在sqlite中插入int时，参数不受支持 [英] parameter unsupported when inserting int in sqlite

问题描述

在SQLite3中存储日期和时间，我一直在四处走走，目的是通过比较来检索记录。 SELECT * WHERE date1< date2
我终于放弃了尝试存储datetime.datetime对象，并决定使用UNIX时间戳，因为它们只是一个int并且易于操作，但我仍然收到错误。

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 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: parameters are of unsupported type

在进一步调查问题后，我发现您必须使用一个尾部的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

请注意下面的temp之后添加的逗号：

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，但（temp，） 是一个长度为1的元组，包含 temp 。

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

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