python3計算自上次mysql數據輸入以來的分鍾數

Question

我有寫入 mysql 數據庫的 python3 程序，如果自上次輸入超過 15 分鍾，我希望 python3 程序發送警報。 問題是我不知道如何從 mysql 日期時間表條目中減去 python3 datetime.now()

謝謝

Answer 1

我對存儲在表中的日期時間有點不清楚，如果您以正確的格式存儲日期時間，那么正常的減法應該可以工作。

import datetime
import mysql.connector

mydb = mysql.connector.connect(
  host="localhost",
  user="dummyuser",    # Enter your username
  passwd="dummypass",  # Enter your password
  database="mydatebase"
)

mycursor = mydb.cursor()
mycursor.execute("SELECT date_time_column FROM mytable ORDER BY id DESC LIMIT 1;")
curr_date = datetime.datetime.now()
print("Current datetime Type:", type(curr_date))
print("Current datetime:", curr_date)


for x in mycursor:
    y = x[0]
    print("DB datetime Type", type(y))
    print("DB datetime", y)
    print("Difference between current time and DB time:", curr_date - y)

Output：

Current datetime Type: <class 'datetime.datetime'>
Current datetime: 2019-11-13 15:28:03.908454
DB datetime Type <class 'datetime.datetime'>
DB datetime 2019-10-27 15:07:04.378052
Difference between current time and DB time: 17 days, 0:20:59.530402