问题描述

我一直在反复在 SQLite3 中存储日期和时间，目的是稍后使用比较检索记录，例如SELECT * WHERE date1 <日期2

I have been going around and around with storing date and time in SQLite3 with the intention of retrieving the records using comparisons later e.g. SELECT * WHERE date1 < date2

我终于放弃了存储 datetime.datetime 对象的尝试，并决定使用 UNIX 时间戳，因为它们只是一个 int 且易于操作，但我仍然遇到错误.

I finally gave up trying to store datetime.datetime objects and decided to use a UNIX timestamp instead as they are just an int and easy to manipulate but I am still getting errors.

import sqlite3 as lite
import datetime
import time

conn = lite.connect('dispatcher.db')
cur = conn.cursor()
query = "create table if not exists new_test (curent_dt)"
cur.execute(query)
conn.commit()
now = datetime.datetime.now() - datetime.timedelta(minutes=60)
temp = int(time.mktime(now.timetuple()))
cur.execute('insert into new_test (curent_dt) values (? )', (temp))
conn.commit()
conn.close()

返回以下错误:

cur.execute('insert into new_test (curent_dt) values (? )', (temp))ValueError: 参数的类型不受支持

cur.execute('insert into new_test (curent_dt) values (? )', (temp)) ValueError: parameters are of unsupported type

在进一步调查问题后，我发现您必须使用尾随逗号来创建单个元素元组，例如(temp,)

After investigating the problem a little further I found that you have to use a trailing comma to create a single element tuple e.g. (temp,)

推荐答案

注意下面temp"后添加的逗号:

Note the added comma after "temp" below:

cur.execute('insert into new_test (curent_dt) values (?)', (temp,))

发生这种情况的原因是 (temp) 是一个整数，而 (temp,) 是一个包含 temp 的长度为 1 的元组.

The reason this happens is that (temp) is an integer but (temp,) is a tuple of length one containing temp.

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