieved from the autoload process.   When ``False``, columns
        already present under existing names will be omitted from the
        reflection process.

        Note that this setting does not impact :class:`.Column` objects
        specified programmatically within the call to :class:`.Table` that
        also is autoloading; those :class:`.Column` objects will always
        replace existing columns of the same name when
        :paramref:`.Table.extend_existing` is ``True``.

        .. versionadded:: 0.7.5

        .. seealso::

            :paramref:`.Table.autoload`

            :paramref:`.Table.extend_existing`

    :param autoload_with: An :class:`.Engine` or :class:`.Connection` object
        with which this :class:`.Table` object will be reflected; when
        set to a non-None value, it implies that :paramref:`.Table.autoload`
        is ``True``.   If left unset, but :paramref:`.Table.autoload` is
        explicitly set to ``True``, an autoload operation will attempt to
        proceed by locating an :class:`.Engine` or :class:`.Connection` bound
        to the underlying :class:`.MetaData` object.

        .. seealso::

            :paramref:`.Table.autoload`

    :param extend_existing: When ``True``, indicates that if this
        :class:`.Table` is already present in the given :class:`.MetaData`,
        apply further arguments within the constructor to the existing
        :class:`.Table`.

        If :paramref:`.Table.extend_existing` or
        :paramref:`.Table.keep_existing` are not set, and the given name
        of the new :class:`.Table` refers to a :class:`.Table` that is
        already present in the target :class:`.MetaData` collection, and
        this :class:`.Table` specifies additional columns or other constructs
        or flags that modify the table's state, an
        error is raised.  The purpose of these two mutually-exclusive flags
        is to specify what action should be taken when a :class:`.Table`
        is specified that matches an existing :class:`.Table`, yet specifies
        additional constructs.

        :paramref:`.Table.extend_existing` will also work in conjunction
        with :paramref:`.Table.autoload` to run a new reflection
        operation against the database, even if a :class:`.Table`
        of the same name is already present in the target
        :class:`.MetaData`; newly reflected :class:`.Column` objects
        and other options will be added into the state of the
        :class:`.Table`, potentially overwriting existing columns
        and options of the same name.

        .. versionchanged:: 0.7.4 :paramref:`.Table.extend_existing` will
           invoke a new reflection operation when combined with
           :paramref:`.Table.autoload` set to True.

        As is always the case with :paramref:`.Table.autoload`,
        :class:`.Column` objects can be specified in the same :class:`.Table`
        constructor, which will take precedence.  Below, the existing
        table ``mytable`` will be augmented with :class:`.Column` objects
        both reflected from the database, as well as the given :class:`.Column`
        named "y"::

            Table("mytable", metadata,
                        Column('y', Integer),
                        extend_existing=True,
                        autoload=True,
                        autoload_with=engine
                    )

        .. seealso::

            :paramref:`.Table.autoload`

            :paramref:`.Table.autoload_replace`

            :paramref:`.Table.keep_existing`


    :param implicit_returning: True by default - indicates that
        RETURNING can be used by default to fetch newly inserted primary key
        values, for backends which support this.  Note that
        create_engine() also provides an implicit_returning flag.

    :param include_columns: A list of strings indicating a subset of
        columns to be loaded via the ``autoload`` operation; table columns who
        aren't present in this list will not be represented on the resulting
        ``Table`` object. Defaults to ``None`` which indicates all columns
        should be reflected.

    :param info: Optional data dictionary which will be populated into the
        :attr:`.SchemaItem.info` attribute of this object.

    :param keep_existing: When ``True``, indicates that if this Table
        is already present in the given :class:`.MetaData`, ignore
        further arguments within the constructor to the existing
        :class:`.Table`, and return the :class:`.Table` object as
        originally created. This is to allow a function that wishes
        to define a new :class:`.Table` on first call, but on
        subsequent calls will return the same :class:`.Table`,
        without any of the declarations (particularly constraints)
        being applied a second time.

        If :paramref:`.Table.extend_existing` or
        :paramref:`.Table.keep_existing` are not set, and the given name
        of the new :class:`.Table` refers to a :class:`.Table` that is
        already present in the target :class:`.MetaData` collection, and
        this :class:`.Table` specifies additional columns or other constructs
        or flags that modify the table's state, an
        error is raised.  The purpose of these two mutually-exclusive flags
        is to specify what action should be taken when a :class:`.Table`
        is specified that matches an existing :class:`.Table`, yet specifies
        additional constructs.

        .. seealso::

            :paramref:`.Table.extend_existing`

    :param listeners: A list of tuples of the form ``(<eventname>, <fn>)``
        which will be passed to :func:`.event.listen` upon construction.
        This alternate hook to :func:`.event.listen` allows the establishment
        of a listener function specific to this :class:`.Table` before
        the "autoload" process begins.  Particularly useful for
        the :meth:`.DDLEvents.column_reflect` event::

            def listen_for_reflect(table, column_info):
                "handle the column reflection event"
                # ...

            t = Table(
                'sometable',
                autoload=True,
                listeners=[
                    ('column_reflect', listen_for_reflect)
                ])

    :param mustexist: When ``True``, indicates that this Table must already
        be present in the given :class:`.MetaData` collection, else
        an exception is raised.

    :param prefixes:
        A list of strings to insert after CREATE in the CREATE TABLE
        statement.  They will be separated by spaces.

    :param quote: Force quoting of this table's name on or off, corresponding
        to ``True`` or ``False``.  When left at its default of ``None``,
        the column identifier will be quoted according to whether the name is
        case sensitive (identifiers with at least one upper case character are
        treated as case sensitive), or if it's a reserved word.  This flag
        is only needed to force quoting of a reserved word which is not known
        by the SQLAlchemy dialect.

    :param quote_schema: same as 'quote' but applies to the schema identifier.

    :param schema: The schema name for this table, which is required if
        the table resides in a schema other than the default selected schema
        for the engine's database connection.  Defaults to ``None``.

        If the owning :class:`.MetaData` of this :class:`.Table` specifies
        its own :paramref:`.MetaData.schema` parameter, then that schema
        name will be applied to this :class:`.Table` if the schema parameter
        here is set to ``None``.  To set a blank schema name on a :class:`.Table`
        that would otherwise use the schema set on the owning :class:`.MetaData`,
        specify the special symbol :attr:`.BLANK_SCHEMA`.

        .. versionadded:: 1.0.14  Added the :attr:`.BLANK_SCHEMA` symbol to
           allow a :class:`.Table` to have a blank schema name even when the
           parent :class:`.MetaData` specifies :paramref:`.MetaData.schema`.

        The quoting rules for the schema name are the same as those for the
        ``name`` parameter, in that quoting is applied for reserved words or
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        schema name, specify the flag
        ``quote_schema=True`` to the constructor, or use the
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    :param useexisting: Deprecated.  Use :paramref:`.Table.extend_existing`.

    :param \**kw: Additional keyword arguments not mentioned above are
        dialect specific, and passed in the form ``<dialectname>_<argname>``.
        See the documentation regarding an individual dialect at
        :ref:`dialect_toplevel` for detail on documented arguments.

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          The name field may be omitted at construction time and applied
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          remote :class:`.Column` object.

          .. versionchanged:: 0.9.0
            Support for propagation of type to a :class:`.Column` from its
            :class:`.ForeignKey` object has been improved and should be
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        :param \*args: Additional positional arguments include various
          :class:`.SchemaItem` derived constructs which will be applied
          as options to the column.  These include instances of
          :class:`.Constraint`, :class:`.ForeignKey`, :class:`.ColumnDefault`,
          and :class:`.Sequence`.  In some cases an equivalent keyword
          argument is available such as ``server_default``, ``default``
          and ``unique``.

        :param autoincrement: This flag may be set to ``False`` to
          indicate an integer primary key column that should not be
          considered to be the "autoincrement" column, that is
          the integer primary key column which generates values
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          with a single integer primary key column.  If the table
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          integer column, set this flag to True only on the
          column that should be considered "autoincrement".

          The setting *only* has an effect for columns which are:

          * Integer derived (i.e. INT, SMALLINT, BIGINT).

          * Part of the primary key

          * Not refering to another column via :class:`.ForeignKey`, unless
            the value is specified as ``'ignore_fk'``::

                # turn on autoincrement for this column despite
                # the ForeignKey()
                Column('id', ForeignKey('other.id'),
                            primary_key=True, autoincrement='ignore_fk')

            It is typically not desirable to have "autoincrement" enabled
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            primary key column elsewhere.

          * have no server side or client side defaults (with the exception
            of Postgresql SERIAL).

          The setting has these two effects on columns that meet the
          above criteria:

          * DDL issued for the column will include database-specific
            keywords intended to signify this column as an
            "autoincrement" column, such as AUTO INCREMENT on MySQL,
            SERIAL on Postgresql, and IDENTITY on MS-SQL.  It does
            *not* issue AUTOINCREMENT for SQLite since this is a
            special SQLite flag that is not required for autoincrementing
            behavior.

            .. seealso::

                :ref:`sqlite_autoincrement`

          * The column will be considered to be available as
            cursor.lastrowid or equivalent, for those dialects which
            "post fetch" newly inserted identifiers after a row has
            been inserted (SQLite, MySQL, MS-SQL).  It does not have
            any effect in this regard for databases that use sequences
            to generate primary key identifiers (i.e. Firebird, Postgresql,
            Oracle).

          .. versionchanged:: 0.7.4
              ``autoincrement`` accepts a special value ``'ignore_fk'``
              to indicate that autoincrementing status regardless of foreign
              key references.  This applies to certain composite foreign key
              setups, such as the one demonstrated in the ORM documentation
              at :ref:`post_update`.

        :param default: A scalar, Python callable, or
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            *default value* for this column, which will be invoked upon insert
            if this column is otherwise not specified in the VALUES clause of
            the insert. This is a shortcut to using :class:`.ColumnDefault` as
            a positional argument; see that class for full detail on the
            structure of the argument.

            Contrast this argument to :paramref:`.Column.server_default`
            which creates a default generator on the database side.

            .. seealso::

                :ref:`metadata_defaults_toplevel`

        :param doc: optional String that can be used by the ORM or similar
            to document attributes.   This attribute does not render SQL
            comments (a future attribute 'comment' will achieve that).

        :param key: An optional string identifier which will identify this
            ``Column`` object on the :class:`.Table`. When a key is provided,
            this is the only identifier referencing the ``Column`` within the
            application, including ORM attribute mapping; the ``name`` field
            is used only when rendering SQL.

        :param index: When ``True``, indicates that the column is indexed.
            This is a shortcut for using a :class:`.Index` construct on the
            table. To specify indexes with explicit names or indexes that
            contain multiple columns, use the :class:`.Index` construct
            instead.

        :param info: Optional data dictionary which will be populated into the
            :attr:`.SchemaItem.info` attribute of this object.

        :param nullable: If set to the default of ``True``, indicates the
            column will be rendered as allowing NULL, else it's rendered as
            NOT NULL. This parameter is only used when issuing CREATE TABLE
            statements.

        :param onupdate: A scalar, Python callable, or
            :class:`~sqlalchemy.sql.expression.ClauseElement` representing a
            default value to be applied to the column within UPDATE
            statements, which wil be invoked upon update if this column is not
            present in the SET clause of the update. This is a shortcut to
            using :class:`.ColumnDefault` as a positional argument with
            ``for_update=True``.

        :param primary_key: If ``True``, marks this column as a primary key
            column. Multiple columns can have this flag set to specify
            composite primary keys. As an alternative, the primary key of a
            :class:`.Table` can be specified via an explicit
            :class:`.PrimaryKeyConstraint` object.

        :param server_default: A :class:`.FetchedValue` instance, str, Unicode
            or :func:`~sqlalchemy.sql.expression.text` construct representing
            the DDL DEFAULT value for the column.

