SqlAlchemy:将datetime列转换为date列

Question

我正在尝试将datetime列转换为date

def filter_between_dates(query, req, db_col):
    date_from = req.get_param('date_from')
    #date_to = req.get_param('date_to')
    query = query.filter(cast(db_col,DATE) == date_from)
    return query

错误显示:"name 'DATE' is not defined"我试着加入import DATE，得到"ImportError:cannot import name 'DATE'"

也许我从一开始就做错了。请指导。

Answer 1

你必须导入它。

from sqlalchemy import Date, cast
...
def filter_between_dates(query, req, db_col):
    date_from = req.get_param('date_from')
    #date_to = req.get_param('date_to')
    query = query.filter(cast(db_col,Date) == date_from)
    return query

或者你可以用func:

from sqlalchemy import func
...
query = query.filter(func.date(db_col) == date_from)