如何通過月份名稱

Question

查詢SQLAlchemy的我想這

db_session.query(PaymentsMade).filter(func.strftime('%B', PaymentsMade.created_at) == "August").all() 

，但我得到這個錯誤

(ProgrammingError) function strftime(unknown, timestamp without time zone) does not exist 
LINE 3: WHERE strftime('%B', paymentsmade.created_at) = 'August' 
     ^
HINT: No function matches the given name and argument types. You might need to add explicit type casts. 

和現在的儲蓄created_at = datetime.utcnow()

Answer 1

你要撥打的PostgreSQL的功能定位日期to_char ，而不是Python datetime函數strftime：

db_session.query(PaymentsMade) \ 
    .filter(func.to_char(PaymentsMade.created_at, "FMMonth") == "August")