            String types will be emitted as-is, surrounded by single quotes::

                Column('x', Text, server_default="val")

                x TEXT DEFAULT 'val'

            A :func:`~sqlalchemy.sql.expression.text` expression will be
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                Column('y', DateTime, server_default=text('NOW()'))

                y DATETIME DEFAULT NOW()

            Strings and text() will be converted into a
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            Use :class:`.FetchedValue` to indicate that an already-existing
            column will generate a default value on the database side which
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            .. seealso::

                :ref:`server_defaults`

        :param server_onupdate:   A :class:`.FetchedValue` instance
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        :param quote: Force quoting of this column's name on or off,
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        :param unique: When ``True``, indicates that this column contains a
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        :param system: When ``True``, indicates this is a "system" column,
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             For more elaborate scenarios where columns should be
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          ``link_to_name`` is True.

        :param refcolumns: A sequence of foreign column names or Column
          objects. The columns must all be located within the same Table.

        :param name: Optional, the in-database name of the key.

        :param onupdate: Optional string. If set, emit ON UPDATE <value> when
          issuing DDL for this constraint. Typical values include CASCADE,
          DELETE and RESTRICT.

        :param ondelete: Optional string. If set, emit ON DELETE <value> when
          issuing DDL for this constraint. Typical values include CASCADE,
          DELETE and RESTRICT.

        :param deferrable: Optional bool. If set, emit DEFERRABLE or NOT
          DEFERRABLE when issuing DDL for this constraint.

        :param initially: Optional string. If set, emit INITIALLY <value> when
          issuing DDL for this constraint.

        :param link_to_name: if True, the string name given in ``column`` is
          the rendered name of the referenced column, not its locally assigned
          ``key``.

        :param use_alter: If True, do not emit the DDL for this constraint as
          part of the CREATE TABLE definition. Instead, generate it via an
          ALTER TABLE statement issued after the full collection of tables
          have been created, and drop it via an ALTER TABLE statement before
          the full collection of tables are dropped.

          The use of :paramref:`.ForeignKeyConstraint.use_alter` is
          particularly geared towards the case where two or more tables
          are established within a mutually-dependent foreign key constraint
          relationship; however, the :meth:`.MetaData.create_all` and
          :meth:`.MetaData.drop_all` methods will perform this resolution
          automatically, so the flag is normally not needed.

          .. versionchanged:: 1.0.0  Automatic resolution of foreign key
             cycles has been added, removing the need to use the
             :paramref:`.ForeignKeyConstraint.use_alter` in typical use
             cases.

          .. seealso::

                :ref:`use_alter`

        :param match: Optional string. If set, emit MATCH <value> when issuing
          DDL for this constraint. Typical values include SIMPLE, PARTIAL
          and FULL.

        :param info: Optional data dictionary which will be populated into the
            :attr:`.SchemaItem.info` attribute of this object.

            .. versionadded:: 1.0.0

        :param \**dialect_kw:  Additional keyword arguments are dialect
          specific, and passed in the form ``<dialectname>_<argname>``.  See
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            .. versionadded:: 0.9.2

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A table-level PRIMARY KEY constraint.

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    the :paramref:`.Column.primary_key` flag::

        >>> my_table = Table('mytable', metadata,
        ...                 Column('id', Integer, primary_key=True),
        ...                 Column('version_id', Integer, primary_key=True),
        ...                 Column('data', String(50))
        ...     )
        >>> my_table.primary_key
        PrimaryKeyConstraint(
            Column('id', Integer(), table=<mytable>,
                   primary_key=True, nullable=False),
            Column('version_id', Integer(), table=<mytable>,
                   primary_key=True, nullable=False)
        )

    The primary key of a :class:`.Table` can also be specified by using
    a :class:`.PrimaryKeyConstraint` object explicitly; in this mode of usage,
    the "name" of the constraint can also be specified, as well as other
    options which may be recognized by dialects::

        my_table = Table('mytable', metadata,
                    Column('id', Integer),
                    Column('version_id', Integer),
                    Column('data', String(50)),
                    PrimaryKeyConstraint('id', 'version_id',
                                         name='mytable_pk')
                )

    The two styles of column-specification should generally not be mixed.
    An warning is emitted if the columns present in the
    :class:`.PrimaryKeyConstraint`
    don't match the columns that were marked as ``primary_key=True``, if both
    are present; in this case, the columns are taken strictly from the
    :class:`.PrimaryKeyConstraint` declaration, and those columns otherwise
    marked as ``primary_key=True`` are ignored.  This behavior is intended to
    be backwards compatible with previous behavior.

    .. versionchanged:: 0.9.2  Using a mixture of columns within a
       :class:`.PrimaryKeyConstraint` in addition to columns marked as
       ``primary_key=True`` now emits a warning if the lists don't match.
       The ultimate behavior of ignoring those columns marked with the flag
       only is currently maintained for backwards compatibility; this warning
       may raise an exception in a future release.

    For the use case where specific options are to be specified on the
    :class:`.PrimaryKeyConstraint`, but the usual style of using
    ``primary_key=True`` flags is still desirable, an empty
    :class:`.PrimaryKeyConstraint` may be specified, which will take on the
    primary key column collection from the :class:`.Table` based on the
    flags::

        my_table = Table('mytable', metadata,
                    Column('id', Integer, primary_key=True),
                    Column('version_id', Integer, primary_key=True),
                    Column('data', String(50)),
                    PrimaryKeyConstraint(name='mytable_pk',
                                         mssql_clustered=True)
                )

    .. versionadded:: 0.9.2 an empty :class:`.PrimaryKeyConstraint` may now
       be specified for the purposes of establishing keyword arguments with
       the constraint, independently of the specification of "primary key"
       columns within the :class:`.Table` itself; columns marked as
       ``primary_key=True`` will be gathered into the empty constraint's
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        :class:`.PrimaryKeyConstraint` object on the parent
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    Zunique_constraintN)r6r7r8r9r:rrrrr<>
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    E.g.::

        sometable = Table("sometable", metadata,
                        Column("name", String(50)),
                        Column("address", String(100))
                    )

        Index("some_index", sometable.c.name)

    For a no-frills, single column index, adding
    :class:`.Column` also supports ``index=True``::

        sometable = Table("sometable", metadata,
                        Column("name", String(50), index=True)
                    )

    For a composite index, multiple columns can be specified::

        Index("some_index", sometable.c.name, sometable.c.address)

    Functional indexes are supported as well, typically by using the
    :data:`.func` construct in conjunction with table-bound
    :class:`.Column` objects::

        Index("some_index", func.lower(sometable.c.name))

    .. versionadded:: 0.8 support for functional and expression-based indexes.

    An :class:`.Index` can also be manually associated with a :class:`.Table`,
    either through inline declaration or using
    :meth:`.Table.append_constraint`.  When this approach is used, the names
    of the indexed columns can be specified as strings::

        Table("sometable", metadata,
                        Column("name", String(50)),
                        Column("address", String(100)),
                        Index("some_index", "name", "address")
                )

    To support functional or expression-based indexes in this form, the
    :func:`.text` construct may be used::

        from sqlalchemy import text

        Table("sometable", metadata,
                        Column("name", String(50)),
                        Column("address", String(100)),
                        Index("some_index", text("lower(name)"))
                )

    .. versionadded:: 0.9.5 the :func:`.text` construct may be used to
       specify :class:`.Index` expressions, provided the :class:`.Index`
       is explicitly associated with the :class:`.Table`.


    .. seealso::

        :ref:`schema_indexes` - General information on :class:`.Index`.

        :ref:`postgresql_indexes` - PostgreSQL-specific options available for
        the :class:`.Index` construct.

        :ref:`mysql_indexes` - MySQL-specific options available for the
        :class:`.Index` construct.

        :ref:`mssql_indexes` - MSSQL-specific options available for the
        :class:`.Index` construct.

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          :class:`.Column`.

        :param unique=False:
            Keyword only argument; if True, create a unique index.

        :param quote=None:
            Keyword only argument; whether to apply quoting to the name of
            the index.  Works in the same manner as that of
            :paramref:`.Column.quote`.

