Question

我想从指定的日期范围中获取行，但是当限制器为None（beg_date == None，fin_date == None）时，我想忽略一侧的范围。

例如：如果beg_date =='2019-10-23'和fin_date == None我想得到从2019-10-23至今的行。如何使用SQLAlchemy做到这一点？

型号：

class MyModel(Model):
    date = Column(Date)

代码：

beg_date = some_dict.get('beg_date')
fin_date = some_dict.get('fin_date')

session.query(MyModel).filter(MyModel.date.between(beg_date, find_date)

Answer 1

You could build your date condition with Python conditions on start_date and end_date before building your whole query:

if start_date and end_date:
    date_condition = MyModel.date.between(start_date, end_date)
elif start_date:
    date_condition = MyModel.date > start_date
elif end_date:
    date_condition = MyModel.date < end_date
else:
    date_condition = true()  # sqlalchemy.true()

session.query(MyModel).filter(date_condition)

I did not tested it but it should work with potential minor fixes.

SQLAlchemy在比较日期时忽略“无”

1 个答案: