Python + SQLite3 参数失败

Question

最后一个 cur.execute 语句中的参数无效。

下面的代码没有出错，但是 cur.fetchone() return 行值 (0,) 不应该出错

with conn:
    flag = 0
    today = (datetime.date.today() - datetime.timedelta(20)).strftime("%Y-%m-%d")
    prev_prev_day = (datetime.date.today() - datetime.timedelta(22)).strftime("%Y-%m-%d")
    cur = conn.cursor()
    cur.execute("SELECT EXISTS(SELECT user, COUNT(user) cnt FROM logins GROUP BY user HAVING cnt > 1)")
    if cur.fetchone()[0] == 1:
        flag + 1
        cur.execute("SELECT user, COUNT(user) cnt FROM logins GROUP BY user HAVING cnt > 1")
        for item in cur.fetchall():
            variables = (item[0], today, prev_prev_day,)
            # problem in with this statement
            cur.execute("SELECT COUNT(*) FROM logins WHERE user = ? AND seen_date BETWEEN ? AND ?", variables)
            print cur.fetchone()

我得到了正确的结果：

            cur.execute("SELECT COUNT(*) FROM logins WHERE user = ? AND seen_date BETWEEN '2015-07-11' AND '2015-07-13'", variables)

...只插入用户 = ?变量。

Answer 1

更新： 只需在参数之间切换即可。

这个：

variables = (item[0], today, prev_prev_day,)

应该是：

variables = (item[0], prev_prev_day, today)

Python + SQLite3 参数失败

Python + SQLite3 parameters failing

python

sqlite

parameters