#!/usr/bin/env python
#coding:utf-8

class Field(object):
    def __init__(self,name,column_type):
        self.name=name
        self.column_type=column_type

    def __str__(self):
        return "<%s:%s>" % (self.__class__.__name__,self.name)

class StringField(Field):
    def __init__(self, name):
        super(StringField, self).__init__(name, 'varchar(100)')


