相关疑难解决方法(0)

我正在尝试将SQL转换为SQLAlchemy.我想要的查询的SQL版本如下:

SELECT * from calendarEventAttendee
JOIN calendarEventAttendanceActual ON calendarEventAttendanceActual.id = calendarEventAttendee.attendanceActualId
LEFT JOIN
   (SELECT bill.id, bill.personId, billToEvent.eventId FROM bill JOIN billToEvent ON bill.id = billToEvent.billId) b 
   ON b.eventId = calendarEventAttendee.eventId AND b.personId = calendarEventAttendee.personId
WHERE b.id is NULL

我的SQLAlchemy查询如下:

query = db.session.query(CalendarEventAttendee).join(CalendarEventAttendanceActual)

sub_query = db.session.query(Bill, BillToEvent).join(BillToEvent, BillToEvent.billId == Bill.id).subquery()
query = query.outerjoin(sub_query, and_(sub_query.Bill.personId == CalendarEventAttendee.personId, Bill.eventId == CalendarEventAttendee.eventId))
results = query.all()

我收到了一个错误 AttributeError: 'Alias' object has no attribute 'Bill'

如果我将SQLAlchemy查询调整为以下内容:

sub_query = db.session.query(Bill, BillToEvent).join(BillToEvent, BillToEvent.billId == Bill.id).subquery()
query = query.outerjoin(sub_query, …

我正在学习SQLAlchemy而且我被困住了.我有一个SQL表(table1)有两个字段:'name'和'other_names'

我有一个包含两列的excel文件:

first_name alias   
paul   patrick
john   joe
simon  simone
john   joey
john   jo

我想将excel文件读入我的table1,所以它看起来像这样(即同一行的所有别名都在一行):

paul    patrick
john    joe,joey,jo
simon   simone

这是我试图做的想法.我试过的代码(带注释):

for line in open('file.txt', 'r'): #for each line in the excel file
        line = line.strip().split('\t') #split each line with a name and alias
        first_name = line[0] #first name is the name before the tab
        alias = line[1] #alias is the name after the tab
        instance = 
        Session.query(session,tbs['table1'].name).filter_by(name=first_name) #look through the database table, by name field, and see if …