schema.py 文件源码

def append_column(self, column):
        """Append a :class:`~.schema.Column` to this :class:`~.schema.Table`.

        The "key" of the newly added :class:`~.schema.Column`, i.e. the
        value of its ``.key`` attribute, will then be available
        in the ``.c`` collection of this :class:`~.schema.Table`, and the
        column definition will be included in any CREATE TABLE, SELECT,
        UPDATE, etc. statements generated from this :class:`~.schema.Table`
        construct.

        Note that this does **not** change the definition of the table
        as it exists within any underlying database, assuming that
        table has already been created in the database.   Relational
        databases support the addition of columns to existing tables
        using the SQL ALTER command, which would need to be
        emitted for an already-existing table that doesn't contain
        the newly added column.

        """

        column._set_parent_with_dispatch(self)