python - 如何按月份名称查询sqlalchemy

Question

我试过了

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

但是我得到这个错误

(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.

并且正在保存日期 created_at = datetime.utcnow()

Answer 1

您想调用 PostgresSQL 函数 to_char , 而不是 Python datetime 函数 strftime:

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