如何在python中将qdatetime转换为sql datetime并从sql表中进行选择？

import pymysql
from PyQt5.QtCore import QDateTime

def convert_to_sql_datetime(qdatetime):
    sql_datetime = qdatetime.toString("yyyy-MM-dd hh:mm:ss")
    return sql_datetime

conn = pymysql.connect(host='localhost', user='username', password='password', database='database_name')
cursor = conn.cursor()

qdatetime = QDateTime.currentDateTime()  # 获取当前时间
sql_datetime = convert_to_sql_datetime(qdatetime)  # 将QDateTime转换为SQL datetime格式

# 编写SQL查询语句
sql = "SELECT * FROM table_name WHERE datetime_column >= %s"
params = (sql_datetime,)

# 执行查询
cursor.execute(sql, params)
result = cursor.fetchall()

# 打印查询结果
for row in result:
    print(row)

cursor.close()
conn.close()