        :param info=None: Optional data dictionary which will be populated
            into the :attr:`.SchemaItem.info` attribute of this object.

            .. versionadded:: 1.0.0

        :param \**kw: Additional keyword arguments not mentioned above are
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    :class:`.Connection`.  If bound, the :class:`.Table` objects
    in the collection and their columns may participate in implicit SQL
    execution.

    The :class:`.Table` objects themselves are stored in the
    :attr:`.MetaData.tables` dictionary.

    :class:`.MetaData` is a thread-safe object for read operations.
    Construction of new tables within a single :class:`.MetaData` object,
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    .. seealso::

        :ref:`metadata_describing` - Introduction to database metadata

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          be bound to the resulting engine.

        :param reflect:
          Optional, automatically load all tables from the bound database.
          Defaults to False. ``bind`` is required when this option is set.

          .. deprecated:: 0.8
                Please use the :meth:`.MetaData.reflect` method.

        :param schema:
           The default schema to use for the :class:`.Table`,
           :class:`.Sequence`, and potentially other objects associated with
           this :class:`.MetaData`. Defaults to ``None``.

           When this value is set, any :class:`.Table` or :class:`.Sequence`
           which specifies ``None`` for the schema parameter will instead
           have this schema name defined.  To build a :class:`.Table`
           or :class:`.Sequence` that still has ``None`` for the schema
           even when this parameter is present, use the :attr:`.BLANK_SCHEMA`
           symbol.

           .. seealso::

                :paramref:`.Table.schema`

                :paramref:`.Sequence.schema`

        :param quote_schema:
            Sets the ``quote_schema`` flag for those :class:`.Table`,
            :class:`.Sequence`, and other objects which make usage of the
            local ``schema`` name.

        :param info: Optional data dictionary which will be populated into the
            :attr:`.SchemaItem.info` attribute of this object.

            .. versionadded:: 1.0.0

        :param naming_convention: a dictionary referring to values which
          will establish default naming conventions for :class:`.Constraint`
          and :class:`.Index` objects, for those objects which are not given
          a name explicitly.

          The keys of this dictionary may be:

          * a constraint or Index class, e.g. the :class:`.UniqueConstraint`,
            :class:`.ForeignKeyConstraint` class, the :class:`.Index` class

          * a string mnemonic for one of the known constraint classes;
            ``"fk"``, ``"pk"``, ``"ix"``, ``"ck"``, ``"uq"`` for foreign key,
            primary key, index, check, and unique constraint, respectively.

          * the string name of a user-defined "token" that can be used
            to define new naming tokens.

          The values associated with each "constraint class" or "constraint
          mnemonic" key are string naming templates, such as
          ``"uq_%(table_name)s_%(column_0_name)s"``,
          which describe how the name should be composed.  The values
          associated with user-defined "token" keys should be callables of the
          form ``fn(constraint, table)``, which accepts the constraint/index
          object and :class:`.Table` as arguments, returning a string
          result.

          The built-in names are as follows, some of which may only be
          available for certain types of constraint:

            * ``%(table_name)s`` - the name of the :class:`.Table` object
              associated with the constraint.

            * ``%(referred_table_name)s`` - the name of the :class:`.Table`
              object associated with the referencing target of a
              :class:`.ForeignKeyConstraint`.

            * ``%(column_0_name)s`` - the name of the :class:`.Column` at
              index position "0" within the constraint.

            * ``%(column_0_label)s`` - the label of the :class:`.Column` at
              index position "0", e.g. :attr:`.Column.label`

            * ``%(column_0_key)s`` - the key of the :class:`.Column` at
              index position "0", e.g. :attr:`.Column.key`

            * ``%(referred_column_0_name)s`` - the name of a :class:`.Column`
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              :class:`.ForeignKeyConstraint`.

            * ``%(constraint_name)s`` - a special key that refers to the
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              replaced with one that is composed from template string that
              uses this token. When this token is present, it is required that
              the :class:`.Constraint` is given an expicit name ahead of time.

            * user-defined: any additional token may be implemented by passing
              it along with a ``fn(constraint, table)`` callable to the
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