Question

我曾尝试从sqlalchemy会话文档中实现会话范围但由于某种原因我得到了一个属性错误：退出 at session_scope作为会话：

代码如下所示：

@contextmanager
def session_scope():
 """Provide a transactional scope around a series of operations."""
 session = Session()
 try:
     yield session
     session.commit()
 except:
     session.rollback()
     raise
 finally:
    session.close()



class SearchPhoneTable():
 def DateSearch(self,session,StartDate,EndDate):
    DateValue=[]
    OrderValue=[]
    SessionResult=session.query(VideoChange).filter(and_(VideoChange.Date <= EndDate, VideoChange.Date>=StartDate)).all()
    for elements in SessionResult:
        DateValue.append(elements.Date)
        OrderValue.append(elements.ViewsValue)
    return DateValue,OrderValue


def PDFOnline2(StartDate,EndDate):

 with session_scope as session:
  Xaxis,Yaxis=SearchPhoneTable().DateSearch(session,StartDate,EndDate)


 for elements in Yaxis:
    print(elements)

 for elements in Xaxis:
    print(elements)


 return 0

Answer 1

你非常接近，你只需要调用上下文管理器功能：

with session_scope() as session:

注意括号。

使用Sqlalchemy时，Session_scope引发属性错误

1 个答案: