日期超过一周的SQLite返回记录

Question

I am making a program for a book library and in the sqlite database there is a table for the books which includes the date that book was last taken out.

I need a query to show overdue books. My code so far follows:

def findOverdueBooks(event):
    findRecords = c.execute("SELECT * FROM bookList WHERE takenOut < 'now' ,  '-1 week' " )
    for row in findRecords:
        print(row)

I am getting this error when the code is run

line 31, in findOverdueBooks
findRecords = c.execute("SELECT * FROM bookList WHERE takenOut < 'now' ,  '-1 week' " )
sqlite3.OperationalError: near ",": syntax error

I don't understand why the comma is causing an error as that is how it is shown in the documentation .

Answer 1

Your datetime comparison is causing the issue here. It rather should be

AND takenOut < datetime('now', '-7 day')

See SQLite Date And Time Functions for more information

That should be a > comparison

AND takenOut > datetime('now', '-7 day')

You can as well try like below, if you are comparing with the date part only

WHERE DATE(takenOut) >= DATE('now', 'weekday 0', '-7 days')