Function values

lib/sqlalchemy/sql/_selectable_constructors.py:754–840

r"""Construct a :class:`_expression.Values` construct representing the SQL ``VALUES`` clause. The column expressions and the actual data for :class:`_expression.Values` are given in two separate steps. The constructor receives the column expressions typically as :func:`_expression.

(
    *columns: _OnlyColumnArgument[Any],
    name: Optional[str] = None,
    literal_binds: bool = False,
)

def values(
    *columns: _OnlyColumnArgument[Any],
    name: Optional[str] = None,
    literal_binds: bool = False,
) -> Values:
    r"""Construct a :class:`_expression.Values` construct representing the
    SQL ``VALUES`` clause.

    The column expressions and the actual data for :class:`_expression.Values`
    are given in two separate steps.  The constructor receives the column
    expressions typically as :func:`_expression.column` constructs, and the
    data is then passed via the :meth:`_expression.Values.data` method as a
    list, which can be called multiple times to add more data, e.g.::

        from sqlalchemy import column
        from sqlalchemy import values
        from sqlalchemy import Integer
        from sqlalchemy import String

        value_expr = (
            values(
                column("id", Integer),
                column("name", String),
            )
            .data([(1, "name1"), (2, "name2")])
            .data([(3, "name3")])
        )

    Would represent a SQL fragment like::

        VALUES(1, "name1"), (2, "name2"), (3, "name3")

    The :class:`_sql.values` construct has an optional
    :paramref:`_sql.values.name` field; when using this field, the
    PostgreSQL-specific "named VALUES" clause may be generated::

        value_expr = values(
            column("id", Integer), column("name", String), name="somename"
        ).data([(1, "name1"), (2, "name2"), (3, "name3")])

    When selecting from the above construct, the name and column names will
    be listed out using a PostgreSQL-specific syntax::

        >>> print(value_expr.select())
        SELECT somename.id, somename.name
        FROM (VALUES (:param_1, :param_2), (:param_3, :param_4),
        (:param_5, :param_6)) AS somename (id, name)

    For a more database-agnostic means of SELECTing named columns from a
    VALUES expression, the :meth:`.Values.cte` method may be used, which
    produces a named CTE with explicit column names against the VALUES
    construct within; this syntax works on PostgreSQL, SQLite, and MariaDB::

        value_expr = (
            values(
                column("id", Integer),
                column("name", String),
            )