在django ORM中查询时如何将char转换为整数？ [英] How do i cast char to integer while querying in django ORM?

问题描述

最近开始使用Django ORM.I要执行此查询

Recently started using Django ORM.I want to execute this query

 select student_id from students where student_id like "%97318%" order by CAST(student_id as UNSIGNED) desc;   

其中student_id是一个CharField，我想要查询的整数。
我尝试使用

where student_id is a CharField which I want as integer for querying. I tried with

  students.objects.filter(student_id__contains "97318").order('-student_id')

工作正常。但是不知道如何将student_id转换为int，就像上面提到的Django ORM一样。应该使用原始查询还是有出路？
让我知道你的建议。

works fine. But don't know and couldn't find how to cast "student_id" to int like the actual MySQL query mentioned above with "Django ORM". should I use raw query or is there a way out? Let me know your suggestions.

推荐答案

使用queryset的 extra（）方法：

Use queryset's extra() method:

students.objects.filter(student_id__contains="97318") \
                .extra({'stident_id_uint': "CAST(student_id as UNSIGNED)"}) \
                .order_by('-student_id_uint')

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