App Engine GQL：查询日期范围

发布于 2024-08-06 02:19:00 字数 622 浏览 3 评论 0原文

此 Django 语句在 App Engine 中的等效项是什么？

return Post.objects.get(created_at__year=bits[0], 
                            created_at__month=bits[1], 
                            created_at__day=bits[2],
                            slug__iexact=bits[3])

我最终写了这个：

Post.gql('WHERE created_at > DATE(:1, :2, :3) AND created_at < DATE(:1, :2, :4) and slug = :5',
    int(bit[0]), int(bit[1]), int(bit[2]), int(bit[2]) + 1, bit[3])

但与 Django 相比，它非常可怕。还有其他更 Pythonic/Django 魔法的方式，例如使用 Post.filter() 或 created_at.day/month/year 属性吗？

原文

What would be the App Engine equivalent of this Django statement?

return Post.objects.get(created_at__year=bits[0], 
                            created_at__month=bits[1], 
                            created_at__day=bits[2],
                            slug__iexact=bits[3])

I've ended up writing this:

Post.gql('WHERE created_at > DATE(:1, :2, :3) AND created_at < DATE(:1, :2, :4) and slug = :5',
    int(bit[0]), int(bit[1]), int(bit[2]), int(bit[2]) + 1, bit[3])

But it's pretty horrific compared to Django. Any other more Pythonic/Django-magic way, e.g. with Post.filter() or created_at.day/month/year attributes?

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浪漫之都 2024-08-13 02:19:00

怎么样

from datetime import datetime, timedelta

created_start = datetime(year, month, day)
created_end = created_start + timedelta(days=1)
slug_value = 'my-slug-value'

posts = Post.all()
posts.filter('created_at >=', created_start)
posts.filter('created_at <', created_end)
posts.filter('slug =', slug_value)

# You can iterate over this query set just like a list
for post in posts:
    print post.key()

How about

from datetime import datetime, timedelta

created_start = datetime(year, month, day)
created_end = created_start + timedelta(days=1)
slug_value = 'my-slug-value'

posts = Post.all()
posts.filter('created_at >=', created_start)
posts.filter('created_at <', created_end)
posts.filter('slug =', slug_value)

# You can iterate over this query set just like a list
for post in posts:
    print post.key()

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划一舟意中人 2024-08-13 02:19:00

您不需要“relativedelta” - 您所描述的是 datetime.timedelta。否则，你的答案看起来不错。

就处理时间而言，App Engine 的优点在于几乎所有查询都具有相同的每个结果成本 - 并且所有查询都与返回的记录成比例缩放，而不是与数据存储总大小成比例。因此，您的解决方案工作正常。

或者，如果您需要一个不等式过滤器来处理其他事情，您可以添加一个“created_day”DateProperty，并对其进行简单的相等检查。

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昔日梦未散 2024-08-13 02:19:00

最终使用relativedelta库+以jQuery风格链接过滤器，虽然还不太Pythonic，但编写起来更舒适，也更干燥。 :) 仍然不确定这是否是最好的方法，因为它可能需要更多的数据库处理时间？

date = datetime(int(year), int(month), int(day))
... # then
queryset = Post.objects_published()
                            .filter('created_at >=', date)
                            .filter('created_at <', date + relativedelta(days=+1))
                            ...

并将 slug 传递给 object_detail 视图或另一个过滤器。

Ended up using the relativedelta library + chaining the filters in jQuery style, which although not too Pythonic yet, is a tad more comfortable to write and much DRYer. :) Still not sure if it's the best way to do it, as it'll probably require more database processing time?

date = datetime(int(year), int(month), int(day))
... # then
queryset = Post.objects_published()
                            .filter('created_at >=', date)
                            .filter('created_at <', date + relativedelta(days=+1))
                            ...

and passing slug to the object_detail view or yet another filter.

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