来自 XML 的 Python 数据库更新仅更新最后一条记录

Question

我已经编写了一个脚本来更新我的 mysql 数据库中的库存，但是我只从更新的 xml 中获取了最后一条记录，我正在通过一个隧道寻找正确的知道并且喜欢有一双新的眼睛看着它。

import requests
import xml.etree.ElementTree as ET
from lxml import etree
from getpass import getpass
from mysql.connector import connect, Error
r = requests.get('http://api.edc.nl/xml/eg_xml_feed_stock.xml')

root = ET.fromstring(r.content)

for x in root.iter('product'):
    id = x.find('productid').text
    qty = x.find('qty').text


try:
    with connect(
        host="my host",
        user=input("Enter username: "),
        database="my database",
        password=getpass("Enter password: "),


    ) as connection:
        query = "UPDATE `ps_stock_available` SET `quantity` = " + \
            qty + " WHERE `id_product` = " + id + ";"
        with connection.cursor() as cursor:
            cursor.execute(query)
            connection.commit()
            #result = cursor.fetchall()
            # for row in result:
            print(query)
except Error as e:
    print(e)

Answer 1

更新表格的代码需要在for 循环内。否则它只会在循环完成后运行一次，并使用变量的最后一个值。

query = "UPDATE `ps_stock_available` SET `quantity` = %s WHERE `id_product` = %s"

try:
    with connect(
        host="my host",
        user=input("Enter username: "),
        database="my database",
        password=getpass("Enter password: "),
    ) as connection:
        with connection.cursor() as cursor:
            for x in root.iter('product'):
                prod_id = x.find('productid').text
                qty = x.find('qty').text
                cursor.execute(query, (qty, prod_id))
            connection.commit()
except Error as e:
    print(e)

不要将id用作变量，它是一个内置函数的名称。