'Returns the SQL literal of the cell as a string.
:param cell: The cell to insert into the table
:type cell: object
:param conn: The database connection
:type conn: connection object
:return: The serialized cell
:rtype: str'

@staticmethod
def _serialize_cell(cell, conn=None):

    if (cell is None):
        return None
    if isinstance(cell, datetime):
        return cell.isoformat()
    return str(cell)
