ORM中自定义一个char类型字段

自定义一个char类型字段

class MyCharField(models.Field):
    """
    自定义的char类型的字段类
    """

    def __init__(self, max_length, *args, **kwargs):
        self.max_length = max_length
        super(MyCharField, self).__init__(max_length=max_length, *args, **kwargs)

    def db_type(self, connection):
        """
        限定生成数据库表的字段类型为char，长度为max_length指定的值
        """
        return 'char(%s)' % self.max_length

class Person(models.Model):
    name = models.CharField(max_length=24)
    age = models.IntegerField() # 最大10位
    # gender =
    birth = models.DateTimeField(auto_now_add=True)
phonenum = MyCharField(max_length=11)