Python sqlalchemy 模块，NVARCHAR 实例源码

def create_table(self, name, *columns, **kw):
        """Issue a "create table" instruction using the current migration context.

        This directive receives an argument list similar to that of the
        traditional :class:`sqlalchemy.schema.Table` construct, but without the
        metadata::

            from sqlalchemy import INTEGER, VARCHAR, NVARCHAR, Column
            from alembic import op

            op.create_table(
                'account',
                Column('id', INTEGER, primary_key=True),
                Column('name', VARCHAR(50), nullable=False),
                Column('description', NVARCHAR(200))
                Column('timestamp', TIMESTAMP, server_default=func.now())
            )

        Note that :meth:`.create_table` accepts :class:`~sqlalchemy.schema.Column`
        constructs directly from the SQLAlchemy library.  In particular,
        default values to be created on the database side are
        specified using the ``server_default`` parameter, and not
        ``default`` which only specifies Python-side defaults::

            from alembic import op
            from sqlalchemy import Column, TIMESTAMP, func

            # specify "DEFAULT NOW" along with the "timestamp" column
            op.create_table('account',
                Column('id', INTEGER, primary_key=True),
                Column('timestamp', TIMESTAMP, server_default=func.now())
            )

        :param name: Name of the table
        :param \*columns: collection of :class:`~sqlalchemy.schema.Column`
         objects within
         the table, as well as optional :class:`~sqlalchemy.schema.Constraint`
         objects
         and :class:`~.sqlalchemy.schema.Index` objects.
        :param schema: Optional schema name to operate within.
        :param \**kw: Other keyword arguments are passed to the underlying
         :class:`sqlalchemy.schema.Table` object created for the command.

        """
        self.impl.create_table(
            self._table(name, *columns, **kw)
        )

def create_table(self, name, *columns, **kw):
        """Issue a "create table" instruction using the current migration context.

        This directive receives an argument list similar to that of the
        traditional :class:`sqlalchemy.schema.Table` construct, but without the
        metadata::

            from sqlalchemy import INTEGER, VARCHAR, NVARCHAR, Column
            from alembic import op

            op.create_table(
                'account',
                Column('id', INTEGER, primary_key=True),
                Column('name', VARCHAR(50), nullable=False),
                Column('description', NVARCHAR(200))
                Column('timestamp', TIMESTAMP, server_default=func.now())
            )

        Note that :meth:`.create_table` accepts :class:`~sqlalchemy.schema.Column`
        constructs directly from the SQLAlchemy library.  In particular,
        default values to be created on the database side are
        specified using the ``server_default`` parameter, and not
        ``default`` which only specifies Python-side defaults::

            from alembic import op
            from sqlalchemy import Column, TIMESTAMP, func

            # specify "DEFAULT NOW" along with the "timestamp" column
            op.create_table('account',
                Column('id', INTEGER, primary_key=True),
                Column('timestamp', TIMESTAMP, server_default=func.now())
            )

        :param name: Name of the table
        :param \*columns: collection of :class:`~sqlalchemy.schema.Column`
         objects within
         the table, as well as optional :class:`~sqlalchemy.schema.Constraint`
         objects
         and :class:`~.sqlalchemy.schema.Index` objects.
        :param schema: Optional schema name to operate within.
        :param \**kw: Other keyword arguments are passed to the underlying
         :class:`sqlalchemy.schema.Table` object created for the command.

        """
        self.impl.create_table(
            self._table(name, *columns, **kw)
        )