Question

我试图用sqlalchemy在两个日期之间进行搜索。如果我使用静态日期就会这样。

def secondExercise():
 for instance in session.query(Puppy.name, Puppy.weight, Puppy.dateOfBirth).\
    filter(Puppy.dateOfBirth <= '2015-08-31', Puppy.dateOfBirth >= '2015-02-25'     ).order_by(desc("dateOfBirth")):
 print instance

在python中操作日期非常简单。

today = date.today().strftime("%Y/%m/%d")
sixthmonth = date(date.today().year, date.today().month-6,date.today().day).strftime("%Y/%m/%d")

问题是，我不知道如何将其作为参数实现。对此有何帮助？

for instance in session.query(Puppy.name, Puppy.weight, Puppy.dateOfBirth).\
                  filter(Puppy.dateOfBirth <= today, Puppy.dateOfBirth >= sixthmonth ).order_by(desc("dateOfBirth")):

Answer 1

SQLAlchemy支持datetime.date（）和datetime.datetime（）对象的比较。 http://docs.sqlalchemy.org/en/rel_1_0/core/type_basics.html?highlight=datetime#sqlalchemy.types.DateTime

您可以将这些作为参数公开（将your_query替换为您希望保持恒定而不是参数化的所有内容）：

six_months_ago = datetime.datetime.today() - datetime.timedelta(180)
today = datetime.datetime.today()

def query_puppies(birth_date=six_months_ago):
    for puppy in your_query.filter(Puppy.dateOfBirth.between(birthdate, today)):
       print puppy.name # for example..

还要注意使用between子句的一些额外的超棒:) 但使用＆lt; =和＆gt; =的两个单独的clasuses也可以。

欢呼声

Sqlalchemy搜索日期

1 个答案: