scrapy 实现mysql 数据保存

开始用scrapy 爬取数据的时候  开始用同步操作始终会报1064  的错误  因为 mysql 语法和导入的字段不兼容

尝试了  n  次之后  开始用  异步爬取  虽然一路报错 但是还是能把数据保存到mysql 数据库里

 

关于spider:

# -*- coding: utf-8 -*-
import scrapy
from urllib import parse
import re
from copy import deepcopy
from ..items import MyspiderItem


class TbSpider(scrapy.Spider):
    name = 'tb'

    allowed_domains = []
    start_urls = ['http://tieba.baidu.com/mo/q----,sz@320_240-1-3---2/m?kw=%E6%A1%82%E6%9E%97%E7%94%B5%E5%AD%90%E7%A7%91%E6%8A%80%E5%A4%A7%E5%AD%A6%E5%8C%97%E6%B5%B7%E6%A0%A1%E5%8C%BA&pn=26140',
                  ]

    def parse(self, response):  # 总页面
        item = MyspiderItem()

        all_elements = response.xpath(".//div[@class='i']")
        # print(all_elements)

        for all_element in all_elements:
            content = all_element.xpath("./a/text()").extract_first()
            content = "".join(content.split())
            change = re.compile(r'[\d]+.')
            content = change.sub('', content)
            item['comment'] = content

            person = all_element.xpath("./p/text()").extract_first()
            person = "".join(person.split())
            # 去掉点赞数 评论数
            change2 = re.compile(r'点[\d]+回[\d]+')
            person = change2.sub('',person)
            # 选择日期
            change3 = re.compile(r'[\d]?[\d]?-[\d][\d](?=)')
            date = change3.findall(person)

            # 如果为今天则选择时间
            change4 = re.compile(r'[\d]?[\d]?:[\d][\d](?=)')
            time = change4.findall(person)

            person = change3.sub('',person)
            person = change4.sub('',person)

            if time ==[]:
                item['time'] = date
            else:
                item['time'] = time

            item['name'] = person

            # 增加密码 活跃
            item['is_active'] = '1'
            item['password'] = '123456'


            print(item)
            yield item



        # 下一页
        next_url ='http://tieba.baidu.com/mo/q----,sz@320_240-1-3---2/' + parse.unquote( response.xpath(".//div[@class='bc p']/a/@href").extract_first())

        print(next_url)
        yield  scrapy.Request(
            next_url,
            callback=self.parse,

        )

关于  item

# -*- coding: utf-8 -*-

# Define here the models for your scraped items
#
# See documentation in:
# https://doc.scrapy.org/en/latest/topics/items.html

import scrapy


class MyspiderItem(scrapy.Item):
    # define the fields for your item here like:
    # name = scrapy.Field()
    comment = scrapy.Field()
    time = scrapy.Field()
    name = scrapy.Field()
    password = scrapy.Field()
    is_active = scrapy.Field()

关于setting

# -*- coding: utf-8 -*-

# Scrapy settings for mySpider project
#
# For simplicity, this file contains only settings considered important or
# commonly used. You can find more settings consulting the documentation:
#
#     https://doc.scrapy.org/en/latest/topics/settings.html
#     https://doc.scrapy.org/en/latest/topics/downloader-middleware.html
#     https://doc.scrapy.org/en/latest/topics/spider-middleware.html

BOT_NAME = 'mySpider'

SPIDER_MODULES = ['mySpider.spiders']
NEWSPIDER_MODULE = 'mySpider.spiders'


# Crawl responsibly by identifying yourself (and your website) on the user-agent
USER_AGENT = 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.110 Safari/537.36'


MYSQL_HOST = 'localhost'
MYSQL_DBNAME = 'mu_ke'
MYSQL_USER = 'root'
MYSQL_PASSWD = 'root'



# Obey robots.txt rules
ROBOTSTXT_OBEY = False

# Configure maximum concurrent requests performed by Scrapy (default: 16)
#CONCURRENT_REQUESTS = 32

# Configure a delay for requests for the same website (default: 0)
# See https://doc.scrapy.org/en/latest/topics/settings.html#download-delay
# See also autothrottle settings and docs
#DOWNLOAD_DELAY = 3
# The download delay setting will honor only one of:
#CONCURRENT_REQUESTS_PER_DOMAIN = 16
#CONCURRENT_REQUESTS_PER_IP = 16

