pipeline的存储代码

在spider中最后一个函数返回item时会scrapy会调用pipeline里面的

process_item(self, item, spider):
函数并传入item，spider等参数
在这里可以将数据进行持久化储存
我的piple代码

# -*- coding: utf-8 -*-
# See: http://doc.scrapy.org/en/latest/topics/item-pipeline.html

import MySQLdb
import MySQLdb.cursors
from twisted.enterprise import adbapi

class MyPipeline(object):  ##这里的函数名于setting中的对应

    def __init__(self, dbpool):
        self.dbpool = dbpool
    @classmethod 　　 ##得到数据库的连接
    def from_settings(cls, settings):
        dbargs = dict(
                host = settings['MYSQL_HOST'],
                db = settings['MYSQL_DBNAME'],
                port = settings['MYSQL_PORT'],
                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)

    def process_item(self, item, spider): ##这个函数会在spider返回时调用
        d = self.dbpool.runInteraction(self._do_upinsert, item, spider)
        return item

    def _do_upinsert(self, conn, item, spider):
        valid = True
        for data in item:
            if not data:
                valid = False
        if valid: 　　　　　　　　##执行sql
            result = conn.execute(‘sql’)  
            if result:
                print 'added a record'
            else:
                print 'failed insert into table'

代码git地址：过几天会上传