如何从MySql数据库读取Scrapy Start_urls？

如何解决如何从MySql数据库读取Scrapy Start_urls？

我正在尝试读写Mysql的所有输出。当我的蜘蛛开始抓取时，我想从MySQL数据库中获取所有URL，因此我尝试创建一个读取数据的函数。

readdata.py：

import mysql.connector
from mysql.connector import Error
from itemadapter import ItemAdapter

def dataReader(marketName):
    try:
        connection = mysql.connector.connect(host='localhost',database='test',user='root',port=3306,password='1234')
        sql_select_Query = "SELECT shop_URL FROM datatable.bot_markets WHERE shop_name='"+marketName+"';"
        cursor = connection.cursor()
        cursor.execute(sql_select_Query)
        records = cursor.fetchall()
        return records
    except Error as e:
        print("Error reading data from MySQL table",e)
    finally:
        if (connection.is_connected()):
            connection.close()
            cursor.close()
            print("MySQL connection is closed")

我想按如下方式从我的Spider调用此函数。

我的蜘蛛：

import scrapy
import re
import mysql.connector

from ..items import FirstBotItem
from scrapy.utils.project import get_project_settings
from first_bot.readdata import dataReader

class My_Spider(scrapy.Spider):
   name = "My_Spider"
   allowed_domains = ["quotes.toscrape.com/"]
   start_urls = dataReader(name)
   
   def parse(self,response):
       location = "quotes"
       for product in response.xpath('.//div[@class="product-card product-action "]'):
           
           product_link = response.url
           prices = product.xpath('.//div[@class="price-tag"]/span[@class="value"]/text()').get()
           if prices != None:prices = re.sub(r"[\s]","",prices)
           title = product.xpath('.//h5[@class="title product-card-title"]/a/text()').get()
           unit = product.xpath('.//div[@class="select single-select"]//i/text()').get()
           if unit != None: unit = re.sub(r"[\s]",unit)
           item = FirstBotItem()
           item['LOKASYON'] = location
           item['YEAR'] = 2020
           item['MONTH'] = 8
           yield item

我在使用start_urls时出错了，但是我不知道。我收到此错误。

_set_url
    raise TypeError('Request url must be str or unicode,got %s:' % type(url).__name__)
TypeError: Request url must be str or unicode,got tuple:
2020-08-24 15:46:31 [scrapy.core.engine] INFO: Closing spider (finished)

我的主要任务是从数据库中获取所有URL。因为有人会将URL写在同一网站上，所以Spider会自动抓取。

解决方法

您可以尝试通过以下方式更改dataReader方法中的逻辑：

    records = cursor.fetchall()
    return records

至：

records = cursor.fetchall()
records_list = []
for rec in records:
    records_list.append(rec)
return records_list

,

您应该在dataReader函数中写return list(records)而不是return records。