# Disable cookies (enabled by default)
#COOKIES_ENABLED = False

# Disable Telnet Console (enabled by default)
#TELNETCONSOLE_ENABLED = False

# Override the default request headers:
#DEFAULT_REQUEST_HEADERS = {
#   'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
#   'Accept-Language': 'en',
#}

# Enable or disable spider middlewares
# See https://doc.scrapy.org/en/latest/topics/spider-middleware.html
#SPIDER_MIDDLEWARES = {
#    'mySpider.middlewares.MyspiderSpiderMiddleware': 543,
#}

# Enable or disable downloader middlewares
# See https://doc.scrapy.org/en/latest/topics/downloader-middleware.html
#DOWNLOADER_MIDDLEWARES = {
#    'mySpider.middlewares.MyspiderDownloaderMiddleware': 543,
#}

# Enable or disable extensions
# See https://doc.scrapy.org/en/latest/topics/extensions.html
#EXTENSIONS = {
#    'scrapy.extensions.telnet.TelnetConsole': None,
#}

# Configure item pipelines
# See https://doc.scrapy.org/en/latest/topics/item-pipeline.html
ITEM_PIPELINES = {
   'mySpider.pipelines.MysqlPipelineTwo':200,

}


# Enable and configure the AutoThrottle extension (disabled by default)
# See https://doc.scrapy.org/en/latest/topics/autothrottle.html
#AUTOTHROTTLE_ENABLED = True
# The initial download delay
#AUTOTHROTTLE_START_DELAY = 5
# The maximum download delay to be set in case of high latencies
#AUTOTHROTTLE_MAX_DELAY = 60
# The average number of requests Scrapy should be sending in parallel to
# each remote server
#AUTOTHROTTLE_TARGET_CONCURRENCY = 1.0
# Enable showing throttling stats for every response received:
#AUTOTHROTTLE_DEBUG = False

# Enable and configure HTTP caching (disabled by default)
# See https://doc.scrapy.org/en/latest/topics/downloader-middleware.html#httpcache-middleware-settings
#HTTPCACHE_ENABLED = True
#HTTPCACHE_EXPIRATION_SECS = 0
#HTTPCACHE_DIR = 'httpcache'
#HTTPCACHE_IGNORE_HTTP_CODES = []
#HTTPCACHE_STORAGE = 'scrapy.extensions.httpcache.FilesystemCacheStorage'

关于  异步的爬取   重点

import pymysql
from twisted.enterprise import adbapi


class MysqlPipelineTwo(object):
    def __init__(self, dbpool):
        self.dbpool = dbpool

    @classmethod
    def from_settings(cls, settings):  # 函数名固定,会被scrapy调用,直接可用settings的值
        """
        数据库建立连接
        :param settings: 配置参数
        :return: 实例化参数
        """
        adbparams = dict(
            host='127.0.0.1',
            db='mu_ke',
            user='root',
            password='root',
            cursorclass=pymysql.cursors.DictCursor  # 指定cursor类型
        )
        # 连接数据池ConnectionPool,使用pymysql或者Mysqldb连接
        dbpool = adbapi.ConnectionPool('pymysql', **adbparams)
        # 返回实例化参数
        return cls(dbpool)

    def process_item(self, item, spider):
        """
        使用twisted将MySQL插入变成异步执行。通过连接池执行具体的sql操作,返回一个对象
        """
        query = self.dbpool.runInteraction(self.do_insert, item)  # 指定操作方法和操作数据
        # 添加异常处理
        query.addCallback(self.handle_error)  # 处理异常

    def do_insert(self, cursor, item):
        # 对数据库进行插入操作,并不需要commit,twisted会自动commit
        insert_sql = """
        insert into login_person(name,password,is_active,comment,time) VALUES(%s,%s,%s,%s,%s)
                    """
        cursor.execute(insert_sql, (item['name'], item['password'], item['is_active'], item['comment'],
                                    item['time']))

    def handle_error(self, failure):
        if failure:
            # 打印错误信息
            print(failure)

 

posted @ 2019-03-27 15:36  Mr喃先森  阅读(414)  评论(1编辑  收藏  举报