我有一个拥有20年销售历史的房地产应用程序。我想将最近2年的列表放入一个将被主动查询的模型中,并将其他18年放入归档模型中。
我在Postgresql 9.5中使用Django 1.11
我有限的数据库管理知识告诉我这称为“水平分区”或“分片”。有没有一种聪明的方法在Django中设置它?或者我只是将相同的字段名称复制并粘贴到ListingActive
和ListingArchive
中?
class ListingActive(models.Model):
data1 = models.IntegerField()
data2 = models.CharField(max_length=10)
...
data100 = models.CharField(max_length=20)
class ListingArchived(models.Model):
same fields as ListingActive
后续问题。我想执行水平分区和垂直分区。
假设在每个Listing
模型中,总共有100个字段,但只有10个字段被主动查询。其他90个字段是从不查询的显示详细信息。
最后,我希望下面显示4个总模型。有没有办法使用抽象模型或其他方法来设置它?
class ListingActiveQuery(models.Model):
actively_queried_data_1 = models.IntegerField()
actively_queried_data_2 = models.IntegerField()
...
actively_queried_data_10 = models.IntegerField()
details = models.OneToOneField(ListingActiveDetails)
class ListingActiveDetails(models.Model):
data_1 = models.IntegerField()
data_2 = models.IntegerField()
...
data_90 = models.IntegerField()
class ListingArchivedQuery(models.Model):
actively_queried_data_1 = models.IntegerField()
actively_queried_data_2 = models.IntegerField()
...
actively_queried_data_10 = models.IntegerField()
details = models.OneToOneField(ListingArchivedDetails)
class ListingArchivedDetails(models.Model):
data_1 = models.IntegerField()
data_2 = models.IntegerField()
...
data_90 = models.IntegerField()
通常,您使用字段创建abstract model [Django-doc],然后将该抽象模型子类化为两个真实模型。例如:
class AbstractDataModel(models.Model):
data1 = models.IntegerField()
data2 = models.CharField(max_length=10)
# ...
data100 = models.CharField(max_length=20)
class Meta:
abstract = True
class ListingActive(AbstractDataModel):
pass
class ListingArchived(AbstractDataModel):
pass
编辑
class AbstractQuery(models.Model):
actively_queried_data_1 = models.IntegerField()
actively_queried_data_2 = models.IntegerField()
# ...
actively_queried_data_10 = models.IntegerField()
class Meta:
abstract = True
class AbstractDetails(models.Model):
data_1 = models.IntegerField()
data_2 = models.IntegerField()
# ...
data_90 = models.IntegerField()
class Meta:
abstract = True
class ListingActiveQuery(AbstractQuery):
details = models.OneToOneField(ListingActiveDetails)
class ListingActiveDetails(AbstractDetails):
pass
class ListingArchivedQuery(AbstractQuery):
details = models.OneToOneField(ListingArchivedDetails)
class ListingArchivedDetails(AbstractDetails):
pass