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    Abstract base class for objects that can be used to compose an SQL string.

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    string.

    `!Composable` objects can be joined using the ``+`` operator: the result
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    A `Composable` object made of a sequence of `!Composable`.

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    Example::

        >>> comp = sql.Composed(
        ...     [sql.SQL("insert into "), sql.Identifier("table")])
        >>> print(comp.as_string(conn))
        insert into "table"

    `!Composed` objects are iterable (so they can be used in `SQL.join` for
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        Return a new `!Composed` interposing the *joiner* with the `!Composed` items.

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    A `Composable` representing a snippet of SQL statement.

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    names).

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    represent variable identifiers or values: you should only use it to pass
    constant strings representing templates or snippets of SQL statements; use
    other objects such as `Identifier` or `Literal` to represent variable
    parts.

    Example::

        >>> query = sql.SQL("select {0} from {1}").format(
        ...    sql.SQL(', ').join([sql.Identifier('foo'), sql.Identifier('bar')]),
        ...    sql.Identifier('table'))
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        select "foo", "bar" from "table"
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        Merge `Composable` objects into a template.

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        :param `Composable` kwargs: parameters to replace to named (``{name}``)
            placeholders
        :return: the union of the `!SQL` string with placeholders replaced
        :rtype: `Composed`

        The method is similar to the Python `str.format()` method: the string
        template supports auto-numbered (``{}``), numbered (``{0}``,
        ``{1}``...), and named placeholders (``{name}``), with positional
        arguments replacing the numbered placeholders and keywords replacing
        the named ones. However placeholder modifiers (``{0!r}``, ``{0:<10}``)
        are not supported. Only `!Composable` objects can be passed to the
        template.

        Example::

            >>> print(sql.SQL("select * from {} where {} = %s")
            ...     .format(sql.Identifier('people'), sql.Identifier('id'))
            ...     .as_string(conn))
            select * from "people" where "id" = %s

            >>> print(sql.SQL("select * from {tbl} where {pkey} = %s")
            ...     .format(tbl=sql.Identifier('people'), pkey=sql.Identifier('id'))
            ...     .as_string(conn))
            select * from "people" where "id" = %s

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        Note that `Composed` objects are iterable too, so they can be used as
        argument for this method.

        Example::

            >>> snip = sql.SQL(', ').join(
            ...     sql.Identifier(n) for n in ['foo', 'bar', 'baz'])
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    A `Composable` representing an SQL identifier or a dot-separated sequence.

    Identifiers usually represent names of database objects, such as tables or
    fields. PostgreSQL identifiers follow `different rules`__ than SQL string
    literals for escaping (e.g. they use double quotes instead of single).

    .. __: https://www.postgresql.org/docs/current/static/sql-syntax-lexical.html#         SQL-SYNTAX-IDENTIFIERS

    Example::

        >>> t1 = sql.Identifier("foo")
        >>> t2 = sql.Identifier("ba'r")
        >>> t3 = sql.Identifier('ba"z')
        >>> print(sql.SQL(', ').join([t1, t2, t3]).as_string(conn))
        "foo", "ba'r", "ba""z"

    Multiple strings can be passed to the object to represent a qualified name,
    i.e. a dot-separated sequence of identifiers.

    Example::

        >>> query = sql.SQL("select {} from {}").format(
        ...     sql.Identifier("table", "field"),
        ...     sql.Identifier("schema", "table"))
        >>> print(query.as_string(conn))
        select "table"."field" from "schema"."table"

    c���|std���|D]&}t|t��std����'t���|��dS)NzIdentifier cannot be emptyz$SQL identifier parts must be strings)r0rr@r2r
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    A `Composable` representing an SQL value to include in a query.

    Usually you will want to include placeholders in the query and pass values
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    include a literal value in the query you can use this object.

    The string returned by `!as_string()` follows the normal :ref:`adaptation
    rules <python-types-adaptation>` for Python objects.

    Example::

        >>> s1 = sql.Literal("foo")
        >>> s2 = sql.Literal("ba'r")
        >>> s3 = sql.Literal(42)
        >>> print(sql.SQL(', ').join([s1, s2, s3]).as_string(conn))
        'foo', 'ba''r', 42

    c��|jS)z%The object wrapped by the `!Literal`.rrs rrzLiteral.wrappedurJrc���t|tj��r|}n1t|tj��r|j}nt	d���tj|j��}t|d��r|�|��|�	��}t|t��r*|�tj|j
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�[�[�]�]���b�%� � �	9����3�=���7�8�8�B��	rN)rr*r+r,rCrrr-rrrsrsasH��������&����X������rrsc�F��eZdZdZd�fd�	Zed���Zd�Zd�Z�xZ	S)�Placeholdera�A `Composable` representing a placeholder for query parameters.

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    arguments.

    Examples::

        >>> names = ['foo', 'bar', 'baz']

        >>> q1 = sql.SQL("insert into table ({}) values ({})").format(
        ...     sql.SQL(', ').join(map(sql.Identifier, names)),
        ...     sql.SQL(', ').join(sql.Placeholder() * len(names)))
        >>> print(q1.as_string(conn))
        insert into table ("foo", "bar", "baz") values (%s, %s, %s)

        >>> q2 = sql.SQL("insert into table ({}) values ({})").format(
        ...     sql.SQL(', ').join(map(sql.Identifier, names)),
        ...     sql.SQL(', ').join(map(sql.Placeholder, names)))
        >>> print(q2.as_string(conn))
        insert into table ("foo", "bar", "baz") values (%(foo)s, %(bar)s, %(baz)s)

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����������rc��|jS)zThe name of the `!Placeholder`.rrs rrWzPlaceholder.name�rJrc�\�|j�|jj�d�S|jj�d|j�d�S)Nz()rr)r	rrrs rrzPlaceholder.__repr__�s<���=� ��n�-�1�1�1�1��n�-�B�B��
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