Question

我不知道如何访问存储在varchar类型列中的日期时间字符串我的烧瓶方法如下，从我执行mysql查询的地方开始

@app.route("/canopus_cycle", methods=['GET','POST'])
@is_logged_in
@is_attendence
@not_admin_logged_in
def canopus_cycles():
    if session['cycles'] == '1':
        import datetime as DT
        from datetime import datetime as dt
        today = DT.date.today()
        month = today - DT.timedelta(days=30)
        print("today = ", today)
        print("month = ", month)
        month = dt.strftime(month, "%Y-%m-%d %H:%M:%S")
        today = dt.strftime(today, "%Y-%m-%d %H:%M:%S")
        print("strf today = ", today)
        print("strf month = ", month)

        cur99 = connn2.cursor(dictionary=True)
        query = "SELECT * FROM custom_duty_mail WHERE STR_TO_DATE(add_time, '%Y-%m-%d %H:%i:%s') BETWEEN STR_TO_DATE('"+str(month)+"', '%Y-%m-%d %H:%i:%s') AND STR_TO_DATE('"+str(today)+"', '%Y-%m-%d %H:%i:%s')"
        print("query = ", query)
        cur99.execute(query)
        data2 = cur99.fetchall()
        print("data = ", data2)
    else:
        flash("SORRY YOU ARE NOT ALLOWED TO SEE THIS PAGE","danger")
        return redirect(url_for('dashboard'))

    return render_template('canopus_cycle.html', data2=data2)

我不知道我在查询中做什么错我将空设置为输出下面是我的输出屏幕

today =  2019-06-24
month =  2019-05-25
strf today =  2019-06-24 00:00:00
strf month =  2019-05-25 00:00:00
query =  SELECT * FROM custom_duty_mail WHERE STR_TO_DATE(add_time, '%Y-%m-%d %H:%i:%s') BETWEEN STR_TO_DATE('2019-05-25 00:00:00', '%Y-%m-%d %H:%i:%s') AND STR_TO_DATE('2019-06-24 00:00:00', '%Y-%m-%d %H:%i:%s')
data =  []

请指出一点以下是我对表格的描述

mysql> describe custom_duty_mail;
+-------------------+---------------+------+-----+---------+-------+
| Field             | Type          | Null | Key | Default | Extra |
+-------------------+---------------+------+-----+---------+-------+
| mode              | varchar(100)  | NO   |     | NULL    |       |
| inwd              | varchar(100)  | NO   |     | NULL    |       |
| etamail           | varchar(100)  | NO   |     | NULL    |       |
| inwdmail          | varchar(100)  | NO   |     | NULL    |       |
| add_time          | varchar(200)  | YES  |     | NULL    |       |
+-------------------+---------------+------+-----+---------+-------+
5 rows in set (0.00 sec)

不知道如何使用python flask访问存储在varchar列中的日期时间

0 个答案: