用pywebio搭建一个简单的web界面（小白自学中）

用pywebio搭建了一个简单web界面，展示的内容是一个表单，查询数据库中的数据进行展示，并进行编辑，对时间进行判断，如果时间存在显示该行参数修改，修改改行的数据；若果时间不存在选新增，将数据插入数据库的表中。

import cx_Oracle
from pywebio import start_server
from pywebio.input import *
from pywebio.output import *
from datetime import datetime

#标题 #可以控制字体大小


def connect_to_oracle():
    conn = cx_Oracle.connect(user='user', password='password', dsn='dsn')
    return conn

def query_data(conn):
    cursor = conn.cursor()
    cursor.execute('SELECT * FROM (SELECT * FROM t_test_c ORDER BY ID DESC) WHERE ROWNUM <= 5')
    data = cursor.fetchall()
    cursor.close()
    return data

def update_data(conn, row_id, new_values):
    cursor = conn.cursor()
    cursor.execute(
        'UPDATE t_test_c SET DOCTYPE=:DOCTYPE, NAME=:NAME, HARVEST=:HARVEST, STARTDATE=TO_DATE(:STARTDATE, \'YYYY-MM-DD HH24:MI:SS\'), RESERVED1C=:RESERVED1C, RESERVED2C=:RESERVED2C, RESERVED1N=:RESERVED1N, RESERVED2N=:RESERVED2N, RESERVED3N=:RESERVED3N WHERE ID=:ID',
         DOCTYPE = new_values['动火作业'], NAME = new_values['受限空间'], HARVEST = new_values['临时用电作业'],
         STARTDATE = new_values['日期'], RESERVED1C = new_values['盲板抽堵作业'], RESERVED2C = new_values['高空作业'],
         RESERVED1N = new_values['吊装作业'], RESERVED2N = new_values['动土作业'], RESERVED3N = new_values['断路