scrapy爬虫成长日记之将抓取内容写入mysql数据库

[root@bogon ~]# python
Python 2.7.10 (default, Jun  5 2015, 17:56:24) 
[GCC 4.4.4 20100726 (Red Hat 4.4.4-13)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import MySQLdb
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ImportError: No module named MySQLdb

[root@bogon ~]# pip install mysql-python
Collecting mysql-python
  Downloading MySQL-python-1.2.5.zip (108kB)
    100% |████████████████████████████████| 110kB 115kB/s 
Building wheels for collected packages: mysql-python
  Running setup.py bdist_wheel for mysql-python
  Stored in directory: /root/.cache/pip/wheels/8c/0d/11/d654cad764b92636ce047897dd2b9e1b0cd76c22f813c5851a
Successfully built mysql-python
Installing collected packages: mysql-python
Successfully installed mysql-python-1.2.5

yum install python-devel

CREATE DATABASE cnblogsdb DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci;
CREATE TABLE `cnblogsinfo` (
  `linkmd5id` char(32) NOT NULL COMMENT 'url md5编码id',
  `title` text COMMENT '标题',
  `description` text COMMENT '描述',
  `link` text  COMMENT 'url链接',
  `listUrl` text  COMMENT '分页url链接',
  `updated` datetime DEFAULT NULL  COMMENT '最后更新时间',
  PRIMARY KEY (`linkmd5id`)
) ENGINE=MyISAM DEFAULT CHARSET=utf8;

# start MySQL database configure setting
MYSQL_HOST = 'localhost'
MYSQL_DBNAME = 'cnblogsdb'
MYSQL_USER = 'root'
MYSQL_PASSWD = 'root'
# end of MySQL database configure setting

[root@bogon cnblogs]# more pipelines.py
# -*- coding: utf-8 -*-

# Define your item pipelines here
#
# Don't forget to add your pipeline to the ITEM_PIPELINES setting
# See: http://doc.scrapy.org/en/latest/topics/item-pipeline.html

from scrapy import signals
import json
import codecs
from twisted.enterprise import adbapi
from datetime import datetime
from hashlib import md5
import MySQLdb
import MySQLdb.cursors

class JsonWithEncodingCnblogsPipeline(object):
    def __init__(self):
        self.file = codecs.open('cnblogs.json', 'w', encoding='utf-8')
    def process_item(self, item, spider):
        line = json.dumps(dict(item), ensure_ascii=False) + "\n"
        self.file.write(line)
        return item
    def spider_closed(self, spider):
        self.file.close()

class MySQLStoreCnblogsPipeline(object):
    def __init__(self, dbpool):
        self.dbpool = dbpool
    
    @classmethod
    def from_settings(cls, settings):
        dbargs = dict(
            host=settings['MYSQL_HOST'],
            db=settings['MYSQL_DBNAME'],
            user=settings['MYSQL_USER'],
            passwd=settings['MYSQL_PASSWD'],
            charset='utf8',
            cursorclass = MySQLdb.cursors.DictCursor,
            use_unicode= True,
        )
        dbpool = adbapi.ConnectionPool('MySQLdb', **dbargs)
        return cls(dbpool)

    #pipeline默认调用
    def process_item(self, item, spider):
        d = self.dbpool.runInteraction(self._do_upinsert, item, spider)
        d.addErrback(self._handle_error, item, spider)
        d.addBoth(lambda _: item)
        return d
    #将每行更新或写入数据库中
    def _do_upinsert(self, conn, item, spider):
        linkmd5id = self._get_linkmd5id(item)
        #print linkmd5id
        now = datetime.utcnow().replace(microsecond=0).isoformat(' ')
        conn.execute("""
                select 1 from cnblogsinfo where linkmd5id = %s
        """, (linkmd5id, ))
        ret = conn.fetchone()

        if ret:
            conn.execute("""
                update cnblogsinfo set title = %s, description = %s, link = %s, listUrl = %s, updated = %s where linkmd5id = %s
            """, (item['title'], item['desc'], item['link'], item['listUrl'], now, linkmd5id))
            #print """
            #    update cnblogsinfo set title = %s, description = %s, link = %s, listUrl = %s, updated = %s where linkmd5id = %s
            #""", (item['title'], item['desc'], item['link'], item['listUrl'], now, linkmd5id)
        else:
            conn.execute("""
                insert into cnblogsinfo(linkmd5id, title, description, link, listUrl, updated) 
                values(%s, %s, %s, %s, %s, %s)
            """, (linkmd5id, item['title'], item['desc'], item['link'], item['listUrl'], now))
            #print """
            #    insert into cnblogsinfo(linkmd5id, title, description, link, listUrl, updated)
            #    values(%s, %s, %s, %s, %s, %s)
            #""", (linkmd5id, item['title'], item['desc'], item['link'], item['listUrl'], now)
    #获取url的md5编码
    def _get_linkmd5id(self, item):
        #url进行md5处理，为避免重复采集设计
        return md5(item['link']).hexdigest()
    #异常处理
    def _handle_error(self, failue, item, spider):
        log.err(failure)

ITEM_PIPELINES = {
    'cnblogs.pipelines.JsonWithEncodingCnblogsPipeline': 300,
    'cnblogs.pipelines.MySQLStoreCnblogsPipeline': 300,
}

[root@bogon cnblogs]# scrapy crawl CnblogsSpider